Xhttp——RecyclerView——MVP

xhttp请求数据

package com.bwei.recycler_xhttp.http;

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

import com.bwei.recycler_xhttp.callback.CallBack;
import com.bwei.recycler_xhttp.utils.GsonUtils;

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

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

/**
 * Created by MRli on 2017/11/9.
 */

public class HttpUtils {
    private static final String TAG = "HttpUtils";

    private static volatile HttpUtils instance;

    private static Handler handler = new Handler();

    private HttpUtils(){

    }

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

        return instance;
    }

    /**
     * Get请求
     *  @param url
     * @param map
     * @param callBack
     */
    public void get(String url, Map<String, String> map, final CallBack callBack, final Class cls,final String tag){
        // http://www.baoidu.com/login?mobile=11111&password=11111&age=1&name=zw

        // 1.http://www.baoidu.com/login                --------？ key=value&key=value
        // 2.http://www.baoidu.com/login?               --------- key=value&key=value
        // 3.http://www.baoidu.com/login?mobile=11111   -----&key=value&key=value

        if(TextUtils.isEmpty(url)){
            return;
        }

        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append(url);

        if(url.contains("?")){
            //如果包含？并且？不是最后一位，对应3
            if(url.indexOf("?")==url.length()-1){

            }else{
                stringBuffer.append("&");
            }

        }else{
            //不包含？对应1
            stringBuffer.append("?");
        }

        //遍历map集合进行拼接，拼接的形式是key=value&
        for(Map.Entry<String,String> entry:map.entrySet()){
            stringBuffer.append(entry.getKey())
                    .append("=")
                    .append(entry.getValue())
                    .append("&");

        }

        //如果存在&号，把最后一个&去掉
        if(stringBuffer.indexOf("&") != -1){
            stringBuffer.deleteCharAt(stringBuffer.lastIndexOf("&"));
        }

        //Log.i(TAG, "get url: " + stringBuffer);

        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .get()
                .url(stringBuffer.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(tag,e);
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                final String result = response.body().string();
                //Log.i(TAG, "onResponse: "+result);
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        Object o;
                        if(TextUtils.isEmpty(result)){
                            o = null;
                        }else{
                            o = GsonUtils.getInstance().fromJson(result,cls);

                            //Log.d(TAG, "ooo: "+o.toString());
                        }
                        callBack.onSuccess(tag,o);
                    }
                });
            }
        });

    }
}

CallBack回调接口

package com.bwei.recycler_xhttp.callback;

/**
 * Created by MRli on 2017/11/9.
 */

public interface CallBack {
    void onSuccess(String tag, Object o);

    void onFailed(String tag, Exception e);
}

INewsView回调接口

package com.bwei.recycler_xhttp.callback;

import com.bwei.recycler_xhttp.entity.NewsBean;

import java.util.List;

/**
 * Created by MRli on 2017/11/10.
 */

public interface INewsView {
    void success(String tag, List<NewsBean> news);
    void failed(String tag, Exception e);
}

列表显示RecyclerView.Adapter

package com.bwei.recycler_xhttp.adapter;

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 com.bwei.recycler_xhttp.R;
import com.bwei.recycler_xhttp.entity.NewsBean;

import java.util.List;

/**
 * Created by WuXirui
 * Create Time: 2017/11/9
 * Description:
 */

public class NewsListAdapter extends RecyclerView.Adapter<NewsListAdapter.ViewHolder> {
    private Context context;

    private List<NewsBean> list;

    public NewsListAdapter(Context context, List<NewsBean> list) {
        this.context = context;
        this.list = list;
    }

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

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Glide.with(context).load(list.get(position).getPicUrl()).into(holder.imgLogo);
        holder.txtTitle.setText(list.get(position).getTitle());
        holder.txtTime.setText(list.get(position).getDescription());
    }

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

    class ViewHolder extends RecyclerView.ViewHolder {
        private ImageView imgLogo;
        private TextView txtTitle;
        private TextView txtTime;

        public ViewHolder(View itemView) {
            super(itemView);
            imgLogo =  itemView.findViewById(R.id.img_logo);
            txtTitle = itemView.findViewById(R.id.txt_title);
            txtTime = itemView.findViewById(R.id.txt_time);
        }
    }
}

多条目展示的RecyclerView.Adapter

package com.bwei.recycler_xhttp.adapter;

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 com.bwei.recycler_xhttp.R;
import com.bwei.recycler_xhttp.entity.NewsBean;

import java.util.List;

