Android MVP框架+RxJava+Retrofit+cecycleView,请求网络数据并加载

来源：互联网发布：数据库创建表指令编辑：程序博客网时间：2024/05/01 00:49

这些天经常用MVP框架来写工程，今天就给大家用MVP框架，RxJava+Retrofit请求网络数据，并recycleView加载，fresco图片加载。

首先加载所需要的权限：

// recycleViewcompile 'com.android.support:mediarouter-v7:25.0.0'compile 'com.android.support:appcompat-v7:25.0.0'compile 'com.android.support:recyclerview-v7:25.0.0'// reftorfitcompile 'com.android.support:design:23.4.0'compile 'com.squareup.retrofit2:retrofit:2.0.1'compile 'com.squareup.retrofit2:converter-gson:2.0.1'compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'compile 'io.reactivex:rxandroid:1.1.0'compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'// frescocompile 'com.facebook.fresco:fresco:0.11.0'

MVP框架，最主要的还是三个层，model层、view层、presenter层，

在View层里定义一个接口：Iview：里边就写一个方法，用来传递数据集合，主要在主函数中实现这个借口，重写里边的方法，用来给适配器中添加数据。

package view;import java.util.List;import bean.User;/** * Created by 笔片 on 2017/11/7. */public interface Iview {    void GetUser(List<User.SongListBean> list);}

同样，在model中定义一个接口Imodel：

package model;import java.util.List;import bean.User;/** * Created by 笔片 on 2017/11/7. */public interface Imodel {    void GetJson(String url);}

在请求网络数据之前，要先用RxJava来拼接接口的URL，新建一个Api.class,将请求的接口地址写到这个类里边，也比较省事，规范一点

Api.class:

package api;/** * Created by 笔片 on 2017/11/7. */public class Api {    public static final String URL_HOME = "http://tingapi.ting.baidu.com/v1/restserver/";}

,新建一个接口ApiService ：

package inter;import bean.User;import retrofit2.http.GET;import rx.Observable;/** * Created by 笔片 on 2017/11/7. */public interface ApiService {    @GET("ting?method=baidu.ting.billboard.billList&type=1&size=10&offset=0")    Observable<User> getNoParams();}

，在定义一个类ApiServices，来实现这个接口

package inter;import bean.User;import rx.Observable;/** * Created by 笔片 on 2017/11/7. */public class ApiServices implements ApiService {    @Override    public Observable<User> getNoParams() {        return null;    }}

新建一个usermodel.class，并在这个类中实现Imodel方法。这个方法中主要用来请求网络数据，添加Retrofit的拦截器，这其中的LoggingInterceptor 就是这个接口的拦截器，这个需要自己改一下，

package model;import java.util.List;import api.Api;import bean.User;import inter.ApiService;import okhttp3.OkHttpClient;import retrofit2.Retrofit;import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;import retrofit2.converter.gson.GsonConverterFactory;import rx.Observable;import rx.Observer;import rx.android.schedulers.AndroidSchedulers;import rx.schedulers.Schedulers;/** * 在usermodel 中请求网络数据，做耗时操作 * Created by 笔片 on 2017/11/7. */public class usermodel implements Imodel{    public OnFinishLisenter lisenter;    public void setLisenter(OnFinishLisenter lisenter) {        this.lisenter = lisenter;    }    /**     * 利用Retrofit请求网络数据，     * 加载拦截器：得到一个OKHttpClick对象，利用建造者模式加载拦截器，并且在创建retrofit时，添加上OkHttpClick对象     * @param list     */    LoggingInterceptor loggingInterceptor = new LoggingInterceptor();    @Override    public void GetJson(String url) {        // 添加一个拦截器        OkHttpClient okHttpClient = new OkHttpClient.Builder()                .addInterceptor(loggingInterceptor)                .build();        //  创建Retrofit        Retrofit retrofit = new Retrofit.Builder()                .baseUrl(url)                // 添加拦截器到Retrofit中                .client(okHttpClient)                .addConverterFactory(GsonConverterFactory.create())                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())                .build();        // 通过动态代理得到网络接口对象        ApiService apiservice = retrofit.create(ApiService.class);        Observable<User> user = apiservice.getNoParams();        user.subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Observer<User>() {                    @Override                    public void onCompleted() {                    }                    @Override                    public void onError(Throwable e) {                    }                    @Override                    public void onNext(User user) {                        List<User.SongListBean> song_list = user.getSong_list();                        lisenter.OnFinish(song_list);                    }                });    }}

通过usermodel请求下来的网络数据，由于M层和V层之间不能直接传递数据，所以，要将M层请求下来的数据通过接口回调的方法传递到P层，所以接下来要定义一个接口

OnFinishLisenter：

package model;import java.util.List;import bean.User;/** * Created by 笔片 on 2017/11/7. */public interface OnFinishLisenter {    void OnFinish(List<User.SongListBean> list);}

