Make 3 attempts to start AudioRecord

On Android 11, a fake popup must be briefly opened to make the system
think that the shell app is in the foreground so that audio may be
recorded.

Making the shell app foreground may take some time depending on the
device, so make 3 attempts, waiting 100ms before each.

Fixes #3796 <#3796>

server/src/main/java/com/genymobile/scrcpy/AudioCapture.java

@@ -72,8 +72,6 @@ private static void startWorkaroundAndroid11() {
                 intent.addCategory(Intent.CATEGORY_LAUNCHER);
                 intent.setComponent(new ComponentName(FakeContext.PACKAGE_NAME, "com.android.shell.HeapDumpActivity"));
                 ServiceManager.getActivityManager().startActivityAsUserWithFeature(intent);
-                // Wait for activity to start
-                SystemClock.sleep(150);
             }
         }
     }
@@ -84,18 +82,35 @@ private static void stopWorkaroundAndroid11() {
         }
     }
 
+    private void tryStartRecording(int attempts, int delayMs) throws AudioCaptureForegroundException {
+        while (attempts-- > 0) {
+            // Wait for activity to start
+            SystemClock.sleep(delayMs);
+            try {
+                recorder = createAudioRecord();
+                recorder.startRecording();
+                return; // it worked
+            } catch (UnsupportedOperationException e) {
+                if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
+                    if (attempts == 0) {
+                        Ln.e("Failed to start audio capture");
+                        Ln.e("On Android 11, audio capture must be started in the foreground, make sure that the device is unlocked when starting "
+                                + "scrcpy.");
+                        throw new AudioCaptureForegroundException();
+                    } else {
+                        Ln.d("Failed to start audio capture, retrying...");
+                    }
+                } else {
+                    throw e;
+                }
+            }
+        }
+    }
+
     public void start() throws AudioCaptureForegroundException {
         startWorkaroundAndroid11();
         try {
-            recorder = createAudioRecord();
-            recorder.startRecording();
-        } catch (UnsupportedOperationException e) {
-            if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
-                Ln.e("Failed to start audio capture");
-                Ln.e("On Android 11, it is only possible to capture in foreground, make sure that the device is unlocked when starting scrcpy.");
-                throw new AudioCaptureForegroundException();
-            }
-            throw e;
+            tryStartRecording(3, 100);
         } finally {
             stopWorkaroundAndroid11();
         }