实现Android图片圆角（转载）

1./**
2. * 将图片设置为圆角
3. */
4.public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
5. Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
6. bitmap.getHeight(), Config.ARGB_8888);
7. Canvas canvas = new Canvas(output);
8. final int color = 0xff424242;
9. final Paint paint = new Paint();
10. final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
11. final RectF rectF = new RectF(rect);
12. final float roundPx = pixels;
13. paint.setAntiAlias(true);
14. canvas.drawARGB(0, 0, 0, 0);
15. paint.setColor(color);
16. canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
17. paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
18. canvas.drawBitmap(bitmap, rect, rect, paint);
19. return output;
20.}

当我们需要圆角的时候，调用这个方法，第一个参数是传入需要转化成圆角的图片，第二个参数是圆角的度数，数值越大，圆角越大

下面举个例子，有一个LinearLayout，想把它的背景图片设置成圆角

布局文件main.xml

1.<?xml version="1.0" encoding="utf-8"?>
2.<LinearLayout
3. xmlns:android=""
4. android:id="@+id/layout" android:orientation="vertical"
5. android:layout_width="wrap_content"
6. android:layout_height="wrap_content">
7.</LinearLayout>

1.mInflater = LayoutInflater.from(this);
2.
3.Drawable drawable = getResources().getDrawable(R.drawable.icon);
4.BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
5.Bitmap bitmap = bitmapDrawable.getBitmap();
6.
7.View view = mInflater.inflate(
8. R.layout.share_xiaohua_revert_lv_item_top, null);
9.ImageView mImageView = (ImageView) view
10. .findViewById(R.id.lv_xiaohua_image);
11.mImageView.setImageBitmap(toRoundCorner(bitmap, 30));