Android 生成倒影图片

public staticBitmapcreateReflectedImage(Bitmap sourceBitmap) {

//背景虚化

LinearGradient gradient =newLinearGradient(0.0F,0.0F,0.0F,

sourceBitmap.getHeight(),0x70ffffff,0x00ffffff,Shader.TileMode.MIRROR);

//画笔

Paint paint =newPaint();

paint.setShader(gradient);

paint.setXfermode(newPorterDuffXfermode(PorterDuff.Mode.DST_IN));

//矩阵

Matrix matrix =newMatrix();

matrix.setScale(1.0F,-1.0F);

BitmapinverseBitmap= Bitmap.createBitmap(sourceBitmap,0,0,sourceBitmap.getWidth(),sourceBitmap.getHeight(),matrix,

true);

Bitmap destBitmap = Bitmap.createBitmap(sourceBitmap.getWidth(),sourceBitmap.getHeight(),Bitmap.Config.ARGB_8888);

Canvas canvas =newCanvas(destBitmap);

canvas.drawBitmap(inverseBitmap,0.0F,0.0F, null);

canvas.drawRect(0.0F,0.0F,sourceBitmap.getWidth(),sourceBitmap.getWidth(),paint);

if(!inverseBitmap.isRecycled())

inverseBitmap.recycle();

System.gc();

returndestBitmap;

}