android 系统中静音后使得音量减键不能解除静音

在以下位置做如下注释掉其中一部分即可（最后面几行）：

frameworks / base/services/core/java/com/android/server/audio/AudioService.java

private void adjustStreamVolume(int streamType, int direction, int flags,String callingPackage, String caller, int uid) {if (mUseFixedVolume) {return;}if (DEBUG_VOL) Log.d(TAG, "adjustStreamVolume() stream=" + streamType + ", dir=" + direction+ ", flags=" + flags + ", caller=" + caller);ensureValidDirection(direction);ensureValidStreamType(streamType);boolean isMuteAdjust = isMuteAdjust(direction);if (isMuteAdjust && !isStreamAffectedByMute(streamType)) {return;}// use stream type alias here so that streams with same alias have the same behavior,// including with regard to silent mode control (e.g the use of STREAM_RING below and in// checkForRingerModeChange() in place of STREAM_RING or STREAM_NOTIFICATION)int streamTypeAlias = mStreamVolumeAlias[streamType];VolumeStreamState streamState = mStreamStates[streamTypeAlias];final int device = getDeviceForStream(streamTypeAlias);int aliasIndex = streamState.getIndex(device);boolean adjustVolume = true;int step;// skip a2dp absolute volume control request when the device// is not an a2dp deviceif ((device & AudioSystem.DEVICE_OUT_ALL_A2DP) == 0 &&(flags & AudioManager.FLAG_BLUETOOTH_ABS_VOLUME) != 0) {return;}// If we are being called by the system (e.g. hardware keys) check for current user// so we handle user restrictions correctly.if (uid == android.os.Process.SYSTEM_UID) {uid = UserHandle.getUid(getCurrentUserId(), UserHandle.getAppId(uid));}if (mAppOps.noteOp(STREAM_VOLUME_OPS[streamTypeAlias], uid, callingPackage)!= AppOpsManager.MODE_ALLOWED) {return;}// reset any pending volume commandsynchronized (mSafeMediaVolumeState) {mPendingVolumeCommand = null;}flags &= ~AudioManager.FLAG_FIXED_VOLUME;if ((streamTypeAlias == AudioSystem.STREAM_MUSIC) &&((device & mFixedVolumeDevices) != 0)) {flags |= AudioManager.FLAG_FIXED_VOLUME;// Always toggle between max safe volume and 0 for fixed volume devices where safe// volume is enforced, and max and 0 for the others.// This is simulated by stepping by the full allowed volume rangeif (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_ACTIVE &&(device & mSafeMediaVolumeDevices) != 0) {step = mSafeMediaVolumeIndex;} else {step = streamState.getMaxIndex();}if (aliasIndex != 0) {aliasIndex = step;}} else {// convert one UI step (+/-1) into a number of internal units on the stream aliasstep = rescaleIndex(10, streamType, streamTypeAlias);}// If either the client forces allowing ringer modes for this adjustment,// or the stream type is one that is affected by ringer modesif (((flags & AudioManager.FLAG_ALLOW_RINGER_MODES) != 0) ||(streamTypeAlias == getUiSoundsStreamType())) {int ringerMode = getRingerModeInternal();// do not vibrate if already in vibrate modeif (ringerMode == AudioManager.RINGER_MODE_VIBRATE) {flags &= ~AudioManager.FLAG_VIBRATE;}// Check if the ringer mode handles this adjustment. If it does we don't// need to adjust the volume further.final int result = checkForRingerModeChange(aliasIndex, direction, step,streamState.mIsMuted, callingPackage, flags);adjustVolume = (result & FLAG_ADJUST_VOLUME) != 0;// If suppressing a volume adjustment in silent mode, display the UI hintif ((result & AudioManager.FLAG_SHOW_SILENT_HINT) != 0) {flags |= AudioManager.FLAG_SHOW_SILENT_HINT;}// If suppressing a volume down adjustment in vibrate mode, display the UI hintif ((result & AudioManager.FLAG_SHOW_VIBRATE_HINT) != 0) {flags |= AudioManager.FLAG_SHOW_VIBRATE_HINT;}}// If the ringermode is suppressing media, prevent changesif (!volumeAdjustmentAllowedByDnd(streamTypeAlias, flags)) {adjustVolume = false;}int oldIndex = mStreamStates[streamType].getIndex(device);if (adjustVolume && (direction != AudioManager.ADJUST_SAME)) {mAudioHandler.removeMessages(MSG_UNMUTE_STREAM);// Check if volume update should be send to AVRCPif (streamTypeAlias == AudioSystem.STREAM_MUSIC &&(device & AudioSystem.DEVICE_OUT_ALL_A2DP) != 0 &&(flags & AudioManager.FLAG_BLUETOOTH_ABS_VOLUME) == 0) {synchronized (mA2dpAvrcpLock) {if (mA2dp != null && mAvrcpAbsVolSupported) {mA2dp.adjustAvrcpAbsoluteVolume(direction);}}}if (isMuteAdjust) {boolean state;if (direction == AudioManager.ADJUST_TOGGLE_MUTE) {state = !streamState.mIsMuted;} else {state = direction == AudioManager.ADJUST_MUTE;}if (streamTypeAlias == AudioSystem.STREAM_MUSIC) {setSystemAudioMute(state);}for (int stream = 0; stream < mStreamStates.length; stream++) {if (streamTypeAlias == mStreamVolumeAlias[stream]) {if (!(readCameraSoundForced()&& (mStreamStates[stream].getStreamType()== AudioSystem.STREAM_SYSTEM_ENFORCED))) {mStreamStates[stream].mute(state);}}}} else if ((direction == AudioManager.ADJUST_RAISE) &&!checkSafeMediaVolume(streamTypeAlias, aliasIndex + step, device)) {Log.e(TAG, "adjustStreamVolume() safe volume index = " + oldIndex);mVolumeController.postDisplaySafeVolumeWarning(flags);} else if (streamState.adjustIndex(direction * step, device, caller)|| streamState.mIsMuted) {// Post message to set system volume (it in turn will post a// message to persist).if (streamState.mIsMuted) {// Unmute the stream if it was previously mutedif (direction == AudioManager.ADJUST_RAISE) {// unmute immediately for volume upstreamState.mute(false);mStreamStates[1].mute(false);}else if (direction == AudioManager.ADJUST_LOWER) {  **//注释掉这个条件中的代码即可**if (mIsSingleVolume) {sendMsg(mAudioHandler, MSG_UNMUTE_STREAM, SENDMSG_QUEUE,streamTypeAlias, flags, null, UNMUTE_STREAM_DELAY);}}}sendMsg(mAudioHandler,MSG_SET_DEVICE_VOLUME,SENDMSG_QUEUE,device,0,streamState,0);}

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android 系统中静音后使得音量减键不能解除静音

在以下位置做如下注释掉其中一部分即可（最后面几行）：

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