实现Tab功能

网上实现Tab功能的方法有很多，这里我使用Fragment的方法，我觉着比较简单易懂

MainActivity

     private android.app.FragmentManager fragmentManager;

     private FragmentOne fragmentOne;
     private FragmentTwo fragmentTwo;
     private FragmentThree fragmentThree;
     private FragmentFour fragmentFour;

     private RelativeLayout layoutOne, layoutTwo, layoutThree, layoutFour;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContent(R.layout.activity_main);
         initViews();
         fragmentManager = getFragmentManager();
         setTabSelection(0);
     }

     private void initViews(){
         layoutOne = (RelativeLayout) findViewById(R.id.layoutOne);
         layoutOne.setOnClickListener(this);
         //init所有的layout，并设置监听器
     }    

     @Override
     public void onClick(View v){
         switch(v.getId()){
             case R.id.layoutOne:
                 setTabSelection(0);
             //case 其余所有tab
             default:break;
         }
     }

     /**
      * 根据传入index参数来设置选中的tab页
      * @param index
      *
      */
     private void setTabSelection(int index){
         clearSelection();
         //开启fragment事物
         FragmentTransaction transaction = fragmentManager.beginTransaction();
         hideFragments(transaction);
         switch (index){
             //FragmentOne
             case 0:
                 if(fragmentMain == null){
                     fragmentOne = new FragmentOne();
                     transaction.add(R.id.content, fragmentOne);
                 }else {
                     transaction.show(fragmentOne);
                 }
                 clearSelection();
                 //set text color and image resource
                 break;
            //case 其余所有
         }
         transaction.commit();
     }

     /**
      * 清除所有选中状态
      *
      */
     private void clearSelection(){
         //set text color and image resource to default
     }

     /**
      * 将所有fragment设置为隐藏状态
      * @param transaction
      * 用于对Fragment执行操作的事务
      */
     private void hideFragments(FragmentTransaction transaction){
         if(fragmentOne != null){
             transaction.hide(fragmentOne);
         }
         if(fragmentTwo != null){
             transaction.hide(fragmentTwo);
         }
         if(fragmentThree != null){
             transaction.hide(fragmentThree);
         }
         if(fragmentFour != null){
             transaction.hide(fragmentFour);
         }
     }

activity_main.xml  注意：这里bottom为最下边的四个tab的布局，里边有上面代码中的layoutOne,layoutTwo,layoutThree,layoutFour

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/public_line_height"
            android:background="@color/background"/>
        <include
            android:id="@+id/layout_bottom"
            layout="@layout/bottom"
            android:layout_width="fill_parent"
            android:layout_height="@dimen/bottom_height"
            android:layout_alignParentBottom="true"/>

        <FrameLayout
            android:id="@+id/content"
            android:layout_above="@id/layout_bottom"
            android:layout_alignBottom="@id/layout_bottom"
            android:background="@color/background"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="@dimen/bottom_height"/>
    </RelativeLayout>

</LinearLayout>

四个Fragment直接继承Fragment就好

需要传递activity时

     private Context context;
     private View view;

     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View mainLayout = inflater.inflate(R.layout.fragment_main, container, false);
         context = this.getActivity();
         view = mainLayout;
         initView();
         return view;
     }

这样就可以通过context来进行操作了