Android7.0 设置音量最小时有声音输出

最近接到产品部反人类的需求，音量按键减按键按到最小时保持有一定分贝的声音输出，咋搞好呢？不多说直接上代码

diff --git a/services/core/java/com/android/server/audio/AudioService.java b/services/core/java/com/android/server/audio/AudioService.java
index f219728..8e203d5 100755
--- a/services/core/java/com/android/server/audio/AudioService.java
+++ b/services/core/java/com/android/server/audio/AudioService.java
@@ -1236,6 +1236,17 @@ public class AudioService extends IAudioService.Stub {
if (DEBUG_VOL) Log.d(TAG, "Volume controller suppressed adjustment");
}

+ //Added by lefty_lan in 2018-9-5 start
+ int streamTypeAlias = mStreamVolumeAlias[streamType];
+ final int device = getDeviceForStream(streamTypeAlias);
+ int index = mStreamStates[streamType].getIndex(device);
+ Log.d(TAG, "lefty_lan ***************************index000=" + index );
+ if ((direction == -1) && (index == 30)){
+ direction = AudioManager.ADJUST_SAME;
+ Log.d(TAG, "lefty_lan ***************************index111=" + index );
+ }
+ //Added by lefty_lan in 2018-9-5 end
+
adjustStreamVolume(streamType, direction, flags, callingPackage, caller, uid);
}

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总结：

只要思想不滑坡，方法总比困难多！

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