android Bitmap generate monochrome bit bmp format image files

            
Need to implement the program recently painted graffiti image, you need to save it as a monochrome bit bmp image files. I hope the Supreme passing pointers twelve! ! ! ! !
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Read the value of each pixel, it becomes a greater than 80, the rain becomes 0.
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cited a floor reply:

read the value of each pixel, it becomes a greater than 80, the rain becomes 0.

You said pixel value is the value getPixels () to get the int []? My image is not very understanding, hope that the next elaborate.
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Do not sink! ! ! ! Urgent
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Does your generation monochrome bmp solved yet, I encountered the same problem you, hope you give help, thank you, QQ54110388
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Solved yet "?