Android——MVP架构OkHttp的二次封装以及RecyclerView的使用

╰+哭是因爲堅強的太久メ 2022-06-06 13:48 314阅读 0赞

**MVP框架：**

MVP架构是当前比较成熟的Android架构，还有其他架构比如最初始的MVC和MVVM。

MVC相对于较为落后，MVVM使用DataBind，普及性不如MVP。所以最终决定自己设计的框架

是基于MVP思想进行总结的框架。

选择MVP框架的原因之一也是google官方的示例中MVP sample已经是完成，证明google官方对于MVP的承认度。

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**MainActivity.java**

package com.bawei.com.myapplication;
    
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.widget.Toast;
    
    import com.bawei.com.myapplication.adapter.NewsListAdapter;
    import com.bawei.com.myapplication.bean.Bean;
    import com.bawei.com.myapplication.callback.INewsView;
    import com.bawei.com.myapplication.presaenter.NewsPresenter;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity implements INewsView{
    
        private RecyclerView re_view;
        private List<Bean.DataBean> list;
        private NewsPresenter presenter;
    
        private NewsListAdapter adapter;
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            re_view = (RecyclerView) findViewById(R.id.re_view);
            list = new ArrayList<>();
            adapter = new NewsListAdapter(this, list);
    
    
            LinearLayoutManager manager = new LinearLayoutManager(this);
            re_view.setLayoutManager(manager);
            re_view.setAdapter(adapter);
    
            presenter = new NewsPresenter();
            presenter.attachView(this);
            presenter.getNews();
            adapter.setOnItemClickListener(new NewsListAdapter.OnItemClickListener() {
                @Override public void onClick(int position) {
                    Toast.makeText(MainActivity.this,"您点击了"+position+"行",Toast.LENGTH_SHORT).show();
                }
    
                @Override public void onLongClick(int position) {
                    Toast.makeText(MainActivity.this,"您长按点击了"+position+"行",Toast.LENGTH_SHORT).show();
                }
            });
    
        }
    
        @Override public void success(String tag, List<Bean.DataBean> 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();
            }
        }
    }

**HttpUtils**

package com.bawei.com.myapplication.http;
    
    import android.os.Handler;
    import android.text.TextUtils;
    import android.util.Log;
    
    import com.bawei.com.myapplication.callback.CallBack;
    import com.bawei.com.myapplication.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;
     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 (null == instance) {
                synchronized (HttpUtils.class) {
                    if (instance == null) {
                        instance = new HttpUtils();
                    }
                }
            }
            return instance;
        }
    
    
        /** * Get请求 * * @param url * @param map * @param callBack * @param cls * @param tag */ 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 sb = new StringBuffer();
            sb.append(url);
    
            // 如果包含？说明是2.3类型 if (url.contains("?")) {
                // 如果包含？并且？是最后一位，对应是2类型 if (url.indexOf("?") == url.length() - 1) {
    
                } else {
                    // 如果包含？并且？不是最后一位，对应是3类型 sb.append("&");
                }
            } else {
                // 不包含？，对应的1类型 sb.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()) {
                sb.append(entry.getKey())
                        .append("=")
                        .append(entry.getValue())
                        .append("&");
            }
    
            // 如果存在&号，把最后一个&去掉 if (sb.indexOf("&") != -1) {
                sb.deleteCharAt(sb.lastIndexOf("&"));
            }
    
            Log.i(TAG, "get url: " + sb);
    
            OkHttpClient client = new OkHttpClient();
    
            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() {
                            // 通过自己传进来的回调接口对象回传回去 callBack.onFailed(tag, e);
                        }
                    });
                }
    
                @Override public void onResponse(Call call, Response response) throws IOException {
                    final String result = response.body().string();
                    // 请求成功之后做解析，通过自己的回调接口将数据返回回去 handler.post(new Runnable() {
                        @Override public void run() {
                            Object o;
                            if (TextUtils.isEmpty(result)) {
                                o = null;
                            } else {
                                o = GsonUtils.getInstance().fromJson(result, cls);
                            }
                            callBack.onSuccess(tag, o);
                        }
                    });
                }
            });
        }

/** * 封装的post请求 * * @param url * @param map * @param callback * @param cls */ public void post(String url, Map<String, String> map, final Callback callback, final Class cls) {
        OkHttpClient client = new OkHttpClient();
    
        FormBody.Builder builder = new FormBody.Builder();
        for (Map.Entry<String, String> entry : map.entrySet()) {
            builder.add(entry.getKey(), entry.getValue());
        }
    
        FormBody body = builder.build();
    
        final Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
    
        Call call = client.newCall(request);
        call.enqueue(new okhttp3.Callback() {
            @Override public void onFailure(Call call, final IOException e) {
                Log.e(TAG, "onFailure: " + e.getCause().getStackTrace() + e.getMessage());
                handler.post(new Runnable() {
                    @Override public void run() {
                        callback.onFailed(e);
                    }
                });
    
