频道管理

看看效果（点击可以我的频道和更多频道来回切换并且会相应删除或添加fragment）

先在build里添加

maven {url "https://jitpack.io"}

导入依赖

compile 'com.github.andyoom:draggrid:v1.0.1'

MainActivity里添加fragment时候

写一个返回方法

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Fragment frag = getSupportFragmentManager().findFragmentByTag("frag");
        frag.onActivityResult(requestCode, resultCode, data);
    }

XML文件里的代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"></android.support.design.widget.TabLayout>
        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+"/>
    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>
</LinearLayout>

Frag1里面的代码

package com.example.yklianxi;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.andy.library.ChannelActivity;
import com.andy.library.ChannelBean;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.ArrayList;

public class Frag1 extends Fragment {
    ArrayList<Fragment> flist = new ArrayList<Fragment>();
    ArrayList<ChannelBean> clist = new ArrayList<ChannelBean>();
    private TabLayout tabLayout;
    private ViewPager pager;
    private Button button;
    private MPagerAdapter mPagerAdapter;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.frag1,container,false);
        //找控件
        tabLayout = view.findViewById(R.id.tabLayout);
        pager = view.findViewById(R.id.viewPager);
        button = view.findViewById(R.id.button);
        init();//数据方法
        mPagerAdapter = new MPagerAdapter(getActivity().getSupportFragmentManager());
        pager.setAdapter(mPagerAdapter);//设置adapter
        tabLayout.setTabMode(TabLayout.MODE_FIXED);//设置模式
        tabLayout.setupWithViewPager(pager);//联动
        //点击进入频道管理
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转
                ChannelActivity.startChannelActivity((AppCompatActivity) getActivity(),clist);
            }
        });
        return view;
    }

    //添加数据方法
    private void init() {
        clist.add(new ChannelBean("标题1",true));
        clist.add(new ChannelBean("标题2",true));
        clist.add(new ChannelBean("标题3",true));
        clist.add(new ChannelBean("标题4",false));
        clist.add(new ChannelBean("标题5",false));
        clist.add(new ChannelBean("标题6",false));
        for (int i = 0 ; i<clist.size() ; i ++){
            if(clist.get(i).isSelect()){
                String tabname = clist.get(i).getName();
                tabLayout.addTab(tabLayout.newTab().setText(tabname));
                if(i == 0){
                    flist.add(new FFrag1());
                }else {
                    flist.add(new FFrag());
                }
            }
        }
    }

    //返回
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String json = data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
        Type type = new TypeToken<ArrayList<ChannelBean>>() {
        }.getType();
        Gson gson = new Gson();
        clist = gson.fromJson(json,type);
        tabLayout.removeAllTabs();
        flist.clear();
        for (int i = 0;i<clist.size();i++){
            ChannelBean channelBean = clist.get(i);
            if(channelBean.isSelect()){
                String tabname = clist.get(i).getName();
                tabLayout.addTab(tabLayout.newTab().setText(tabname));
                if("标题1".equals(channelBean.getName())){
                    flist.add(new FFrag1());
                }else{
                    flist.add(new FFrag());
                }
            }
        }
        mPagerAdapter.notifyDataSetChanged();
    }

    //设置MPagerAdapter
    private class MPagerAdapter extends FragmentPagerAdapter {
        public MPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            return flist.get(i);
        }

        @Override
        public int getCount() {
            return flist.size();
        }
        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            return clist.get(position).getName();
        }
    }
}