MVP+RecylerView显示数据

最新推荐文章于 2022-09-05 10:03:32 发布

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本教程通过实例演示如何在Android应用中使用RecyclerView展示新闻列表，并利用OkHttp进行网络数据请求。

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.myapplication.MainActivity">

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

</RelativeLayout>

//item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:id="@+id/title"
        android:text="chnvbjdshv"/>
    <ImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/image"
        android:src="@drawable/ic_launcher_background"/>
</LinearLayout>

//bean

package com.example.myapplication;

import java.util.List;

/**
 * Created by Administrator on 2017/12/7.
 */

public class Bean {
    /**
     * code : 200
     * msg : success
     * newslist : [{"ctime":"2016-12-04 13:00","title":"格林：理解科尔吸食大麻 不过我从没吸过","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161204/1-161204120131.jpg","url":"http://www.51tyw.com/nba/2421.html"},{"ctime":"2016-12-04 00:00","title":"三分纪录延续！火箭队连续19场比赛命中10+三分球","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203233J3.jpg","url":"http://www.51tyw.com/nba/2417.html"},{"ctime":"2016-12-04 00:00","title":"詹姆斯谈三连败：是时候紧起来了 必须打得男人点","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203234010.jpg","url":"http://www.51tyw.com/nba/2418.html"},{"ctime":"2016-12-03 12:00","title":"骑士输赢都靠三分？那还要詹姆斯做什么？","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203104344.jpg","url":"http://www.51tyw.com/nba/2407.html"},{"ctime":"2016-12-03 00:00","title":"公牛vs骑士直播看点：詹伟兄弟对决","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202221205.jpg","url":"http://www.51tyw.com/nba/2395.html"},{"ctime":"2016-12-02 22:00","title":"火箭和勇士联手创NBA三分纪录","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202214212.jpg","url":"http://www.51tyw.com/nba/2392.html"},{"ctime":"2016-12-02 22:00","title":"巴克利：勇士打得像女式篮球，太软了！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202215032.jpg","url":"http://www.51tyw.com/nba/2394.html"},{"ctime":"2016-12-02 20:00","title":"詹姆斯完成月最佳球员4连霸的壮举！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-1612021PI0.jpg","url":"http://www.51tyw.com/nba/2388.html"},{"ctime":"2016-12-01 00:00","title":"威少再下三双战书！詹皇会不会先认怂？","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161128/1-16112Q13251.jpg","url":"http://www.51tyw.com/nba/2374.html"},{"ctime":"2016-12-01 00:00","title":"骑士这样的防守想夺冠？也许卫冕只是空谈！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161130/1-161130222229.jpg","url":"http://www.51tyw.com/nba/2375.html"}]
     */

    private int code;
    private String msg;
    private List<NewslistBean> newslist;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<NewslistBean> getNewslist() {
        return newslist;
    }

    public void setNewslist(List<NewslistBean> newslist) {
        this.newslist = newslist;
    }

    public static class NewslistBean {
        /**
         * ctime : 2016-12-04 13:00
         * title : 格林：理解科尔吸食大麻 不过我从没吸过
         * description : NBA新闻
         * picUrl : http://www.51tyw.com/uploads/allimg/161204/1-161204120131.jpg
         * url : http://www.51tyw.com/nba/2421.html
         */

        private String ctime;
        private String title;
        private String description;
        private String picUrl;
        private String url;

        public String getCtime() {
            return ctime;
        }

        public void setCtime(String ctime) {
            this.ctime = ctime;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getDescription() {
            return description;
        }

        public void setDescription(String description) {
            this.description = description;
        }

        public String getPicUrl() {
            return picUrl;
        }

        public void setPicUrl(String picUrl) {
            this.picUrl = picUrl;
        }

        public String getUrl() {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }

        @Override
        public String toString() {
            return "NewslistBean{" +
                    "ctime='" + ctime + '\'' +
                    ", title='" + title + '\'' +
                    ", description='" + description + '\'' +
                    ", picUrl='" + picUrl + '\'' +
                    ", url='" + url + '\'' +
                    '}';
        }
    }
}

//IAppolication

package com.example.myapplication;

import android.app.Application;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

/**
 * Created by Administrator on 2017/12/7.
 */

public class IApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this).build();
        ImageLoader.getInstance().init(configuration);
    }
}

