activity_main.xml

HomeFragment

public class HomeFragment extends Fragment {    private View mRootView;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        if (mRootView == null){            mRootView = inflater.inflate(R.layout.home_fragment,container,false);        }        ViewGroup parent = (ViewGroup) mRootView.getParent();        if (parent != null){            parent.removeView(mRootView);        }        return mRootView;    }}

MainActivity

public class MainActivity extends AppCompatActivity {    private FragmentTabHost mTabHost;    private ViewPager mViewPager;    private List
     
       mFragmentList;    private Class mClass[] = {HomeFragment.class,ReportFragment.class,MessageFragment.class,MineFragment.class};    private Fragment mFragment[] = {new HomeFragment(),new ReportFragment(),new MessageFragment(),new MineFragment()};    private String mTitles[] = {"首页","报表","消息","我的"};    private int mImages[] = {            R.drawable.tab_home,            R.drawable.tab_report,            R.drawable.tab_message,            R.drawable.tab_mine    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(toolbar);        init();    }    private void init() {        initView();        initEvent();    }    private void initView() {        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);        mViewPager = (ViewPager) findViewById(R.id.view_pager);        mFragmentList = new ArrayList
      
       ();        mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);        mTabHost.getTabWidget().setDividerDrawable(null);        for (int i = 0;i < mFragment.length;i++){            TabHost.TabSpec tabSpec = mTabHost.newTabSpec(mTitles[i]).setIndicator(getTabView(i));            mTabHost.addTab(tabSpec,mClass[i],null);            mFragmentList.add(mFragment[i]);            mTabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.WHITE);        }        mViewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {            @Override            public Fragment getItem(int position) {                return mFragmentList.get(position);            }            @Override            public int getCount() {                return mFragmentList.size();            }        });    }    private View getTabView(int index) {        View view = LayoutInflater.from(this).inflate(R.layout.tab_item, null);        ImageView image = (ImageView) view.findViewById(R.id.image);        TextView title = (TextView) view.findViewById(R.id.title);        image.setImageResource(mImages[index]);        title.setText(mTitles[index]);        return view;    }    private void initEvent() {        mTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {            @Override            public void onTabChanged(String tabId) {                mViewPager.setCurrentItem(mTabHost.getCurrentTab());            }        });        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                mTabHost.setCurrentTab(position);            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}