近期在项目中须要对外部存储设备的状态进行监听，所以整理了此笔记，以便日后查看。

外部存储设备的状态变化时发出的广播

对照不同状态下的广播

1. 插入外部SD卡时：

2. 移除外部SD卡时：

3. 连接PC进入USB大容量存储模式时：

4. 连接PC退出USB大容量存储模式时：

代码实现监听

public void startListen()

{

IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);

intentFilter.setPriority(1000);

intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);

intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);

intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);

intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);

intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);

intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);

intentFilter.addAction(Intent.ACTION_MEDIA_CHECKING);

intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);

intentFilter.addAction(Intent.ACTION_MEDIA_NOFS);

intentFilter.addAction(Intent.ACTION_MEDIA_BUTTON);

intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);

intentFilter.addDataScheme("file");

registerReceiver(broadcastRec, intentFilter);

}

private final BroadcastReceiver broadcastRec = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

Log.d("MediaAction", action);

if (action.equals("android.intent.action.MEDIA_MOUNTED"))

{

//todo

} else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED))

{

//todo

}else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)){

}else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)){

}else if (action.equals(Intent.ACTION_MEDIA_SHARED)){

}else {

}

}

};