//MainActivity

package com.example.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.example.myapplication.presenter.MyPresenter;
import com.example.myapplication.view.IInterfaceListener;

public class MainActivity extends AppCompatActivity implements IInterfaceListener {

    private RecyclerView recyclerView;
    private MyPresenter presenter;
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.recycler);
        presenter = new MyPresenter(this);
        presenter.getData();
        LinearLayoutManager manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recyclerView.setLayoutManager(manager);
        adapter = new MyAdapter(this);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public void success( Bean bean) {
        adapter.add(bean);

    }

    @Override
    public void fail(Exception e) {

    }
}

//MyAdapter

package com.example.myapplication;

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.LinearLayout;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;

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

/**
 * Created by Administrator on 2017/12/7.
 */

class MyAdapter extends RecyclerView.Adapter<MyAdapter.IViewHolder> {
    Context  context;
    List<Bean.NewslistBean> list;
    public MyAdapter(Context  context) {
        this.context=context;
    }
    public void add(Bean bean) {
        if(list==null){
            list=new ArrayList<>();
        }
        list.addAll(bean.getNewslist());
        notifyDataSetChanged();
    }


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

    @Override
    public void onBindViewHolder(IViewHolder holder, int position) {
         holder.title.setText(list.get(position).getTitle());
        ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.iamge);
    }



    @Override
    public int getItemCount() {
        return list==null ? 0 :list.size();
    }


    public class IViewHolder extends RecyclerView.ViewHolder {

        private final TextView title;
        private final ImageView iamge;

        public IViewHolder(View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.title);
            iamge = itemView.findViewById(R.id.image);
        }
    }
}

//model MyModel

package com.example.myapplication.model;

import android.util.Log;

import com.example.myapplication.Bean;
import com.example.myapplication.okhttpp.AbstractUiCallBack;
import com.example.myapplication.okhttpp.OkhttpUtils;

/**
 * Created by Administrator on 2017/12/7.
 */

public class MyModel {
    public void getData(final MyModelCallBack callBack){
        OkhttpUtils.getInstance().asy(null,"http://api.tianapi.com/nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=10", new AbstractUiCallBack<Bean>() {


            @Override
            public void success(Bean bean) {
                    callBack.success(bean);
                Log.i("=============",bean.toString());
            }

            @Override
            public void failure(Exception e) {
                    callBack.fail(e);
                Log.i("=============",e+"");
            }
        });
    }

}

//model MyModelCallBack

package com.example.myapplication.model;

import com.example.myapplication.Bean;

/**
 * Created by Administrator on 2017/12/7.
 */
//http://api.tianapi.com/nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=10
public interface MyModelCallBack {
    public void success(Bean bean);
    public void fail(Exception e);
}

//okhttp AbstractUiCallBack

package com.example.myapplication.okhttpp;

import android.os.Handler;
import android.os.Looper;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
 * Created by muhanxi on 17/11/10.
 *
 *  * Okhttp 单例 范型的封装
 */

public  abstract  class AbstractUiCallBack<T> implements Callback {

    /**
     * 成功回调
     * @param t
     */
    public abstract void success(T t);

    /**
     * 失败回调
     * @param e
     */
    public abstract void failure(Exception e);


    private Handler handler = null ;
    private Class clazz ;

    public AbstractUiCallBack(){
        handler = new Handler(Looper.getMainLooper());


        //  得到的是一个 AbstractUiCallBack<T> 的Type
       Type type =  getClass().getGenericSuperclass() ;

        // 得到的是T的实际Type
       Type [] arr =  ((ParameterizedType)type).getActualTypeArguments() ;

        clazz = (Class) arr[0] ;



    }




    @Override
    public void onFailure(Call call, IOException e) {

        failure(e);

    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {


        try {
            String result = response.body().string();
            System.out.println("result = " + result);
            Gson gson = new Gson();

            final T t = (T) gson.fromJson(result,clazz);

            handler.post(new Runnable() {
                @Override
                public void run() {
                    success(t);
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
            failure(e);
        } catch (JsonSyntaxException e) {
            e.printStackTrace();
            failure(e);
        }


    }
}

// okhttp LoggingInterceptor

package com.example.myapplication.okhttpp;

import java.io.IOException;

import okhttp3.FormBody;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * 可以实现 添加公共请求参数
 */
public class LoggingInterceptor implements Interceptor {


