圆角图片的处理和圆角按钮的动画

/**
         * 把图片变成圆角
         * @param bitmap 需要修改的图片
         * @param pixels 圆角的弧度
         * @return 圆角图片
         */
        public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
   
            Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
            Canvas canvas = new Canvas(output);
   
            final int color = 0xff424242;
            final Paint paint = new Paint();
            final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
            final RectF rectF = new RectF(rect);
            final float roundPx = pixels;
   
            paint.setAntiAlias(true);
            canvas.drawARGB(0, 0, 0, 0);
            paint.setColor(color);
            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
   
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
            canvas.drawBitmap(bitmap, rect, rect, paint);
   
            return output;
        }
===================================================================
/**
  * 将图片设置为圆角
  */
public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
  Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
  bitmap.getHeight(), Config.ARGB_8888);
  Canvas canvas = new Canvas(output);
  final int color = 0xff424242;
  final Paint paint = new Paint();
  final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
  final RectF rectF = new RectF(rect);
  final float roundPx = pixels;
  paint.setAntiAlias(true);
  canvas.drawARGB(0, 0, 0, 0);
  paint.setColor(color);
  canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
  paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
  canvas.drawBitmap(bitmap, rect, rect, paint);
  return output;
}
复制代码
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="http://schemas.android.com/apk/res/android"

4. android:id="@+id/layout" android:orientation="vertical"

5. android:layout_width="wrap_content"

6. android:layout_height="wrap_content">

7.</LinearLayout>
.mInflater = LayoutInflater.from(this);



Drawable drawable = getResources().getDrawable(R.drawable.icon);

BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;

Bitmap bitmap = bitmapDrawable.getBitmap();


View view = mInflater.inflate(

R.layout.share_xiaohua_revert_lv_item_top, null);

ImageView mImageView = (ImageView) view

.findViewById(R.id.lv_xiaohua_image);

mImageView.setImageBitmap(toRoundCorner(bitmap, 30));