Android自动播放U盘视频

在网上看到很多类似的Demo，我刚入行很多都看不懂，最后自己弄出来这个，可以自动播放视频，但是只能播放名字为"video.mp4"的视频，也是得先打开Apk再插入U盘才能跳转播放，有大佬可以指点一下怎么修改吗？

public class UsbVideo extends Activity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.usb_video);
        IntentFilter intentFilter = new IntentFilter();
        UsbBroadcastReceive usbBroadcastReceive = new UsbBroadcastReceive();
        intentFilter.addAction("android.intent.action.MEDIA_EJECT");
        intentFilter.addAction("android.intent.action.MEDIA_MOUNTED");
        intentFilter.addAction("android.intent.action.MEDIA_REMOVED");
        intentFilter.addAction("android.intent.action.MEDIA_UNMOUNTED");
        intentFilter.addDataScheme("file");
        registerReceiver(usbBroadcastReceive, intentFilter);
    }

    class UsbBroadcastReceive extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if ("android.intent.action.MEDIA_MOUNTED".equalsIgnoreCase(action)) {
                String usbPath = intent.getDataString();
                if (TextUtils.isEmpty(usbPath)) {
                    return;
                }
                usbPath = usbPath.replace("file:///", "");
                Uri videoUri = Uri.parse(usbPath + "/video.mp4");
                // 启动视频播放
                Intent startVideoIntent = new Intent(Intent.ACTION_VIEW, videoUri);
                startVideoIntent.setDataAndType(videoUri, "video/mp4");
                startVideoIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(startVideoIntent);
                return;
            } else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED) || action.equals(Intent.ACTION_MEDIA_EJECT)) {
                Log.e("TAG", "U盘移除");
                return;
            } else if (action.equals("android.intent.action.BOOT_COMPLETED")) {
                return;
            }
        }
    }
}

 <!--SD卡读写的权限-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>