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
- public static Bitmap drawableToBitmap(Drawable drawable){
- int width = drawable.getIntrinsicWidth();
- int height = drawable.getIntrinsicHeight();
- Bitmap bitmap = Bitmap.createBitmap(width, height,
- drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
- : Bitmap.Config.RGB_565);
- Canvas canvas = new Canvas(bitmap);
- drawable.setBounds(0,0,width,height);
- drawable.draw(canvas);
- return bitmap;
- }
2.获得圆角图片的方法
- public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){
- 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);
- 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;
- }
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,
- , 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;
- }
