layoutinflater Show NullPonterExecption

Question

I can try may code by no result my app install in device but can`t run it show error in LayoutInflater

public class ViewPagerAdapter extends PagerAdapter {

    private LayoutInflater l;
    public  ViewPagerAdapter(){

    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        l =(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = l.inflate(layouts[position],container,false);
       container.addView(view);
        return view;
    }

    @Override
    public int getCount() {
        return layouts.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        View v= (View)object;
        container.removeView(v);
        }
    }
 }

Possible duplicate of [Android getSystemService inside custom ArrayAdapter](https://stackoverflow.com/questions/4321343/android-getsystemservice-inside-custom-arrayadapter) — fweigl, Dec 22 '17 at 22:42
Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Ratilal Chopda, Dec 23 '17 at 02:04
Please share the full exception and stack trace. Right now my guess is that `layouts` is null or it's something else unrelated to this code. — Eugen Pechanec, Dec 23 '17 at 10:26

score -1 · Answer 1 · answered Dec 22 '17 at 23:35

-1

Use LayoutInflater.from(container.getContext()) or container.getContext().getSystemService() to obtain your inflater instance

answered Dec 22 '17 at 23:35

elmorabea

3,243
1
14
20

`ViewPagerAdapter` looks like an inner class otherwise he wouldn't be able to call `getSystemService` directly. NPE comes probably from somewhere else. – Eugen Pechanec Dec 23 '17 at 10:26

Durga M · Answer 2 · 2017-12-23T10:32:45.490

-1

You can access the system services through context like below code

LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

You should pass the context to the ViewPagerAdapter through constructor, through which you can access the systemServices to get the inflater.

edited Dec 23 '17 at 10:32

answered Dec 23 '17 at 09:46

Durga M

534
5
17

`ViewPagerAdapter` looks like an inner class otherwise he wouldn't be able to call `getSystemService` directly. NPE comes probably from somewhere else. – Eugen Pechanec Dec 23 '17 at 10:23

Shreya Prajapati · Answer 3 · 2017-12-23T10:41:21.413

-2

Initialise your Inflater using,

  LayoutInflater inflater = getLayoutInflater().from(context);

edited Dec 23 '17 at 10:41

answered Dec 23 '17 at 10:13

Shreya Prajapati

114
12

Ctrl + click on `from` and you'll see the method does exactly what OP already does. – Eugen Pechanec Dec 23 '17 at 10:24
@ Eugen Pechanec, How are you taking value of context ?? – Shreya Prajapati Dec 23 '17 at 10:26
And where does your `context` come from? I'm assuming `ViewPagerAdapter` is an inner class in activity otherwise he wouldn't be able to call `getSystemService` and get a *compile time error* instead of a crash. – Eugen Pechanec Dec 23 '17 at 10:28
@EugenPechanec, context come from Activity where you have created object of ViewPagerAdapter, mAdapter=new ViewPagerAdapter(this, viewPager) – Shreya Prajapati Dec 23 '17 at 10:32

layoutinflater Show NullPonterExecption

3 Answers3