How do I add selectableItemBackground to an ImageButton programmatically?

Question

android.R.attr.selectableItemBackground exists, but how do I add it programatically to an ImageButton?

Also, how would I go about finding the answer in the documentation? It's mentioned here, but I don't see any explanation of how it's actually used. Actually, I rarely seem to find the documentation useful, but I'm hoping that's my fault and not that of the documentation.

Answer 1

Here is an example using answer here: How to get the attr reference in code?

    // Create an array of the attributes we want to resolve     // using values from a theme     // android.R.attr.selectableItemBackground requires API LEVEL 11     int[] attrs = new int[] { android.R.attr.selectableItemBackground /* index 0 */};      // Obtain the styled attributes. 'themedContext' is a context with a     // theme, typically the current Activity (i.e. 'this')     TypedArray ta = obtainStyledAttributes(attrs);      // Now get the value of the 'listItemBackground' attribute that was     // set in the theme used in 'themedContext'. The parameter is the index     // of the attribute in the 'attrs' array. The returned Drawable     // is what you are after     Drawable drawableFromTheme = ta.getDrawable(0 /* index */);      // Finally free resources used by TypedArray     ta.recycle();      // setBackground(Drawable) requires API LEVEL 16,      // otherwise you have to use deprecated setBackgroundDrawable(Drawable) method.      imageButton.setBackground(drawableFromTheme);     // imageButton.setBackgroundDrawable(drawableFromTheme);