CODEWITHSUNDEEP
android
dasdasd
dasdasd

Reputation: 2031

findViewById from viewpager

Hello im trying to use viewpager.

My problem is that I can't find views from my sliding views, I get NPE.

This is my code for finiding views:

@Override
public void onPageSelected(int arg0) {
    // TODO Auto-generated method stub

    focusedView = mPager.getChildAt(arg0);

    button = (ImageButton) focusedView.findViewById(R.id.button);
    button.setOnClickListener(this);
}

I get NPE on this line:

button.setOnClickListener(this);

All of my views sliding views have a button with "button" id.

I also tried this:

@Override
public void onPageSelected(int arg0) {
    // TODO Auto-generated method stub

    button = (ImageButton) mPager.findViewById(R.id.button);
    button.setOnClickListener(this);
}

I got here NPE too.

How can I find views from views inside pageviewer?

Upvotes: 0

Views: 175

Answers (2)

Szymon
Szymon

Reputation: 43023

You probably have this code in an activity or fragment.

Declare a final variable for your button on activity or fragment, get the reference to it in onCreate or onResume and then you will be able to use it in onPageSelected.

Sample (not complete) code:

public class YourActivity extends Activity {

    private final Button button;

    @Override
    protected void onResume() {

         button = (Button) findViewById(R.id.button);

    }


    // view pager
    @Override
    public void onPageSelected(int arg0) {

        focusedView = mPager.getChildAt(arg0);

        button.setOnClickListener(this);
    }

}

Upvotes: 0

hundeva
hundeva

Reputation: 1058

Handle the click events inside the fragments instead, you can do it in the method public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) for example.

Upvotes: 1

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