在VideoView中定位视频

Question

所以我扩展了VideoView的onMeasure以扩展视频以适应全屏视图.

这是如何:

public void setVideoAspect(int w,int h){
    wVideo=w;
    hVideo=h;
    onMeasure(w, h);
}
 @Override
 protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
 {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     if(wVideo!=0 && hVideo!=0)
     setMeasuredDimension(wVideo,hVideo);
 }

我使用屏幕的显示指标(宽度,高度)调用setVideoAspect().问题是这种方法会拉伸视频以适应屏幕内部.我希望能够保持纵横比.(我有4:3的视频和3:2的屏幕尺寸.)我使用下面的代码给视图保留比率测量值:

int height =  (int) (metrics.widthPixels*3/(float)4);
                        int width=  metrics.widthPixels;   
                        mVideoView.setVideoAspect(width,height);

所以这可以完成这项工作,但是有一个问题:它给了我一个4:3的视频,屏幕的宽度和正确的比例,但它不会使视频居中.(它只是播放视频的底部而不是顶部和底部.)我有一个包含VideoView的相对布局,VideoView的重力设置为居中.

Answer 1

尝试使用FrameLayout替代品.我不确定为什么,但是如果我在我的代码中使用Linear或者Relative它不会居中,但FrameLayout确实如此.这是适合我的视频到屏幕的XML,保留比率并使其居中:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg">
    <!-- Video player -->
    <VideoView
        android:id="@+id/surface_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"/>
</FrameLayout>

Answer 2

为了将视频置于RelativeLayout中心,我添加了两个layout_gravity="center"广告layout_centerInParent="true".它适用于我的Android 4.3手机.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <VideoView android:id="@+id/surface_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_centerInParent="true" />
</RelativeLayout>

Answer 3

Cameron以程序化的方式回答(如果像我这样的人需要它)这段代码在我的代码中的一个活动的创建内部('this'在下面指的是活动)

    FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
            LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);

    FrameLayout fl = new FrameLayout(this);

    fl.setLayoutParams(lp);

    VideoView vv = new VideoView(this);

    FrameLayout.LayoutParams lp2 = new FrameLayout.LayoutParams(lp);

    lp2.gravity = Gravity.CENTER;

    vv.setLayoutParams(lp2);

    fl.addView(vv);

    setContentView(fl);

Answer 4

这适用于任何保持视频长宽比的视频。它将视频放置在VideoView内部，并像ImageView一样执行“中心裁剪”或“内部中心”。

我正在使用VideoView覆盖整个ConstraintLayout。您可以将任何其他布局与match_parent一起用作宽度和高度。

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <VideoView
        android:id="@+id/videoView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

在onCreate中：

Uri uri = //The uri of your video.
VideoView videoView = findViewById(R.id.videoView);
videoView.setVideoURI(uri);
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {

        //Get your video's width and height
        int videoWidth = mp.getVideoWidth();
        int videoHeight = mp.getVideoHeight();

        //Get VideoView's current width and height
        int videoViewWidth = videoView.getWidth();
        int videoViewHeight = videoView.getHeight();

        float xScale = (float) videoViewWidth / videoWidth;
        float yScale = (float) videoViewHeight / videoHeight;

        //For Center Crop use the Math.max to calculate the scale
        //float scale = Math.max(xScale, yScale);
        //For Center Inside use the Math.min scale. 
        //I prefer Center Inside so I am using Math.min
        float scale = Math.min(xScale, yScale);

        float scaledWidth = scale * videoWidth;
        float scaledHeight = scale * videoHeight;

        //Set the new size for the VideoView based on the dimensions of the video
        ViewGroup.LayoutParams layoutParams = videoView.getLayoutParams();
        layoutParams.width = (int)scaledWidth;
        layoutParams.height = (int)scaledHeight;
        videoView.setLayoutParams(layoutParams);               
    }
 });

希望它能对某人有所帮助！