java - Comparing resources within two drawables

Question

I am trying to compare two drawables but without success. I did some research, there is even a similar question but did not help.

In my app, I use getCompoundDrawablesWithIntrinsicBounds to get the ImageView in the right position of a EditText. Then I need to check which image resource is alocated there.

This small sample should work, shouldn't it? It returns "not equal", though.

Drawable drawable1 = ContextCompat.getDrawable(getApplicationContext(),R.drawable.cor);

Drawable drawable2 = ContextCompat.getDrawable(getApplicationContext(),R.drawable.cor);


if(drawable1 == drawable2){
     System.out.println("equal");
}else{
     System.out.println("not equal");
 }

Answer 1

getConstantState doesn't work well

If you do this: if(drawable1 == drawable2){

you are comparing the reference of the objects and it not correct...

use instead equals with the getConstantState() method...

Update Try to compare with bytes or pixel is the only way that generally works.

 // Usage: 
 drawable1.bytesEqualTo(drawable2) 
 drawable1.pixelsEqualTo(drawable2) 
 bitmap1.bytesEqualTo(bitmap1) 
 bitmap1.pixelsEqualTo(bitmap2) 

https://gist.github.com/XinyueZ/3cca89416a1e443f914ed37f80ed59f2