浅谈TabLayout(ViewPager+Tab联动)

google发布了的Android Support Design库中提供了TabLayout

通过TabLayout+ViewPager实现导航栏效果,点击Tab ，ViewPager跟随变化，滑动ViewPager，Tab跟随变化

看效果图：

通过一个Demo来了解TabLayout的简单使用（Android Studio开发）,代码中都有注释了 ，很简单

1、build.gradle文件中加入

compile 'com.android.support:design:22.2.0'

2、写Xml文件，注意TabLayout的三个属性

app:tabIndicatorColor="#0f0"                每个tab下方的下划线的颜色
app:tabSelectedTextColor="#00f"             被选中的tab的文本颜色
app:tabTextColor="#f00"                     未被选中的tab的文本颜色

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context=".MainActivity">

     <android.support.design.widget.TabLayout
         android:id="@+id/tablayout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="#777"
         app:tabIndicatorColor="#0f0"
         app:tabSelectedTextColor="#00f"
         app:tabTextColor="#f00"
         />

     <android.support.v4.view.ViewPager
         android:id="@+id/viewpager"
         android:layout_width="fill_parent"
         android:layout_height="0dp"
         android:layout_weight="1"
         android:background="#cccc"
         />

 </LinearLayout>

activity_main.xml

3、创建4个fragment

这里只创建一个，其他三个类似

 package com.xqx.com.tablayoutdemo;

 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;

 /**
  * A simple {@link Fragment} subclass.
  */
 public class OneFragment extends Fragment {

     public OneFragment() {
         // Required empty public constructor
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         // Inflate the layout for this fragment
         return inflater.inflate(R.layout.fragment_one, container, false);
     }

 }

OneFragment

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

     <!-- TODO: Update blank fragment layout -->
     <TextView android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_gravity="center"
         android:gravity="center"
         android:text="第一个fragment界面" />

 </LinearLayout>

fragment_one

4、创建ViewPager的适配器

 package com.xqx.com.tablayoutdemo;

 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;

 import java.util.List;

 public class MyAdapter extends FragmentPagerAdapter{

     private List<Fragment> fragments;           //fragment集合
     private List<String> titles;                //tab标题集合

     public MyAdapter(FragmentManager fm, List<Fragment> fragments, List<String> titles) {
         super(fm);
         this.fragments = fragments;
         this.titles = titles;
     }

     @Override
     public Fragment getItem(int position) {
         return fragments.get(position);
     }

     @Override
     public int getCount() {
         int ret = 0;
         if (fragments!=null && fragments.size()!=0){
             ret = fragments.size();
         }
         return ret;
     }

     @Override
     public CharSequence getPageTitle(int position) {
         return titles.get(position);
     }

 }

MyAdapter.java

5、MainActivity.java

 package com.xqx.com.tablayoutdemo;

 import android.support.design.widget.TabLayout;

 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.view.ViewPager;
 import android.os.Bundle;

 import java.util.ArrayList;
 import java.util.List;

 public class MainActivity extends FragmentActivity {

     private TabLayout tabLayout;
     private ViewPager viewPager;

     //四个fragment
     private OneFragment oneFragment;
     private TwoFragment twoFragment;
     private ThreeFragment threeFragment;
     private FourFragment fourFragment;

     //适配器
     private MyAdapter adapter;

     private List<Fragment> fragments;           //fragment集合
     private List<String> titles;                //tab标题集合
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         tabLayout = (TabLayout) findViewById(R.id.tablayout);
         viewPager = (ViewPager) findViewById(R.id.viewpager);

         //创建四个Fragment对象
         oneFragment = new OneFragment();
         twoFragment = new TwoFragment();
         threeFragment = new ThreeFragment();
         fourFragment = new FourFragment();

         //将四个Fragment对象添加到集合中
         fragments = new ArrayList<>();
         fragments.add(oneFragment);
         fragments.add(twoFragment);
         fragments.add(threeFragment);
         fragments.add(fourFragment);

         //给Tab添加标题
         titles = new ArrayList<>();
         titles.add("one");
         titles.add("two");
         titles.add("three");
         titles.add("four");

         //创建适配器
         adapter = new MyAdapter(getSupportFragmentManager(),fragments,titles);
         //viewpager绑定适配器
         viewPager.setAdapter(adapter);
         //tabLayout绑定viewpager
         tabLayout.setupWithViewPager(viewPager);

     }

 }

MainActivity.java

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