Android - Creating a circular mask on video

Question

I'm relatively new to Android development, and I was wondering if it's possible to mask a VideoView into a shape. This is what I have so far:

Expected Result

My XML for video view and layout:

<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>

Mask shape 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>

Main 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

Turns out it is possible to clip a video into a circle. What you're going to want to do is create your own SurfaceView class and override dispatchDraw from here you can call canvas.clipPath and pass in a Path object that contains the circle you want the video to be masked to.

Here's the view:

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);
    }
}

Here's what the activity might look like

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
    }
}