的Android - 裁剪从我需要裁剪位图multipoints

Question

的图像，但代替具有矩形裁剪的图像（我成功设法做到），我需要它是由坐标定义的任何形式。

我正在关注此线程的答案：Cutting a multipoint ploygon out of Bitmap and placing it on transparency，并试图实现它，但不幸它不会剪裁图像。

我在描述中做了，但似乎有某个地方的错误。图像以矩形方式绘制。 我错过了什么吗？

Bitmap originalBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.test_image); 
// Image cropped 
Bitmap croppedBitmap=Bitmap.createBitmap(originalBitmap, 10, 10, 200, 200); 
Canvas canvas=new Canvas(croppedBitmap); 

// Create a path 
Path path=new Path(); 
path.setFillType(FillType.INVERSE_EVEN_ODD); 
path.moveTo(0, 0); 
path.moveTo(0, 100); 
path.moveTo(100, 0); 
path.moveTo(0, 0); 

// Paint with Xfermode 
Paint paint=new Paint(); 
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); 

// Draw the path 
canvas.drawPath(path, paint); 

imageView.setImageBitmap(croppedBitmap); 

Answer 1

我非常接近解决方案。这里是：

compositeImageView = (ImageView) findViewById(R.id.imageView); 

Bitmap bitmap1=BitmapFactory.decodeResource(getResources(), R.drawable.batman_ad); 
Bitmap bitmap2=BitmapFactory.decodeResource(getResources(), R.drawable.logo); 

Bitmap resultingImage=Bitmap.createBitmap(320, 480, bitmap1.getConfig()); 

Canvas canvas = new Canvas(resultingImage); 

Paint paint = new Paint(); 
paint.setAntiAlias(true); 
Path path=new Path(); 
path.lineTo(150, 0); 
path.lineTo(230, 120); 
path.lineTo(70, 120); 
path.lineTo(150, 0); 

canvas.drawPath(path, paint); 

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
canvas.drawBitmap(bitmap2, 0, 0, paint); 

compositeImageView.setImageBitmap(resultingImage);