Android uses ActionBar and ViewPager to switch pages

Android uses ActionBar and ViewPager to switch pages

The demo is as follows:

The project layout is as follows:

MainActivity. java code

Import java. util. arrayList; import java. util. list; import android. OS. bundle; import android. support. v4.app. fragment; import android. support. v4.app. fragmentManager; import android. support. v4.app. fragmentPagerAdapter; import android. support. v4.app. fragmentTransaction; import android. support. v4.view. viewPager; import android. support. v4.view. viewPager. onPageChangeListener; import android. support. v7.app. actionBar; import android. support. v7.app. actionBar. tab; import android. support. v7.app. actionBar. tabListener; import android. support. v7.app. actionBarActivity; import com. xuliugen. fragment. chatFragment; import com. xuliugen. fragment. friendFragment; import com. xuliugen. fragment. momentFragment; import com. xuliugen. fragment. moreFragment; public class MainActivity extends ActionBarActivity implements TabListener, OnPageChangeListener {private List
  
   
TabsList = new ArrayList
   
    
(4); private ViewPager viewPager; // ViewPager is used to store fragment private ActionBar actionBar; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // Add four fragment entries to the custom Tab to go to tabsList. add (new MyTab ("chat", ChatFragment. class); tabsList. add (new MyTab ("friend", FriendFragment. class); tabsList. add (new MyTab ("time", MomentFragment. class); tabsList. add (new MyTab ("more", MoreFragment. class); initActionBar ();} private void initActionBar () {// find viewpager viewPager = (ViewPager) this. findViewById (R. id. viewpager); actionBar = getSupportActionBar (); // obtain the ActionBar in v7. setNavigationMode (ActionBar. NAVIGATION_MODE_TABS); // set it to the navigation mode // Add the four tabs created to the actionBar through loop traversal for (MyTab Tab: tabsList) {tab t = actionBar. newTab (); // use the Tab t under v7. setText (tab. getText (); t. setTabListener (this); // sets the actionBar of the TabListener listener. addTab (t);} viewPager. setAdapter (new TabFragmentPagerAdapter (getSupportFragmentManager (); viewPager. setOnPageChangeListener (this);}/*** encapsulate the Class of a Tab ** the text of a tab ** the class contained in the tab */Class MyTab {private String text; // The title text private Class fragment; // The fragment public String getText () {return text;} public void setText (String text) {this. text = text;} public Class getFragment () {return fragment;} public void setFragment (Class fragment) {this. fragment = fragment;}/*** constructor for creating an object ** @ param string * @ param fragment */public MyTab (String string, Class fragment) {this. text = string; this. fragment = fragment; }}/ *** adapter set for viewpager */class TabFragmentPagerAdapter extends FragmentPagerAdapter {public TabFragmentPagerAdapter (FragmentManager fm) {super (fm );} @ Override public Fragment getItem (int I) {try {return (Fragment) tabsList. get (I ). getFragment (). newInstance ();} catch (InstantiationException e) {e. printStackTrace ();} catch (IllegalAccessException e) {e. printStackTrace () ;}return null ;}@ Override public int getCount () {return tabsList. size ();}} * is the method implemented by TabListener ******************* * ** // ** when the Tab is selected twice */@ Override public void onTabReselected (Tab tab, fragmentTransaction fragmentTransaction) {}/*** when the Tab is selected for a single time */@ Override public void onTabSelected (Tab tab, FragmentTransaction fragmentTransaction) {viewPager. setCurrentItem (tab. getPosition () ;}@ Override public void onTabUnselected (Tab tab, FragmentTransaction fragmentTransaction) {}/**************** below is the OnPageChangeListener implementation method *************** * // @ Override public void onPageScrollStateChanged (int I) {}@ Override public void onPageScrolled (int I, float arg1, int arg2) {}@ Override public void onPageSelected (int I) {actionBar. selectTab (actionBar. getTabAt (I ));}}
   
  

Below are four fragment

public class ChatFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_friends, container, false);    }}

public class FriendFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_chat, container, false);    }}

public class MomentFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_moment, container, false);    }}

public class MoreFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_more, container, false);    }}

Activity_main.xml

Below are four fragment layout files

The other three are the same, but the file name and content inside are changed.