java - 视频确实在 Android 模拟器中显示

Question

当我运行项目时，视频不显示。我还在文件浏览 -> mnt -> sdcard -> a.mp4 中推送 a.mp4 文件，但运行项目时视频仍然无法播放。请任何人帮助我下面的代码哪里有错误。

    public class MainActivity extends Activity {

    VideoView video_player_view;
    SurfaceView sur_view;
    MediaController media_controller;
    DisplayMetrics dm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void getInit()
    {
        video_player_view = (VideoView)findViewById(R.id.videoView1);
        media_controller = new MediaController(this);
        dm = new DisplayMetrics();      
        this.getWindowManager().getDefaultDisplay().getMetrics(dm);
        int height = dm.heightPixels;
        int width = dm.heightPixels;
        video_player_view.setMinimumHeight(height);
        video_player_view.setMinimumWidth(width);
        video_player_view.setMediaController(media_controller);
        video_player_view.setVideoPath("/mnt/sdcard/a.mp4");
        video_player_view.start();  
    }
}

Answer 1

你没有调用getInit()方法

    public class MainActivity extends Activity {

    VideoView video_player_view;
    SurfaceView sur_view;
    MediaController media_controller;
    DisplayMetrics dm;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);\
   getInit();
    }

  public void getInit()
    {
  video_player_view = (VideoView)findViewById(R.id.videoView1);
  media_controller = new MediaController(this);
  dm = new DisplayMetrics();      
  this.getWindowManager().getDefaultDisplay().getMetrics(dm);
  int height = dm.heightPixels;
  int width = dm.heightPixels;
  video_player_view.setMinimumHeight(height);
  video_player_view.setMinimumWidth(width);
  video_player_view.setMediaController(media_controller);
  video_player_view.setVideoPath("/mnt/sdcard/a.mp4");
  video_player_view.start();  
   }
  }

模拟器在播放某些视频时确实存在问题，因此我始终在实际设备上进行所有视频测试。当视频在模拟器上运行时，它通常充其量非常慢(1fps，偏移声音)。