主配置文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    android:sharedUserId="android.uid.system"
    package="com.ling.autoplay">
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <application>
        <activity android:name=".PlayActivity"
        android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".BootBroadReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </receiver>
    </application>
</manifest>

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <VideoView
        android:id="@+id/videoView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

广播接收器：

public class BootBroadReceiver extends BroadcastReceiver {
    public static final String ACTION = "android.intent.action.BOOT_COMPLETED";
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(ACTION)) {
            Log.i("PlayActivity", "onReceive");
            Intent playIntent = new Intent(context, PlayActivity.class);
            playIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(playIntent);
        }
    }
}

播放视频的界面：

public class PlayActivity extends Activity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_play);
        VideoView vv = (VideoView)this.findViewById(R.id.videoView);
        String uri = "android.resource://" + getPackageName() + "/" + R.raw.output;
        vv.setVideoURI(Uri.parse(uri));
        vv.start();
        vv.setOnPreparedListener(mp -> {
            mp.start();
            mp.setLooping(true);
        });
//另一种方式
//        vv.setOnCompletionListener(mp -> {
//           vv.setVideoURI(Uri.parse(uri));
//            vv.start();
//        });
    }
}