Add snippets for anr case study for ProfilingManager v2 docs

Author: edgararriagag

misc/src/main/java/com/example/snippets/profiling/ProfilingManagerJavaSnippets.java

@@ -18,10 +18,13 @@
 import androidx.core.os.Profiling;
 import androidx.core.os.SystemTraceRequestBuilder;
 import androidx.core.os.BufferFillPolicy;
+import com.example.snippets.R;
 
 public class ProfilingManagerJavaSnippets {
   public class MainActivityJava extends Activity {
-
+    // [START android_profiling_manager_anr_case_study_java_snippet_2]
+    private static final int NETWORK_TIMEOUT_MILLISECS = 2000;
+    // [END android_profiling_manager_anr_case_study_java_snippet_2]
     public static final String TAG = "ProfilingManager";
 
     @Override
@@ -110,6 +113,84 @@ public void accept(ProfilingResult profilingResult) {
     }
     // [END android_profiling_manager_triggered_trace_java]
 
-    
+    // [START android_profiling_manager_anr_case_study_java_snippet_1]
+    public void addANRTrigger() {
+      ProfilingManager profilingManager = getApplicationContext().getSystemService(ProfilingManager.class);
+      List<ProfilingTrigger> triggers = new ArrayList<>();
+      ProfilingTrigger.Builder triggerBuilder = new ProfilingTrigger.Builder(ProfilingTrigger.TRIGGER_TYPE_ANR);
+      triggers.add(triggerBuilder.build());
+      Executor mainExecutor = Executors.newSingleThreadExecutor();
+      Consumer<ProfilingResult> resultCallback =
+          profilingResult -> {
+            // Handle uploading trace to your back-end
+          };
+      profilingManager.registerForAllProfilingResults(mainExecutor, resultCallback);
+      profilingManager.addProfilingTriggers(triggers);
+    }
+    // [END android_profiling_manager_anr_case_study_java_snippet_1]
+
+    // [START android_profiling_manager_anr_case_study_java_snippet_2]
+    public void setupButtonCallback() {
+      findViewById(R.id.submit).setOnClickListener(submitButtonView -> {
+        Trace.beginSection("MyApp:SubmitButton");
+        onClickSubmit();
+        Trace.endSection();
+      });
+    }
+
+    public void onClickSubmit() {
+      prepareNetworkRequest();
+
+      boolean networkRequestSuccess = false;
+      int maxAttempts = 10;
+      while (!networkRequestSuccess && maxAttempts > 0) {
+        networkRequestSuccess = performNetworkRequest(NETWORK_TIMEOUT_MILLISECS);
+        maxAttempts--;
+      }
+
+      if (networkRequestSuccess) {
+        handleNetworkResponse();
+      }
+    }
+
+    boolean performNetworkRequest(int timeoutMiliseconds) {
+      // [START_EXCLUDE]
+      cpuIntensiveComputation(20);
+      try {
+        if (Math.random() < 0.2) {
+          // Simulate performing a network request by waiting a random period of time
+          int networkRequestTimeMs = (int)(Math.random() * timeoutMiliseconds);
+          Thread.sleep(networkRequestTimeMs);
+          return true;
+        } else {
+          // Simulate a timeout
+          Thread.sleep(timeoutMiliseconds);
+        }
+      } catch (InterruptedException e) {}
+      return false;
+      // [END_EXCLUDE]
+    }
+
+    // [START_EXCLUDE silent]
+    void cpuIntensiveComputation(int durationMs) {
+      long start = System.currentTimeMillis();
+      while (System.currentTimeMillis() - start < durationMs) {}
+    }
+    // [END_EXCLUDE silent]
+
+    void prepareNetworkRequest() {
+      // [START_EXCLUDE]
+      cpuIntensiveComputation(1000);
+      // [END_EXCLUDE]
+    }
+
+    public void handleNetworkResponse() {
+      Trace.beginSection("handleNetworkResponse");
+      // [START_EXCLUDE]
+      cpuIntensiveComputation(2000);
+      // [END_EXCLUDE]
+      Trace.endSection();
+    }
+    // [END android_profiling_manager_anr_case_study_java_snippet_2]
   }
 }

misc/src/main/res/layout/activity_main.xml

@@ -40,4 +40,11 @@
     app:layout_constraintRight_toRightOf="parent"
     app:layout_constraintTop_toTopOf="parent" />
 
+<Button
+      android:id="@+id/submit"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_margin="150dp"
+      android:text="Button" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>