Android圓角圖片封裝類

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;

/**

圓角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();  

}


}  </pre>