设置音量调节异常

问题描述

设备连接otg外设音响，或者bt设备，进入设置界面，设置ring seekbar后，再设置media seekbar后，ring seekbar会异常变动。

原因分析

调整seekbar会播放提示音，由于连接了外部设置，会触发AudioService 发送广播

private void observeDevicesForStreams(int skipStream) {
        synchronized (VolumeStreamState.class) {
            for (int stream = 0; stream < mStreamStates.length; stream++) {
                if (stream != skipStream) {
                    mStreamStates[stream].observeDevicesForStream_syncVSS(false /*checkOthers*/);
                }
            }
        }
    }

        public int observeDevicesForStream_syncVSS(boolean checkOthers) {
            final int devices = AudioSystem.getDevicesForStream(mStreamType);
            if (devices == mObservedDevices) {
                return devices;
            }
            final int prevDevices = mObservedDevices;
            mObservedDevices = devices;
            if (checkOthers) {
                // one stream's devices have changed, check the others
                observeDevicesForStreams(mStreamType);
            }
            // log base stream changes to the event log
            if (mStreamVolumeAlias[mStreamType] == mStreamType) {
                EventLogTags.writeStreamDevicesChanged(mStreamType, prevDevices, devices);
            }
            sendBroadcastToAll(mStreamDevicesChanged
                    .putExtra(AudioManager.EXTRA_PREV_VOLUME_STREAM_DEVICES, prevDevices)
                    .putExtra(AudioManager.EXTRA_VOLUME_STREAM_DEVICES, devices));
            return devices;
        }            

而framework SeekBarVolumizer.java 中注册监听这个广播，对这个广播逻辑处理有问题。

修改方案

代码用添加判断

            } else if (AudioManager.STREAM_DEVICES_CHANGED_ACTION.equals(action)) {
                int streamType = intent.getIntExtra(AudioManager.EXTRA_VOLUME_STREAM_TYPE, -1);
                int streamVolume = mAudioManager.getStreamVolume(streamType);
                /*meig:jicong.wang modify for bug P_RS51_E-629 start {@*/
                if (streamType==mStreamType) {
                    updateVolumeSlider(streamType, streamVolume);
                }
                /*meig:jicong.wang modify for bug P_RS51_E-629 end @}*/