Rotation Animation on menu item in Action Bar error

Question

I need help with an refresh button in my action bar. I already have this button but I want to let it rotate onclick. I've wrote this code here but I'm getting an error and the app is crashing:

The error:

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

Mx XML:

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:compat="http://schemas.android.com/tools"> <item android:id="@+id/menu_reloadbutton" android:icon="@drawable/ic_menu_reloadentry" android:title="@string/menu_reloadentry" app:showAsAction="ifRoom"/> </menu>

My code:

@Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_training, menu); // Declare ImageView and Animation for rotation animation MenuItem reloadButton = (MenuItem) menu.findItem(R.id.menu_reloadbutton); final Animation rotation = AnimationUtils.loadAnimation(getActivity(), R.anim.animation_rotate); if (reloadButton != null) { //reloadButton.setImageResource(R.drawable.ic_menu_reloadentry); reloadButton.getActionView().setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { rotation.setRepeatCount(Animation.INFINITE); view.startAnimation(rotation); } }); } }

Here is the canonical, but it's old: stackoverflow.com/questions/9731602/… Here is a more current answer as well: stackoverflow.com/a/19225651/4409409 — Daniel Nugent
– Daniel Nugent, Commented Jan 30, 2017 at 17:17
@DanielNugent Okay thanks! I've searched a lot but I never saw this answer... Please can you remove this duplicate? Because I'm blocked asking questions.. I will delete this question after this. — ItsOdi1
– ItsOdi1, Commented Jan 30, 2017 at 17:18
Possible duplicate of Animated menu item "jumps" when animation starts — Rod_Algonquin
– Rod_Algonquin, Commented Jan 30, 2017 at 17:20

McCoy AI · Accepted Answer · 2018-10-17 19:00:19Z

You need setActionView(R.layout.imageview_reload) before reloadButton.getActionView()

Just add layout file res/layout/imageview_reload

<?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" style="@android:style/Widget.ActionButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_menu_reloadentry" />

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