Android12 断电音量没保存

AudioService.java
private void persistVolume(VolumeStreamState streamState, int device) {
     if (mUseFixedVolume) {
         return;
     }
     if (mIsSingleVolume && (streamState.mStreamType != AudioSystem.STREAM_MUSIC)) {
         return;
     }
     if (streamState.hasValidSettingsName()) {
         System.putIntForUser(mContentResolver,
                 streamState.getSettingNameForDevice(device),
                 (streamState.getIndex(device) + 5)/ 10,
                 UserHandle.USER_CURRENT);
         if(isBox())
             streamState.restoreAllDeviceIndex();
		if(isTablet())
		             streamState.restoreSyncDevicesIndex();
				// 断电音量没保存，强制更新
				cmdhandler.removeCallbacks(runnable);
		         cmdhandler.postDelayed(runnable,2000);
     }
 }

    private Handler cmdhandler = new Handler();
    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            execCmd("sync");
        }
    };	
	
    public void execCmd(String cmd) {
        OutputStream outputStream = null;
        DataOutputStream dataOutputStream = null;
        try {
            java.lang.Process p = Runtime.getRuntime().exec("sh");
            outputStream = p.getOutputStream();
            dataOutputStream = new DataOutputStream(outputStream);
            dataOutputStream.writeBytes(cmd);
            dataOutputStream.flush();
			Log.d(TAG, "execCmd " + cmd +" success");
        } catch (Exception e) {
			Log.e(TAG, "execCmd " + cmd +" failed");
            e.printStackTrace();
        } finally {
            if (null != dataOutputStream) {
                try {
                    dataOutputStream.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (null != outputStream) {
                try {
                    outputStream.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }