Categories
android android-linearlayout background clickable

How to set Ripple effect on a LinearLayout programmatically?

I want to set the background android.R.attr.selectableItemBackground to a LinearLayout. When using XML there are no problems (it works)

<LinearLayout
android:id="@+id/llMiner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:attr/selectableItemBackground"
android:clickable="true" >

… but I have to do this in java code, so I’ve tried this

llMiner.setClickable(true);
llMiner.setBackgroundResource(android.R.attr.selectableItemBackground);

… and it doesn’t work, infact I get a NotFoundException on this second line.
So after I’ve tried this variant thinking that the resource is a Color.

llMiner.setClickable(true);
llMiner.setBackgroundColor(android.R.attr.selectableItemBackground);

This one doesn’t launch exception, but… doesn’t work (there are no changing of background when pressing, but the state change in pressed as it have to do)… any suggestion?

You can use this way.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// If we're running on Honeycomb or newer, then we can use the Theme's
// selectableItemBackground to ensure that the View has a pressed state
TypedValue outValue = new TypedValue();
this.getTheme().resolveAttribute(android.R.attr.selectableItemBackground, outValue, true);
textView.setBackgroundResource(outValue.resourceId);
}