使用Fragment+ViewPager实现底部导航栏

public class MainActivity extends FragmentActivity { 
 private TextView title_text; 
 private ViewPager vp_main_tab; 
 private List fragmentList = null; 
 private FragmentPagerAdapter mAdapter = null; 
 
 private MyFragment myFragment; 
 private TimeGroupFragment timeGroupFragment; 
 private PlanningFragment planningFragment; 
 
 private RadioButton rb_main_tab_menu1; 
 private RadioButton rb_main_tab_menu2; 
 private RadioButton rb_main_tab_menu3; 
 private RadioGroup rg_main_group; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  requestWindowFeature(Window.FEATURE_NO_TITLE); 
  setContentView(R.layout.activity_main); 
  init(); 
  rg_main_group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { 
 
   @Override 
   public void onCheckedChanged(RadioGroup group, int checkedId) { 
    switch (checkedId) { 
     case R.id.rb_main_tab_menu1: 
      vp_main_tab.setCurrentItem(0); 
      initActionbar(0); 
      break; 
     case R.id.rb_main_tab_menu2: 
      vp_main_tab.setCurrentItem(1); 
      initActionbar(1); 
      break; 
     case R.id.rb_main_tab_menu3: 
      vp_main_tab.setCurrentItem(2); 
      initActionbar(2); 
      break; 
     default: 
      break; 
    } 
 
   } 
  }); 
  initViewPage(); 
 } 
 private void initActionbar(int currentPage) { 
  switch (currentPage) { 
   case 0: 
    title_text.setText(getResources().getString(R.string.TimeRobot)); 
    break; 
   case 1: 
    title_text.setText(getResources().getString(R.string.timeGroup)); 
    break; 
   case 2: 
    title_text.setText(getResources().getString(R.string.My)); 
    break; 
   default: 
    break; 
  } 
 } 
 private void init() { 
  title_text = (TextView) findViewById(R.id.tv_title_actionbar); 
  vp_main_tab = (ViewPager) findViewById(R.id.vp_activity_main); 
  fragmentList = new ArrayList(); 
  rg_main_group = (RadioGroup) findViewById(R.id.rg_main_radioGroup); 
  rb_main_tab_menu1 = (RadioButton) findViewById(R.id.rb_main_tab_menu1); 
  rb_main_tab_menu2 = (RadioButton) findViewById(R.id.rb_main_tab_menu2); 
  rb_main_tab_menu3 = (RadioButton) findViewById(R.id.rb_main_tab_menu3); 
 
  myFragment = new MyFragment(); 
  timeGroupFragment = new TimeGroupFragment(); 
  planningFragment = new PlanningFragment(); 
 
  fragmentList.add(myFragment); 
  fragmentList.add(timeGroupFragment); 
  fragmentList.add(planningFragment); 
 
 
 } 
 
 private void initViewPage() { 
  android.support.v4.app.FragmentManager fm = getSupportFragmentManager(); 
  mAdapter = new FragmentPagerAdapter(fm) { 
 
   @Override 
   public int getCount() { 
    return fragmentList == null ? 0 : fragmentList.size(); 
   } 
 
   @Override 
   public android.support.v4.app.Fragment getItem(int position) { 
    return fragmentList.get(position); 
   } 
  }; 
  vp_main_tab.setAdapter(mAdapter); 
  vp_main_tab.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 
 
   @Override 
   public void onPageSelected(int position) { 
    initActionbar(position); 
    switch (position) { 
     case 0: 
      rb_main_tab_menu1.setChecked(true); 
      break; 
     case 1: 
      rb_main_tab_menu2.setChecked(true); 
      break; 
     case 2: 
      rb_main_tab_menu3.setChecked(true); 
      break; 
     default: 
      break; 
    } 
   } 
 
   @Override 
   public void onPageScrolled(int arg0, float arg1, int arg2) { 
   } 
 
   @Override 
   public void onPageScrollStateChanged(int state) { 
   } 
  }); 
 } 
}