圆角图片RoundCornerImageView

package com.sclgxt.customimageview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.ImageView;

/**  * Created by Sclgxt on 2016/5/5.  * Mind:圆角图片,如果不是wrapcontent,请注意加上这句话android:scaleType="centerCrop",防止图片撑不起来而留有空白
;请注意setRoundCorner.
 */public class RoundCornerImageView extends ImageView {    private Paint roundPaint;    private Paint maskPaint;    private int size = 0;    public RoundCornerImageView(Context context) {        this(context, null);    }    public RoundCornerImageView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public RoundCornerImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);        init();    }    private void init() {        roundPaint = new Paint();        roundPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));        roundPaint.setAntiAlias(true);        roundPaint.setColor(Color.WHITE);        maskPaint = new Paint();        maskPaint.setAntiAlias(true);        maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));    }    @Override    protected void onDraw(Canvas canvas) {        canvas.saveLayer(0, 0, getWidth(), getHeight(), roundPaint, Canvas.ALL_SAVE_FLAG);        canvas.drawRoundRect(new RectF(0, 0, getWidth(), getHeight()), size, size, roundPaint);        canvas.saveLayer(0, 0, getWidth(), getHeight(), maskPaint, Canvas.ALL_SAVE_FLAG);        super.onDraw(canvas);    }    //设置圆角大小.这是一种写法,当然也可以自定义属性咯 public void setRoundCorner(int size) {        this.size = size;    }

}