android中图片倒影、圆角效果重绘
本文用来记录一些android 操作图片的方法，方便查看。
1.将Drawable转化为Bitmap
1 public static Bitmap drawableToBitmap(Drawable drawable){
2 int width = drawable.getIntrinsicWidth();
3 int height = drawable.getIntrinsicHeight();
4 Bitmap bitmap = Bitmap.createBitmap(width, height,
5 drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
6 : Bitmap.Config.RGB_565);
7 Canvas canvas = new Canvas(bitmap);
8 drawable.setBounds(0,0,width,height);
9 drawable.draw(canvas);
10 return bitmap;
11 }
2.获得圆角图片的方法
1 public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){
2
3 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
4 .getHeight(), Config.ARGB_8888);
5 Canvas canvas = new Canvas(output);
6
7 final int color = 0xff424242;
8 final Paint paint = new Paint();
9 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
10 final RectF rectF = new RectF(rect);
11
12 paint.setAntiAlias(true);
13 canvas.drawARGB(0, 0, 0, 0);
14 paint.setColor(color);
15 canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
16
17 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
18 canvas.drawBitmap(bitmap, rect, rect, paint);
19
20 return output;
21 }
3.获得带倒影的图片方法
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){
final int reflectionGap = 4;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap,
0, height/2, width, height/2, matrix, false);
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint deafalutPaint = new Paint();
canvas.drawRect(0, height,width,height + reflectionGap,
deafalutPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0,
bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
paint.setShader(shader); //important
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
