视频未在android中播放

Question

用我的代码，我试图在登录屏幕上播放视频。我已经导入了mp4视频文件。但是，当我运行此代码视频时，它不会出现在屏幕上。实际上该视频文件显示为??标志 。我需要添加其他任何东西来播放视频吗？请帮助

 <VideoView
        android:id="@+id/videoView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
         />

//下面的Java代码

public VideoView videoView;public MediaPlayer mediaPlayer;

@OnClick(R.id.email_sign_in_button)
void delegateLogin() {
    progressBar.setVisibility(View.VISIBLE);
   loginPresenter.doLogin(usernameInput.getText().toString(), passwordInput.getText().toString());
}

@OnClick(R.id.register_now_button)
void registerNow(){
    loginPresenter.doOpenRegisterScreen(this);
}

@OnClick(R.id.forgot_password_button)
void forgotPassword(){
    loginPresenter.doOpenForgotPasswordScreen(this);
}


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    ButterKnife.bind(this);

    videoView=(VideoView)findViewById(R.id.videoView1);

    Uri uri= Uri.parse("android.resource://"
    +getPackageName()
    +"/"
    +R.raw.mt_launch_screen);

    videoView.setVideoURI(uri);
   // videoView.requestFocus();
    videoView.start();

    videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mediaPlayer) {
            mediaPlayer.setLooping(true);
           // mediaPlayer.start();
        }
    });

Answer 1

查看Android的文档：https://developer.android.com/guide/topics/media/mediaplayer#java

您需要使用MediaPlayer中的onCreate做一些事情>

Uri uri= Uri.parse("android.resource://"
        +getPackageName()
        +"/"
        +R.raw.mt_launch_screen);

mediaPlayer = MediaPlayer.create(context, uri);
mediaPlayer.start(); // no need to call prepare(); create() does that for you