网络获取数据工具类

package news1510a.bawei.com.a14_zhoukao_test;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioGroup;

import news1510a.bawei.com.a14_zhoukao_test.fragment.FragmentHome;
import news1510a.bawei.com.a14_zhoukao_test.fragment.FragmentMarket;
import news1510a.bawei.com.a14_zhoukao_test.fragment.FragmentMore;
import news1510a.bawei.com.a14_zhoukao_test.fragment.FragmentNotify;
import news1510a.bawei.com.a14_zhoukao_test.fragment.FragmentXiangFa;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        radioGroup = (RadioGroup) findViewById(R.id.radio_group);

        //默认显示
        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentHome()).commit();

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                switch (i){
                    case R.id.radio_01:
                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentHome()).commit();
                        break;
                    case R.id.radio_02:
                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentXiangFa()).commit();
                        break;
                    case R.id.radio_03:
                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentMarket()).commit();
                        break;
                    case R.id.radio_04:
                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentNotify()).commit();
                        break;
                    case R.id.radio_05:
                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new FragmentMore()).commit();
                        break;
                    default:
                        break;
                }
            }
        });
    }

}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

activity_main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_above="@+id/radio_group"
        android:id="@+id/frame_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>

    <RadioGroup
        android:id="@+id/radio_group"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">

        <RadioButton
            android:id="@+id/radio_01"
            android:padding="10dp"
            android:button="@null"
            android:gravity="center"
            android:background="@drawable/radio_selector"

            android:checked="true"
            android:text="首页"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <RadioButton
            android:id="@+id/radio_02"
            android:padding="10dp"
            android:button="@null"
            android:gravity="center"
            android:background="@drawable/radio_selector"
            android:text="想法"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <RadioButton
            android:id="@+id/radio_03"
            android:padding="10dp"
            android:button="@null"
            android:gravity="center"
            android:background="@drawable/radio_selector"
            android:text="市场"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <RadioButton
            android:id="@+id/radio_04"
            android:padding="10dp"
            android:button="@null"
            android:gravity="center"
            android:background="@drawable/radio_selector"
            android:text="通知"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <RadioButton
            android:id="@+id/radio_05"
            android:padding="10dp"
            android:button="@null"
            android:gravity="center"
            android:background="@drawable/radio_selector"
            android:text="更多"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent" />

    </RadioGroup>
</RelativeLayout>
++++++++++++++++++++++++++++++++++++++++++++++++++++++

空白frment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:background="#888888"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</LinearLayout>

+++++++++++++++++++++++++++++++++++++++++++++++++++++

首页frment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:padding="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="羞羞的铁拳"
        />

    <android.support.design.widget.TabLayout
        android:id="@+id/tab"
        app:tabGravity="center"
        app:tabIndicatorColor="@color/colorAccent"
        app:tabMode="scrollable"
        app:tabSelectedTextColor="@color/colorPrimaryDark"
        app:tabTextColor="@color/colorPrimary"
        android:layout_width="match_parent"
        android:layout_height="40dp">

    </android.support.design.widget.TabLayout>

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

    </android.support.v4.view.ViewPager>

</LinearLayout>

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

热门frment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <news1510a.bawei.com.a14_zhoukao_test.view.XListView
        android:id="@+id/x_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </news1510a.bawei.com.a14_zhoukao_test.view.XListView>

</LinearLayout>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

子界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <news1510a.bawei.com.a14_zhoukao_test.view.XListView
        android:id="@+id/x_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </news1510a.bawei.com.a14_zhoukao_test.view.XListView>

</LinearLayout>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

子界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:padding="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/text_title"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="100dp"
        android:layout_height="100dp" />

</LinearLayout>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

radio_selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!--根据选中和未选中的状态,去设置背景颜色的图片-->
    <item android:state_checked="true" android:drawable="@color/colorAccent"/>
    <item android:state_checked="false" android:drawable="@color/colorPrimary"/>
    <item android:drawable="@color/colorPrimary"/>

