OKhttp，MVP，RecyclerView，联合使用，点击条目进入详情页

最新推荐文章于 2018-11-14 21:29:56 发布

天生犯二

最新推荐文章于 2018-11-14 21:29:56 发布

阅读量629

点赞数

CC 4.0 BY-SA版权

分类专栏： android

本文链接：https://blog.youkuaiyun.com/qq_40040163/article/details/78740550

android 专栏收录该内容

10 篇文章

订阅专栏

这篇博客介绍了如何将OKhttp用于网络请求，结合MVP设计模式和RecyclerView，实现点击RecyclerView条目后跳转到详情页面。详细内容包括布局设计（MainActivity.xml, Main2Activity.xml, item.xml），权限处理，以及关键代码部分如IView接口，GsonUtils，Presenter，RecyclerViewAdapter的实现。" 84307421,7334945,Java自学指南：从入门到精通的学习路径,"['Java编程', 'Java技术', 'Java框架', 'Java书籍', 'Java视频']

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

布局

----------------------------------------------------------MainActivity.xml----------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context="bwie.com.rikao33.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

----------------------------------------------------Main2Activity.xml---------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context="bwie.com.rikao33.Main2Activity">

    <TextView
        android:id="@+id/main2_tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="界面二"/>



</LinearLayout>

-----------------------------------------------------item.xml------------------------------------------------------

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



    <ImageView
        android:id="@+id/img"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@mipmap/ic_launcher"
        />
    <LinearLayout
        android:id="@+id/ly"
        android:layout_toRightOf="@+id/img"
        android:layout_width="match_parent"
        android:layout_height="120dp"
        android:orientation="vertical">
        <TextView
            android:id="@+id/mytext"
            android:layout_width="match_parent"
            android:textColor="#000"
            android:layout_height="60dp"
            android:textSize="22sp"/>
        <TextView
            android:id="@+id/shijian"
            android:layout_width="match_parent"
            android:textColor="#000"
            android:layout_height="60dp"
            android:textSize="16sp"/>
    </LinearLayout>



</RelativeLayout>

------------------------------------------------------------------------------------------------------------------------------------

权限

<uses-permission android:name="android.permission.INTERNET"/>

-------------------------------------------------------------------------------------------------------------------------------

代码

-----------------------------------------------------------------IView-------------------------------------------------------------------------------------

public interface IView {
    void success(List<JavaBean.NewslistBean> news);
    void failed(Exception e);
}

-------------------------------------------------------------------CallBack --------------------------------------------------------------------------------

public interface CallBack {

    void onSuccess(Object o);
    void onFailed(Exception e);

}

----------------------------------------------OkhttpUtils -------------------------------------------------------------

package bwie.com.rikao33.okHttp;

import android.os.Handler;
import android.text.TextUtils;


import java.io.IOException;
import java.util.Map;


import bwie.com.rikao33.Utils.GsonUtils;
import okhttp3.Call;

import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;


/**
 * Created by 高俊生 on 2017/11/30.
 */

public class OkhttpUtils {
    //单例模式
    private static volatile OkhttpUtils instance;
    private Handler handler = new Handler();

    //???
    public OkhttpUtils() {

    }


    public static OkhttpUtils getInstance() {
        if (null == instance) {
            synchronized (OkhttpUtils.class) {
                if (instance == null) {
                    instance = new OkhttpUtils();
                }
            }
        }
        return instance;
    }

    //???
    public void get(String url, Map<String, String> map, final Class cls, final CallBack callBack) {
        //判断是否有路径，若没有，直接返回
        if (TextUtils.isEmpty(url)) {
            return;
        }

        StringBuffer sb = new StringBuffer();
        sb.append(url);
        //????
        if (url.contains("?")) {
            if (url.indexOf("?") == sb.length() - 1) {
            } else {
                sb.append("&");
            }
        } else {
            sb.append("?");
        }

        //???
        for (Map.Entry<String, String> entry : map.entrySet()) {
            sb.append(entry.getKey())
                    .append("=")
                    .append(entry.getValue())
                    .append("&");
        }

        if (sb.indexOf("&") != -1) {
            sb.deleteCharAt(sb.lastIndexOf("&"));
        }

        OkHttpClient client = new OkHttpClient.Builder().build();
        final Request request = new Request.Builder()
                .get()
                .url(sb.toString())
                .build();

        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        callBack.onFailed(e);
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String ss = response.body().string();
                final Object o = GsonUtils.getInstance().fromJson(ss, cls);
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        callBack.onSuccess(o);
                    }
                });

            }
        });
    }
}

---------------------------------------------GsonUtils -----------------------------

package bwie.com.rikao33.Utils;

import com.google.gson.Gson;

/**
 * Created by 高俊生 on 2017/11/30.
 */

public class GsonUtils {

    private static Gson instance;
    public GsonUtils(){}

    public static Gson getInstance(){
        if (instance==null){
            instance = new Gson();
        }
        return instance;
    }


