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HorizontalPaging / src / com.example.android.horizontalpaging /

MainActivity.java

       
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        package com.example.android.horizontalpaging;
       
       
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        import android.app.ActionBar;
       
       
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        import android.app.FragmentTransaction;
       
       
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        import android.os.Bundle;
       
       
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        import android.support.v4.app.Fragment;
       
       
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        import android.support.v4.app.FragmentActivity;
       
       
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        import android.support.v4.app.FragmentManager;
       
       
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        import android.support.v4.app.FragmentPagerAdapter;
       
       
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        import android.support.v4.view.ViewPager;
       
       
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        import android.view.LayoutInflater;
       
       
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        import android.view.View;
       
       
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        import android.view.ViewGroup;
       
       
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        import android.widget.TextView;
       
       
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        import java.util.Locale;
       
       
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        public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
       
       
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        /**
       
       
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        * The {@link android.support.v4.view.PagerAdapter} that will provide
       
       
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        * fragments for each of the sections. We use a
       
       
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        * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
       
       
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        * will keep every loaded fragment in memory. If this becomes too memory
       
       
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        * intensive, it may be best to switch to a
       
       
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        * {@link android.support.v4.app.FragmentStatePagerAdapter}.
       
       
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        */
       
       
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        SectionsPagerAdapter mSectionsPagerAdapter;
       
       
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        /**
       
       
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        * The {@link ViewPager} that will host the section contents.
       
       
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        */
       
       
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        ViewPager mViewPager;
       
       
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        /**
       
       
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        * Create the activity. Sets up an {@link android.app.ActionBar} with tabs, and then configures the
       
       
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        * {@link ViewPager} contained inside R.layout.activity_main.
       
       
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        *
       
       
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        * <p>A {@link SectionsPagerAdapter} will be instantiated to hold the different pages of
       
       
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        * fragments that are to be displayed. A
       
       
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        * {@link android.support.v4.view.ViewPager.SimpleOnPageChangeListener} will also be configured
       
       
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        * to receive callbacks when the user swipes between pages in the ViewPager.
       
       
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        *
       
       
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        * @param savedInstanceState
       
       
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        */
       
       
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        @Override
       
       
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        protected void onCreate(Bundle savedInstanceState) {
       
       
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        super.onCreate(savedInstanceState);
       
       
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        // Load the UI from res/layout/activity_main.xml
       
       
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        setContentView(R.layout.sample_main);
       
       
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        // Set up the action bar. The navigation mode is set to NAVIGATION_MODE_TABS, which will
       
       
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        // cause the ActionBar to render a set of tabs. Note that these tabs are *not* rendered
       
       
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        // by the ViewPager; additional logic is lower in this file to synchronize the ViewPager
       
       
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        // state with the tab state. (See mViewPager.setOnPageChangeListener() and onTabSelected().)
       
       
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        final ActionBar actionBar = getActionBar();
       
       
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        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
       
       
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        // Create the adapter that will return a fragment for each of the three primary sections
       
       
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        // of the app.
       
       
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        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
       
       
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        // Set up the ViewPager with the sections adapter.
       
       
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        mViewPager = (ViewPager) findViewById(R.id.pager);
       
       
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        mViewPager.setAdapter(mSectionsPagerAdapter);
       
       
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        // When swiping between different sections, select the corresponding tab. We can also use
       
       
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        // ActionBar.Tab#select() to do this if we have a reference to the Tab.
       
       
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        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
       
       
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        @Override
       
       
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        public void onPageSelected(int position) {
       
       
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        actionBar.setSelectedNavigationItem(position);
       
       
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        }
       
       
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        });
       
       
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        // For each of the sections in the app, add a tab to the action bar.
       
       
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        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
       
       
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        // Create a tab with text corresponding to the page title defined by the adapter. Also
       
       
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        // specify this Activity object, which implements the TabListener interface, as the
       
       
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        // callback (listener) for when this tab is selected.
       
       
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        actionBar.addTab(
       
       
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        actionBar.newTab()
       
       
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        .setText(mSectionsPagerAdapter.getPageTitle(i))
       
       
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        .setTabListener(this));
       
       
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        }
       
       
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        }
       
       
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        /**
       
       
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        * Update {@link ViewPager} after a tab has been selected in the ActionBar.
       