/**
 * Created by MRli on 2017/11/11.
 */

public class NewsListAdapter2 extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    private Context context;
    private List<NewsBean> list;
    private static final String TAG = "NewsListAdapter2";
    private static final int TYPE_HAS_PIC = 0;
    private static final int TYPE_NO_PIC = 1;


    public NewsListAdapter2(Context context, List<NewsBean> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if(viewType == TYPE_HAS_PIC){
            View v =View.inflate(context,R.layout.item_news,null);
            ViewHolder holder = new ViewHolder(v);

            return holder;
        }else{
            View v2 =View.inflate(context,R.layout.item_news2,null);
            ViewHolderNoPic holder2 = new ViewHolderNoPic(v2);
            return holder2;
        }


    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if(holder instanceof ViewHolder){
            ViewHolder h1 = (ViewHolder) holder;
            Glide.with(context).load(list.get(position).getPicUrl()).into(h1.imgLogo);
            h1.txtTitle.setText(list.get(position).getTitle());
            h1.txtTime.setText(list.get(position).getDescription());
        }else if (holder instanceof ViewHolderNoPic){
            ViewHolderNoPic hn = (ViewHolderNoPic) holder;
            hn.txtTitle.setText(list.get(position).getTitle());
            hn.txtTime.setText(list.get(position).getCtime());
        }
    }

    @Override
    public int getItemViewType(int position) {
        if(position%2 == 0){
            return TYPE_HAS_PIC;
        }else{
            return TYPE_NO_PIC;
        }

    }

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

    class ViewHolderNoPic extends RecyclerView.ViewHolder{
        private TextView txtTitle;
        private TextView txtTime;
        public ViewHolderNoPic(View itemView) {
            super(itemView);
            txtTitle = itemView.findViewById(R.id.txt_title);
            txtTime = itemView.findViewById(R.id.txt_time);
        }
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        private ImageView imgLogo;
        private TextView txtTitle;
        private TextView txtTime;

        public ViewHolder(View itemView) {
            super(itemView);

            imgLogo = itemView.findViewById(R.id.img_logo);
            txtTitle = itemView.findViewById(R.id.txt_title);
            txtTime = itemView.findViewById(R.id.txt_time);
        }
    }

}

当然Gson解析的Bean是不可缺少的还需自定义NewBean类，以及MessageBean类

private String stat;
    private List<NewsBean> data;

    public String getStat() {
        return stat;
    }

    public void setStat(String stat) {
        this.stat = stat;
    }

    public List<NewsBean> getData() {
        return data;
    }

    public void setData(List<NewsBean> data) {
        this.data = data;
    }

presenter  V层与M层的连接

package com.bwei.recycler_xhttp.presaenter;

import com.bwei.recycler_xhttp.callback.CallBack;
import com.bwei.recycler_xhttp.callback.INewsView;
import com.bwei.recycler_xhttp.entity.MessageBean;
import com.bwei.recycler_xhttp.entity.NewsBean;
import com.bwei.recycler_xhttp.http.HttpUtils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by MRli on 2017/11/10.
 */

public class NewsPresenter {
    private static final String TAG = "NewsPresenter";
    private INewsView inv;

    public void attachView(INewsView inv) {
        this.inv = inv;
    }

    public void getNews(int page) {
        Map<String,String> map = new HashMap<>();
        map.put("key","8d6e3228d25298f13af4fc40ce6c9679");
        map.put("num","10");
        map.put("page", String.valueOf(page));
        HttpUtils.getInstance().get("https://api.tianapi.com/wxnew/?", map, new CallBack() {
            @Override
            public void onSuccess(String tag, Object o) {
                MessageBean bean = (MessageBean) o;
                if(bean !=null){
                    List<NewsBean> data = bean.getNewslist();
                    //Log.d(TAG, "data: " + data.get(3).getPicUrl().toString());
                    inv.success(tag,data);
                }
            }

            @Override
            public void onFailed(String tag, Exception e) {
                inv.failed(tag,e);

            }
        },MessageBean.class, "news");
    }
    public  void detachView(){
        if(inv != null){
            inv = null;
        }
    }
}

添加了刷新和加载的Main页面

package com.bwei.recycler_xhttp;

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

import com.bwei.recycler_xhttp.adapter.NewsListAdapter2;
import com.bwei.recycler_xhttp.callback.INewsView;
import com.bwei.recycler_xhttp.entity.NewsBean;
import com.bwei.recycler_xhttp.presaenter.NewsPresenter;
import com.jcodecraeer.xrecyclerview.ProgressStyle;
import com.jcodecraeer.xrecyclerview.XRecyclerView;

