Add Diagnostics tab to developer settings with async probes.

Split settings into Settings and Diagnostics tabs; run background read-only tests for codecs, camera/audio modes, network reachability, and casting/display extras. DevDiagnosticsReport.toJson() prepares future BE upload.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/src/main/java/com/foxx/androidcast/DeveloperSettingsActivity.java

@@ -35,11 +35,16 @@ import com.foxx.androidcast.receiver.av.ReceiverAudioPreset;
 import com.foxx.androidcast.receiver.av.ReceiverAvRuntime;
 import com.foxx.androidcast.receiver.av.ReceiverVideoPreset;
 import com.foxx.androidcast.sender.SenderResolutionUiMode;
+import com.foxx.androidcast.dev.DevDiagnosticsController;
 import com.foxx.androidcast.stats.ui.SessionStatsAnalyzerActivity;
+import com.google.android.material.tabs.TabLayout;
 import com.google.android.material.textfield.TextInputEditText;
 
 /** Hidden developer settings (opened via app-info area easter egg). */
 public class DeveloperSettingsActivity extends AppCompatActivity {
+    private DevDiagnosticsController diagnosticsController;
+    private android.view.View settingsPanel;
+    private android.view.View diagnosticsPanel;
     private Spinner videoPresetSpinner;
     private Spinner audioPresetSpinner;
     private SeekBar intensitySeek;
@@ -57,6 +62,11 @@ public class DeveloperSettingsActivity extends AppCompatActivity {
         setContentView(R.layout.activity_developer_settings);
         setTitle(R.string.developer_settings_title);
 
+        settingsPanel = findViewById(R.id.dev_panel_settings);
+        diagnosticsPanel = findViewById(R.id.dev_panel_diagnostics);
+        diagnosticsController = new DevDiagnosticsController(this);
+        bindDeveloperTabs();
+
         CheckBox debugOverlay = findViewById(R.id.check_receiver_debug_overlay);
         CheckBox codecScores = findViewById(R.id.check_show_codec_priority_scores);
         CheckBox sessionStats = findViewById(R.id.check_grab_session_stats);
@@ -94,6 +104,14 @@ public class DeveloperSettingsActivity extends AppCompatActivity {
         bindCommercialSection();
     }
 
+    @Override
+    protected void onDestroy() {
+        if (diagnosticsController != null) {
+            diagnosticsController.onDestroy();
+        }
+        super.onDestroy();
+    }
+
     @Override
     protected void onPause() {
         saveAvPresets();
@@ -378,6 +396,36 @@ public class DeveloperSettingsActivity extends AppCompatActivity {
         void write(Context context, boolean value);
     }
 
+    private void bindDeveloperTabs() {
+        TabLayout tabs = findViewById(R.id.dev_settings_tabs);
+        if (tabs == null) {
+            return;
+        }
+        tabs.addTab(tabs.newTab().setText(R.string.dev_tab_settings));
+        tabs.addTab(tabs.newTab().setText(R.string.dev_tab_diagnostics));
+        tabs.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
+            @Override
+            public void onTabSelected(TabLayout.Tab tab) {
+                boolean diagnostics = tab.getPosition() == 1;
+                settingsPanel.setVisibility(diagnostics ? android.view.View.GONE : android.view.View.VISIBLE);
+                diagnosticsPanel.setVisibility(diagnostics ? android.view.View.VISIBLE : android.view.View.GONE);
+                if (diagnostics) {
+                    diagnosticsController.onDiagnosticsTabShown();
+                }
+            }
+
+            @Override
+            public void onTabUnselected(TabLayout.Tab tab) {}
+
+            @Override
+            public void onTabReselected(TabLayout.Tab tab) {
+                if (tab.getPosition() == 1) {
+                    diagnosticsController.onDiagnosticsTabShown();
+                }
+            }
+        });
+    }
+
     private void bindDeveloperCheckbox(CheckBox box, boolean checked, BoolPrefWriter writer) {
         if (box == null) {
             return;

