Get the ID of a drawable in ImageView

Question

I have one ImageView and set a drawable on it. Now I need to get the ID of the drawable on click event of ImageView dynamically. How can I get it?

imgtopcolor = (ImageView) findViewById(R.id.topcolor);  imgtopcolor.setImageResource(R.drawable.dr);  // How do I get this back? 

Now on touch event of imgtopcolor i want to need drawable id because I am setting different drawable each time and want to compare the drawable with other

Answer 1

I think if I understand correctly this is what you are doing.

ImageView view = (ImageView) findViewById(R.id.someImage); view.setOnClickListener(new OnClickListener() {     @Override     public void onClick(View view) {         ImageView imageView = (ImageView) view;         assert(R.id.someImage == imageView.getId());          switch(getDrawableId(imageView)) {             case R.drawable.foo:                 imageView.setDrawableResource(R.drawable.bar);                 break;             case R.drawable.bar:             default:                 imageView.setDrawableResource(R.drawable.foo);             break;         }     }); 

Right? So that function getDrawableId() doesn't exist. You can't get a the id that a drawable was instantiated from because the id is just a reference to the location of data on the device on how to construct a drawable. Once the drawable is constructed it doesn't have a way to get back the resourceId that was used to create it. But you could make it work something like this using tags

ImageView view = (ImageView) findViewById(R.id.someImage); view.setOnClickListener(new OnClickListener() {     @Override     public void onClick(View view) {         ImageView imageView = (ImageView) view;         assert(R.id.someImage == imageView.getId());          // See here         Integer integer = (Integer) imageView.getTag();         integer = integer == null ? 0 : integer;          switch(integer) {         case R.drawable.foo:             imageView.setDrawableResource(R.drawable.bar);             imageView.setTag(R.drawable.bar);             break;         case R.drawable.bar:         default:             imageView.setDrawableResource(R.drawable.foo);             imageView.setTag(R.drawable.foo);             break;         }     }); 

Answer 2

I answered something like this in another question already, but will change it just a little for this one.

Unfortunately, there is no getImageResource() or getDrawableId(). But, I created a simple workaround by using the ImageView tags.

In onCreate():

imageView0 = (ImageView) findViewById(R.id.imageView0); imageView1 = (ImageView) findViewById(R.id.imageView1); imageView2 = (ImageView) findViewById(R.id.imageView2);  imageView0.setTag(R.drawable.apple); imageView1.setTag(R.drawable.banana); imageView2.setTag(R.drawable.cereal); 

Then, if you like, you can create a simple function to get the drawable id:

private int getDrawableId(ImageView iv) {     return (Integer) iv.getTag(); } 

Too easy.