Initialize Drawable image in Android Fragment

Question

I have two pictures I would like to rotate as a background image on an android app in a fragment.

Right now one is statically in the .xml as

android:background="@drawable/background"

I am trying to initialize the two photos in my Fragment.java but I am getting null pointer errors.

private Drawable img1 =
ContextCompat.getDrawable(this.getContext(),R.drawable.background);

private Drawable img2 =
ContextCompat.getDrawable(this.getContext(),R.drawable.background2);

Does anyone have any suggestions why I am getting a null error here?

Thanks!

Which line causes the `NullPointerException`? I suggest adding some logging just before that line to determine which variable is null. — Code-Apprentice, Jan 25 '16 at 20:53
Related question: http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it and — Code-Apprentice, Jan 25 '16 at 20:56
You should also checkout your logcat. (If you don't know how, a quick google search will show you.) — Code-Apprentice, Jan 25 '16 at 20:56
Are you sure the the file background.png (or jpg) is in the drawable/ folder? — Kristy Welsh, Jan 25 '16 at 21:03

score 0 · Answer 1 · answered Jan 25 '16 at 20:51

0

You probably want getActivity() rather than getContext(). getContext was added in API 23, and I think results in a NPE if called in prior versions.

answered Jan 25 '16 at 20:51

cwbowron

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If that doesn't help, delay loading the Drawables until onCreate or another one of the life-cycle callbacks. – cwbowron Jan 25 '16 at 20:53
Loading the Drawables too soon is very likely the culprit here. – Code-Apprentice Jan 25 '16 at 20:57

score 0 · Answer 2 · edited Oct 09 '19 at 15:42

0

Call it in the onCreateView instead of assigning the value directly. it will resolve your issue.

private Drawable deleteIcon;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
deleteIcon= ContextCompat.getDrawable(getContext(),R.drawable.ic_delete_black_24dp);}

edited Oct 09 '19 at 15:42

Dharman

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answered Oct 09 '19 at 15:32

Asghar Nazir

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Initialize Drawable image in Android Fragment

2 Answers2