图片圆角处理

package com.storm.ui;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.PorterDuff.Mode;

import android.graphics.PorterDuffXfermode;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.widget.ImageView;

/**

 * 圆角图片

 *

 * @author Chao

 * */
public class RoundedCornerImageView extends ImageView {
private final float density = getContext().getResources()

                        .getDisplayMetrics().density;

        private float roundness;
public RoundedCornerImageView(Context context) {

                super(context);
init();

        }
public RoundedCornerImageView(Context context, AttributeSet attrs) {

                super(context, attrs);
init();

        }
public RoundedCornerImageView(Context context, AttributeSet attrs,

                        int defStyle) {

                super(context, attrs, defStyle);
init();

        }
@Override

        public void draw(Canvas canvas) {

                final Bitmap composedBitmap;

                final Bitmap originalBitmap;

                final Canvas composedCanvas;

                final Canvas originalCanvas;

                final Paint paint;

                final int height;

                final int width;
width = getWidth();
height = getHeight();
composedBitmap = Bitmap.createBitmap(width, height,

                                Bitmap.Config.ARGB_8888);

                originalBitmap = Bitmap.createBitmap(width, height,

                                Bitmap.Config.ARGB_8888);
composedCanvas = new Canvas(composedBitmap);

                originalCanvas = new Canvas(originalBitmap);
paint = new Paint();

                paint.setAntiAlias(true);

                paint.setColor(Color.BLACK);
super.draw(originalCanvas);
composedCanvas.drawARGB(0, 0, 0, 0);
composedCanvas.drawRoundRect(new RectF(0, 0, width, height),

                                this.roundness, this.roundness, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
composedCanvas.drawBitmap(originalBitmap, 0, 0, paint);
canvas.drawBitmap(composedBitmap, 0, 0, new Paint());

        }
public float getRoundness() {

                return this.roundness / this.density;

        }
public void setRoundness(float roundness) {

                this.roundness = roundness * this.density;

        }

        private void init() {

                setRoundness(5);

        }

}

图片圆角处理