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ArcGIS Pro SDK (九)几何 14 检索与导入、导出 - 副本

hoohack 2024-07-28 阅读 24

(1)settings内,可设置音频流音量,如下图:

(2)settings调整音量条进度,会触发SeekBarVolumizer对象:

SeekBarVolumizer文件路径:
frameworks/base/core/java/android/preference/SeekBarVolumizer.java

SeekBarVolumizer对象,handle会接到MSG_SET_STREAM_VOLUME事件:
public boolean handleMessage(Message msg) {

switch (msg.what) {
  case MSG_SET_STREAM_VOLUME:
    if (mMuted && mLastProgress > 0) {
      mAudioManager.adjustStreamVolume(mStreamType, AudioManager.ADJUST_UNMUTE, 0);
    } else if (!mMuted && mLastProgress == 0) {
      mAudioManager.adjustStreamVolume(mStreamType, AudioManager.ADJUST_MUTE, 0);
    }
    mAudioManager.setStreamVolume(mStreamType, mLastProgress,AudioManager.FLAG_SHOW_UI_WARNINGS);
    break;
    ...
  }

return true;
}

(3)调用AudioManager对象,执行对应流音量大小调整:

AudioManager文件路径:
frameworks/base/media/java/android/media/AudioManager.java

AudioManager对象执行,音量调整函数:
public void setStreamVolume(int streamType, int index, int flags) {
  final IAudioService service = getService();
  try {
      service.setStreamVolume(streamType, index, flags, getContext().getOpPackageName());
  } catch (RemoteException e) {
      throw e.rethrowFromSystemServer();
 }
}


在设置APK内,触发不同音量进度条,会拉起setStreamVolume()函数,完成对应音频流音量大小调整。

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