Android音量加减键默认为调节媒体音量

楼主^#

更多发布于：2021-04-07 10:55

Android音量键默认是调节铃声的，我们产品多为用于播放广告视频等媒体文件，所以用户大多数情况都是希望调节媒体音量，于是我们修改改了音量调节的默认Type,修改如下：
frameworks/base/services/core/java/com/android/server/audio/AudioService.java

private int getActiveStreamType(int suggestedStreamType) {
   if (mIsSingleVolume
   && suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {
   return AudioSystem.STREAM_MUSIC;
   }

   switch (mPlatformType) {
   case AudioSystem.PLATFORM_VOICE:
   if (isInCommunication()) {
   if (AudioSystem.getForceUse(AudioSystem.FOR_COMMUNICATION)
   == AudioSystem.FORCE_BT_SCO) {
   // Log.v(TAG, "getActiveStreamType: Forcing STREAM_BLUETOOTH_SCO...");
   return AudioSystem.STREAM_BLUETOOTH_SCO;
   } else {
   // Log.v(TAG, "getActiveStreamType: Forcing STREAM_VOICE_CALL...");
   return AudioSystem.STREAM_VOICE_CALL;
   }
   } else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {
   if (isAfMusicActiveRecently(sStreamOverrideDelayMs)) {
   if (DEBUG_VOL)
   Log.v(TAG, "getActiveStreamType: Forcing STREAM_MUSIC stream active");
   return AudioSystem.STREAM_MUSIC;
   } else {
   if (DEBUG_VOL)
   Log.v(TAG, "getActiveStreamType: Forcing STREAM_RING b/c default");
   return AudioSystem.STREAM_RING;
   }
   } else if (isAfMusicActiveRecently(0)) {
   if (DEBUG_VOL)
   Log.v(TAG, "getActiveStreamType: Forcing STREAM_MUSIC stream active");
   return AudioSystem.STREAM_MUSIC;
   }
   break;
   default:
   if (isInCommunication()) {
   if (AudioSystem.getForceUse(AudioSystem.FOR_COMMUNICATION)
   == AudioSystem.FORCE_BT_SCO) {
   if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Forcing STREAM_BLUETOOTH_SCO");
   return AudioSystem.STREAM_BLUETOOTH_SCO;
   } else {
   if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Forcing STREAM_VOICE_CALL");
   return AudioSystem.STREAM_VOICE_CALL;
   }
   } else if (AudioSystem.isStreamActive(AudioSystem.STREAM_NOTIFICATION,
   sStreamOverrideDelayMs) ||
   AudioSystem.isStreamActive(AudioSystem.STREAM_RING,
   sStreamOverrideDelayMs)) {
   if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Forcing STREAM_NOTIFICATION");
   return AudioSystem.STREAM_NOTIFICATION;
   } else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {
   if (isAfMusicActiveRecently(sStreamOverrideDelayMs)) {
   if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: forcing STREAM_MUSIC");
   return AudioSystem.STREAM_MUSIC;
   } else {
   if (DEBUG_VOL) Log.v(TAG,
   //"getActiveStreamType: using STREAM_NOTIFICATION as default");
   "getActiveStreamType: using STREAM_MUSIC as default");
   return /*AudioSystem.STREAM_NOTIFICATION*/AudioSystem.STREAM_MUSIC;//默认调节媒体音量
   }
   }
   break;
   }
   if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Returning suggested type "
   + suggestedStreamType);
   return suggestedStreamType;
   }

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Android音量加减键默认为调节媒体音量

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