Question

我最初隐藏了VideoView，当视频加载时，我正在显示VideoView。但如果onPrepared最初为VideoView，则永远不会调用invisible。但是，如果onPrepared可见，则VideoView会被正确调用。有没有办法隐藏videoView，直到加载视频。任何帮助，将不胜感激。谢谢！

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >


<VideoView
        android:id="@+id/video"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:visibility="invisible" />

</RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        VideoView videoView = (VideoView) findViewById(R.id.video);
        Uri videoUri = Uri.parse(url);
        videoView.setVideoURI(videoUri);
        videoView.requestFocus();

        videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {
                Toast.makeText(mActivity, "on prepared", Toast.LENGTH_SHORT).show();


                 videoView.setVisibility(View.VISIBLE);


            }
        });


}

Answer 1

您可以尝试将视频视图的Alpha通道设置为0或接近0。

Answer 2

解决了它使其布局不可见而不是videoView本身。感谢@ J.Kowalski。

布局：

<FrameLayout
    android:id="@+id/layout_video_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <VideoView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:scrollbars="none"/>
</FrameLayout>

<ProgressBar
    android:id="@+id/progress"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:visibility="gone"
    />

设置OnPreparedListener：

videoView.setOnPreparedListener(this);

准备好之前显示进度条：

@Override
public void showProgress() {
    progress.setVisibility(View.VISIBLE);
    layoutVideoView.setVisibility(View.INVISIBLE);
}

加载视频URI：

@Override
public void loadVideo(Uri uri) {
    videoView.setVideoURI(uri);
}

当它准备就绪时，onPrepared被称为：

@Override
public void onPrepared(MediaPlayer mp) {
    Log.d("debug", "onPrepared");
    iStepPreviewPresenter.onVideoViewReady();
}

最后展示布局并开始播放视频：

@Override
public void hideProgress() {
    progress.setVisibility(View.INVISIBLE);
    layoutVideoView.setVisibility(View.VISIBLE);
}

@Override
public void startVideo() {
    videoView.start();
}

Nailed it！

Answer 3

可以通过其中一个技巧来实现

您可以将VideoView的高度和宽度设置为1px，直到视频准备好，然后通过将属性更改为match parent来切换到全屏

正如@FDIM在他的回答中所说，我们可以将视图的alpha值设置为0，直到准备好视频。但只有在我们使用TextureView加载视频时才有效。它不适用于普通VideoView。这是一个扩展TextureView的自定义VideoView，它模仿默认的VideoVideo实现。此类可以直接在xml文件中使用，并可以将alpha设置为0以隐藏视频。

public class TextureVideoView extends TextureView  implements SurfaceTextureListener                {

private MediaPlayer mMediaPlayer;

public TextureVideoView(Context context) {
    super(context);
    init();
}

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

private void init() {
    mMediaPlayer = new MediaPlayer();
    this.setSurfaceTextureListener(this);
}

public void seekTo(int msec) {
    mMediaPlayer.seekTo(msec);
}

public void setVideoPath(final String path) throws IOException {
    mMediaPlayer.reset();
    mMediaPlayer.setDataSource(path);
    mMediaPlayer.prepare();
}

public void setVideoPath(FileDescriptor fd, long offset, long length) throws IOException {
    mMediaPlayer.reset();
    mMediaPlayer.setDataSource(fd, offset, length);
    mMediaPlayer.prepare();
}

public void setVideoURI(Context context, Uri uri) throws IOException {
    mMediaPlayer.reset();
    mMediaPlayer.setDataSource(context, uri);
}

public void setOnPreparedListener(OnPreparedListener onPreparedListener) {
    mMediaPlayer.setOnPreparedListener(onPreparedListener);
}

public void setOnCompletionListener(OnCompletionListener onCompletionListener) {
    mMediaPlayer.setOnCompletionListener(onCompletionListener);
}

public void setOnErrorListener(OnErrorListener onErrorListener) {
    mMediaPlayer.setOnErrorListener(onErrorListener);
}

public void start() {
    mMediaPlayer.start();
}

public void pause() {
    mMediaPlayer.pause();
}

public void setVolume(float leftVolume, float rightVolume ) {
    mMediaPlayer.setVolume(leftVolume, rightVolume);
}

public boolean isPlaying() {
    return mMediaPlayer.isPlaying();
}

public void stopPlayback() {
    mMediaPlayer.stop();
}

public void reset() {
    mMediaPlayer.reset();
}

public void release() {
    mMediaPlayer.release();
}


@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
        int height) {

    mMediaPlayer.setSurface(new Surface(surface));
}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
    return false;
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,
        int height) {

}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}

Answer 4

更简单的解决方法：

只需为parentview添加虚假videoview，并为visiblity设置parentview，而不是更改visibility的{{1}}本身。

如果VideoView不可见，则不会调用VideoView onPrepared

4 个答案: