How to programmatically set backgroundTint of FloatingActionButton with ColorStateList?

Question

Programmatically setting my FloatingActionButton's backgroundTint via setBackgroundTintList method does not work, but setting it via XML app:backgroundTint tag does work - why is that?

The fab_background_color.xml color list state is:

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_selected="true"
          android:color="#654321"/>

    <item android:color="#123456"/>

</selector>

My activity layout is:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>

</android.support.design.widget.CoordinatorLayout>

and activity code:

public class SampleActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_position_sample);

        final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.test);

        // Uncomment to test - this does NOT work however.
        //fab.setBackgroundTintList(getResources().getColorStateList(R.color.fab_background_color));

        fab.setOnClickListener(new View.OnClickListener()
        {
            @Override public void onClick(View v)
            {
                if (fab.isSelected())
                    fab.setSelected(false);
                else
                    fab.setSelected(true);
            }
        });
    }
}

If I add:

fab.setBackgroundTintList(getResources().getColorStateList(R.color.fab_background_color));

or:

fab.setBackgroundTintList(ContextCompat.getColorStateList(this, R.color.fab_background_color));

To the activity code before setting up the click listener, nothing happens.

If I add:

app:backgroundTint="@color/fab_background_color"

To the activity layout code for the FloatingActionButton, I get the expected behavior.

Any thoughts? Am I doing something wrong?

Answer 1

use this:

fab.setBackgroundTintList(ContextCompat.getColorStateList(getApplicationContext(), R.color.purple_200));

Cheers!

Answer 2

Since setBackgroundTintList is only supported in API 21+ you can use ViewCompat.

ViewCompat.setBackgroundTintList(
    fab, 
    ContextCompat.getColorStateList(
        getApplicationContext(),
        R.color.purple_200
    )
);