Converting array of int to Bitmap on Android

Why not use Bitmap.setPixel? It's even API level 1:

int[] array  = your array of pixels here...
int   width  = width of "array"...
int   height = height of "array"...

// Create bitmap
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

// Set the pixels
bitmap.setPixels(array, 0, width, 0, 0, width, height);

You can play with offset/stride/x/y as needed.
No loops. No additional allocations.

Yeah, sounds like you have all the info you need. If M is the width and N is the height, you can create a new bitmap with Bitmap.createBitmap, and you can fill in the ARGB values with the setPixels method which takes an int array.

Bitmap.createBitmap

Bitmap.setPixels

Try this, it will give you the bitmap:

 // You are using RGBA that's why Config is ARGB.8888 
    bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
 // vector is your int[] of ARGB 
    bitmap.copyPixelsFromBuffer(IntBuffer.wrap(vector));

Or you can generate IntBuffer from the following native method:

private IntBuffer makeBuffer(int[] src, int n) {
    IntBuffer dst = IntBuffer.allocate(n*n);
    for (int i = 0; i < n; i++) {
        dst.put(src[i]);
    }
    dst.rewind();
    return dst;
}