Adds support for USB audio devices in AppRTCMobile on Android

webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCAudioManager.java

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 package org.appspot.apprtc;
 
 import org.appspot.apprtc.util.AppRTCUtils;
 
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.media.AudioDeviceInfo;
 import android.media.AudioManager;
+import android.os.Build;
 import android.preference.PreferenceManager;
 import android.util.Log;
 
 import org.webrtc.ThreadUtils;
 
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
@@ skipping 398 matching lines @@
 
   /**
    * Checks whether a wired headset is connected or not.
    * This is not a valid indication that audio playback is actually over
    * the wired headset as audio routing depends on other conditions. We
    * only use it as an early indicator (during initialization) of an attached
    * wired headset.
    */
   @Deprecated
   private boolean hasWiredHeadset() {
-    return audioManager.isWiredHeadsetOn();
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+      return audioManager.isWiredHeadsetOn();
+    } else {
+      final AudioDeviceInfo[] devices = audioManager.getDevices(AudioManager.GET_DEVICES_ALL);
+      for (AudioDeviceInfo device : devices) {
+        final int type = device.getType();
+        if (type == AudioDeviceInfo.TYPE_WIRED_HEADSET) {
+          Log.d(TAG, "hasWiredHeadset: found wired headset");
+          return true;
+        } else if (type == AudioDeviceInfo.TYPE_USB_DEVICE) {
+          Log.d(TAG, "hasWiredHeadset: found USB audio device");
+          return true;
+        } else if (type == AudioDeviceInfo.TYPE_USB_HEADSET) {
+          Log.d(TAG, "hasWiredHeadset: found USB headset");
+          return true;
+        }
+      }
+      return false;
+    }
   }
 
   /**
    * Updates list of possible audio devices and make new device selection.
    * TODO(henrika): add unit test to verify all state transitions.
    */
   public void updateAudioDeviceState() {
     ThreadUtils.checkIsOnMainThread();
     Log.d(TAG, "--- updateAudioDeviceState: "
             + "wired headset=" + hasWiredHeadset + ", "
@@ skipping 118 matching lines @@
               + "available=" + audioDevices + ", "
               + "selected=" + newAudioDevice);
       if (audioManagerEvents != null) {
         // Notify a listening client that audio device has been changed.
         audioManagerEvents.onAudioDeviceChanged(selectedAudioDevice, audioDevices);
       }
     }
     Log.d(TAG, "--- updateAudioDeviceState done");
   }
 }