app/src/main/java/com/foxx/androidcast/dev/DevDiagnosticsController.java

@@ -0,0 +1,173 @@
+package com.foxx.androidcast.dev;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.view.View;
+import android.widget.Button;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.foxx.androidcast.R;
+
+import java.util.LinkedHashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/** Runs async diagnostics and binds results to the Diagnostics tab cards. */
+public final class DevDiagnosticsController {
+    public enum Section {
+        HW(R.id.dev_diag_hw, R.string.dev_diag_hw_title),
+        CAMERA(R.id.dev_diag_camera, R.string.dev_diag_camera_title),
+        AUDIO(R.id.dev_diag_audio, R.string.dev_diag_audio_title),
+        NETWORK(R.id.dev_diag_network, R.string.dev_diag_network_title),
+        CASTING(R.id.dev_diag_casting, R.string.dev_diag_casting_title);
+
+        final int includeId;
+        final int titleRes;
+
+        Section(int includeId, int titleRes) {
+            this.includeId = includeId;
+            this.titleRes = titleRes;
+        }
+    }
+
+    private final AppCompatActivity activity;
+    private final View diagnosticsRoot;
+    private final Map<Section, CardViews> cards = new LinkedHashMap<>();
+    private final ExecutorService executor = Executors.newSingleThreadExecutor();
+    private final Handler main = new Handler(Looper.getMainLooper());
+    private final AtomicBoolean cancel = new AtomicBoolean(false);
+    private final AtomicBoolean running = new AtomicBoolean(false);
+
+    private DevDiagnosticsReport lastReport;
+
+    public DevDiagnosticsController(AppCompatActivity activity) {
+        this.activity = activity;
+        this.diagnosticsRoot = activity.findViewById(R.id.dev_panel_diagnostics);
+        for (Section s : Section.values()) {
+            View cardRoot = diagnosticsRoot.findViewById(s.includeId);
+            TextView title = cardRoot.findViewById(R.id.dev_diag_card_title);
+            TextView body = cardRoot.findViewById(R.id.dev_diag_card_body);
+            ProgressBar spinner = cardRoot.findViewById(R.id.dev_diag_card_spinner);
+            title.setText(activity.getString(s.titleRes));
+            body.setText(R.string.dev_diag_pending);
+            cards.put(s, new CardViews(activity, body, spinner));
+        }
+        Button stop = diagnosticsRoot.findViewById(R.id.btn_dev_diag_stop);
+        stop.setOnClickListener(v -> stopTests());
+    }
+
+    public void onDiagnosticsTabShown() {
+        if (!running.get()) {
+            startTests();
+        }
+    }
+
+    public void onDestroy() {
+        cancel.set(true);
+        executor.shutdownNow();
+    }
+
+    public void stopTests() {
+        cancel.set(true);
+    }
+
+    /** Last completed report (for future BE upload). */
+    public DevDiagnosticsReport getLastReport() {
+        return lastReport;
+    }
+
+    private void startTests() {
+        cancel.set(false);
+        running.set(true);
+        for (CardViews c : cards.values()) {
+            c.showRunning();
+        }
+        executor.execute(this::runSuite);
+    }
+
+    private void runSuite() {
+        Map<String, String> sectionText = new LinkedHashMap<>();
+        try {
+            runSection(Section.HW, () ->
+                    DevDiagnosticsProbe.probeHardwareAcceleration(activity), sectionText);
+            runSection(Section.CAMERA, () ->
+                    DevDiagnosticsProbe.probeCameraCapture(activity), sectionText);
+            runSection(Section.AUDIO, () ->
+                    DevDiagnosticsProbe.probeAudioCapture(activity), sectionText);
+            runSection(Section.NETWORK, () ->
+                    DevDiagnosticsProbe.probeNetwork(activity, cancel), sectionText);
+            runSection(Section.CASTING, () ->
+                    DevDiagnosticsProbe.probeCastingExtras(activity), sectionText);
+        } finally {
+            if (!cancel.get()) {
+                lastReport = new DevDiagnosticsReport(System.currentTimeMillis(), sectionText);
+            }
+            main.post(() -> {
+                running.set(false);
+                if (cancel.get()) {
+                    for (CardViews c : cards.values()) {
+                        c.showStopped();
+                    }
+                }
+            });
+        }
+    }
+
+    private void runSection(Section section, Probe probe, Map<String, String> out) {
+        if (cancel.get()) {
+            main.post(() -> cards.get(section).showStopped());
+            return;
+        }
+        main.post(() -> cards.get(section).showRunning());
+        String text;
+        try {
+            text = probe.run();
+        } catch (Exception e) {
+            text = "Error: " + e.getMessage();
+        }
+        if (cancel.get()) {
+            main.post(() -> cards.get(section).showStopped());
+            return;
+        }
+        out.put(section.name().toLowerCase(Locale.ROOT), text);
+        String finalText = text;
+        main.post(() -> cards.get(section).showResult(finalText));
+    }
+
+    private interface Probe {
+        String run();
+    }
+
+    private static final class CardViews {
+        private final AppCompatActivity activity;
+        private final TextView body;
+        private final ProgressBar spinner;
+
+        CardViews(AppCompatActivity activity, TextView body, ProgressBar spinner) {
+            this.activity = activity;
+            this.body = body;
+            this.spinner = spinner;
+        }
+
+        void showRunning() {
+            spinner.setVisibility(View.VISIBLE);
+            body.setText(activity.getString(R.string.dev_diag_running));
+        }
+
+        void showResult(String text) {
+            spinner.setVisibility(View.GONE);
+            body.setText(text);
+        }
+
+        void showStopped() {
+            spinner.setVisibility(View.GONE);
+            body.setText(activity.getString(R.string.dev_diag_stopped));
+        }
+    }
+}