</selector>

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.adapter;

import android.content.Context;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

import news1510a.bawei.com.a14_zhoukao_test.R;
import news1510a.bawei.com.a14_zhoukao_test.bean.DataDataBean;
import news1510a.bawei.com.a14_zhoukao_test.util.ImageLoaderUtil;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public class MyAdapter extends BaseAdapter {
    Context context;
    List<DataDataBean.ResultsBean> list;
    private int TEXT_ONLY = 0;
    private int IMAGE_TEXT = 1;

    public MyAdapter(Context context, List<DataDataBean.ResultsBean> list) {
        this.context = context;
        this.list = list;
    }

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

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getItemViewType(int position) {
        if (list.get(position).getImages() != null){
            return IMAGE_TEXT;
        }

        return TEXT_ONLY;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if (getItemViewType(i) == TEXT_ONLY){
            TextHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_text_layout,null);
                holder = new TextHolder();

                holder.textView = view.findViewById(R.id.text_title);

                view.setTag(holder);

            }else {
                holder = (TextHolder) view.getTag();
            }

            holder.textView.setText(list.get(i).getDesc());

        }else if (getItemViewType(i)==IMAGE_TEXT){

            ImageHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_iamge_layout,null);
                holder = new ImageHolder();

                holder.textView = view.findViewById(R.id.text_title);
                holder.imageView = view.findViewById(R.id.image_view);

                view.setTag(holder);

            }else {
                holder = (ImageHolder) view.getTag();
            }

            holder.textView.setText(list.get(i).getDesc());
            //图片
            Log.i("----",list.get(i).getImages().get(0)+"?imageView2/0/w/100");
            ImageLoader.getInstance().displayImage(list.get(i).getImages().get(0)+"?imageView2/0/w/100",holder.imageView, ImageLoaderUtil.getRoundOption());
        }

        return view;
    }

    private class TextHolder{
        TextView textView;
    }

    private class ImageHolder{
        TextView textView;
        ImageView imageView;
    }
}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.application;

import android.app.Application;

import news1510a.bawei.com.a14_zhoukao_test.util.ImageLoaderUtil;


/**
 * @author Dash
 * @date 2017/10/10
 * @description:
 */
public class BaseApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        //在应用创建的时候,,,对imageLoader进行全局配置
        ImageLoaderUtil.init(this);//写一个工具类对imageLoader进行初始化...应用也可以作为上下文
    }
}

+++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.inter;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public interface JsonStringCallaBack {
    public void getJsonString(String json);
}

+++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.util;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.Environment;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.display.CircleBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;

import java.io.File;

import news1510a.bawei.com.a14_zhoukao_test.R;


/**
 * @author Dash
 * @date 2017/10/10
 * @description:
 */
public class ImageLoaderUtil {

    /**
     * 对imageLoader进行配置的方法
     * @param context 上下文
     */
    public static void init(Context context) {

        //File cacheDir = StorageUtils.getCacheDirectory(context);  //指定默认的硬盘(sd卡)的缓存文件夹路径

        /**
         * 可以自己创建一个sd下面的文件夹作为硬盘缓存的路径
         */
        File file = new File(Environment.getExternalStorageDirectory(),"image");
        if (! file.exists()){
            file.mkdirs();
        }

        //1.创建一个ImageLoaderConfiguration,,,图片加载器的配置对象
        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context)

                .threadPoolSize(3) // default  线程池内加载的数量
                .threadPriority(Thread.NORM_PRIORITY - 2) // default 设置当前线程的优先级
                .tasksProcessingOrder(QueueProcessingType.FIFO) // default
                .denyCacheImageMultipleSizesInMemory()

                //1 TB = 1024GB 1G=1024MB 1M = 1024KB 1KB = 1024BYTE
                //LruMemoryCache,,lru最近最少使用算法...内部维护的是LinkedHashMap,,当一张图片最近很少使用的时候会从mao集合里面移除
                .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //指定内存缓存的大小,,2M,,可以通过自己的内存缓存实现
                .memoryCacheSize(2 * 1024 * 1024)  // 内存缓存的最大值
                .memoryCacheSizePercentage(13) // default

                //指定硬盘/磁盘缓存的路径
                .diskCache(new UnlimitedDiskCache(file)) // default 可以自定义缓存路径
                .diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)缓存的最大值
                .diskCacheFileCount(100)  // 可以缓存的文件数量


                .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
                .writeDebugLogs() // 打印debug log
                .build(); //开始构建

