转载自：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0731/3247.html
在开发中，我们常常需要ViewPager结合Fragment一起使用，如下图：
我们可以使用三方开源的PagerSlidingTabStrip去实现，或者viewpagerindicator，我一般都偏向前者。现在我们可以使用Design support library库的TabLayout去实现了。最终的效果图：
效果图
创建布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--app:tabMode="scrollable" 这个属性我在代码中设置了-->
<!-- tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);-->
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="@android:color/white" />
</LinearLayout>
在xml添加TabLayout，如同ViewPager，直接`android.support.design.widget.TabLayout`即可。还有其他的属性我会在代码中设置。
创建Fragment
package me.chenfuduo.myfragmentdemo.fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import me.chenfuduo.myfragmentdemo.R;
/**
* Created by Administrator on 2015/7/30.
*/
public class PageFragment extends Fragment {
public static final String ARG_PAGE = "ARG_PAGE";
private int mPage;
public static PageFragment newInstance(int page) {
Bundle args = new Bundle();
args.putInt(ARG_PAGE, page);
PageFragment pageFragment = new PageFragment();
pageFragment.setArguments(args);
return pageFragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPage = getArguments().getInt(ARG_PAGE);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_page, container, false);
TextView textView = (TextView) view;
textView.setText("Fragment #" + mPage);
return view;
}
}
其中Fragment的布局为：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
ViewPager的适配器
package me.chenfuduo.myfragmentdemo.adapter;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import me.chenfuduo.myfragmentdemo.fragment.PageFragment;
/**
* Created by Administrator on 2015/7/30.
*/
public class SimpleFragmentPagerAdapter extends FragmentPagerAdapter {
final int PAGE_COUNT = 3;
private String tabTitles[] = new String[]{"tab1","tab2","tab3"};
private Context context;
public SimpleFragmentPagerAdapter(FragmentManager fm,Context context) {
super(fm);
this.context = context;
}
@Override
public Fragment getItem(int position) {
return PageFragment.newInstance(position + 1);
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}
设置TabLayout
package me.chenfuduo.myfragmentdemo;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import me.chenfuduo.myfragmentdemo.adapter.SimpleFragmentPagerAdapter;
public class ThirdActivity extends FragmentActivity {
private SimpleFragmentPagerAdapter pagerAdapter;
private ViewPager viewPager;
private TabLayout tabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
pagerAdapter = new SimpleFragmentPagerAdapter(getSupportFragmentManager(), this);
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setAdapter(pagerAdapter);
tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setTabMode(TabLayout.MODE_FIXED);
}
}
这里提几点我遇到的问题
tabLayout.setTabMode(TabLayout.MODE_FIXED);
开始我设置的是：
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
运行后，三个TabLayout标签挤到一块去了。如下：
查看api，找到结果了。这个tabmode有两个属性值：
- 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.
不做过多的解释，MODE_SCROLLABLE适合很多tabs的情况。
此外：
setupWithViewPager必须在ViewPager.setAdapter()之后调用
以上就是最基本的用法，是不是很简单。哈~
定义TabLayout的样式
默认的情况下，TabLayout的tab indicator的颜色是Material Design中的accent color(#009688)，我们可以稍作修改：
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabIndicatorColor">#0000FF</item>
</style>
在布局中使用：
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
style="@style/MyCustomTabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
还有一些其他的样式可供选择：
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabMaxWidth">@dimen/tab_max_width</item>
<item name="tabIndicatorColor">?attr/colorAccent</item>
<item name="tabIndicatorHeight">2dp</item>
<item name="tabPaddingStart">12dp</item>
<item name="tabPaddingEnd">12dp</item>
<item name="tabBackground">?attr/selectableItemBackground</item>
<item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
<item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
<item name="android:textSize">14sp</item>
<item name="android:textColor">?android:textColorSecondary</item>
<item name="textAllCaps">true</item>
</style>