Android 视频视图crop_center

问题描述 投票：0回答：7

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>

我需要的是全屏显示裁剪后的视频。如果我可以与 ImageView 进行比较，我需要将其显示为crop_center。

如何使 VideoView 不自动调整视频大小以适合中心，而是裁剪中心？

android android-videoview aspect-ratio
7个回答
31
投票

在Android的VideoView中，这里有一个简单易行的方法，可以达到与

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 Kotlin 中：

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
    }
}

这对我有用。希望这会对某人有所帮助。

11
投票

解决方案是使用 

TextureView
代替 
VideoView
(
SurfaceView
)。
TextureView
不会对内容进行任何操作以使其适合屏幕。
这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();

    }
2
投票

要全屏裁剪中心，您仍然可以使用 VideoView。设置VideoView的宽度和高度以匹配RelativeLayout中的父级，并将其调整为大于屏幕并设置其位置。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rootLayout"
tools:context="com.example.Activity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_height="match_parent">

        <VideoView
            android:id="@+id/video_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerInParent="true"
            android:layout_centerVertical="true" />

    </RelativeLayout>
</RelativeLayout>

然后在onCreate中：

   RelativeLayout rootView=(RelativeLayout) findViewById(R.id.rootLayout);
    Display display=getWindowManager().getDefaultDisplay();
    Point size=new Point();
    display.getSize(size);

    FrameLayout.LayoutParams rootViewParams = (FrameLayout.LayoutParams) rootView.getLayoutParams();
    int videoWidth=864;
    int videoHeight=1280;

    if ((float)videoWidth/(float)videoHeight<(float)size.x/(float)size.y) {
        rootViewParams.width=size.x;
        rootViewParams.height=videoHeight*size.x/videoWidth;
        rootView.setX(0);
        rootView.setY((rootViewParams.height-size.y)/2*-1);
    } else {
        rootViewParams.width=videoWidth*size.y/videoHeight;
        rootViewParams.height=size.y;
        rootView.setX((rootViewParams.width-size.x)/2*-1);
        rootView.setY(0);
    }
    rootView.setLayoutParams(rootViewParams);


    final VideoView mVideoView=(VideoView)findViewById(R.id.video_view);
    mVideoView.setVideoURI(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.splash));
    mVideoView.requestFocus();

    mVideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mediaPlayer) {
            mVideoView.start();
        }
    });
2
投票

我只是将视频放入

ConstraintLayout
中并带有这样的参数。这有助于拉伸视频并实现
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" />
0
投票

我找到了一个解决方案：默认行为就像 

fitCenter
，所以我计算视频比例（宽度/高度）和屏幕比例，然后将 
VideoView
缩放到全屏。结果就像
centerCrop
一样。

0
投票

添加@Nabin 的回答。如果您在暂停时遇到问题。 如果视频暂停导致视频视图高度发生变化并显示下方黑屏。用这个。

public class CustomVideoView extends VideoView {
private int originalWidth = 0;
private int originalHeight = 0;

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

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

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

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if (originalWidth == 0 || originalHeight == 0) {
        originalWidth = MeasureSpec.getSize(widthMeasureSpec);
        originalHeight = MeasureSpec.getSize(heightMeasureSpec);
    }

    setMeasuredDimension(originalWidth, originalHeight);
}

}

0
投票

就我而言，我知道 screenRatio > videoRatio 并且我需要制作圆角。我的解决方案只是设置高度wrap_content和宽度match_parent：

<com.google.android.material.card.MaterialCardView
    android:id="@+id/mcv_video"
    android:layout_width="0dp"
    android:layout_height="130dp"
    app:cardCornerRadius="12dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

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

</com.google.android.material.card.MaterialCardView>
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