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 }