how to change the color of certain pixels in bitmap android

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To set the colors of the pixels in your pixels array, get values from the static methods of Android’s Color class and assign them into your array. When you’re done, use setPixels to copy the pixels back to the bitmap.

For example, to turn the first five rows of the bitmap blue:

import android.graphics.Color;

int[] pixels = new int[myBitmap.getHeight()*myBitmap.getWidth()];
myBitmap.getPixels(pixels, 0, myBitmap.getWidth(), 0, 0, myBitmap.getWidth(), myBitmap.getHeight());
for (int i=0; i<myBitmap.getWidth()*5; i++)
    pixels[i] = Color.BLUE;
myBitmap.setPixels(pixels, 0, myBitmap.getWidth(), 0, 0, myBitmap.getWidth(), myBitmap.getHeight());

You can also set a pixel’s color in a Bitmap object one at a time without having to set up a pixel buffer with the setPixel() method:

myBitmap.setPixel(x, y, Color.rgb(45, 127, 0));

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