Android绘制圆角图片

public class PhotoTestActivity extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

ImageView image = (ImageView)findViewById(R.id.image);

Bitmap photo = BitmapFactory.decodeResource(getResources(), R.drawable.test);

image.setImageBitmap(createFramedPhoto(500,400,photo,50));

}





/**

*

* @param x 图像的宽度

* @param y 图像的高度

* @param image 源图片

* @param outerRadiusRat 圆角的大小

* @return 圆角图片

*/

Bitmap createFramedPhoto(int x, int y, Bitmap image, float outerRadiusRat) {

//根据源文件新建一个darwable对象

Drawable imageDrawable = new BitmapDrawable(image);





// 新建一个新的输出图片

Bitmap output = Bitmap.createBitmap(x, y, Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(output);





// 新建一个矩形

RectF outerRect = new RectF(0, 0, x, y);





// 产生一个红色的圆角矩形

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);

paint.setColor(Color.RED);

canvas.drawRoundRect(outerRect, outerRadiusRat, outerRadiusRat, paint);





// 将源图片绘制到这个圆角矩形上

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

imageDrawable.setBounds(0, 0, x, y);

canvas.saveLayer(outerRect, paint, Canvas.ALL_S***E_FLAG);

imageDrawable.draw(canvas);

canvas.restore();





return output;

}

}