android SD卡热插拔监听

最新推荐文章于 2021-12-13 17:56:52 发布

xumin1986613

最新推荐文章于 2021-12-13 17:56:52 发布

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CC 4.0 BY-SA版权

文章标签： Android

本文链接：https://blog.youkuaiyun.com/xumin1986613/article/details/83780141

本文介绍了一个简单的Android应用程序组件，用于监听SD卡的状态变化。通过注册BroadcastReceiver并设置IntentFilter，可以接收与SD卡相关的广播事件，如挂载、卸载等，并在收到这些事件时更新用户界面。

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//初始化receiver
protected void onResume()
{
super.onResume();
IntentFilter intentFilter = new IntentFilter(
Intent.ACTION_MEDIA_MOUNTED);
intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);
intentFilter.addDataScheme("file");

// install an intent filter to receive SD card related events.
mReceiver = new BroadcastReceiver()
{

public void onReceive(Context arg0, Intent arg1)
{
onReceiveSdCardBroadCast(arg1);
}
};
registerReceiver(mReceiver, intentFilter);
initUI(!isUnMount);
}

//接到广播后处理
private void onReceiveSdCardBroadCast(Intent intent)
{
String action = intent.getAction();
Log.i(TAG, "receive broadcast " + action);
if (Intent.ACTION_MEDIA_MOUNTED.equals(action))
{
initUI(true);
}
else if (Intent.ACTION_MEDIA_UNMOUNTED.equals(action))
{
initUI(false);
}
else if (Intent.ACTION_MEDIA_EJECT.equals(action))
{
initUI(false);
}
}

//注销receiver
protected void onDestroy()
{
Log.i(TAG, TAG + " is onDestroy");
super.onDestroy();
if (mReceiver != null)
{
unregisterReceiver(mReceiver);
mReceiver = null;
}
}