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");
 }

http://stackoverflow.com/questions/9125229/comparing-two-drawables-in-android — sasikumar, Apr 02 '16 at 12:56

score 13 · Accepted Answer · edited Jan 10 '18 at 17:34

13

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

edited Jan 10 '18 at 17:34

TeeTracker

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answered Apr 02 '16 at 12:57

ΦXocę 웃 Пepeúpa ツ

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1

I'll try that, even though I am not familiar with this method. What does it do exactly? – AndroidDev Apr 02 '16 at 13:46
2

Tested this and it still has false positive cases for SVGs. – cauende Nov 28 '19 at 10:40

Comparing resources within two drawables

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