app/src/main/java/com/foxx/androidcast/dev/DevDiagnosticsProbe.java

@@ -0,0 +1,317 @@
+package com.foxx.androidcast.dev;
+
+import android.Manifest;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.media.MediaCodecInfo;
+import android.media.MediaCodecList;
+import android.media.MediaFormat;
+import android.net.ConnectivityManager;
+import android.net.NetworkCapabilities;
+import android.net.Uri;
+import android.os.Build;
+import android.util.Size;
+
+import androidx.core.content.ContextCompat;
+
+import com.foxx.androidcast.AppPreferences;
+import com.foxx.androidcast.BuildConfig;
+import com.foxx.androidcast.PlatformCastSupport;
+import com.foxx.androidcast.crash.CrashSettingsStore;
+import com.foxx.androidcast.display.WiredDisplayMonitor;
+import com.foxx.androidcast.media.codec.jni.NativeCodecBridge;
+import com.foxx.androidcast.sender.CodecCatalog;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.InetAddress;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/** Read-only device probes for developer diagnostics (no user interaction). */
+public final class DevDiagnosticsProbe {
+    private static final int HTTP_TIMEOUT_MS = 6_000;
+
+    private DevDiagnosticsProbe() {}
+
+    public static String probeHardwareAcceleration(Context context) {
+        CodecCatalog.invalidateCapabilities();
+        StringBuilder sb = new StringBuilder();
+        sb.append("API ").append(Build.VERSION.SDK_INT).append('\n');
+        sb.append("libvpx JNI: ").append(NativeCodecBridge.isLibvpxAvailable() ? "yes" : "no").append('\n');
+        sb.append('\n').append("Video encoders:\n");
+        appendVideoCodecLines(sb, true);
+        sb.append('\n').append("Video decoders:\n");
+        appendVideoCodecLines(sb, false);
+        sb.append('\n').append("MIME summary (catalog):\n");
+        sb.append("  advertised enc: ").append(join(CodecCatalog.localEncoderMimes())).append('\n');
+        sb.append("  advertised dec: ").append(join(CodecCatalog.localDecoderMimes()));
+        return sb.toString().trim();
+    }
+
+    public static String probeCameraCapture(Context context) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("Camera2 capture modes (cast settings):\n");
+        List<String> modes = new ArrayList<>();
+        modes.add(context.getString(com.foxx.androidcast.R.string.capture_full_screen));
+        if (PlatformCastSupport.isCaptureUserChoiceSupported()) {
+            modes.add(context.getString(com.foxx.androidcast.R.string.capture_user_choice));
+        } else {
+            modes.add(context.getString(com.foxx.androidcast.R.string.capture_user_choice_unavailable,
+                    Build.VERSION.SDK_INT));
+        }
+        if (PlatformCastSupport.isCameraCaptureModeSupported()) {
+            modes.add(context.getString(com.foxx.androidcast.R.string.capture_camera_rear));
+            if (PlatformCastSupport.hasFrontCamera(context)) {
+                modes.add(context.getString(com.foxx.androidcast.R.string.capture_camera_front));
+            }
+        } else {
+            modes.add(context.getString(com.foxx.androidcast.R.string.capture_camera_unavailable));
+        }
+        modes.add(context.getString(com.foxx.androidcast.R.string.capture_calibration_test));
+        for (String m : modes) {
+            sb.append("  • ").append(m).append('\n');
+        }
+        sb.append('\n').append("Physical cameras:\n");
+        appendCameraDevices(context, sb);
+        return sb.toString().trim();
+    }
+
+    public static String probeAudioCapture(Context context) {
+        StringBuilder sb = new StringBuilder();
+        boolean api = PlatformCastSupport.isAudioCaptureSupported();
+        sb.append("Playback capture (MediaProjection): ")
+                .append(api ? "supported (API 29+)" : "unavailable").append('\n');
+        boolean micPerm = ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO)
+                == PackageManager.PERMISSION_GRANTED;
+        sb.append("RECORD_AUDIO granted: ").append(micPerm ? "yes" : "no").append('\n');
+        sb.append('\n').append("Runtime modes (AudioCapture):\n");
+        if (!api) {
+            sb.append("  • (none — API < 29)\n");
+        } else {
+            sb.append("  • playback\n");
+            sb.append("  • playback+mic (when mic available)\n");
+            sb.append("  • mic (calibration / no projection)\n");
+        }
+        sb.append('\n').append("Voice codecs (settings):\n");
+        for (CodecCatalog.AudioCodecChoice c : CodecCatalog.audioCodecChoicesForUi()) {
+            sb.append("  • ").append(c.codec.name())
+                    .append(c.selectable ? "" : " (N/A)")
+                    .append('\n');
+        }
+        return sb.toString().trim();
+    }
+
+    public static String probeNetwork(Context context, AtomicBoolean cancel) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(connectivitySummary(context)).append('\n');
+        String crashUrl = resolveCrashUploadUrl(context);
+        sb.append('\n').append(probeHttp("Crash upload", crashUrl, cancel)).append('\n');
+        String otaUrl = resolveOtaUrl(context);
+        if (!otaUrl.isEmpty()) {
+            sb.append('\n').append(probeHttp("OTA channel", otaUrl, cancel));
+        }
+        return sb.toString().trim();
+    }
+
+    public static String probeCastingExtras(Context context) {
+        StringBuilder sb = new StringBuilder();
+        PackageManager pm = context.getPackageManager();
+        sb.append("Wi‑Fi Direct (OS): ")
+                .append(pm.hasSystemFeature(PackageManager.FEATURE_WIFI_DIRECT) ? "yes" : "no")
+                .append('\n');
+        sb.append("Miracast / Wi‑Fi Display: ")
+                .append(miracastSummary(pm))
+                .append(" (in-app cast uses MediaProjection, not WFD)\n");
+        WiredDisplayMonitor monitor = WiredDisplayMonitor.getInstance(context);
+        monitor.ensureRegistered();
+        sb.append('\n').append("HDMI / external display:\n  ")
+                .append(monitor.getSummaryLine().replace("\n", "\n  "))
+                .append('\n');
+        sb.append('\n').append("MediaProjection screen capture: ")
+                .append(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? "available" : "N/A")
+                .append('\n');
+        sb.append("App/screen picker (API 34+): ")
+                .append(PlatformCastSupport.isCaptureUserChoiceSupported() ? "yes" : "no")
+                .append('\n');
+        sb.append("Google Cast resolver: ")
+                .append(resolveCastIntent(pm) ? "activity found" : "none")
+                .append('\n');
+        sb.append("Nearby / Share resolver: ")
+                .append(resolveNearbyShare(pm) ? "activity found" : "none");
+        return sb.toString().trim();
+    }
+
+    private static void appendVideoCodecLines(StringBuilder sb, boolean encoder) {
