Android(安卓)音量调节

frameworks/base/media/java/android/media/AudioService.java
1190     private int getActiveStreamType(int suggestedStreamType) {1191         boolean isOffhook = false;1192         try {1193             ITelephony phone = ITelephony.Stub.asInterface(ServiceManager.checkService("phone"));1194             if (phone != null) isOffhook = phone.isOffhook();1195         } catch (RemoteException e) {1196             Log.w(TAG, "Couldn't connect to phone service", e);1197         }11981199         if (AudioSystem.getForceUse(AudioSystem.FOR_COMMUNICATION) == AudioSystem.FORCE_BT_SCO) {1200             // Log.v(TAG, "getActiveStreamType: Forcing STREAM_BLUETOOTH_SCO...");1201             return AudioSystem.STREAM_BLUETOOTH_SCO;1202         } else if (isOffhook || AudioSystem.isStreamActive(AudioSystem.STREAM_VOICE_CALL)) {1203             // Log.v(TAG, "getActiveStreamType: Forcing STREAM_VOICE_CALL...");1204             return AudioSystem.STREAM_VOICE_CALL;1205         } else if (AudioSystem.isStreamActive(AudioSystem.STREAM_MUSIC)) {1206             // Log.v(TAG, "getActiveStreamType: Forcing STREAM_MUSIC...");1207             return AudioSystem.STREAM_MUSIC;1208         } else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {1209             // Log.v(TAG, "getActiveStreamType: Forcing STREAM_RING...");1210             return AudioSystem.STREAM_MUSIC; //STREAM_RING;1211         } else {1212             // Log.v(TAG, "getActiveStreamType: Returning suggested type " + suggestedStreamType);1213             return suggestedStreamType;1214         }1215     }
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