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.

possible duplicate: http://stackoverflow.com/questions/9398610/how-to-get-the-attr-reference-in-code — Timuçin, Dec 11 '13 at 23:17
Please note mine is a two part question, the second not being adressed in the other thread. — abc32112, Dec 12 '13 at 08:53

score 54 · Answer 1 · edited May 23 '17 at 11:55

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);

This did not work, at least on Lollipop with AppCompat. However, [this did.](http://stackoverflow.com/a/28087443/1489860) — Jeffrey Mixon, Feb 14 '15 at 04:16
Code works fine for me on Lollipop with AppCompat (May 2017) - only difference was I used `View.setForeground(Drawable)` instead of `setBackground()` — Richard Le Mesurier, May 26 '17 at 15:47

score 51 · Answer 2 · edited Sep 03 '15 at 17:22

51

If you are using AppCompat you could use following code:

int[] attrs = new int[]{R.attr.selectableItemBackground};
TypedArray typedArray = context.obtainStyledAttributes(attrs);
int backgroundResource = typedArray.getResourceId(0, 0);
view.setBackgroundResource(backgroundResource);
typedArray.recycle();

edited Sep 03 '15 at 17:22

James McCracken

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answered Jul 08 '15 at 12:12

Andrey T

1,958
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@Renges you should set flags `setClickable(true)` and `setFocusable(true)` – M. Reza Nasirloo Jan 12 '16 at 17:46
1

setFocusable(true) is unnecessary here and actually excessive as long as item could get into the sate of 'focused item' and got gray background. The ripple effect will work even without this attribute set – Alexey Strakh Apr 19 '16 at 21:25
1

Focusable is for accessibility, it should be on clickable items – Laurent Russier Dec 27 '17 at 09:52
1

what about foreground? there is no method like setForegroundResource – user924 Mar 10 '18 at 13:09

score 9 · Answer 3 · answered Nov 28 '16 at 08:27

This works for me with my TextView:

// Get selectable background
TypedValue typedValue = new TypedValue();
getTheme().resolveAttribute(R.attr.selectableItemBackground, typedValue, true);

clickableTextView.setClickable(true);
clickableTextView.setBackgroundResource(typedValue.resourceId);

Because I use AppCompat library, I use R.attr.selectableItemBackground not android.R.attr.selectableItemBackground.

I think typedValue.resourceId holds all drawables from selectableItemBackground than using TypeArray#getResourceId(index, defValue) or TypeArray#getDrawable(index) which are retrieve only a drawable at the given index.

score 4 · Answer 4 · answered Feb 14 '18 at 18:33

4

Try this method:

public Drawable getDrawableFromAttrRes(int attrRes, Context context) {
    TypedArray a = context.obtainStyledAttributes(new int[] {attrRes});
    try {
        return a.getDrawable(0);
    } finally {
        a.recycle();
    }
}

// Then just call it like this:

getDrawableFromAttrRes(R.attr.selectableItemBackground, context)

// Example
ViewCompat.setBackground(view,getDrawableFromAttrRes(R.attr.selectableItemBackground, context))

answered Feb 14 '18 at 18:33

Sergio Serra

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Sometimes Android Studio will warn about using `R.attr.selectableItemBackground`, so it may be safer to replace it with `android.R.attr.selectableItemBackground` – Mr-IDE Apr 22 '19 at 18:11

How do I add selectableItemBackground to an ImageButton programmatically?

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