+        List<String> lines = new ArrayList<>();
+        MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
+        for (MediaCodecInfo info : list.getCodecInfos()) {
+            if (info.isEncoder() != encoder) {
+                continue;
+            }
+            boolean hw = Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && info.isHardwareAccelerated();
+            for (String type : info.getSupportedTypes()) {
+                if (type == null || !type.startsWith("video/")) {
+                    continue;
+                }
+                lines.add(String.format(Locale.US, "  %s [%s] %s", type, hw ? "HW" : "SW", info.getName()));
+            }
+        }
+        if (lines.isEmpty()) {
+            sb.append("  (none)\n");
+            return;
+        }
+        for (String line : lines) {
+            sb.append(line).append('\n');
+        }
+    }
+
+    private static void appendCameraDevices(Context context, StringBuilder sb) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            sb.append("  (Camera2 modes need API 29+)\n");
+            return;
+        }
+        try {
+            CameraManager mgr = context.getSystemService(CameraManager.class);
+            if (mgr == null) {
+                sb.append("  (no CameraManager)\n");
+                return;
+            }
+            for (String id : mgr.getCameraIdList()) {
+                CameraCharacteristics ch = mgr.getCameraCharacteristics(id);
+                Integer facing = ch.get(CameraCharacteristics.LENS_FACING);
+                String facingStr = facing == null ? "?" :
+                        facing == CameraCharacteristics.LENS_FACING_FRONT ? "front" :
+                                facing == CameraCharacteristics.LENS_FACING_BACK ? "back" : "other";
+                StreamConfigurationMap map = ch.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+                int outputs = 0;
+                if (map != null) {
+                    Size[] sizes = map.getOutputSizes(android.graphics.ImageFormat.YUV_420_888);
+                    outputs = sizes != null ? sizes.length : 0;
+                }
+                sb.append("  • id=").append(id)
+                        .append(" ").append(facingStr)
+                        .append(", YUV outputs=").append(outputs)
+                        .append('\n');
+            }
+        } catch (CameraAccessException | SecurityException e) {
+            sb.append("  Error: ").append(e.getMessage()).append('\n');
+        }
+    }
+
+    private static String connectivitySummary(Context context) {
+        ConnectivityManager cm = context.getSystemService(ConnectivityManager.class);
+        if (cm == null) {
+            return "Connectivity: unknown";
+        }
+        android.net.Network net = cm.getActiveNetwork();
+        if (net == null) {
+            return "Connectivity: no active network";
+        }
+        NetworkCapabilities caps = cm.getNetworkCapabilities(net);
+        if (caps == null) {
+            return "Connectivity: active network (no caps)";
+        }
+        List<String> parts = new ArrayList<>();
+        if (caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
+            parts.add("Wi‑Fi");
+        }
+        if (caps.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
+            parts.add("cellular");
+        }
+        if (caps.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)) {
+            parts.add("ethernet");
+        }
+        if (caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)) {
+            parts.add("internet");
+        }
+        return "Connectivity: " + (parts.isEmpty() ? "other" : String.join(", ", parts));
+    }
+
+    private static String probeHttp(String label, String url, AtomicBoolean cancel) {
+        if (cancel != null && cancel.get()) {
+            return label + ": stopped";
+        }
+        if (url == null || url.trim().isEmpty()) {
+            return label + ": (no URL configured)";
+        }
+        String trimmed = url.trim();
+        long t0 = System.currentTimeMillis();
+        try {
+            String host = Uri.parse(trimmed).getHost();
+            if (host != null && !host.isEmpty()) {
+                InetAddress addr = InetAddress.getByName(host);
+                long dnsMs = System.currentTimeMillis() - t0;
+                if (cancel != null && cancel.get()) {
+                    return label + ": stopped";
+                }
+                HttpURLConnection conn = (HttpURLConnection) new URL(trimmed).openConnection();
+                conn.setConnectTimeout(HTTP_TIMEOUT_MS);
+                conn.setReadTimeout(HTTP_TIMEOUT_MS);
+                conn.setRequestMethod("HEAD");
+                conn.setInstanceFollowRedirects(true);
+                int code = conn.getResponseCode();
+                long totalMs = System.currentTimeMillis() - t0;
+                conn.disconnect();
+                return label + ": HTTP " + code + ", DNS " + dnsMs + " ms, total " + totalMs + " ms"
+                        + " (" + addr.getHostAddress() + ")";
+            }
+            return label + ": invalid URL";
+        } catch (IOException e) {
+            return label + ": fail — " + e.getClass().getSimpleName() + ": " + e.getMessage()
+                    + " (" + (System.currentTimeMillis() - t0) + " ms)";
+        }
+    }
+
+    private static String resolveCrashUploadUrl(Context context) {
+        return CrashSettingsStore.load(context).uploadUrl;
+    }
+
+    private static String resolveOtaUrl(Context context) {
+        String url = AppPreferences.getOtaChannelUrl(context);
+        if (url.isEmpty() && BuildConfig.OTA_CHANNEL_URL_DEFAULT != null) {
+            url = BuildConfig.OTA_CHANNEL_URL_DEFAULT.trim();
+        }
+        return url;
+    }
+
+    private static String miracastSummary(PackageManager pm) {
+        if (pm.hasSystemFeature(PackageManager.FEATURE_WIFI_DIRECT)) {
+            return "likely via OS Wi‑Fi Display stack";
+        }
+        return "not reported";
+    }
+
+    private static boolean resolveCastIntent(PackageManager pm) {
+        Intent i = new Intent("android.settings.CAST_SETTINGS");
+        return i.resolveActivity(pm) != null;
+    }
+
+    private static boolean resolveNearbyShare(PackageManager pm) {
+        Intent i = new Intent(Intent.ACTION_SEND);
+        i.setType("video/*");
+        return i.resolveActivity(pm) != null;
+    }
+
+    private static String join(List<String> list) {
+        if (list == null || list.isEmpty()) {
+            return "(none)";
+        }
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < list.size(); i++) {
+            if (i > 0) {
+                sb.append(", ");
+            }
+            sb.append(list.get(i));
+        }
+        return sb.toString();
+    }
+}

app/src/main/java/com/foxx/androidcast/dev/DevDiagnosticsReport.java

@@ -0,0 +1,60 @@
+package com.foxx.androidcast.dev;
+
+import android.os.Build;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * In-memory diagnostics snapshot for developer settings.
+ * {@link #toJson()} is ready for a future BE upload endpoint (not wired yet).
+ */
+public final class DevDiagnosticsReport {
+    public final long collectedAtEpochMs;
+    public final String deviceModel;
+    public final int sdkInt;
+    public final Map<String, String> sections;
+
+    public DevDiagnosticsReport(long collectedAtEpochMs, Map<String, String> sections) {
+        this.collectedAtEpochMs = collectedAtEpochMs;
+        this.deviceModel = Build.MANUFACTURER + " " + Build.MODEL;
+        this.sdkInt = Build.VERSION.SDK_INT;
+        this.sections = new LinkedHashMap<>(sections);
+    }
+
+    public JSONObject toJson() {
+        JSONObject root = new JSONObject();
+        try {
+            root.put("schema_version", 1);
+            root.put("kind", "dev_diagnostics");
+            root.put("collected_at_ms", collectedAtEpochMs);
+            root.put("device_model", deviceModel);
+            root.put("sdk_int", sdkInt);
+            JSONObject body = new JSONObject();
+            for (Map.Entry<String, String> e : sections.entrySet()) {
+                body.put(e.getKey(), e.getValue());
+            }
+            root.put("sections", body);
+            root.put("sections_array", sectionsToArray());
+        } catch (Exception ignored) {
+        }
+        return root;
+    }
+
+    private JSONArray sectionsToArray() {
+        JSONArray arr = new JSONArray();
+        for (Map.Entry<String, String> e : sections.entrySet()) {
+            JSONObject item = new JSONObject();
+            try {
+                item.put("id", e.getKey());
+                item.put("text", e.getValue());
+                arr.put(item);
+            } catch (Exception ignored) {
+            }
+        }
+        return arr;
+    }
+}

