Use separate audio capture code for Android 11

The code to start audio capture is more complicated for Android 11
(launch a fake popup, wait, make several attempts, close the shell
package).

Use a distinct code path specific to Android 11.

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

@@ -59,60 +59,58 @@ private static AudioRecord createAudioRecord() {
     }
 
     private static void startWorkaroundAndroid11() {
-        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
-            // Android 11 requires Apps to be at foreground to record audio.
-            // Normally, each App has its own user ID, so Android checks whether the requesting App has the user ID that's at the foreground.
-            // But scrcpy server is NOT an App, it's a Java application started from Android shell, so it has the same user ID (2000) with Android
-            // shell ("com.android.shell").
-            // If there is an Activity from Android shell running at foreground, then the permission system will believe scrcpy is also in the
-            // foreground.
-            if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
-                Intent intent = new Intent(Intent.ACTION_MAIN);
-                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                intent.addCategory(Intent.CATEGORY_LAUNCHER);
-                intent.setComponent(new ComponentName(FakeContext.PACKAGE_NAME, "com.android.shell.HeapDumpActivity"));
-                ServiceManager.getActivityManager().startActivityAsUserWithFeature(intent);
-            }
-        }
+        // Android 11 requires Apps to be at foreground to record audio.
+        // Normally, each App has its own user ID, so Android checks whether the requesting App has the user ID that's at the foreground.
+        // But scrcpy server is NOT an App, it's a Java application started from Android shell, so it has the same user ID (2000) with Android
+        // shell ("com.android.shell").
+        // If there is an Activity from Android shell running at foreground, then the permission system will believe scrcpy is also in the
+        // foreground.
+        Intent intent = new Intent(Intent.ACTION_MAIN);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.addCategory(Intent.CATEGORY_LAUNCHER);
+        intent.setComponent(new ComponentName(FakeContext.PACKAGE_NAME, "com.android.shell.HeapDumpActivity"));
+        ServiceManager.getActivityManager().startActivityAsUserWithFeature(intent);
     }
 
     private static void stopWorkaroundAndroid11() {
-        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
-            ServiceManager.getActivityManager().forceStopPackage(FakeContext.PACKAGE_NAME);
-        }
+        ServiceManager.getActivityManager().forceStopPackage(FakeContext.PACKAGE_NAME);
     }
 
     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();
+                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...");
-                    }
+                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 {
-                    throw e;
+                    Ln.d("Failed to start audio capture, retrying...");
                 }
             }
         }
     }
 
+    private void startRecording() {
+        recorder = createAudioRecord();
+        recorder.startRecording();
+    }
+
     public void start() throws AudioCaptureForegroundException {
-        startWorkaroundAndroid11();
-        try {
-            tryStartRecording(3, 100);
-        } finally {
-            stopWorkaroundAndroid11();
+        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.R) {
+            startWorkaroundAndroid11();
+            try {
+                tryStartRecording(3, 100);
+            } finally {
+                stopWorkaroundAndroid11();
+            }
+        } else {
+            startRecording();
         }
     }