       
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        *
       
       
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        * @param tab Tab that was selected.
       
       
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        * @param fragmentTransaction A {@link android.app.FragmentTransaction} for queuing fragment operations to
       
       
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        *                            execute once this method returns. This FragmentTransaction does
       
       
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        *                            not support being added to the back stack.
       
       
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        */
       
       
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        @Override
       
       
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        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
       
       
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        // When the given tab is selected, tell the ViewPager to switch to the corresponding page.
       
       
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        mViewPager.setCurrentItem(tab.getPosition());
       
       
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        }
       
       
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        /**
       
       
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        * Unused. Required for {@link android.app.ActionBar.TabListener}.
       
       
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        */
       
       
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        @Override
       
       
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        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
       
       
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        }
       
       
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        /**
       
       
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        * Unused. Required for {@link android.app.ActionBar.TabListener}.
       
       
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        */
       
       
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        @Override
       
       
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        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
       
       
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        }
       
       
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        /**
       
       
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        * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
       
       
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        * one of the sections/tabs/pages. This provides the data for the {@link ViewPager}.
       
       
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        */
       
       
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        public class SectionsPagerAdapter extends FragmentPagerAdapter {
       
       
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        public SectionsPagerAdapter(FragmentManager fm) {
       
       
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        super(fm);
       
       
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        }
       
       
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        /**
       
       
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        * Get fragment corresponding to a specific position. This will be used to populate the
       
       
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        * contents of the {@link ViewPager}.
       
       
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        *
       
       
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        * @param position Position to fetch fragment for.
       
       
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        * @return Fragment for specified position.
       
       
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        */
       
       
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        @Override
       
       
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        public Fragment getItem(int position) {
       
       
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        // getItem is called to instantiate the fragment for the given page.
       
       
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        // Return a DummySectionFragment (defined as a static inner class
       
       
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        // below) with the page number as its lone argument.
       
       
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        Fragment fragment = new DummySectionFragment();
       
       
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        Bundle args = new Bundle();
       
       
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        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
       
       
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        fragment.setArguments(args);
       
       
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        return fragment;
       
       
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        }
       
       
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        /**
       
       
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        * Get number of pages the {@link ViewPager} should render.
       
       
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        *
       
       
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        * @return Number of fragments to be rendered as pages.
       
       
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        */
       
       
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        @Override
       
       
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        public int getCount() {
       
       
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        // Show 3 total pages.
       
       
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        return 3;
       
       
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        }
       
       
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        /**
       
       
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        * Get title for each of the pages. This will be displayed on each of the tabs.
       
       
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        *
       
       
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        * @param position Page to fetch title for.
       
       
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        * @return Title for specified page.
       
       
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        */
       
       
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        @Override
       
       
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        public CharSequence getPageTitle(int position) {
       
       
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        Locale l = Locale.getDefault();
       
       
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        switch (position) {
       
       
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        case 0:
       
       
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        return getString(R.string.title_section1).toUpperCase(l);
       
       
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        case 1:
       
       
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        return getString(R.string.title_section2).toUpperCase(l);
       
       
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        case 2:
       
       
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        return getString(R.string.title_section3).toUpperCase(l);
       
       
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        }
       
       
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        return null;
       
       
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        }
       
       
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        }
       
       
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        /**
       
       
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        * A dummy fragment representing a section of the app, but that simply displays dummy text.
       
       
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        * This would be replaced with your application's content.
       
       
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        */
       
       
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        public static class DummySectionFragment extends Fragment {
       
       
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        /**
       
       
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        * The fragment argument representing the section number for this
       
       
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        * fragment.
       
       
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        */
       
       
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        public static final String ARG_SECTION_NUMBER = "section_number";
       
       
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        public DummySectionFragment() {
       
       
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        }
       
       
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        @Override
       
       
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        public View onCreateView(LayoutInflater inflater, ViewGroup container,
       
       
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        Bundle savedInstanceState) {
       
       
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        View rootView = inflater.inflate(R.layout.fragment_main_dummy, container, false);
       
       
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        TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
       
       
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        dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
       
       
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        return rootView;
       
       
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        }
       
       
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        }
       
       
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        }