Android VideoView crop_center

Question

我有一个RelativeLayout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    android:foregroundGravity="center"
    android:gravity="center"
    android:orientation="horizontal" >

    <VideoView
        android:id="@+id/videoViewPanel"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center" 
        android:layout_centerInParent="true"/>

</RelativeLayout>

我需要的是显示全屏幕裁剪的视频。如果我可以与ImageView进行比较，我需要将它显示为crop_center。

我如何使VideoView不是自动调整视频大小以适应中心，而是作物中心？

Answer 1

解决方案是使用TextureView而不是VideoView(SurfaceView)。

TextureView不对内容进行任何操作以使其适合屏幕。

下面是解决方案的代码示例：

//store the SurfaceTexture to set surface for MediaPlayer
mTextureView.setSurfaceTextureListener(new SurfaceTextureListener() {
@Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface,
            int width, int height) {
        FullScreenActivity.this.mSurface = surface;

    }

……

Surface s = new Surface(mSurface);
mPlayer = mp;
mp.setSurface(s);

scaleVideo(mp);//<-- this function scales video to run cropped

……

private void scaleVideo(MediaPlayer mPlayer) {

        LayoutParams videoParams = (LayoutParams) mTextureView
                .getLayoutParams();
        DisplayMetrics dm = new DisplayMetrics();
        FullScreenActivity.this.getWindowManager().getDefaultDisplay()
                .getMetrics(dm);

        final int height = dm.heightPixels;
        final int width = dm.widthPixels;
        int videoHeight = mPlayer.getVideoHeight();
        int videoWidth = mPlayer.getVideoWidth();
        double hRatio = 1;

        hRatio = (height * 1.0 / videoHeight) / (width * 1.0 / videoWidth);
        videoParams.x = (int) (hRatio <= 1 ? 0 : Math.round((-(hRatio - 1) / 2)
                * width));
        videoParams.y = (int) (hRatio >= 1 ? 0 : Math
                .round((((-1 / hRatio) + 1) / 2) * height));
        videoParams.width = width - videoParams.x - videoParams.x;
        videoParams.height = height - videoParams.y - videoParams.y;
        Log.e(TAG, "x:" + videoParams.x + " y:" + videoParams.y);
        mTextureView.setScaleX(1.00001f);//<-- this line enables smoothing of the picture in TextureView.
        mTextureView.requestLayout();
        mTextureView.invalidate();

    }

Answer 2

在Android的VideoView中，有一种简单而简单的方法可以实现与ImageView.ScaleType.CENTER_CROP相同的效果

xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <VideoView
        android:id="@+id/videoView"
        android:layout_width="@dimen/dimen_0dp"
        android:layout_height="@dimen/dimen_0dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

在JAVA中：

videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
   @Override
   public void onPrepared(MediaPlayer mp) {
         float videoRatio = mp.getVideoWidth() / (float) mp.getVideoHeight();
         float screenRatio = videoView.getWidth() / (float) 
         videoView.getHeight();
         float scaleX = videoRatio / screenRatio;
         if (scaleX >= 1f) {
             videoView.setScaleX(scaleX);
         } else {
             videoView.setScaleY(1f / scaleX);
         }
      }
});

在科特林：

videoView.setOnPreparedListener { mediaPlayer ->
    val videoRatio = mediaPlayer.videoWidth / mediaPlayer.videoHeight.toFloat()
    val screenRatio = videoView.width / videoView.height.toFloat()
    val scaleX = videoRatio / screenRatio
    if (scaleX >= 1f) {
        videoView.scaleX = scaleX
    } else {
        videoView.scaleY = 1f / scaleX
    }
}

这对我来说很管用。希望这能帮上忙。

Answer 3

我只是把视频放进ConstraintLayout里面，里面有这样的参数。这有助于拉伸视频和实现android:scaleType="centerCrop"效果。

<VideoView
    android:id="@+id/video_view"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_gravity="center_horizontal"
    android:layout_width="0dp"
    android:layout_height="0dp" />