app/src/main/res/layout/activity_dev_diagnostics_panel.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/dev_diag_intro"
+        android:textSize="13sp" />
+
+    <Button
+        android:id="@+id/btn_dev_diag_stop"
+        style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="@string/dev_diag_stop" />
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_marginTop="8dp"
+        android:layout_weight="1"
+        android:fillViewport="true">
+
+        <LinearLayout
+            android:id="@+id/dev_diag_cards"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:paddingBottom="16dp">
+
+            <include
+                android:id="@+id/dev_diag_hw"
+                layout="@layout/view_dev_diag_card" />
+
+            <include
+                android:id="@+id/dev_diag_camera"
+                layout="@layout/view_dev_diag_card" />
+
+            <include
+                android:id="@+id/dev_diag_audio"
+                layout="@layout/view_dev_diag_card" />
+
+            <include
+                android:id="@+id/dev_diag_network"
+                layout="@layout/view_dev_diag_card" />
+
+            <include
+                android:id="@+id/dev_diag_casting"
+                layout="@layout/view_dev_diag_card" />
+        </LinearLayout>
+    </ScrollView>
+</LinearLayout>

app/src/main/res/layout/activity_dev_settings_panel.xml

@@ -0,0 +1,315 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="true">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="24dp">
+
+        <CheckBox
+            android:id="@+id/check_receiver_debug_overlay"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/dev_show_receiver_debug_overlay" />
+
+        <CheckBox
+            android:id="@+id/check_show_codec_priority_scores"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_show_codec_priority_scores" />
+
+        <CheckBox
+            android:id="@+id/check_grab_session_stats"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_grab_session_stats" />
+
+        <CheckBox
+            android:id="@+id/check_receiver_adaptive_display"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_receiver_adaptive_display" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="28dp"
+            android:text="@string/dev_sender_resolution_ui_section"
+            android:textSize="16sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_sender_resolution_ui_mode"
+            android:textSize="14sp" />
+
+        <Spinner
+            android:id="@+id/spinner_dev_sender_resolution_ui_mode"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_sender_resolution_ui_hint"
+            android:textSize="12sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="28dp"
+            android:text="@string/dev_av_presets_section"
+            android:textSize="16sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_av_video_preset"
+            android:textSize="14sp" />
+
+        <Spinner
+            android:id="@+id/spinner_dev_video_preset"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_av_audio_preset"
+            android:textSize="14sp" />
+
+        <Spinner
+            android:id="@+id/spinner_dev_audio_preset"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp" />
+
+        <TextView
+            android:id="@+id/label_dev_av_intensity"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_av_intensity"
+            android:textSize="14sp" />
+
+        <SeekBar
+            android:id="@+id/seek_dev_av_intensity"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp"
+            android:max="10"
+            android:progress="5" />
+
+        <TextView
+            android:id="@+id/text_dev_av_intensity_value"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textSize="12sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_av_presets_hint"
+            android:textSize="12sp" />
+
+        <Button
+            android:id="@+id/btn_open_session_stats"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:text="@string/session_stats_open" />
+
+        <Button
+            android:id="@+id/btn_reload_codecs_json"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_reload_codecs_json" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_reload_codecs_json_hint"
+            android:textSize="12sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="28dp"
+            android:text="@string/ota_section_title"
+            android:textSize="16sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/text_ota_installed_version"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:textSize="13sp" />
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:hint="@string/ota_manifest_url_hint">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/edit_ota_manifest_url"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="textUri" />
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <CheckBox
+            android:id="@+id/check_ota_on_launch"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:checked="true"
+            android:text="@string/ota_check_on_launch" />
+
+        <Button
+            android:id="@+id/btn_check_ota"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/ota_check_now" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/ota_section_hint"
+            android:textSize="12sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="28dp"
+            android:text="@string/dev_wired_display_section"
+            android:textSize="16sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/text_wired_display_status"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:textSize="13sp" />
+
+        <CheckBox
+            android:id="@+id/check_wired_display_hints"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_wired_display_hints" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_external_capture_policy"
+            android:textSize="14sp" />
+
+        <Spinner
+            android:id="@+id/spinner_external_capture_policy"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp" />
+
+        <TextView
+            android:id="@+id/text_external_capture_policy_note"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="4dp"
+            android:textSize="12sp" />
+
+        <CheckBox
+            android:id="@+id/check_usb_tether_transport"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_usb_tether_transport" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_wired_display_hint"
+            android:textSize="12sp" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="28dp"
+            android:text="@string/dev_commercial_section"
+            android:textSize="16sp"
+            android:textStyle="bold" />
+
+        <CheckBox
+            android:id="@+id/check_commercial_ads"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_commercial_ads" />
+
+        <CheckBox
+            android:id="@+id/check_commercial_iap"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_commercial_iap" />
+
+        <CheckBox
+            android:id="@+id/check_commercial_play_store"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_commercial_play_store" />
+
+        <Button
+            android:id="@+id/btn_open_play_store_listing"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/dev_open_play_store_listing" />
+
+        <Button
+            android:id="@+id/btn_request_play_review"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_request_play_review" />
+
+        <Button
+            android:id="@+id/btn_query_iap_products"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_query_iap_products" />
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/dev_commercial_hint"
+            android:textSize="12sp" />
+    </LinearLayout>
+</ScrollView>

app/src/main/res/layout/activity_developer_settings.xml

@@ -1,323 +1,34 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fillViewport="true">
+    android:orientation="vertical">
 
