?android:attr/selectableItemBackground with another existing background

Question

I have a 9patch set as the background of my layout. However I still want to provide touch feedback by using the `selectableItemBackground` attr. I've tried using a `` with the 9patch and `selectableItemBackground` as the `android:drawable` of the second ``, however that did not work. I could also try making a selector and overlay the gradient drawable android uses for `selectableItemBackground` in `list_selector_background_pressed.xml` with a ``. But in 4.4 KitKat the selected background color is actually gray instead of blue in JellyBeans, so I can't really hardcode it :( There has to be an easier way, right guys? D:

Accepted Answer

I've tried using a with the 9patch and selectableItemBackground as the android:drawable of the second , however that did not work.

Yes, drawable attribute in a layer-list (or state-list) does not accept an `attr` value. You would see a `Resource.NotFoundException`. A look at LayerDrawable's (or StateListDrawable's) source code explains why: the value that you provide is assumed to be a drawable's id.

But, you can retrieve a theme and platform-specific drawable for an attribute in code:

```
// Attribute array
int[] attrs = new int[] { android.R.attr.selectableItemBackground };

TypedArray a = getTheme().obtainStyledAttributes(attrs);

// Drawable held by attribute 'selectableItemBackground' is at index '0'        
Drawable d = a.getDrawable(0);

a.recycle();
```

Now, you can create a `LayerDrawable`:

```
LayerDrawable ld = new LayerDrawable(new Drawable[] {

// Nine Path Drawable
                       getResources().getDrawable(R.drawable.Your_Nine_Path),

// Drawable from attribute  
                       d });

// Set the background to 'ld'
yourLayoutContainer.setBackground(ld);
```

You'll also need to set `yourLayoutContainer's clickable` attribute:

```
android:clickable="true"
```

?android:attr/selectableItemBackground with another existing background

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