Android裁剪画布构造圆形图片

圆形图片

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

public class CustomCircleView extends View{

    private Bitmap bitmap;
    private Paint mPaint;
    private Path mPath;

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

    public CustomCircleView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomCircleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        setLayerType(LAYER_TYPE_SOFTWARE,null);
        bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.icon_mobile);
        mPaint = new Paint();
        mPath = new Path();
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        mPath.addCircle(width/2,height/2,width/2,Path.Direction.CCW);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.save();
        canvas.clipPath(mPath);
        canvas.drawBitmap(bitmap,0,0,mPaint);
        canvas.restore();
    }
}