android 图片灰显

int resourceId=R.drawabel.icon;

Drawable d = getResources().getDrawable(resourceId);

Bitmap bp = drawableToBitmap(d);
bp = setGrey(bp);
imageView.setImageBitmap(bp);//灰显

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相关方法

/**
* 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;

}

 

/**
* 图片灰显
*
* @param bitmap
* @return
*/
public static final Bitmap setGrey(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();

Bitmap faceIconGreyBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(faceIconGreyBitmap);
Paint paint = new Paint();
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setSaturation(0);
ColorMatrixColorFilter colorMatrixFilter = new ColorMatrixColorFilter(colorMatrix);
paint.setColorFilter(colorMatrixFilter);
canvas.drawBitmap(bitmap, 0, 0, paint);
return faceIconGreyBitmap;
}