通过广播检测sdcard插拔操作

public class TestSdcard extends Activity {

	@Override
	protected void onDestroy() {
		super.onDestroy();
		//退出的时候需要取消广播接收
		this.unregisterReceiver(in);
	}

	DetectSdcard in;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		in = new DetectSdcard();
		IntentFilter intentf = new IntentFilter();
		intentf.addAction(Intent.ACTION_MEDIA_MOUNTED);
		intentf.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
		//隐式intent需要加上下面这句作匹配，否则接收不到广播
		intentf.addDataScheme("file");  
		this.registerReceiver(in, intentf);
	}

	// 检测sdcard是否在机器中
	public class DetectSdcard extends BroadcastReceiver {

		@Override
		public void onReceive(Context context, Intent intent) {
			if(intent.getAction().equals(Intent.ACTION_MEDIA_MOUNTED))
			{
			//挂载的...	
			}
			else if(intent.getAction().equals(Intent.ACTION_MEDIA_UNMOUNTED))
			{
				//非挂载...
			}
		}

	}


}