第三方频道管理

**

在工程中导入依赖

**

implementation \'com.google.code.gson:gson:2.8.5\'
   implementation \'com.android.support:design:27.1.1\'
    implementation \'com.github.andyoom:draggrid:v1.0.1\'

**

在build.gradle里添加

**

allprojects {
                repositories {
                    google()
                    jcenter()
                    maven {url \"https://jitpack.io\"}
                }
            }

**

activity_main页面 布局可自定义

**

<?  version=\"1.0\" encoding=\"utf-8\"?>
<android.support.constraint.ConstraintLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
     ns:app=\"http://schemas.android.com/apk/res-auto\"
     ns:tools=\"http://schemas.android.com/tools\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    tools:context=\".MainActivity\">

    <TextView
        android:id=\"@+id/text\"
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"
        android:text=\"+\"
        android:textSize=\"40dp\"
        android:layout_marginRight=\"5dp\"
        app:layout_constraintBottom_toTopOf=\"@id/viewpager\"
        app:layout_constraintTop_toTopOf=\"parent\"
        app:layout_constraintRight_toRightOf=\"parent\"
         />
    <android.support.design.widget.TabLayout
        android:layout_width=\"0dp\"
        android:layout_height=\"60dp\"
        android:id=\"@+id/tab\"
        app:layout_constraintLeft_toLeftOf=\"parent\"
        app:layout_constraintTop_toTopOf=\"parent\"
        app:layout_constraintRight_toLeftOf=\"@+id/text\"
        app:tabMode=\"scrollable\"
        ></android.support.design.widget.TabLayout>
    <android.support.v4.view.ViewPager
        android:layout_width=\"0dp\"
        android:layout_height=\"0dp\"
        android:id=\"@+id/viewpager\"
        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>

**

MainActivity页面

**

package com.example.lx_pdgl;

import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

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;
import java.util.List;

import static com.andy.library.ChannelActivity.REQUEST_CODE;
import static com.andy.library.ChannelActivity.RESULT_JSON_KEY;

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private List<ChannelBean> channelBeans = new ArrayList<>();
    private List<Fragment> fragments = new ArrayList<>();
    private String jsonStr = \"\";
    private Gson gson;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.text);
        tabLayout = findViewById(R.id.tab);
        viewPager = findViewById(R.id.viewpager);

        gson = new Gson();

        initData();
    }

    private void initData(){
        channelBeans.add(new ChannelBean(\"热点\",true));
        channelBeans.add(new ChannelBean(\"军事\",true));
        channelBeans.add(new ChannelBean(\"八卦\",true));
        channelBeans.add(new ChannelBean(\"游戏\",true));
        channelBeans.add(new ChannelBean(\"宠物\",true));
        channelBeans.add(new ChannelBean(\"汽车\",true));
        channelBeans.add(new ChannelBean(\"热卖\",true));
        channelBeans.add(new ChannelBean(\"外卖\",true));
        channelBeans.add(new ChannelBean(\"条目1\",true));
        channelBeans.add(new ChannelBean(\"条目2\",true));
        channelBeans.add(new ChannelBean(\"条目3\",true));
        channelBeans.add(new ChannelBean(\"条目4\",true));
        channelBeans.add(new ChannelBean(\"条目5\",true));
        channelBeans.add(new ChannelBean(\"条目6\",true));
        channelBeans.add(new ChannelBean(\"条目7\",true));
        channelBeans.add(new ChannelBean(\"条目8\",true));
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());
        fragments.add(new AFragment());
        fragments.add(new BFragment());
        fragments.add(new CFragment());

        for (int i=0;i<channelBeans.size();i++){
            if (channelBeans.get(i).isSelect()){
                tabLayout.addTab(tabLayout.newTab().setText(channelBeans.get(i).getName()));
            }
        }

        //viewpager设置适配器
        viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return fragments.get(position);
            }

            @Override
            public int getCount() {
                int count=0;//返回选中的条目数量
                for (int i=0;i<channelBeans.size();i++){
                    if (channelBeans.get(i).isSelect()){
                        count++;
                    }
                }
                return count;
            }

            @Nullable
            @Override
            public CharSequence getPage (int position) {
                return channelBeans.get(position).getName();
            }
        });
        tabLayout.setupWithViewPager(viewPager);
        textView.set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                String jsonArray = gson.toJson(channelBeans);
                Intent intent = new Intent(MainActivity.this,ChannelActivity.class);
                intent.putExtra(RESULT_JSON_KEY, jsonArray);
                startActivityForResult(intent, REQUEST_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==ChannelActivity.REQUEST_CODE&&resultCode==ChannelActivity.RESULT_CODE){
            //得到栏目管理的结果
            jsonStr=data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
            //清空之前所有的栏目
            tabLayout.removeAllTabs();
            //进行gson解析
            Type type = new TypeToken<List<ChannelBean>>() {}.getType();
            channelBeans=gson.fromJson(jsonStr,type);
            //循环存入
            for (int i=0;i<channelBeans.size();i++){
                if (channelBeans.get(i).isSelect()){
                    try {
                        tabLayout.addTab(tabLayout.newTab().setText(channelBeans.get(i).getName()));
                    }catch (Exception e){

                    }
                }
                //viewpager适配器刷新
                viewPager.getAdapter().notifyDataSetChanged();
            }
        }
    }
}