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【Java】 Android圆角图片封装类

作者:Staryong / 发布于2013/11/28/ 480

package com.phodev.andtools.widget;

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;

/**
* 圆角ImageView
*
* @author skg
*
*/
public class RoundImageView extends ImageView {

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

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

 private final RectF roundRect = new RectF();
 private float rect_adius = 6;
 private final Paint maskPaint = new Paint();
 private final Paint zonePaint = new Paint();

 private void init() {
  maskPaint.setAntiAlias(true);
  maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
  //
  zonePaint.setAntiAlias(true);
  zonePaint.setColor(Color.WHITE);
  //
  float density = getResources().getDisplayMetrics().density;
  rect_adius = rect_adius * density;
 }

 public void setRectAdius(float adius) {
  rect_adius = adius;
  invalidate();
 }

 @Override
 protected void onLayout(boolean changed, int left, int top, int right,
   int bottom) {
  super.onLayout(changed, left, top, right, bottom);
  int w = getWidth();
  int h = getHeight();
  roundRect.set(0, 0, w, h);
 }

 @Override
 public void draw(Canvas canvas) {
  canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
  canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
  //
  canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
  super.draw(canvas);
  canvas.restore();
 }

}

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