Java – ValueAnimator changes the background color

I want to create a screen where the background color constantly changes from red to blue. For some reason, it always crashes when I try to instantiate ValueAnimator. I don’t know what’s wrong with my code

Thanks

Animation classes

public BackgroundAnimation(Context context){
    super(context);
    ValueAnimator colorAnim = ObjectAnimator.ofInt(R.anim.animator, "backgroundColor", Color.RED, Color.BLUE);
    colorAnim.setDuration(3000);
    colorAnim.setEvaluator(new ArgbEvaluator());
    colorAnim.setRepeatCount(ValueAnimator.INFINITE);
    colorAnim.setRepeatMode(ValueAnimator.REVERSE);
   colorAnim.start();

}

animator.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">   
   <objectAnimator
         android:propertyName="backgroundColor"/>
</set>

Main class

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.menu);

LinearLayout container = (LinearLayout) findViewById(R.id.container);
    container.addView(new BackgroundAnimation(this));

}

ma​​in.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

<TextView
    android:id="@+id/TextView01"
    android:gravity="center"
    android:textSize="20sp"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>

<TextView
    android:id="@+id/TextView02"
    android:gravity="center"
    android:textSize="20sp"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>

<ImageView
    android:id="@+id/ImageView01"
    android:layout_width="fill_parent"
    android:layout_height="300sp"/>

</LinearLayout>

You can use ObjectAnimator to change the background color:

For API >= 21

:

ObjectAnimator colorAnimator = ObjectAnimator.ofArgb(travelersListView.getBackground().mutate(), "tint", mCurrentBackground, mFadeColor);
colorAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
colorAnimator.start();

For backward support for API 16, use:

ObjectAnimator colorAnimator = ObjectAnimator.ofObject(travelersListView.getBackground().mutate(), "tint", new ArgbEvaluator(), mCurrentBackground, mFadeColor);
colorAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
colorAnimator.start();