Fragment中写频道管理+TabLayout+ViewPager关联+数据库

效果图


1.fragment页面

package com.example.mouth_lianxi01.ui.fragment;

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.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;

import com.andy.library.ChannelActivity;
import com.andy.library.ChannelBean;
import com.example.mouth_lianxi01.R;
import com.example.mouth_lianxi01.db.SqliteDao;
import com.example.mouth_lianxi01.ui.adaper.FilmAdaper;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

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

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

public class FilmFragment extends Fragment {

    private ImageButton imageButton;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private List<ChannelBean> select;
    private List<ChannelBean> datas;
    private FilmAdaper adaper;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.film_fragment,container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        //SqliteDao sqliteDao = new SqliteDao(getActivity());
        //获取资源id
        imageButton = view.findViewById(R.id.add_image);
        tabLayout = view.findViewById(R.id.film_tab);
        viewPager = view.findViewById(R.id.film_pager);
        //创建适配器
        adaper = new FilmAdaper(getChildFragmentManager());
        viewPager.setAdapter(adaper);
        tabLayout.setupWithViewPager(viewPager);
        initData();
    }
    private void initData() {
        datas = new ArrayList<>();
        datas.add(new ChannelBean("体育",false));
        datas.add(new ChannelBean("彩票",false));
        datas.add(new ChannelBean("推荐",false));
        datas.add(new ChannelBean("宠物",false));
        datas.add(new ChannelBean("直播",false));
        datas.add(new ChannelBean("房产",false));
        //数据库添加的方法
        SqliteDao.getIntance(getActivity()).addAll(datas);
        //数据库查询的方法
        select = SqliteDao.getIntance(getActivity()).select();
        adaper.setmData(getSelectResult(select));
        //加号点击
        imageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Gson gson = new Gson();
                //将查询出来的数据转换为json串
                String toJson = gson.toJson(select);
                Intent intent = new Intent(getActivity(),ChannelActivity.class);
                intent.putExtra(RESULT_JSON_KEY,toJson);
                startActivityForResult(intent,REQUEST_CODE);
            }
        });

    }
    //将频道中为true的栏目绑定到TabLayout
    public List<ChannelBean> getSelectResult(List<ChannelBean> datas){
        //创建新的集合将频道为true的数据存入集合中
            List<ChannelBean> result = new ArrayList<>();
            //遍历原来的集合
            for(ChannelBean bean:datas){
                //将为true的频道数据存入新的集合中
                if(bean.isSelect()){
                    result.add(bean);
                }
            }
        return result;
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
            if(requestCode == REQUEST_CODE && resultCode ==RESULT_CODE){
                String json = data.getStringExtra("json");
                select = new Gson().fromJson(json,new TypeToken<ArrayList<ChannelBean>>(){}.getType());
                adaper.setmData(getSelectResult(select));
                return;
            }
    }
}

2.布局页

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageButton
        android:id="@+id/add_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@id/film_tab"
        app:layout_constraintBottom_toBottomOf="@id/film_tab"
        android:src="@drawable/ic_action_name"
        />
    <android.support.design.widget.TabLayout
        android:id="@+id/film_tab"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/add_image"
        app:layout_constraintTop_toTopOf="parent"
        app:tabMode="scrollable"
        />
    <android.support.v4.view.ViewPager
        android:id="@+id/film_pager"
        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/film_tab"
        />
</android.support.constraint.ConstraintLayout>

3.适配器页

package com.example.mouth_lianxi01.ui.adaper;

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 com.example.mouth_lianxi01.ui.fragment.HotFragment;
import com.example.mouth_lianxi01.ui.fragment.JijiangFragment;
import com.example.mouth_lianxi01.ui.fragment.LestFragment;
import com.example.mouth_lianxi01.ui.fragment.ZhengzaiFragment;

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

public class FilmAdaper extends FragmentPagerAdapter {
   private List<ChannelBean> mData;
    public FilmAdaper(FragmentManager fm) {
        super(fm);
        mData = new ArrayList<>();
    }

    public void setmData(List<ChannelBean> mData) {
        this.mData = mData;
        notifyDataSetChanged();
    }

    @Override
    public Fragment getItem(int i) {
        switch (i){
            case 0:
                return new HotFragment();
            case 1:
                return new ZhengzaiFragment();
            case 2:
                return new JijiangFragment();
                default:
                    return new LestFragment();

        }
    }

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

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

4.数据库建表页 出始化添加一些数据

package com.example.mouth_lianxi01.db;

import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class SqliteHelper extends SQLiteOpenHelper {
    public SqliteHelper(Context context) {
        super(context, "Channel.db", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table channels(id integer primary key autoincrement," +
                "name text," +
                "isSelect boolean)");
        ContentValues values = new ContentValues();
        values.put("name","热门影片");
        values.put("isSelect",true);
        db.insert("channels",null,values);
        values.put("name","正在上映");
        values.put("isSelect",true);
        db.insert("channels",null,values);
        values.put("name","即将上映");
        values.put("isSelect",true);
        db.insert("channels",null,values);

        values.put("name","娱乐");
        values.put("isSelect",false);
        db.insert("channels",null,values);
        values.put("name","财经");
        values.put("isSelect",false);
        db.insert("channels",null,values);
        values.put("name","特卖");
        values.put("isSelect",false);
        db.insert("channels",null,values);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

5.数据库DAO页面

package com.example.mouth_lianxi01.db;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.andy.library.ChannelBean;

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

public class SqliteDao {
    private static SqliteDao intance;
    private final SqliteHelper sqliteHelper;
    private final SQLiteDatabase sb;

    public SqliteDao(Context context) {
        sqliteHelper = new SqliteHelper(context);
        sb = sqliteHelper.getWritableDatabase();
    }

    public static SqliteDao getIntance(Context context) {
        if(intance==null){
            intance = new SqliteDao(context);
        }
        return intance;
    }
    //查询
    public List<ChannelBean> select(){
        List<ChannelBean> list = new ArrayList<>();
        Cursor channels = sb.query("channels", null, null, null, null,
                null, null, null);
        if(channels!=null){
            while (channels.moveToNext()){
                String name = channels.getString(channels.getColumnIndex("name"));
                boolean isSelect = channels.getInt(channels.getColumnIndex("isSelect")) == 1 ? true:false;
                ChannelBean bean = new ChannelBean(name,isSelect);
                list.add(bean);
            }
            channels.close();
        }
        return list;
    }
    //添加
    public void add(ChannelBean bean){
        ContentValues values = new ContentValues();
        values.put("name",bean.getName());
        values.put("isSelect",bean.isSelect());
        sb.insert("channels",null,values);
    }

    public void addAll(List<ChannelBean> datas){
        try {
            sb.beginTransaction();
            for (ChannelBean bean:datas){
                add(bean);
            }
            sb.setTransactionSuccessful();
        }finally {
            sb.endTransaction();
        }
    }
}