Fragment嵌套Fragment和Viewpager

import android.app.Fragment;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.support.annotation.IdRes;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.RadioGroup;import java.util.ArrayList;import java.util.List;import l.framgsradiogroupviewpager.Framgs.framg1;import l.framgsradiogroupviewpager.Framgs.framg2;import l.framgsradiogroupviewpager.Framgs.framg3;//首先创建fragment在MainActivity中和RadioGroup一起使用,之后再第一个Fragment中 布局ViewPaegr再ViewPager总添加Fragment,在布局ListView添加适配器即可,//fragment中嵌套子fragment要用getChildFragmentManager()public class MainActivity extends AppCompatActivity {    private RadioGroup rg;    private android.support.v4.app.FragmentManager supportFragmentManager;    private android.support.v4.app.FragmentTransaction fragmentTransaction;    private framg1 f1;    private framg2 f2;    private framg3 f3;    private List<Fragment> list = new ArrayList<Fragment>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取控件        rg = (RadioGroup) findViewById(R.id.rg);        //获取管理者        supportFragmentManager = getSupportFragmentManager();        //开启事务        fragmentTransaction = supportFragmentManager.beginTransaction();        //实例化碎片        f1 = new framg1();        //默认一个页面        fragmentTransaction.add(R.id.fl, f1).commit();        //获取点击事件        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {                //隐藏所用的Frangment                hideFrag();                //在获取一个开启事务                android.support.v4.app.FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();                switch (i) {                    case R.id.rb:                        fragmentTransaction.show(f1).commit();                        break;                    case R.id.rb1:                        //如果等于空                        if (f2 == null) {                            f2 = new framg2();//实例化一个Frang2                            fragmentTransaction.add(R.id.fl, f2).commit();//添加布局里                        } else {                            fragmentTransaction.show(f2).commit();//有的话就show                        }                        break;                    case R.id.rb2:                        if (f3 == null) {                            f3 = new framg3();                            fragmentTransaction.add(R.id.fl, f3).commit();                        } else {                            fragmentTransaction.show(f3).commit();                        }                        break;                }            }        });    }    //隐藏所用的Frangment    private void hideFrag() {        //在获取一个开启事务        android.support.v4.app.FragmentTransaction fragmentTransaction = supportFragmentManager.beginTransaction();        //不等于空或者是否添加        if (f1 != null && f1.isAdded()) {            fragmentTransaction.hide(f1);//隐藏        }        //不等于空或者是否添加        if (f2 != null && f2.isAdded()) {            fragmentTransaction.hide(f2);//隐藏        }        if (f3 != null && f3.isAdded()) {            fragmentTransaction.hide(f3);        }        fragmentTransaction.commit();    }}

//在第一个Fragment中添加Viewpager,加载多个Fragment  
package l.framgsradiogroupviewpager.Framgs;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;import java.util.List;import l.framgsradiogroupviewpager.R;/** * Created by lenovo on 2017/11/9. */public class framg1 extends Fragment {    private ViewPager vp;    List<Fragment> fragmentlist=new ArrayList<>();    //只写加载布局和找到控件    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        View inflate = inflater.inflate(R.layout.f1, container, false);        return inflate;    }    /**     * 写fragment的逻辑；     * @param view     * @param savedInstanceState     */    @Override    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);         //集合数据        getlist();        vp = (ViewPager)view.findViewById(R.id.vp);         //fragment中嵌套子fragment要用getChildFragmentManager()        Myadapter my=new Myadapter(getChildFragmentManager());        vp.setAdapter(my);    }    private void getlist() {        charfrang1 c1=new charfrang1();        charfrang2 c2=new charfrang2();        fragmentlist.add(c1);        fragmentlist.add(c2);    }    class Myadapter extends FragmentPagerAdapter{        public Myadapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            return fragmentlist.get(position);        }        @Override        public int getCount() {            return fragmentlist.size();        }    }}