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

public class MainActivity extends AppCompatActivity implements INewsView {

    private XRecyclerView rvNews;

    private List<NewsBean> list;
    private NewsListAdapter2 adapter;
    private NewsPresenter presenter;

    private int page = 1;
    //是否刷新
    private boolean isFresh = true;

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

        initView();

        rvNews.setLoadingMoreEnabled(true);
        rvNews.setLoadingMoreProgressStyle(ProgressStyle.SquareSpin);

        rvNews.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                page = 1;
                isFresh = true;
                loadData();
            }

            @Override
            public void onLoadMore() {
                page++;
                isFresh = false;
                loadData();
            }
        });


        list = new ArrayList<>();

        adapter = new NewsListAdapter2(this, list);

        LinearLayoutManager manager = new LinearLayoutManager(this);

        rvNews.setLayoutManager(manager);
        rvNews.setAdapter(adapter);

        presenter = new NewsPresenter();
        presenter.attachView(this);

       // presenter.getNews();

        loadData();

    }

    private void loadData() {
        presenter.getNews(page);
    }

    private void initView() {

        rvNews = findViewById(R.id.rv_news);
    }

    @Override
    public void success(String tag, List<NewsBean> news) {
        if(isFresh){
            rvNews.refreshComplete();
        }else{
            rvNews.loadMoreComplete();
        }

        if(news != null){
            if(isFresh){
                list.clear();
            }
            list.addAll(news);
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void failed(String tag, Exception e) {

        Toast.makeText(this,e.getMessage(),Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(presenter!=null){
            presenter.detachView();
        }

    }
}

普通展示ListView的Main页面

package com.bwie.mvpokrecyclerview;

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

import com.bwie.mvpokrecyclerview.adapter.NewsListAdapter;
import com.bwie.mvpokrecyclerview.callback.INewsView;
import com.bwie.mvpokrecyclerview.entity.NewsBean;
import com.bwie.mvpokrecyclerview.presaenter.NewsPresenter;

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

public class MainActivity extends AppCompatActivity implements INewsView {
    private static final String TAG = "MainActivity";

    private RecyclerView rvNews;

    private NewsPresenter presenter;

    private NewsListAdapter adapter;

    private List<NewsBean> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rvNews = (RecyclerView) findViewById(R.id.rv_news);

        list = new ArrayList<>();
        adapter = new NewsListAdapter(this, list);

        LinearLayoutManager manager = new LinearLayoutManager(this);
        rvNews.setLayoutManager(manager);
        rvNews.setAdapter(adapter);

        presenter = new NewsPresenter();
        presenter.attachView(this);

        presenter.getNews();
    }

    @Override
    public void success(String tag, List<NewsBean> news) {
        if (null != news) {
            list.addAll(news);
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void failed(String tag, Exception e) {
        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (presenter != null) {
            presenter.detachView();
        }
    }
}

main_layout
<com.jcodecraeer.xrecyclerview.XRecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/rv_news">

    </com.jcodecraeer.xrecyclerview.XRecyclerView>

多条目加载的两个布局文件
new_item
<?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">

    <ImageView
        android:id="@+id/img_logo"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_margin="10dp"
        android:src="@mipmap/ic_launcher"
        android:scaleType="centerCrop" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:orientation="vertical"
        android:gravity="center_vertical">

        <TextView
            android:id="@+id/txt_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:singleLine="true"
            android:textColor="#232121"
            android:textSize="15sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/txt_time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="#635353"
            android:textSize="13sp" />
    </LinearLayout>
</LinearLayout>

news_item2
<?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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:orientation="vertical"
        android:gravity="center_vertical">

        <TextView
            android:id="@+id/txt_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:singleLine="true"
            android:textColor="#232121"
            android:textSize="15sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/txt_time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="#635353"
            android:textSize="13sp" />
    </LinearLayout>
</LinearLayout>

依赖导入
repositories {
    mavenCentral()
    maven { url 'https://maven.google.com' }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:recyclerview-v7:26.+'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.3.1'
    compile 'com.github.bumptech.glide:glide:4.3.1'
    testCompile 'junit:junit:4.12'
    compile 'com.jcodecraeer:xrecyclerview:1.3.2'
    compile 'com.squareup.okhttp3:okhttp:3.9.0'
    compile 'com.google.code.gson:gson:2.8.2'
}