super.OnCreate NPE error

[gau4sar]

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.heinrichreimersoftware.materialintro.view.FadeableViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
                                                                                 at com.heinrichreimersoftware.materialintro.app.IntroActivity.findViews(IntroActivity.java:282)
                                                                                 at com.heinrichreimersoftware.materialintro.app.IntroActivity.onCreate(IntroActivity.java:174)
                                                                                 at Method) 

This is my activity

public class AppIntroActivity extends IntroActivity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setFullscreen(true);

        addSlide(new SimpleSlide.Builder()
            .title(R.string.welcome_text)
            .description(R.string.description)
            .image(R.drawable.finalroadlogo)
            .background(R.color.LAPIS_LAZULI)
            .backgroundDark(R.color.btn_pressed_dark_blue)
            .build());

        addSlide(new SimpleSlide.Builder()
            .title(R.string.welcome_text)
            .description(R.string.description)
            .image(R.drawable.finalroadlogo)
            .background(R.color.LAPIS_LAZULI)
            .backgroundDark(R.color.btn_pressed_dark_blue)
            .build());
    }
}

[heinrichreimer]

Did you call setContentView() or did you overrride R.layout.activity_intro?

[gau4sar]

The code is as it is . I have not called setContentView() neither have i overriden R.layout.activity_intro

[gau4sar]

@heinrichreimer did you get around to solving this issue ?

[heinrichreimer]

The error message says that the activity can't find the ViewPager in the content view. There are two reasons for this:

1. Someone called setContentView() with another layout resource
2. Someone has overriden the library's layout resource R.layout.activity_intro

To help me understand the issue better please use the hierachy viewer from the android development kit and post a screenshot of the layout hierachy.

[heinrichreimer]

FYI I can't reproduce this issue on either my phone or the emulator. Are you using any framework or stuff that hacks in your Android resources?

[heinrichreimer]

Closing due to inactivity. Will reopen this if you provide more information on how to reproduce this issue.

[suomi35]

Heinrich, I had the same issue. The cause ended up being that I had another layout named R.layout.activity_intro, as you suggested about. Once I got rid of that file everything worked fine.
Perhaps you could add a more unique naming convention to the library resources, like R.layout.hrs.activity_intro or something...or just add a note in the README ;)
Thanks for a great library!