最厉害的代码

1.侧滑和切换

package com.example.administrator.mnykt;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RadioGroup;

import com.example.administrator.fragment.Frag1;
import com.example.administrator.fragment.Frag2;
import com.example.administrator.fragment.Frag3;
import com.example.administrator.fragment.Frag4;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private Frag1 frag1;
    private Frag2 frag2;
    private Frag3 frag3;
    private Frag4 frag4;
    private ArrayList<Fragment> list;

    private RadioGroup radio_group;
    private FrameLayout fram_layout;
    private FragmentManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final DrawerLayout d1 = (DrawerLayout) findViewById(R.id.d1);
        ImageView iv1 = (ImageView) findViewById(R.id.iv1);
        ImageView iv2 = (ImageView) findViewById(R.id.iv2);
        fram_layout = (FrameLayout) findViewById(R.id.fram_layout);
        radio_group = (RadioGroup) findViewById(R.id.radio_group);
        iv1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                d1.openDrawer(Gravity.LEFT);
            }
        });
        iv2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                d1.closeDrawer(Gravity.LEFT);
            }
        });

       final Frag1 frag1 = new Frag1();
        final Frag2 frag2 = new Frag2();
        final Frag3 frag3 = new Frag3();
        final Frag4 frag4 = new Frag4();

        manager = getSupportFragmentManager();
        manager.beginTransaction().replace(R.id.fram_layout,frag1).commit();

        radio_group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                FragmentTransaction transaction = manager.beginTransaction();
                switch (checkedId){
                    case R.id.rb1:
                        transaction.replace(R.id.fram_layout,frag1);
                        break;
                    case R.id.rb2:
                        transaction.replace(R.id.fram_layout,frag2);
                        break;
                    case R.id.rb3:
                        transaction.replace(R.id.fram_layout,frag3);
                        break;
                    case R.id.rb4:
                        transaction.replace(R.id.fram_layout,frag4);
                        break;
                }
                transaction.commit();
            }
        });
    }
}

2.布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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:id="@+id/d1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"

    >
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@color/colorPrimaryDark"

        >
        <ImageView
            android:id="@+id/iv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="主页面"
            android:layout_centerHorizontal="true"
            android:textSize="20sp"
            android:layout_marginTop="10dp"
            />
    </RelativeLayout>
    <FrameLayout
        android:id="@+id/fram_layout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="8"
        />
    <RadioGroup
        android:id="@+id/radio_group"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal"
        >
        <RadioButton
            android:id="@+id/rb1"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:text="首页"
            android:button="@null"
            android:textSize="20sp"
            />
        <RadioButton
            android:id="@+id/rb2"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:text="关注"
            android:button="@null"
            android:textSize="20sp"
            />
        <RadioButton
            android:id="@+id/rb3"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:text="推荐"
            android:button="@null"
            android:textSize="20sp"
            />
        <RadioButton
            android:id="@+id/rb4"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:text="娱乐"
            android:button="@null"
            android:textSize="20sp"
            />
    </RadioGroup>
</LinearLayout>

<LinearLayout
    android:layout_width="350dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="@color/colorPrimary"
    >
    <ImageView
        android:id="@+id/iv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"
        />
</LinearLayout>


</android.support.v4.widget.DrawerLayout>

3.fragment页面

package com.example.administrator.fragment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.Toast;

import com.example.administrator.adapter.Adapter;
import com.example.administrator.bean.NewsBean;
import com.example.administrator.helper.NewsDao;
import com.example.administrator.helper.User;
import com.example.administrator.mnykt.R;
import com.example.administrator.utils.HttpUtils;
import com.example.administrator.utils.NetUtils;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.util.ArrayList;
import java.util.HashSet;

public class Frag1 extends Fragment implements HttpUtils.Netcallback {

    private PullToRefreshListView pulltorefsh;
    private String url = "http://ttpc.dftoutiao.com/jsonpc/refresh?type=";
    //private String bannerUrl = "http://www.xieast.com/api/banner.php";
    private int type = 5010;
    private ArrayList<NewsBean.DataBean> list;
    private Adapter adapter;
    private NewsDao newsDao;
    private HttpUtils httpUtils;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = View.inflate(getContext(), R.layout.frag1, null);
         pulltorefsh = view.findViewById(R.id.pulltorefsh);
         pulltorefsh.setMode(PullToRefreshBase.Mode.BOTH);
         pulltorefsh.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
             @Override
             public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                 type=5010;
                 pulltorefsh.postDelayed(new Runnable() {
                     @Override
                     public void run() {
                         pulltorefsh.onRefreshComplete();
                     }
                 },2000);
                 getData();
             }