  @Override public Response intercept(Chain chain) throws IOException {
    //首先取到Request
    Request request = chain.request();
    Response response = null;
    Request requestProcess = null ;
    if("GET".equals(request.method())){
      String url =  request.url().toString();
      Request.Builder builder =  request.newBuilder() ;
      builder.get().url(url);
      requestProcess =  builder.build();
      response = chain.proceed(requestProcess);
    } else {
      FormBody.Builder builder = new FormBody.Builder() ;
      RequestBody requestBody =  request.body() ;
      if(requestBody instanceof FormBody){
        FormBody formBody = (FormBody)requestBody ;
        for (int i=0;i<formBody.size();i++){
          builder.add(formBody.encodedName(i),formBody.encodedValue(i));
        }
        builder.add("source","android");
      }
       requestProcess =  request.newBuilder().url(request.url().toString()).post(builder.build()).build() ;
      response = chain.proceed(requestProcess);
    }




    return response;
  }
}

//okhttp OkhttpUtils

package com.example.myapplication.okhttpp;

import java.io.File;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;

/**
 * Created by muhanxi on 17/11/10.
 *
 *
 * Okhttp 单例 范型的封装
 */

public class OkhttpUtils {






    private static OkhttpUtils okhttpUtils = null ;

    private OkhttpUtils(){

    }

    public static OkhttpUtils getInstance(){

        if(okhttpUtils == null){
            okhttpUtils = new OkhttpUtils();
            client = new OkHttpClient.Builder()
                    .readTimeout(20, TimeUnit.SECONDS)
                    .writeTimeout(20,TimeUnit.SECONDS)
                    .connectTimeout(20,TimeUnit.SECONDS)
                    //添加拦截器
                    .addInterceptor(new LoggingInterceptor())
                    .build();
        }
        return okhttpUtils ;

    }


    private static OkHttpClient client ;


    /**
     * 发起异步请求
     * @param params
     * @param url
     * @param callBack
     */
    public void asy(Map<String,String> params,String url,AbstractUiCallBack callBack){
        Request request = null ;

        if(params != null){
            // post 请求
            FormBody.Builder builder = new FormBody.Builder() ;
            for(Map.Entry<String,String> entry : params.entrySet()){
                builder.add(entry.getKey(),entry.getValue());
            }
            FormBody body =  builder.build();
            request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
        } else {
            // get 请求
            request = new Request.Builder()
                    .url(url)
                    .build();
        }



        client.newCall(request).enqueue(callBack);

    }

    private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");


    public static void postFile(Map<String,String> map, String url, File file,AbstractUiCallBack callBack){

        String [] array =  file.getAbsolutePath().split("\\/");

        MultipartBody.Builder builder = new MultipartBody.Builder();
        builder.setType(MultipartBody.FORM);

        for(Map.Entry<String,String> entry : map.entrySet()){
            builder.addFormDataPart(entry.getKey(),entry.getValue());
        }
        builder.addFormDataPart("imageFileName",array[array.length-1]);


        if(file.exists() && file.length() > 0){
            builder.addFormDataPart("image",array[array.length-1], RequestBody.create(MEDIA_TYPE_PNG,file));
        }
        MultipartBody body =  builder.build() ;

        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        client.newCall(request).enqueue(callBack);


    }

}

//Presenter MyPresenter

package com.example.myapplication.presenter;

import android.view.View;

import com.example.myapplication.Bean;
import com.example.myapplication.model.MyModel;
import com.example.myapplication.model.MyModelCallBack;
import com.example.myapplication.view.IInterfaceListener;

/**
 * Created by Administrator on 2017/12/7.
 */

public class MyPresenter {
    MyModel model;
    IInterfaceListener listener;
    public  MyPresenter(IInterfaceListener listener){
        this.listener=listener;
        this.model=new MyModel();
    }
    public void  getData(){
        model.getData(new MyModelCallBack() {
            @Override
            public void success(Bean bean) {
                listener.success(bean);
            }

            @Override
            public void fail(Exception e) {
                  listener.fail(e);
            }
        });
    }

}

//view IInterfaceListener

package com.example.myapplication.view;

import com.example.myapplication.Bean;

/**
 * Created by Administrator on 2017/12/7.
 */

public interface IInterfaceListener {
    public void success(Bean bean);
    public void fail(Exception e);
}

//导依赖，联网 .name