-    <LinearLayout
+    <com.google.android.material.tabs.TabLayout
+        android:id="@+id/dev_settings_tabs"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:orientation="vertical"
-        android:padding="24dp">
+        app:tabMode="fixed"
+        app:tabGravity="fill" />
 
-        <TextView
+    <FrameLayout
+        android:id="@+id/dev_settings_tab_host"
         android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:text="@string/developer_settings_title"
-            android:textSize="20sp"
-            android:textStyle="bold" />
+        android:layout_height="0dp"
+        android:layout_weight="1">
 
-        <CheckBox
-            android:id="@+id/check_receiver_debug_overlay"
+        <include
+            android:id="@+id/dev_panel_settings"
+            layout="@layout/activity_dev_settings_panel"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="24dp"
-            android:text="@string/dev_show_receiver_debug_overlay" />
+            android:layout_height="match_parent" />
 
-        <CheckBox
-            android:id="@+id/check_show_codec_priority_scores"
+        <include
+            android:id="@+id/dev_panel_diagnostics"
+            layout="@layout/activity_dev_diagnostics_panel"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_show_codec_priority_scores" />
-
-        <CheckBox
-            android:id="@+id/check_grab_session_stats"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_grab_session_stats" />
-
-        <CheckBox
-            android:id="@+id/check_receiver_adaptive_display"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_receiver_adaptive_display" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="28dp"
-            android:text="@string/dev_sender_resolution_ui_section"
-            android:textSize="16sp"
-            android:textStyle="bold" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_sender_resolution_ui_mode"
-            android:textSize="14sp" />
-
-        <Spinner
-            android:id="@+id/spinner_dev_sender_resolution_ui_mode"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_sender_resolution_ui_hint"
-            android:textSize="12sp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="28dp"
-            android:text="@string/dev_av_presets_section"
-            android:textSize="16sp"
-            android:textStyle="bold" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_av_video_preset"
-            android:textSize="14sp" />
-
-        <Spinner
-            android:id="@+id/spinner_dev_video_preset"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_av_audio_preset"
-            android:textSize="14sp" />
-
-        <Spinner
-            android:id="@+id/spinner_dev_audio_preset"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp" />
-
-        <TextView
-            android:id="@+id/label_dev_av_intensity"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_av_intensity"
-            android:textSize="14sp" />
-
-        <SeekBar
-            android:id="@+id/seek_dev_av_intensity"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp"
-            android:max="10"
-            android:progress="5" />
-
-        <TextView
-            android:id="@+id/text_dev_av_intensity_value"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:textSize="12sp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_av_presets_hint"
-            android:textSize="12sp" />
-
-        <Button
-            android:id="@+id/btn_open_session_stats"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="20dp"
-            android:text="@string/session_stats_open" />
-
-        <Button
-            android:id="@+id/btn_reload_codecs_json"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_reload_codecs_json" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_reload_codecs_json_hint"
-            android:textSize="12sp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="28dp"
-            android:text="@string/ota_section_title"
-            android:textSize="16sp"
-            android:textStyle="bold" />
-
-        <TextView
-            android:id="@+id/text_ota_installed_version"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:textSize="13sp" />
-
-        <com.google.android.material.textfield.TextInputLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:hint="@string/ota_manifest_url_hint">
-
-            <com.google.android.material.textfield.TextInputEditText
-                android:id="@+id/edit_ota_manifest_url"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:inputType="textUri" />
-        </com.google.android.material.textfield.TextInputLayout>
-
-        <CheckBox
-            android:id="@+id/check_ota_on_launch"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:checked="true"
-            android:text="@string/ota_check_on_launch" />
-
-        <Button
-            android:id="@+id/btn_check_ota"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/ota_check_now" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/ota_section_hint"
-            android:textSize="12sp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="28dp"
-            android:text="@string/dev_wired_display_section"
-            android:textSize="16sp"
-            android:textStyle="bold" />
-
-        <TextView
-            android:id="@+id/text_wired_display_status"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:textSize="13sp" />
-
-        <CheckBox
-            android:id="@+id/check_wired_display_hints"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_wired_display_hints" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_external_capture_policy"
-            android:textSize="14sp" />
-
-        <Spinner
-            android:id="@+id/spinner_external_capture_policy"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp" />
-
-        <TextView
-            android:id="@+id/text_external_capture_policy_note"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="4dp"
-            android:textSize="12sp" />
-
-        <CheckBox
-            android:id="@+id/check_usb_tether_transport"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_usb_tether_transport" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_wired_display_hint"
-            android:textSize="12sp" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="28dp"
-            android:text="@string/dev_commercial_section"
-            android:textSize="16sp"
-            android:textStyle="bold" />
-
-        <CheckBox
-            android:id="@+id/check_commercial_ads"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_commercial_ads" />
-
-        <CheckBox
-            android:id="@+id/check_commercial_iap"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_commercial_iap" />
-
-        <CheckBox
-            android:id="@+id/check_commercial_play_store"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_commercial_play_store" />
-
-        <Button
-            android:id="@+id/btn_open_play_store_listing"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="12dp"
-            android:text="@string/dev_open_play_store_listing" />
-
-        <Button
-            android:id="@+id/btn_request_play_review"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_request_play_review" />
-
-        <Button
-            android:id="@+id/btn_query_iap_products"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_query_iap_products" />
-
-        <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginTop="8dp"
-            android:text="@string/dev_commercial_hint"
-            android:textSize="12sp" />
+            android:layout_height="match_parent"
+            android:visibility="gone" />
+    </FrameLayout>
 </LinearLayout>
-</ScrollView>