             @Override
             public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
               type++;
                 pulltorefsh.postDelayed(new Runnable() {
                     @Override
                     public void run() {
                         pulltorefsh.onRefreshComplete();
                     }
                 },2000);
               getData();
             }
         });
        //创建一个空的结合
        list = new ArrayList<>();
        //创建适配器
        adapter = new Adapter(getActivity(), list);
        pulltorefsh.setAdapter(adapter);
        //创建dao层
        newsDao = new NewsDao(getActivity());
        httpUtils = HttpUtils.getInstance();
        getData();

        //网络工具类
        return view;
    }



    private void getData() {
        User user = newsDao.query(url + type);
        if (user!=null){
            parserjson(user.json);
        }else{
           if (NetUtils.iswlzj(getActivity())){
               httpUtils.getwangluo(url+type,this);
           }else{
               Toast.makeText(getActivity(), "请连接网络", Toast.LENGTH_SHORT).show();
           }
        }
    }

    private void parserjson(String json) {
        Gson gson = new Gson();
        NewsBean newsBean = gson.fromJson(json, NewsBean.class);
        if (type==5010){
            list.clear();
        }
        list.addAll(newsBean.getData());
        HashSet hashSet = new HashSet(list);
        list.clear();
        list.addAll(hashSet);
        adapter.notifyDataSetChanged();
    }

    @Override
    public void onSuccess(String result) {
        Log.i("aaa","执行了success");
        //截取字段
        String json = result.replace("null(", "").replace(")", "");
       //把数据添加到数据库
        newsDao.insert(new User((url+type),json));
        Gson gson = new Gson();
        NewsBean newsBean = gson.fromJson(json, NewsBean.class);
        list.addAll(newsBean.getData());

    }

    @Override
    public void onError(String s) {
      Log.i("aaa",s);
    }

}

4.适配器

package com.example.administrator.adapter;

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

import com.example.administrator.bean.NewsBean;
import com.example.administrator.mnykt.R;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;

public class Adapter extends BaseAdapter {
    private Context context;
    private ArrayList<NewsBean.DataBean> list;

    public Adapter(Context context, ArrayList<NewsBean.DataBean> list) {
        this.context = context;
        this.list = list;
    }
    private final int TYPE_0=0;
    private final int TYPE_1=1;




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

    @Override
    public Object getItem(int position) {
        try {
            return list.get(position);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

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

    @Override
    public int getItemViewType(int position) {
        int p=position%2;
        if (p==0){
            return TYPE_0;
        }else{
            return TYPE_1;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int type = getItemViewType(position);
        if (type==0){
            ViewHolder holder=null;
            if (convertView==null){
                convertView = View.inflate(context, R.layout.item1, null);
                 holder = new ViewHolder();
                holder.text_view = (TextView)convertView.findViewById(R.id.text_view);
                holder.iv3 = (ImageView)convertView.findViewById(R.id.iv3);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();
            }
            holder.text_view.setText(list.get(position).getBrief());
            ImageLoader.getInstance().displayImage(list.get(position).getMiniimg().get(0).getSrc(),holder.iv3);
            return convertView;
        }else if (type==1){
            ViewHolder holder=null;
            if (convertView==null){
                convertView = View.inflate(context, R.layout.item2, null);
                holder = new ViewHolder();
                holder.text_view1 = (TextView)convertView.findViewById(R.id.text_view1);
                holder.iv4 = (ImageView)convertView.findViewById(R.id.iv4);
                holder.iv5 = (ImageView)convertView.findViewById(R.id.iv5);
                holder.iv6 = (ImageView)convertView.findViewById(R.id.iv6);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();
            }
            holder.text_view1.setText(list.get(position).getBrief());
            ImageLoader.getInstance().displayImage(list.get(position).getMiniimg().get(0).getSrc(),holder.iv4);
            ImageLoader.getInstance().displayImage(list.get(position).getMiniimg().get(0).getSrc(),holder.iv5);
            ImageLoader.getInstance().displayImage(list.get(position).getMiniimg().get(0).getSrc(),holder.iv6);
            return convertView;
        }
        return null;
    }
    public class ViewHolder{

        public TextView text_view;
        public ImageView iv3;
        public TextView text_view1;
        public ImageView iv4;
        public ImageView iv5;
        public ImageView iv6;
    }
}

最后

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