chore(samples): Update sample app to support Perfetto profiling testing

Adds UI controls to the profiling sample activity for testing both
legacy and Perfetto profiling paths. Enables useProfilingManager
flag in the sample manifest for API 35+ testing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 43jay

sentry-samples/sentry-samples-android/src/main/AndroidManifest.xml

@@ -163,6 +163,10 @@
     <meta-data
       android:name="io.sentry.traces.profiling.start-on-app-start"
       android:value="true" />
+    <!-- Enable ProfilingManager (Perfetto) on API 35+ -->
+    <meta-data
+      android:name="io.sentry.profiling.use-profiling-manager"
+      android:value="true" />
 
     <!--    how to disable the Activity auto instrumentation for tracing-->
     <!--    <meta-data android:name="io.sentry.traces.activity.enable" android:value="false" />-->

sentry-samples/sentry-samples-android/src/main/java/io/sentry/samples/android/ProfilingActivity.kt

@@ -1,5 +1,6 @@
 package io.sentry.samples.android
 
+import android.os.Build
 import android.os.Bundle
 import android.view.View
 import android.widget.SeekBar
@@ -22,6 +23,7 @@ class ProfilingActivity : AppCompatActivity() {
   private lateinit var binding: ActivityProfilingBinding
   private val executors = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors())
   private var profileFinished = true
+  private var manualProfilingActive = false
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
@@ -30,7 +32,7 @@ class ProfilingActivity : AppCompatActivity() {
       this,
       object : OnBackPressedCallback(true) {
         override fun handleOnBackPressed() {
-          if (profileFinished) {
+          if (profileFinished && !manualProfilingActive) {
             isEnabled = false
             onBackPressedDispatcher.onBackPressed()
           } else {
@@ -42,6 +44,16 @@ class ProfilingActivity : AppCompatActivity() {
     )
     binding = ActivityProfilingBinding.inflate(layoutInflater)
 
+    // Show which profiler backend is active
+    val options = Sentry.getCurrentScopes().options
+    val isPerfetto = options.isUseProfilingManager && Build.VERSION.SDK_INT >= 35
+    binding.profilingStatus.text =
+      if (isPerfetto) {
+        getString(R.string.profiling_status_perfetto)
+      } else {
+        getString(R.string.profiling_status_legacy)
+      }
+
     binding.profilingDurationSeekbar.setOnSeekBarChangeListener(
       object : SeekBar.OnSeekBarChangeListener {
         override fun onProgressChanged(p0: SeekBar, p1: Int, p2: Boolean) {
@@ -76,6 +88,7 @@ class ProfilingActivity : AppCompatActivity() {
     binding.profilingList.adapter = ProfilingListAdapter()
     binding.profilingList.layoutManager = LinearLayoutManager(this)
 
+    // Transaction-based profiling (existing)
     binding.profilingStart.setOnClickListener {
       binding.profilingProgressBar.visibility = View.VISIBLE
       profileFinished = false
@@ -92,6 +105,33 @@ class ProfilingActivity : AppCompatActivity() {
         }
         .start()
     }
+
+    // Manual continuous profiling (exercises Perfetto path on API 35+)
+    binding.profilingStartManual.setOnClickListener {
+      if (!manualProfilingActive) {
+        Sentry.startProfiler()
+        manualProfilingActive = true
+        profileFinished = false
+        binding.profilingStartManual.text = getString(R.string.profiling_stop_manual)
+        binding.profilingProgressBar.visibility = View.VISIBLE
+
+        // Start background work to generate interesting profile data
+        val threads = getBackgroundThreads()
+        repeat(threads) { executors.submit { runMathOperations() } }
+        executors.submit { swipeList() }
+
+        binding.profilingResult.text = getString(R.string.profiling_manual_started)
+      } else {
+        Sentry.stopProfiler()
+        manualProfilingActive = false
+        profileFinished = true
+        binding.profilingStartManual.text = getString(R.string.profiling_start_manual)
+        binding.profilingProgressBar.visibility = View.GONE
+
+        binding.profilingResult.text = getString(R.string.profiling_manual_stopped)
+      }
+    }
+
     setContentView(binding.root)
     Sentry.reportFullyDisplayed()
   }

sentry-samples/sentry-samples-android/src/main/res/layout/activity_profiling.xml

@@ -38,11 +38,34 @@
     android:gravity="center"
     android:text="@string/profiling_result" />
 
-  <Button
-    android:id="@+id/profiling_start"
-    android:layout_width="wrap_content"
+  <TextView
+    android:id="@+id/profiling_status"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:gravity="center"
+    android:textStyle="bold"
+    android:paddingTop="8dp"
+    android:paddingBottom="4dp" />
+
+  <LinearLayout
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:text="@string/profiling_start" />
+    android:orientation="horizontal"
+    android:gravity="center">
+
+    <Button
+      android:id="@+id/profiling_start"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:text="@string/profiling_start" />
+
+    <Button
+      android:id="@+id/profiling_start_manual"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:text="@string/profiling_start_manual" />
+
+  </LinearLayout>
 
   <ProgressBar
     android:id="@+id/profiling_progress_bar"

sentry-samples/sentry-samples-android/src/main/res/values/strings.xml

@@ -51,7 +51,13 @@ Nulla interdum gravida augue, vel fringilla lorem bibendum vel. In hac habitasse
   <string name="profiling_threads">Background threads to use: %d</string>
   <string name="profiling_running">Profiling is running</string>
   <string name="profiling_no_dir_set">No profiling dir path set</string>
-  <string name="profiling_start">Start Profiling</string>
+  <string name="profiling_start">Start (Transaction)</string>
+  <string name="profiling_start_manual">Start (Manual)</string>
+  <string name="profiling_stop_manual">Stop (Manual)</string>
+  <string name="profiling_status_perfetto">Profiler: Perfetto (ProfilingManager API 35+)</string>
+  <string name="profiling_status_legacy">Profiler: Legacy (simpleperf)</string>
+  <string name="profiling_manual_started">Manual profiler started</string>
+  <string name="profiling_manual_stopped">Manual profiler stopped — chunk sent to Sentry</string>
   <string name="profiling_result">Profile trace file size = %d bytes \nItem payload size = %d bytes \nData sent to Sentry size = %d bytes</string>
   <string name="open_camera_activity">Open Camera Activity</string>
   <string name="open_http_request_activity">Open Trigger HTTP Request Activity</string>