        //2.对上面配置对象的初始化
        ImageLoader.getInstance().init(config);

    }

    /**
     * 默认的展示图片的选项
     *
     * @return
     */
    public static DisplayImageOptions getDefaultOption() {
        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.ic_launcher) // 设置图片下载期间显示的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher) // 设置图片Uri为空或是错误的时候显示的图片
                .showImageOnFail(R.mipmap.ic_launcher) // 设置图片加载或解码过程中发生错误显示的图片

                .resetViewBeforeLoading(true)  // default 设置图片在加载前是否重置、复位

                .cacheInMemory(true) // default  设置下载的图片是否缓存在内存中
                .cacheOnDisk(true) // default  设置下载的图片是否缓存在SD卡中

                .considerExifParams(true) // default


                .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) // default 设置图片以如何的编码方式显示
                .bitmapConfig(Bitmap.Config.RGB_565) // default 设置图片的解码类型

                .displayer(new SimpleBitmapDisplayer()) // default  还可以设置圆角图片new RoundedBitmapDisplayer(20)

                .build();

        return options;
    }

    /**
     * 展示圆角的选项
     * @return
     */
    public static DisplayImageOptions getRoundOption() {
        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.ic_launcher) // 设置图片下载期间显示的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher) // 设置图片Uri为空或是错误的时候显示的图片
                .showImageOnFail(R.mipmap.ic_launcher) // 设置图片加载或解码过程中发生错误显示的图片

                .resetViewBeforeLoading(true)  // default 设置图片在加载前是否重置、复位

                .cacheInMemory(true) // default  设置下载的图片是否缓存在内存中
                .cacheOnDisk(true) // default  设置下载的图片是否缓存在SD卡中

                .considerExifParams(true) // default


                .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) // default 设置图片以如何的编码方式显示
                .bitmapConfig(Bitmap.Config.RGB_565) // default 设置图片的解码类型

                .displayer(new RoundedBitmapDisplayer(20)) // default  还可以设置圆角图片new RoundedBitmapDisplayer(20)

                .build();

        return options;
    }

    /**
     * 展示圆形的选项
     * @return
     */
    public static DisplayImageOptions getCircleOption() {
        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.ic_launcher) // 设置图片下载期间显示的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher) // 设置图片Uri为空或是错误的时候显示的图片
                .showImageOnFail(R.mipmap.ic_launcher) // 设置图片加载或解码过程中发生错误显示的图片

                .resetViewBeforeLoading(true)  // default 设置图片在加载前是否重置、复位

                .cacheInMemory(true) // default  设置下载的图片是否缓存在内存中
                .cacheOnDisk(true) // default  设置下载的图片是否缓存在SD卡中

                .considerExifParams(true) // default


                .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) // default 设置图片以如何的编码方式显示
                .bitmapConfig(Bitmap.Config.RGB_565) // default 设置图片的解码类型

                .displayer(new CircleBitmapDisplayer()) // default  还可以设置圆角图片new RoundedBitmapDisplayer(20)

                .build();

        return options;
    }
}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.util;

import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import news1510a.bawei.com.a14_zhoukao_test.inter.JsonStringCallaBack;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public class NetDataUtil {

    /**
     * 获取数据之前先判断网络状态
     * @param path
     * @param callaBack
     */
    public static void getData(Context context,final String path, final JsonStringCallaBack callaBack) {
        if (NetWorkUtil.isConn(context)){
            Toast.makeText(context,"网络可用",Toast.LENGTH_SHORT).show();

            AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {
                @Override
                protected String doInBackground(Void... voids) {
                    try {
                        URL url = new URL(path);

                        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                        connection.setRequestMethod("GET");
                        connection.setReadTimeout(5000);
                        connection.setConnectTimeout(5000);

                        int responseCode = connection.getResponseCode();
                        if (responseCode == 200){
                            InputStream inputStream = connection.getInputStream();

                            String json = streamToString(inputStream,"utf-8");

                            return json;
                        }

                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    return null;
                }

                @Override
                protected void onPostExecute(String json) {
                    //异步拿回这个json串,交给具体解析的那个类
                    callaBack.getJsonString(json);
                }
            };

            asyncTask.execute();
        }else {
            NetWorkUtil.showNoNetWorkDlg(context);
        }


