android - How to crop the image using four (x,y) coordinates

Question

In my application ,I am going to crop the image using four (x,y) coordinates and also I need to show the cropped image in another activity screen. For example, In the below image, i want to crop the white layer itself. so any one provide the solution to accomplish this technique in my project.

Answer 1

Using an instance of the Bitmap class, you can use the Bitmap.creatBitmap(); method passing the original image x y (for the top left corner) and then width and height.

see documentation here.

in your original example it would be:

Bitmap newBitmap=Bitmap.createBitmap(oldBitmap,10,20,70,80);

---

Edit

The Bitmap class also allows you to access an array of pixel int's representing color. if you know the shape you want to crop in terms of co-ordinates of each point. you could iterate through the array and set alpha to full on the ones that are outside your shape.