Android - 在视频上创建圆形蒙版

Question

我对 Android 开发比较陌生，我想知道是否可以将 VideoView 屏蔽为形状。这是我目前所拥有的：

预期结果

用于视频查看和布局的 XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#0088ff"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".VideoPlayerActivity" >

    <FrameLayout
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="@drawable/circular_mask"
        android:foreground="@drawable/circular_mask" >

        <VideoView
            android:id="@+id/videoView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:fitsSystemWindows="false"
            android:focusable="false"
            android:focusableInTouchMode="false"
            android:scrollbarAlwaysDrawVerticalTrack="false" />

        <Space
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </FrameLayout>

</RelativeLayout>

面具形状xml：

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="20dp"
    android:shape="oval" >

    <solid android:color="#FFFFFFFF" />

    <corners android:radius="10dp" />

</shape>

主java：

package com.example.webmvideo;

import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.view.Menu;
import android.widget.MediaController;
import android.widget.VideoView;
import android.util.Log;
import android.media.MediaPlayer;

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MainActivity extends Activity {

    Uri srcPath = Uri.parse("android.resource://com.example.webmvideo/" + R.raw.test);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final VideoView videoView = (VideoView) 
                findViewById(R.id.videoView1);

        videoView.setVideoURI(srcPath);

        MediaController mediaController = new MediaController(this);
        mediaController.setAnchorView(videoView);
        videoView.setMediaController(mediaController);

        videoView.setOnPreparedListener(new 
                MediaPlayer.OnPreparedListener()  {
            @Override
            public void onPrepared(MediaPlayer mp) {                         
                String TAG = null;
                Log.i(TAG , "Duration = " + videoView.getDuration());
            }
        });     
        videoView.start();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

Answer 1

原来可以将视频剪辑成一个圆圈。你要做的是创建你自己的 SurfaceView 类并覆盖 dispatchDraw 从这里你可以调用 canvas.clipPath 并传入Path 对象，其中包含您希望将视频遮盖到的圆圈。

这是视图：

public class CircleSurface extends SurfaceView {

    private Path clipPath;

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

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

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

    private void init() {
        clipPath = new Path();
        //TODO: define the circle you actually want
        clipPath.addCircle(710, 330, 250, Path.Direction.CW);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.clipPath(clipPath);
        super.dispatchDraw(canvas);
    }
}

这是活动的样子

public class MainActivity extends Activity implements SurfaceHolder.Callback {

    CircleSurface surface;
    MediaPlayer player;

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

        surface = (CircleSurface) findViewById(R.id.surface);
        SurfaceHolder holder = surface.getHolder();
        holder.addCallback(this);

        player = MediaPlayer.create(this, R.raw.yourvideo);
    }


    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        player.setDisplay(holder);
        player.start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        //TODO: handle this
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        //TODO: handle this
    }
}

Answer 2

我以前做过类似这个面具的事情。您可以按照以下步骤获得所需的内容
1）准备一个你想要的形状的png图像，并用颜色0x0000000填充它
2) 使用空白布局并确保它覆盖 VideView
3) 现在，所有的触摸事件都被这个空白布局捕获
4）判断TouchEvent中包含的点的颜色，如果颜色为0x00000000则将事件传递给VideView

这是一个获取点颜色的示例，它运行有效：

// build a drawingCache and draw the mask layer to the bitmap
        Bitmap drawingCache = Bitmap.createBitmap(getWidth(), getHeight(),Bitmap.Config.ARGB_4444);
        Canvas drawingCacheCanvas = new Canvas(drawingCache);
        drawingCacheCanvas.clipRect(x, y, x + 1, y + 1); 
        draw(drawingCacheCanvas);

        int color = drawingCache.getPixel(x, y);

        if (color == getMaskColor()) { 
            //TODO dispatch event to VideoView and let it to handle event
        }