分类： Android

1. 创建接收器

public class USBReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

StorageManager mStorageManager = (StorageManager) context.getSystemService(Activity.STORAGE_SERVICE);
String action = intent.getAction();
Log.d(TAG, "receive broadcast\n"+action);
if(action.equals(Intent.ACTION_MEDIA_MOUNTED)) {
   String path = intent.getData().getPath();
    //path = getCorrectPath(path);//获取正确的，完整的路径
    Log.d(TAG, "THE PATH IS:\n"+path);
}

}
}

2. 定义变量

USBReceiver usbBroadcast;

3. 在onCreate 下面注册广播

usbBroadcast = new USBReceiver();
IntentFilter usbFilter= new IntentFilter();
usbFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
usbFilter.addAction(Intent.ACTION_MEDIA_REMOVED);
usbFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
usbFilter.addDataScheme("file");
registerReceiver(usbBroadcast,usbFilter);

4. 程序退出前需要注销广播

参考链接：

https://blog.csdn.net/LJX_ahut/article/details/89672880

https://www.jianshu.com/p/42982aa8184

Android Studio升级3.6 Build窗口出现中文乱码问题解

在别的安卓机器上调试成功的代码，在另外一台机器上测试的时候，发现收到广播启动activity的时候，会出现
android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
的异常提示。网上搜了一下，发现必须设置Intent标志为FLAG_ACTIVITY_NEW_TASK。我是这样设置的：

 

Intent intentS= new Intent(getApplicationContext(), RunActivity.class);
intentS.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intentS);

设置之后重新运行，就不会抛出上面的异常了。

本文参考链接：https://willy2016.pixnet.net/blog/post/215860320-android–api-%E7%B4%9A%E5%88%A5%E5%8D%87%E7%B4%9A-28%2C-android-pie-9.0-%E9%81%87%E5%88%B0-error