圆形图片

imageview一般情况下为矩形，如果需要现实为圆角或者圆形还需要进行一番处理，这里自定义了一个imageview，可以修改角度来显示圆角图片

  1 import android.content.Context;

  2 import android.graphics.Bitmap;

  3 import android.graphics.Bitmap.Config;

  4 import android.graphics.Canvas;

  5 import android.graphics.Paint;

  6 import android.graphics.PorterDuff.Mode;

  7 import android.graphics.PorterDuffXfermode;

  8 import android.graphics.Rect;

  9 import android.graphics.RectF;

 10 import android.util.AttributeSet;

 11 import android.widget.ImageView;

 12 

 13 /**

 14 *  类名 CircleImageView

 15 *  @author 王洪贺<br/>

 16 *    圆形图像类

 17 *    创建日期 2014年7月14日

 18 */

 19 public class CircleImageView extends ImageView {

 20 

 21     /**默认显示的图像*/

 22     private int defaultImageRes = R.drawable.no_image;

 23     /**网络图像地址*/

 24     private String url;

 25     /**上下文*/

 26     private Context mContext;

 27 

 28     public CircleImageView(Context context) {

 29         super(context);

 30         init(context);

 31     }

 32 

 33     public CircleImageView(Context context, AttributeSet attrs, int defStyle) {

 34         super(context, attrs, defStyle);

 35         init(context);

 36     }

 37 

 38     public CircleImageView(Context context, AttributeSet attrs) {

 39         super(context, attrs);

 40         init(context);

 41     }

 42 

 43     public void init(Context context) {

 44         this.mContext = context;

 45     }

 46 

 47     public void setDefault(int resId) {

 48         defaultImageRes = resId;

 49     }

 50 

 51     public void setUrl(String imageUrl) {

 52         url = imageUrl;

 53     }

 54 

 55     @Override

 56     public void setImageBitmap(Bitmap bm) {

 57         if (bm != null) {

 58             bm = toRoundBitmap(bm);

 59             // bitmap = bm;

 60         }

 61         super.setImageBitmap(bm);

 62     }

 63 

 64     @Override

 65     public void setImageResource(int resId) {

 66         super.setImageResource(resId);

 67 

 68     }

 69 

 70     /**

 71      * 转换图片成圆形

 72      * 

 73      * @param bitmap

 74      *            传入Bitmap对象

 75      * @return

 76      */

 77     public Bitmap toRoundBitmap(Bitmap bitmap) {

 78 

 79         Bitmap output = Bitmap

 80                 .createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);

 81         Canvas canvas = new Canvas(output);

 82 

 83         final int color = 0xff424242;

 84         final Paint paint = new Paint();

 85         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

 86         final RectF rectF = new RectF(rect);

 87         final float roundPx = 90;

 88 

 89         paint.setAntiAlias(true);

 90         canvas.drawARGB(0, 0, 0, 0);

 91         paint.setColor(color);

 92         canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

 93 

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

 95         canvas.drawBitmap(bitmap, rect, rect, paint);

 96 

 97         return output;

 98     }

 99 

100 }