这里我们用TabLayout来实现这一效果。TabLayout是Android Design Support Library库中的控件。
Google在2015的IO大会上，给我们带来了更加详细的Material Design设计规范，同时，也给我们带来了全新的Android Design Support Library，在这个support库里面，Google给我们提供了更加规范的MD设计风格的控件。最重要的是，Android Design Support Library的兼容性更广，直接可以向下兼容到Android 2.2。首先我们先来看看效果：
接下来开始实现
1. 配置build.gradle
在build.gradle加入如下代码
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:22.2.0' compile 'com.android.support:design:22.2.0' compile 'com.android.support:recyclerview-v7:22.2.0' compile 'com.android.support:cardview-v7:22.2.0' } com.android.support:design:22.2.0就是我们需要引入的Android Design Support Library，其次我们还引入了Recyclerview和Cardview,还不了解这两个控件的同学可以看下面这两篇文章：
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2.AppBarLayout,Toolbar与TabLayout
先看看主界面的布局 （activity_tab_layout.xml）这里用到了AppBarLayout和Toolbar，AppBarLayout是Android Design Support Library新加的控件继承自LinearLayout，它用来将Toolbar和TabLayout组合起来作为一个整体。Toolbar我们在这里不讲了，如果不熟悉可以看这篇文章
这布局文件最关键的一点就是android.support.design.widget.TabLayout 标签中的app:tabMode="scrollable"，他设置tab的模式为“可滑动的”,现在我们把这句话去掉，来看看效果：上面的tab由于太多（13个）却不能滑动就重叠了。
接下来在java中引用 （TabLayoutActivity.java）
package com.example.liuwangshu.mytablayout;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment; import android.support.v4.view.ViewPager; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.Toolbar; import java.util.ArrayList; import java.util.List; public class TabLayoutActivity extends AppCompatActivity { private DrawerLayout mDrawerLayout; private ViewPager mViewPager; private TabLayout mTabLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tab_layout); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mViewPager = (ViewPager) findViewById(R.id.viewpager); initViewPager(); } initViewPager方法 （TabLayoutActivity.java）
private void initViewPager() { mTabLayout = (TabLayout) findViewById(R.id.tabs); List titles = new ArrayList<>(); titles.add("精选"); titles.add("体育"); titles.add("巴萨"); titles.add("购物"); titles.add("明星"); titles.add("视频"); titles.add("健康"); titles.add("励志"); titles.add("图文"); titles.add("本地"); titles.add("动漫"); titles.add("搞笑"); titles.add("精选"); for(int i=0;i fragments = new ArrayList<>(); for(int i=0;i 在这里我们设定了13个标题内容并创建了相应的TabLayout和Fragment，设置了ViewPager适配器和TabLayout适配器并将将TabLayout和ViewPager关联起来。
ListFragment的代码（ListFragment.java)package com.example.liuwangshu.mytablayout;import android.os.Bundle;import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class ListFragment extends Fragment { private RecyclerView mRecyclerView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mRecyclerView = (RecyclerView) inflater.inflate(R.layout.list_fragment, container, false); return mRecyclerView; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext())); mRecyclerView.setAdapter(new RecyclerViewAdapter(getActivity())); } } 这里用RecyclerView来代替ListView来看看RecyclerViewAdapter（RecyclerViewAdapter.java)
package com.example.liuwangshu.mytablayout;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ObjectAnimator; import android.annotation.TargetApi; import android.content.Context; import android.content.Intent; import android.os.Build; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class RecyclerViewAdapter extends RecyclerView.Adapter{ private Context mContext; public RecyclerViewAdapter(Context mContext) { this.mContext = mContext; } @Override public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_card_main, parent, false); return new ViewHolder(view); } @Override public void onBindViewHolder(final RecyclerViewAdapter.ViewHolder holder, int position) { final View view = holder.mView; view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); } @Override public int getItemCount() { return 10; } public static class ViewHolder extends RecyclerView.ViewHolder { public final View mView; public ViewHolder(View view) { super(view); mView = view; } } }
最后FragmentAdapter（FragmentAdapter.java)
package com.example.liuwangshu.mytablayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentStatePagerAdapter;import java.util.List; public class FragmentAdapter extends FragmentStatePagerAdapter { private List mFragments; private List mTitles; public FragmentAdapter(FragmentManager fm, List fragments, List titles) { super(fm); mFragments = fragments; mTitles = titles; } @Override public Fragment getItem(int position) { return mFragments.get(position); } @Override public int getCount() { return mFragments.size(); } @Override public CharSequence getPageTitle(int position) { return mTitles.get(position); } } 基本所有的代码都讲到了，当然这种稍微复杂的效果TabLayout能够实现，那么简单的3，4个Tab滑动TabLayout实现起来更是不再话下，修改TabLayoutActivity的initViewPager方法（TabLayoutActivity.java)
private void initViewPager() { mTabLayout = (TabLayout) findViewById(R.id.tabs); List titles = new ArrayList<>(); titles.add("精选"); titles.add("体育"); titles.add("巴萨"); titles.add("购物"); for(int i=0;i fragments = new ArrayList<>(); for(int i=0;i 我们只保留了4个Tab,然后去掉activity_tab_layout.xml android.support.design.widget.TabLayout 标签中的app:tabMode="scrollable"
运行代码来看看效果好了讲到这里，预告：接下来我们会讲到Android Design Support Library提供的其他的控件