            }
    
            @Override public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();
                Log.i(TAG, "onResponse: " + result);
    
                final Object o = GsonUtils.getInstance().fromJson(result, cls);
                handler.post(new Runnable() {
                    @Override public void run() {
                        callback.onSuccess(o);
                    }
                });
            }
        });
    }

}

**CallBack**

package com.bawei.com.myapplication.callback;
    
    /** * Created by Wangrx on 2017/11/10. */ public interface CallBack {
        void onSuccess(String tag,Object O);
        void onFailed(String tag, Exception e);
    
    }

**INewsView**

package com.bawei.com.myapplication.callback;
    
    
    import com.bawei.com.myapplication.bean.Bean;
    
    import java.util.List;
    
    
    public interface INewsView {
        void success(String tag, List<Bean.DataBean> news);
    
        void failed(String tag, Exception e);
    }

**NewsListAdapter**

package com.bawei.com.myapplication.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.bawei.com.myapplication.R;
    import com.bawei.com.myapplication.bean.Bean;
    import com.bumptech.glide.Glide;
    
    import java.util.List;
    
    
    public class NewsListAdapter extends RecyclerView.Adapter<NewsListAdapter.ViewHolder> {
        private Context context;
    
        private List<Bean.DataBean> list;
        private OnItemClickListener mOnItemClickListener;
    
        public interface OnItemClickListener{
            void onClick( int position);
            void onLongClick( int position);
        }
        public void setOnItemClickListener(OnItemClickListener onItemClickListener ){
            this. mOnItemClickListener=onItemClickListener;
        }
    
    
        public NewsListAdapter(Context context, List<Bean.DataBean> 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(final ViewHolder holder, final int position) {
            Glide.with(context).load(list.get(position).getIcon()).into(holder.imgLogo);
            holder.txtTitle.setText(list.get(position).getName());
            holder.txtTime.setText(list.get(position).getCreatetime());
            if( mOnItemClickListener!= null){
                holder.itemView.setOnClickListener( new View.OnClickListener() {
                    @Override public void onClick(View v) {
                        mOnItemClickListener.onClick(position);
                    }
                });
                holder. itemView.setOnLongClickListener( new View.OnLongClickListener() {
                    @Override public boolean onLongClick(View v) {
                        mOnItemClickListener.onLongClick(position);
                        return false;
                    }
                });
            }
    
        }
    
        @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 = (ImageView) itemView.findViewById(R.id.img_logo);
                txtTitle = (TextView) itemView.findViewById(R.id.txt_title);
                txtTime = (TextView) itemView.findViewById(R.id.txt_time);
    
            }
        }
    }

**NewsPresenter**

package com.bawei.com.myapplication.presaenter;
    
    
    import com.bawei.com.myapplication.bean.Bean;
    import com.bawei.com.myapplication.callback.CallBack;
    import com.bawei.com.myapplication.callback.INewsView;
    import com.bawei.com.myapplication.http.HttpUtils;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    
    public class NewsPresenter {
        private INewsView inv;
    
        public void attachView(INewsView inv) {
            this.inv = inv;
        }
    
        public void getNews() {
            //type=top&key=dbedecbcd1899c9785b95cc2d17131c5 Map<String, String> map = new HashMap<>();
    // map.put("cid", "1"); // map.put("key", "dbedecbcd1899c9785b95cc2d17131c5"); HttpUtils.getInstance().get("http://120.27.23.105/product/getCatagory", map, new CallBack() {
                @Override public void onSuccess(String tag, Object o) {
                    Bean bean = (Bean) o;
                    if (bean != null) {
                        List<Bean.DataBean> data = bean.getData();
                        inv.success(tag, data);
    
                    }
                }
    
                @Override public void onFailed(String tag, Exception e) {
                    inv.failed(tag, e);
                }
            }, Bean.class, "news");
        }
    
    
        public void detachView() {
            if (inv != null) {
                inv = null;
            }
    
        }
    }

**布局文件：**

**activity\_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.bawei.com.myapplication.MainActivity">
        <android.support.v7.widget.RecyclerView android:id="@+id/re_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>
    </RelativeLayout>

**item\_news.xml**

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    
        <ImageView android:id="@+id/img_logo"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_margin="10dp"
            android:scaleType="centerCrop" />
    
        <LinearLayout android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="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>

**权限：**

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

**依赖：**

compile 'com.squareup.okhttp3:okhttp:3.9.0'
    compile 'com.google.code.gson:gson:2.8.2'
    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'
    compile 'com.github.bumptech.glide:glide:3.7.0'

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