Why can't Android Studio resolve symbol ViewPager?

Question

I'm new to Android and I'm following the Big Nerd Ranch Guide. In the book we are creating a ViewPager to be able to swipe between list-details. For some reason Android Studio doesn't recognise the ViewPager. Look below for the code.

import android.app.Activity;
import android.os.Bundle;
import android.view.ViewPager;

public class CrimePagerActivity extends Activity {
    private ViewPager mViewPager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
}

I don't know what to do or what could be wrong? Has this something to do with the Android SDK?

Answer 1

Make sure you have downloaded the Android Support Repository using the SDK Manager.

Open the build.gradle file and Add the support library to the dependencies section:

compile 'com.android.support:support-v4:23.0.1'

change your import to this:

import android.support.v4.view.ViewPager;