ViewPager,RadioGroup,FragmentManager 详解 <四> Fragment，ViewPager 和TabLayout

这个TabLayout和PagerTabStrip类似，区别在于：

0：布局不同,这个TabLayout 是在ViewPager 的外面,而且是上面.

1：注意这个TabLayout 是design 包里面的.

2：最关键的一个代码就是,而且这个要在设置完了adapter 之后再执行.

tabLayout.setupWithViewPager(mComicViewPager);

0：创建Fragment

1：创建布局，注意布局里面TabLayout 不是在ViewPager 里面，而是在ViewPager的上面，还有TabLayout 是design 包里面的，所以要引入design的包

<?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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tablayout"
>
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="@+id/viewPager"></android.support.v4.view.ViewPager>

</LinearLayout>

2：然后设置adapter，

这个adapter 和使用PagerTabStrip 的时候是一样的。都是在getPagerTitle 里面进行Tab的标题的设置。

package tech.androidstudio.tablayoutviewpagerdemo.adapter;

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

import java.util.List;

/**
* Created by Kodulf on 2016/3/14.
*/
public class TabLayoutFragmentPagerAdapter extends FragmentPagerAdapter {
List<Fragment> list;

public TabLayoutFragmentPagerAdapter(FragmentManager fm, List<Fragment> list) {
super(fm);
this.list = list;
}

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

@Override
public int getCount() {
return list.size();
}

@Override
public CharSequence getPageTitle(int position) {
//        return super.getPageTitle(position);
String ret;
switch (position){
case 0:
ret="财经";
break;
case 1:
ret="体育";
break;
case 2:
ret="娱乐";
break;
default:
ret="未命名";
break;
}
return ret;
}
}

3：MainActivity

最关键的一个代码就是,而且这个要在设置完了adapter 之后再执行.

tabLayout.setupWithViewPager(mComicViewPager);

package tech.androidstudio.tablayoutviewpagerdemo;

import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

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

import tech.androidstudio.tablayoutviewpagerdemo.adapter.TabLayoutFragmentPagerAdapter;

public class MainActivity extends AppCompatActivity {

private TabLayout mTabLayout;
private ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabLayout = (TabLayout)findViewById(R.id.tablayout);
mViewPager = (ViewPager)findViewById(R.id.viewPager);

List<Fragment> mList = new ArrayList<Fragment>();
mList.add(new FirstFragment());
mList.add(new SecondFragment());
mList.add(new ThirdFragment());

TabLayoutFragmentPagerAdapter adapter = new TabLayoutFragmentPagerAdapter(getSupportFragmentManager(),mList);

//一定要先设置adapter ，然后在使用命令mTabLayout.setupWithViewPager(mViewPager);
mViewPager.setAdapter(adapter);
//这一步是最关键，将tablayout 和viewpager 连接起来了
mTabLayout.setupWithViewPager(mViewPager);

}
}