android - compare two images is same or not

Question

I know how to compare two string is same or not.this is coding for compare two strings TextView t,t1;

String s,s1;
s=t.getText().toString();
s1=t1.setText().toString();
if(s.equals(s1)){
   t.setText("equal");
}
else{
   t.setText("not equal");
}

i need the coding for compare two images are same or not.please give me early

Answer 1

Check that the height matches, if not return false. Then, check if the width matches, and if not, return false. Then check each pixel until you find one that doesn't match. When you do, return false. If every pixel matches, return true.

Pseudocode

bool imagesAreEqual(Image i1, Image i2)
{
    if (i1.getHeight() != i2.getHeight) return false;
    if (i1.getWidth() != i2.getWidth) return false;

    for (int y = 0; y < i1.getHeight(); ++y)
       for (int x = 0; x < i1.getWidth(); ++x)
            if (i1.getPixel(x, y) != i2.getPixel(x, y)) return false;

    return true;
}

In reality, you probably want to treat the image as a two dimensional array if you can, and just compare bytes. I don't know the Android image API, but getPixel might be slow.