原文地址: https://blog.csdn.net/zhuwentao2150/article/details/52279133
google提供的Design开发包里，有很多实用好看的新控件，这里介绍下使用TabLayout+ViewPager实现下划线能滑动的Tab标签页
效果图 
不使用google的design包，我们也可以自己制作这样的效果，详看我的这篇博客：http://blog.csdn.net/zhuwentao2150/article/details/51407661
要使用Design包，在项目的build.gradle中添加下依赖就好（记得更新SDK到最新版本）
dependencies {
compile 'com.android.support:design:23.4.0'
}- 1
- 2
- 3
先来看布局
<?xml version="1.0" encoding="utf-8"?>
<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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
app:tabSelectedTextColor="#ffffff"
app:tabIndicatorColor="#ff00ff"
app:tabTextColor="#000000"
app:tabIndicatorHeight="5dp"
app:tabMode="fixed"/>
<android.support.v4.view.ViewPager
android:id="@+id/vp_tab_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>常用属性
tabSelectedTextColor：当Tab标签被选中时的文字颜色
tabTextColor：Tab标签中文字的默认颜色
tabIndicatorColor：下划线颜色
tabIndicatorHeight：下划线的高度
tabBackground：设置Tab标签的背景
tabMode：Tab标签的行为模式
MODE_FIXED: Fixed tabs display all tabs concurrently and are best used with content that benefits from quick pivots between tabs.
MODE_SCROLLABLE: Scrollable tabs display a subset of tabs at any given moment, and can contain longer tab labels and a larger number of tabs. They are best used for browsing contexts in touch interfaces when users don’t need to directly compare the tab labels. This mode is commonly used with a ViewPager.
两种模式的差异：
tabMode=”scrollable”
滚动模式，TabLayout可以滚动
标签多时，TabLayout支持滑动查看 
标签少时，，这些Tab会挤在一侧，且各个Tab不是等量分布的，有的占地多有的占地少
tabMode=”fixed”
填充模式，TabLayout不可滚动，所有的Tab都被限制在一定区域内
标签多时，Tab会受到挤压
Tab少时，各个Tab等量空间分布
Fragment页面
/**
* ViewPager页面
* Created by zhuwentao on 2016-08-22.
*/
public class ViewPagerFragment extends Fragment{
private String mPageNo;
private TextView mPageNoTv;
/** 状态类型常量 */
public static final String STATUS_TYPE = "pagerType";
public static final String STATUS_ONE = "One";
public static final String STATUS_TWO = "Two";
public static final String STATUS_THREE = "Three";
/**
* 取得Fragment实例
*/
public static ViewPagerFragment newInstance(Bundle args) {
ViewPagerFragment fragment = new ViewPagerFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPageNo = getArguments().getString(STATUS_TYPE);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_tab, container, false);
mPageNoTv = (TextView) v.findViewById(R.id.tv_page_text);
mPageNoTv.setText(mPageNo);
return v;
}
}Activity界面
public class TabLayoutActivity extends AppCompatActivity {
private ViewPager mPageVp;
private TabLayout mLayoutTab;
/**
* 选项卡总数
*/
private static final int TAB_COUNT = 3;
private static final int TAB_0 = 0;
private static final int TAB_1 = 1;
private static final int TAB_2 = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab_layout);
initUI();
}
/**
* 初始化UI
*/
private void initUI() {
mPageVp = (ViewPager) findViewById(R.id.vp_tab_pager);
mLayoutTab = (TabLayout) findViewById(R.id.tab_layout);
mPageVp.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
// 把TabLayout和ViewPager关联起来
mLayoutTab.setupWithViewPager(mPageVp);
}
/**
* ViewPager适配器
*/
public class MyPagerAdapter extends FragmentPagerAdapter {
// 定义Tab标题
private String[] tabTitles = new String[]{
"One","Two","Three"
};
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Bundle args = new Bundle();
boolean flag = true;
switch (position) {
case TAB_0:
args.putString(ViewPagerFragment.STATUS_TYPE, ViewPagerFragment.STATUS_ONE);
break;
case TAB_1:
args.putString(ViewPagerFragment.STATUS_TYPE, ViewPagerFragment.STATUS_TWO);
break;
case TAB_2:
args.putString(ViewPagerFragment.STATUS_TYPE, ViewPagerFragment.STATUS_THREE);
break;
default:
flag = false;
break;
}
if (flag) {
// 返回对应的Fragment页面
return ViewPagerFragment.newInstance(args);
}
return null;
}
@Override
public int getCount() {
return TAB_COUNT;
}
@Override
public CharSequence getPageTitle(int position) {
// 设置Page对应的Tab标题
return tabTitles[position];
}
}
}调用setupWithViewPager()方法传入一个ViewPager对象，请确保该ViewPager对象已经通过setAdapter设置好了Adapter适配器
从源码可以看出
public void setupWithViewPager(@Nullable final ViewPager viewPager) {
if (mViewPager != null && mPageChangeListener != null) {
// If we've already been setup with a ViewPager, remove us from it
mViewPager .removeOnPageChangeListener( mPageChangeListener);
}
if (viewPager != null ) {
final PagerAdapter adapter = viewPager.getAdapter();
if (adapter == null) {
throw new IllegalArgumentException( "ViewPager does not have a PagerAdapter set");
}
// ......如果ViewPager的Adapter为空，则会抛出IllegalArgumentException异常
把 TabLayout和 ViewPager 关联起来，该方法相当于帮我们封装好了 addOnPageChangeListener 和setOnTabSelectedListener ，帮我们节省了大量的代码。