app/src/main/java/com/camilstaps/taize/CollectionDemoActivity.java


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package com.camilstaps.taize;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;

/**
 * Created by camilstaps on 8-4-15.
 */
public class CollectionDemoActivity extends FragmentActivity {
    private static final int NUM_PAGES = 3;

    // When requested, this adapter returns a DemoObjectFragment,
    // representing an object in the collection.
    DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
    ViewPager mViewPager;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.pager);

        // ViewPager and its adapters use support library
        // fragments, so use getSupportFragmentManager.
        mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getSupportFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mDemoCollectionPagerAdapter);
    }

    @Override
    public void onBackPressed() {
        if (mViewPager.getCurrentItem() == 0) {
            super.onBackPressed();
        } else {
            mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1);
        }
    }

    private class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
        public DemoCollectionPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            return new DemoObjectFragment();
        }

        @Override
        public int getCount() {
            return NUM_PAGES;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return "OBJECT " + (position + 1);
        }
    }
}