android 仿QQ动态背景、视频背景的示例代码

 public class CustomVideoView extends VideoView {

  public CustomVideoView(Context context) {
    super(context);
  }

  public CustomVideoView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public CustomVideoView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    //我们重新计算高度
    int width = getDefaultSize(0, widthMeasureSpec);
    int height = getDefaultSize(0, heightMeasureSpec);
    setMeasuredDimension(width, height);
  }

  @Override
  public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
    super.setOnPreparedListener(l);
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    return super.onKeyDown(keyCode, event);
  }
}

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private CustomVideoView videoview;
    private Button  btn_enter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      // requestWindowFeature(Window.FEATURE_NO_TITLE);
      setContentView(R.layout.activity_main);
      initView();
    }

    /**
     * 初始化
     */
    private void initView() {
      btn_enter = (Button) findViewById(R.id.btn_enter);
      btn_enter.setOnClickListener(this);

      videoview = (CustomVideoView) findViewById(R.id.videoview);
      videoview.setVideoURI(Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.shipin2));

      //播放
      videoview.start();
      //循环播放
      videoview.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer) {
          videoview.start();
          mediaPlayer.setOnInfoListener(new MediaPlayer.OnInfoListener() {
            @Override
            public boolean onInfo(MediaPlayer mp, int what, int extra) {
              return false;
            }
          });
        }
      });

    }

    @Override
    public void onClick(View view) {
      switch (view.getId()){
        case R.id.btn_enter:
          Toast.makeText(this,"登录成功了",Toast.LENGTH_SHORT).show();
          break;
      }
    }

    //返回重启加载
    @Override
    protected void onRestart() {
      super.onRestart();
      initView();
    }

    //防止锁屏或者切出的时候，音乐在播放
    @Override
    protected void onStop() {
      super.onStop();
      videoview.stopPlayback();
    }
  }