}

---------------------------------------------------------------Presenter ------------------------------------------------------------

package bwie.com.rikao33.presaenter;

import java.util.HashMap;

import bwie.com.rikao33.View.IView;
import bwie.com.rikao33.bean.JavaBean;
import bwie.com.rikao33.okHttp.CallBack;
import bwie.com.rikao33.okHttp.OkhttpUtils;

/**
 * Created by 高俊生 on 2017/11/30.
 */

public class Presenter {
    //接续数据，获取网络数据

    private IView iv;

    //???
    public void attachView(IView iv){
        this.iv = iv;
    }

   public void getnews(){
       HashMap<String ,String > map = new HashMap<String, String>();
       map.put("key","4a82473783694ddebd495d47b16c906e");
       map.put("num","10");
       OkhttpUtils.getInstance().get("http://api.tianapi.com/meinv/", map, JavaBean.class, new CallBack() {
           @Override
           public void onSuccess(Object o) {
              JavaBean o1= (JavaBean)o;
               iv.success(o1.getNewslist());
           }

           @Override
           public void onFailed(Exception e) {
                iv.failed(e);
           }
       });





   }

}

---------------------------------------------------------RecyclerviewAdpader ----------------------------------------------------------

package bwie.com.rikao33;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.List;

import bwie.com.rikao33.bean.JavaBean;

/**
 * Created by 高俊生 on 2017/11/30.
 */

public class RecyclerviewAdpader extends RecyclerView.Adapter<RecyclerviewAdpader.Viewholder> {

    private Context context;
    private List<JavaBean.NewslistBean> list;

    //自定义接口对象，点击事件
    private OnRecyclerViewItemClickLintemet listener;

    //自定义一个接口点击事件
    public interface OnRecyclerViewItemClickLintemet {
        void onItemClick(int position);
    }

    //定义接口方法         点击事件
    public void setOnRecyclerViewItemClickLintemet(OnRecyclerViewItemClickLintemet listener) {
        this.listener = listener;
    }


    //有参构造器
    public RecyclerviewAdpader(Context context, List<JavaBean.NewslistBean> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public Viewholder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(context, R.layout.item, null);
        Viewholder holder = new Viewholder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(Viewholder holder, final int position) {
        Glide.with(context).load(list.get(position).getPicUrl()).into(holder.img);
        holder.mytext.setText(list.get(position).getTitle());
        holder.shijian.setText(list.get(position).getCtime());

        //条目单击事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onItemClick(position);
            }
        });
    }


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

    public class Viewholder extends RecyclerView.ViewHolder {
        private final ImageView img;
        private final TextView mytext;
        private final TextView shijian;


        public Viewholder(View view) {
            super(view);
            img = (ImageView) itemView.findViewById(R.id.img);
            mytext = (TextView) itemView.findViewById(R.id.mytext);
            shijian = (TextView) itemView.findViewById(R.id.shijian);
        }
    }
}

--------------------------------------------------MainActivity --------------------------------------------

package bwie.com.rikao33;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import org.greenrobot.eventbus.EventBus;

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

import bwie.com.rikao33.View.IView;
import bwie.com.rikao33.bean.JavaBean;
import bwie.com.rikao33.presaenter.Presenter;

public class MainActivity extends AppCompatActivity implements IView {

    private RecyclerView rv;
    private List<JavaBean.NewslistBean> list = new ArrayList<JavaBean.NewslistBean>();
    private RecyclerviewAdpader recyclerviewAdpader;

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

        rv = (RecyclerView) findViewById(R.id.recyclerView);
        huoqu();

        recyclerviewAdpader = new RecyclerviewAdpader(this, list);
        LinearLayoutManager manager = new LinearLayoutManager(this);

        rv.setLayoutManager(manager);
        //设置适配器
        rv.setAdapter(recyclerviewAdpader);

        recyclerviewAdpader.setOnRecyclerViewItemClickLintemet(new RecyclerviewAdpader.OnRecyclerViewItemClickLintemet() {
            @Override
            public void onItemClick(final int position) {
                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                startActivity(intent);

                //???,粘性事件，
                EventBus.getDefault().postSticky(list.get(position).getTitle());
            }
        });
    }

    //获取Presenter获取网页的数据
    private void huoqu() {
        Presenter presaenter = new Presenter();
        presaenter.attachView(this);
        presaenter.getnews();
    }

    @Override
    public void success(List<JavaBean.NewslistBean> news) {
        if (news != null) {
            list.addAll(news);
            recyclerviewAdpader.notifyDataSetChanged();
        }
    }

    @Override
    public void failed(Exception e) {
        Log.d("错误：", e.getMessage());
    }
}

----------------------------------------------------------Main2Activity -----------------------------------------------------------

package bwie.com.rikao33;

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

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class Main2Activity extends AppCompatActivity {

    private TextView ss;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        ss = (TextView)findViewById(R.id.main2_tv);
    }

    @Override
    protected void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);

    }

    @Subscribe(threadMode = ThreadMode.MAIN,sticky = true)
    public void onMessageEvent(String event) {
        ss.setText(event);

    };


    @Override
    protected void onPause() {
        super.onPause();
        finish();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }
}