接下来，就写中间层presenter，用来获取来自model层传过来的数据，并且发送给View层，

userPresenter.class:

package presenter;import java.util.List;import bean.User;import model.OnFinishLisenter;import model.usermodel;import view.Iview;/** * Created by 笔片 on 2017/11/7. */public class userPresenter {    Iview iview;    usermodel usermodel;    public userPresenter(final Iview iview) {        this.iview = iview;        this.usermodel = new usermodel();        usermodel.setLisenter(new OnFinishLisenter() {            @Override            public void OnFinish(List<User.SongListBean> list) {                iview.GetUser(list);            }        });    }    public void GetUrl(String url){        usermodel.GetJson(url);    }}

由于要利用RecycleView来展示数据，来写适配器：

HomeAdapter.class:
package model;import android.content.Context;import android.net.Uri;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.bwie.test.mymvprxjavaretrofitrecycleview.R;import com.facebook.drawee.view.SimpleDraweeView;import java.util.List;import bean.User;/** * Created by 笔片 on 2017/11/7. */public class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder>{    List<User.SongListBean> mDatas;    Context context;    public HomeAdapter(List<User.SongListBean> mDatas, Context context) {        this.mDatas = mDatas;        this.context = context;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(                context).inflate(R.layout.list_item, parent, false));        return holder;    }    @Override    public int getItemCount() {        return mDatas.size();    }    class MyViewHolder extends RecyclerView.ViewHolder {        TextView tv;        SimpleDraweeView img;        public MyViewHolder(View view) {            super(view);            tv = (TextView) view.findViewById(R.id.tv);            img = (SimpleDraweeView) view.findViewById(R.id.img);        }    }    public interface OnItemClickLitener {        void onItemClick(View view, int position);        void onItemLongClick(View view, int position);    }    private OnItemClickLitener mOnItemClickLitener;    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) {        this.mOnItemClickLitener = mOnItemClickLitener;    }    @Override    public void onBindViewHolder(final MyViewHolder holder, final int position) {        holder.tv.setText(mDatas.get(position).getTitle());        String url = mDatas.get(position).getPic_small();        Uri uri = Uri.parse(url);        holder.img.setImageURI(uri);//        if (url.equals("") || url == null) {//            holder.img.setImageResource(R.mipmap.ic_launcher);//        } else {//            ImageLoader imgl = ImageLoader.getInstance();//            imgl.displayImage(url, holder.img);//        }        // 如果设置了回调，则设置点击事件        if (mOnItemClickLitener != null) {            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    int pos = holder.getLayoutPosition();                    mOnItemClickLitener.onItemClick(holder.itemView, pos);                }            });            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View v) {                    int pos = holder.getLayoutPosition();                    mOnItemClickLitener.onItemLongClick(holder.itemView, pos);                    return false;                }            });        }    }}
适配器中，加载图片的是用的fresco，要初始化，所以还是建了一个类，AppMy，用来初始化fresco
AppMy.class：
package app;import android.app.Application;import com.facebook.drawee.backends.pipeline.Fresco;/** * Created by 笔片 on 2017/11/7. */public class AppMy extends Application{    @Override    public void onCreate() {        Fresco.initialize(this);    }}



MainActivity.class:
package com.bwie.test.mymvprxjavaretrofitrecycleview;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import java.util.List;import api.Api;import bean.User;import model.HomeAdapter;import presenter.userPresenter;import view.Iview;public class MainActivity extends AppCompatActivity implements Iview{    userPresenter presenter;    RecyclerView recyclerView;    HomeAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        presenter = new userPresenter(this);        presenter.GetUrl(Api.URL_HOME);        recyclerView = (RecyclerView) findViewById(R.id.revyvleview);    }    // 得到presenter传过来的数据，添加到输配器中    @Override    public void GetUser(List<User.SongListBean> list) {        recyclerView.setLayoutManager(new LinearLayoutManager(this));        adapter = new HomeAdapter(list,MainActivity.this);        recyclerView.setAdapter(adapter);    }}
布局文件：
mainactivity.xml:
<?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:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.bwie.test.mymvprxjavaretrofitrecycleview.MainActivity">    <android.support.v7.widget.RecyclerView        android:id="@+id/revyvleview"        android:layout_width="match_parent"        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></RelativeLayout>

子布局：

list_item:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:fresco="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical">    <com.facebook.drawee.view.SimpleDraweeView        android:id="@+id/img"        android:layout_width="130dp"        android:layout_height="130dp"        fresco:placeholderImage="@mipmap/ic_launcher" />    <TextView        android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="33333333333333333" /></LinearLayout>

到这里就写完了，其中有不足的地方，还是要请多多指教。

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