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

User · Accepted Answer

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;
        }
    });

User · Answer

I recently run into the same problem  I solved it by implementing my own ImageView class    Here is my Kotlin implementation   class MyImageView context  Context   ImageView context        private var currentDrawableId  Int    null      override fun setImageResource resId  Int            super setImageResource resId          currentDrawableId   resId            fun getDrawableId             return currentDrawableId            fun compareCurrentDrawable toDrawableId  Int    Boolean           if  toDrawableId    null    currentDrawableId    toDrawableId                return false                    return true

User · Answer

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

User · Answer

Digging StackOverflow for answers on the similar issue I found people usually suggesting 2 approaches     Load a drawable into memory and compare ConstantState or bitmap itself to other one  Set a tag with drawable id into a view and compare tags when you need that    Personally  I like the second approach for performance reason but tagging bunch of views with appropriate tags is painful and time consuming  This could be very frustrating in a big project  In my case I need to write a lot of Espresso tests which require comparing TextView drawables  ImageView resources  View background and foreground  A lot of work   So I eventually came up with a solution to delegate a  dirty  work to the custom inflater  In every inflated view I search for a specific attributes and and set a tag to the view with a resource id if any is found  This approach is pretty much the same guys from Calligraphy used  I wrote a simple library for that  TagView  If you use it  you can retrieve any of predefined tags  containing drawable resource id that was set in xml layout file   TagViewUtils getTag view  ViewTag IMAGEVIEW SRC id  TagViewUtils getTag view  ViewTag TEXTVIEW DRAWABLE LEFT id  TagViewUtils getTag view  ViewTag TEXTVIEW DRAWABLE TOP id  TagViewUtils getTag view  ViewTag TEXTVIEW DRAWABLE RIGHT id  TagViewUtils getTag view  ViewTag TEXTVIEW DRAWABLE BOTTOM id  TagViewUtils getTag view  ViewTag VIEW BACKGROUND id  TagViewUtils getTag view  ViewTag VIEW FOREGROUND id    The library supports any attribute  actually  You can add them manually  just look into the Custom attributes section on Github  If you set a drawable in runtime you can use convenient library methods   setImageViewResource ImageView view  int id    In this case tagging is done for you internally  If you use Kotlin you can write a handy extensions to call view itself  Something like this   fun ImageView setImageResourceWithTag  DrawableRes int id        TagViewUtils setImageViewResource this  id      You can find additional info in Tagging in runtime

User · Answer

As of today  there is no support on this function  However  I found a little hack on this one    imageView setImageResource R drawable ic star black 48dp    imageView setTag R drawable ic star black 48dp     So if you want to get the ID of the view  just get it s tag   if  imageView getTag      null       int resourceID    int  imageView getTag                 drawable id

User · Answer

A simple solution might be to just store the drawable id in a temporary variable   I m not sure how practical this would be for your situation but it s definitely a quick fix

User · Answer

Even easier  just store the R drawable id in the view s id  use v setId     Then get it back with v getId

[android] Get the ID of a drawable in ImageView

Examples related to android

Examples related to android-imageview

Examples related to android-drawable