    }


    private static String streamToString(InputStream inputStream, String charset) {
        try {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String s = null;
            StringBuilder builder = new StringBuilder();
            while ((s = bufferedReader.readLine()) != null){
                builder.append(s);
            }

            bufferedReader.close();
            return builder.toString();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return  null;
    }
}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.util;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import news1510a.bawei.com.a14_zhoukao_test.R;


/**
 * @author Dash
 * @date 2017/9/27
 * @description:
 *
 * 如果要使用网络状态的判断,需要权限....<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 */
public class NetWorkUtil {

    /**
     * 这个方法是判断网络状态是否可用的
     * @param context
     * @return
     */
    public static boolean isConn(Context context){
        boolean bisConnFlag=false;
        //1.获取网络连接的管理对象
        ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //2.通过管理者对象拿到网络的信息
        NetworkInfo network = conManager.getActiveNetworkInfo();
        if(network!=null){
            //3.网络状态是否可用的返回值
            bisConnFlag=network.isAvailable();
        }
        return bisConnFlag;
    }

    /**
     * 如果没有网络 弹出dialog对话框,,,是否进入设置网络的页面
     * @param context
     */
    public static void showNoNetWorkDlg(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setIcon(R.mipmap.ic_launcher)         //
                .setTitle("警告")            //
                .setMessage("当前无网络,是否去设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // 跳转到系统的网络设置界面
                Intent intent = null;
                // 先判断当前系统版本
                if(android.os.Build.VERSION.SDK_INT > 10){  // 3.0以上
                    intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
                }else{
                    intent = new Intent();
                    intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
                }
                context.startActivity(intent);

            }
        }).setNegativeButton("取消", null).show();
    }
}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.fragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import news1510a.bawei.com.a14_zhoukao_test.R;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public class FragmentDongTai extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_dongtai_layout,container,false);

        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
}

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.fragment;

import android.os.Bundle;
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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

import news1510a.bawei.com.a14_zhoukao_test.R;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public class FragmentHome extends Fragment {

    private TabLayout tabLayout;
    private ViewPager viewPager;
    private List<String> list;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home_layout,container,false);

        tabLayout = view.findViewById(R.id.tab);
        viewPager = view.findViewById(R.id.view_pager);

        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        list = new ArrayList<>();
        list.add("动态");
        list.add("热门");
        list.add("发现");


        //设置适配器
        viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
            @Override
            public CharSequence getPageTitle(int position) {
                return list.get(position);
            }

            @Override
            public Fragment getItem(int position) {
                Fragment fragment =null;

                switch (position){
                    case 0:
                        fragment = new FragmentDongTai();
                        break;
                    case 1:
                        fragment = new FragmentReMen();
                        break;
                    case 2:
                        fragment = new FragmentFaXian();
                        break;

                    default:
                        break;
                }

                return fragment;
            }

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

        //关联
        tabLayout.setupWithViewPager(viewPager);
    }
}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++

package news1510a.bawei.com.a14_zhoukao_test.fragment;

import android.os.Bundle;
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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

import news1510a.bawei.com.a14_zhoukao_test.R;

/**
 * @author Dash
 * @date 2017/10/16
 * @description:
 */
public class FragmentHome extends Fragment {

    private TabLayout tabLayout;
    private ViewPager viewPager;
    private List<String> list;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home_layout,container,false);

        tabLayout = view.findViewById(R.id.tab);
        viewPager = view.findViewById(R.id.view_pager);

        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        list = new ArrayList<>();
        list.add("动态");
        list.add("热门");
        list.add("发现");


        //设置适配器
        viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
            @Override
            public CharSequence getPageTitle(int position) {
                return list.get(position);
            }

            @Override
            public Fragment getItem(int position) {
                Fragment fragment =null;

                switch (position){
                    case 0:
                        fragment = new FragmentDongTai();
                        break;
                    case 1:
                        fragment = new FragmentReMen();
                        break;
                    case 2:
                        fragment = new FragmentFaXian();
                        break;

                    default:
                        break;
                }

                return fragment;
            }

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

        //关联
        tabLayout.setupWithViewPager(viewPager);
    }
}

+++++++++++++++++++++++++++++++++++++++++++++++