app/src/main/res/layout/view_dev_diag_card.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginBottom="12dp"
+    app:cardUseCompatPadding="true">
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="14dp">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <TextView
+                android:id="@+id/dev_diag_card_title"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:textSize="15sp"
+                android:textStyle="bold" />
+
+            <TextView
+                android:id="@+id/dev_diag_card_body"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dp"
+                android:fontFamily="monospace"
+                android:textSize="12sp"
+                android:textIsSelectable="true" />
+        </LinearLayout>
+
+        <ProgressBar
+            android:id="@+id/dev_diag_card_spinner"
+            style="?android:attr/progressBarStyle"
+            android:layout_width="32dp"
+            android:layout_height="32dp"
+            android:layout_gravity="top|end"
+            android:visibility="gone" />
+    </FrameLayout>
+</com.google.android.material.card.MaterialCardView>

app/src/main/res/values-ru/strings.xml

@@ -196,6 +196,18 @@
     <string name="licenses_title">Лицензии</string>
     <string name="licenses_load_error">Не могу найти факл лицензий</string>
     <string name="developer_settings_title">Для разработчиков</string>
+    <string name="dev_tab_settings">Настройки</string>
+    <string name="dev_tab_diagnostics">Диагностика</string>
+    <string name="dev_diag_intro">Поддерживаемые возможности — быстрые проверки без ввода. Запускаются в фоне при открытии вкладки.</string>
+    <string name="dev_diag_stop">Остановить тесты</string>
+    <string name="dev_diag_pending">Ожидание…</string>
+    <string name="dev_diag_running">Выполняется…</string>
+    <string name="dev_diag_stopped">Остановлено</string>
+    <string name="dev_diag_hw_title">Аппаратное ускорение (видео)</string>
+    <string name="dev_diag_camera_title">Захват с камеры</string>
+    <string name="dev_diag_audio_title">Захват звука</string>
+    <string name="dev_diag_network_title">Сеть</string>
+    <string name="dev_diag_casting_title">Другой вывод / трансляция</string>
     <string name="dev_sender_resolution_ui_section">Разрешение отправителя (тест)</string>
     <string name="dev_sender_resolution_ui_mode">Режим списка разрешений</string>
     <string name="dev_sender_resolution_ui_separated">Раздельный (Оригинал / 720p / 480p / Авто)</string>

app/src/main/res/values/strings.xml

@@ -207,6 +207,18 @@
     <string name="licenses_title">Licenses</string>
     <string name="licenses_load_error">Could not load license text.</string>
     <string name="developer_settings_title">Developer settings</string>
+    <string name="dev_tab_settings">Settings</string>
+    <string name="dev_tab_diagnostics">Diagnostics</string>
+    <string name="dev_diag_intro">Supported features — quick read-only probes. Tests run in the background when you open this tab.</string>
+    <string name="dev_diag_stop">Stop tests</string>
+    <string name="dev_diag_pending">Waiting…</string>
+    <string name="dev_diag_running">Running…</string>
+    <string name="dev_diag_stopped">Stopped</string>
+    <string name="dev_diag_hw_title">Hardware acceleration (video)</string>
+    <string name="dev_diag_camera_title">Camera capture</string>
+    <string name="dev_diag_audio_title">Sound capture</string>
+    <string name="dev_diag_network_title">Network</string>
+    <string name="dev_diag_casting_title">Other casting / display</string>
     <string name="dev_sender_resolution_ui_section">Sender resolution UI (test)</string>
     <string name="dev_sender_resolution_ui_mode">Resolution preset mode</string>
     <string name="dev_sender_resolution_ui_separated">Separated (Original / 720p / 480p / Auto)</string>