android 图片倾斜倒影

private Bitmap createInvertedImage(){



Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pic_1);



int width = bitmap.getWidth();

int height = bitmap.getHeight();



Matrix matrix = new Matrix();

// 设置图片旋转

matrix.preScale(1, -1);

//设置图片的缩放比，长度缩小一半

matrix.postScale(1, 0.5f);

//图片向右倾斜

matrix.preSkew(-0.5f, 0);

//倒影图片

Bitmap invertedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width,height,matrix,false);

//最后合成的图片

Bitmap finalInvertedBitmap = Bitmap.createBitmap(width+invertedBitmap.getWidth(), height+invertedBitmap.getHeight(), Config.ARGB_8888);

//构建画布，把倒影和原图先画在画布上

Paint paint = new Paint();

Canvas canvas = new Canvas(finalInvertedBitmap);

canvas.drawBitmap(bitmap, 0, 0, paint);

//设置倒影的透明度

paint.setAlpha(100);

canvas.drawBitmap(invertedBitmap, 0, height, paint);

//线性渐变

LinearGradient linearGradient = new LinearGradient(0, height, 0, finalInvertedBitmap.getHeight(), 0x70ffffff, 0x70ffffff, TileMode.MIRROR);

paint.setShader(linearGradient);

//不懂啥意思

paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

canvas.drawRect(0, height, width, finalInvertedBitmap.getHeight(), paint);

return finalInvertedBitmap;

}