draggrid 频道管理+Viewpager

此文章的基础写法与《draggrid 频道管理》文章相同
写一些改动的地方
fragmentone，two，three，four为Fragment
activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <android.support.design.widget.TabLayout
        android:id="@+id/tab"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toLeftOf="@id/jia"
        ></android.support.design.widget.TabLayout>
    <ImageButton
        android:id="@+id/jia"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        app:layout_constraintRight_toRightOf="parent"
        android:src="@drawable/jia"
        />
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tab"
        ></android.support.v4.view.ViewPager>
</android.support.constraint.ConstraintLayout>

适配器：
FragmentPagerAdapter:
MyPager:

package guopuran.bwie.com.space08;

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

import com.andy.library.ChannelBean;

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

public class MyPager extends FragmentPagerAdapter {
    private List<ChannelBean> list=new ArrayList<>();

    public void setList(List<ChannelBean> list) {
        this.list = list;
        notifyDataSetChanged();
    }

    public MyPager(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        switch (i){
            case 0:
                return new Fragmentone();
            case 1:
                return new Fragmenttwo();
            case 2:
                return new Fragmentthree();
            default:
                return new Fragmentfour();
        }
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return list.get(position).getName();
    }

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

Activity:
改动的地方：
给tablayout写标题时改成自动添加
给适配器传list集合时提供一个方法只给selecked为true的数据：

public class MainActivity extends AppCompatActivity {

    private TabLayout tab;
    private ImageButton jia;
    private List<ChannelBean> list;
    private String jsonStr="";
    private ViewPager viewPager;
    private MyPager myPager;
    private int count=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取资源ID
        tab = findViewById(R.id.tab);
        jia = findViewById(R.id.jia);
        viewPager = findViewById(R.id.viewpager);
        //设置适配器
        myPager = new MyPager(getSupportFragmentManager());
        viewPager.setAdapter(myPager);
        initData();
    }

    private void initData() {
        list=new ArrayList<>();
        list.add(new ChannelBean("热点", true));
        list.add(new ChannelBean("军事", true));
        list.add(new ChannelBean("八卦", true));
        list.add(new ChannelBean("游戏", true));
        list.add(new ChannelBean("宠物", true));
        list.add(new ChannelBean("汽车", true));
        list.add(new ChannelBean("热卖", true));
        list.add(new ChannelBean("外卖", true));
        list.add(new ChannelBean("条目1", true));
        list.add(new ChannelBean("条目2", true));
        list.add(new ChannelBean("条目3", false));
        list.add(new ChannelBean("条目4", false));
        list.add(new ChannelBean("条目5", false));
        list.add(new ChannelBean("条目6", false));
        list.add(new ChannelBean("条目7", false));
        list.add(new ChannelBean("条目8", false));
        myPager.setList(findSelectedResult(list));
        tab.setupWithViewPager(viewPager);
        jia.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                ChannelActivity.startChannelActivity(MainActivity.this,list);

            }
        });
    }
    //获得selecked为true的数据
    private List<ChannelBean> findSelectedResult(List<ChannelBean> datas) {
        List<ChannelBean> cc=new ArrayList<>();
        for (int i=0;i<datas.size();i++){
            if (datas.get(i).isSelect()){
                cc.add(datas.get(i));
            }
        }
        return cc;
    }

    protected void onActivityResult(int requestCode, int resultCode,Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==ChannelActivity.REQUEST_CODE&&resultCode==ChannelActivity.RESULT_CODE){
            //获得栏目管理的字符串
            jsonStr=data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
            // 把新选择的栏目结果更新到TabLayout上
            //清空之前的栏目
            tab.removeAllTabs();
            Type type=new TypeToken<ArrayList<ChannelBean>>(){}.getType();
            //进行json解析
            list = new Gson().fromJson(jsonStr, type);
            //传给适配器
            myPager.setList(findSelectedResult(list));
            tab.setupWithViewPager(viewPager);
        }

    }
}