自定义ImageView 圆角shape

/**

 *

 * 转载请标明出处：http://blog.csdn.net/u013598111/article/details/50256847

 *   @author：【JunTao_sun】
 *

 *

*/



package com.example.imageview;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.animation.Animation;
import android.widget.ImageView;
import android.widget.OverScroller;

public class CustomView extends ImageView {

private static final String TAG = null;
private Paint mPaint;
private Bitmap bitmap;

public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setDither(true);
mPaint.setColor(0xff0000ff);
// OverScroller
}

private void drawBitmap(Bitmap src) {
//关闭硬件加速
setLayerType(LAYER_TYPE_SOFTWARE, null);

bitmap = Bitmap.createBitmap(src.getWidth(), src.getHeight(),
Config.ARGB_8888);
Canvas c = new Canvas();

c.setBitmap(bitmap);

// Dst 圆矩形
c.drawRoundRect(new RectF(0, 0, getWidth(), getHeight()), 20, 20,
mPaint);

mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
// src
c.drawBitmap(src, 0, 0, mPaint);

}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// TODO Auto-generated method stub
super.onSizeChanged(w, h, oldw, oldh);

BitmapDrawable bd = (BitmapDrawable) getDrawable();
Bitmap mBitmap = bd.getBitmap();
float rate = Math.max(getWidth() * 1.0f / mBitmap.getWidth(),
getWidth() * 1.0f / mBitmap.getHeight());
// mBitmap.setWidth((int) (rate*mBitmap.getWidth())); 不能直接设置
// mBitmap.setHeight((int) (rate*mBitmap.getHeight()));
// 缩小图片
mBitmap = Bitmap.createScaledBitmap(mBitmap,
(int) (rate * mBitmap.getWidth()),
(int) (rate * mBitmap.getHeight()), true);

drawBitmap(mBitmap);

}
.

@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(bitmap, 0, 0, null);

}

}