This tutorial is really out of date, on android studio none of the fixes work, and the code is very different.

unfortunately, that code still doesn't work in that context. Try downloading the source yourself, it's broken.

im still having this null pointer exception in this line mViewPager.setAdapter(mSectionsPagerAdapter);}

please help, im using Android Studio

Hey Juan! Could you please show me your mViewPager and mSectionsPagerAdapter variable declarations?

Harry, I'm spending time before finishing this video trying to sort out the compat errors I'll run into for android studio, but the little snippet you've provided here has an mContext variable that I don't see declared in the boiler plate code. Is that where their null pointer exception is coming from, and if so, where in the scope are we declaring this context, where is it coming from?

Hi there Nicolas Hampton!

Sorry about that, the mContext variable is not needed - it is only used for setting the tabs titles if you are getting Strings from the strings.xml file (These strings must be accessed from the context).

I've reflected my answer above to show this.

Here are what the classes should look like depending on whether you're using the context or not:

Using context

public class SectionsPagerAdapter extends FragmentPagerAdapter {

protected Context mContext;

    public SectionsPagerAdapter(Context context, FragmentManager fm) {
        super(fm);
        mContext = context;
    }
// ... additional code

Class is then called like this:

mSectionsPagerAdapter = new SectionsPagerAdapter(this,
                getSupportFragmentManager());

Not using context

public class SectionsPagerAdapter extends FragmentPagerAdapter {

protected Context mContext;

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }
// ... additional code

Class is then called like this:

mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

Hopefully this should clarify some things up but, if you're still having issues with your SectionsPagerAdapter then please do post your code here so that we can take a look :)