Android——自定义拦截器实现OKHttp网络请求

痛定思痛。 2022-06-05 00:48 766阅读 0赞

**示例图：**

**![Center][]![Center 1][]**

**一、技术选型：**

1. 项目框架：MVP；注意：避免内存泄漏；

2. 图片加载： Universal-Image-Loader或Glide图片加载框架

3．网络加载框架：OkHttp

4. 自定义应用拦截器，封装公共请求参数（注意：必须通过拦截器封装公共请求参数，否则无法请求数据）

公共请求参数，在我们项目研发过程中，作用非常大。封装公共请求承参数之后，那么所有的接口都会默认携带这些公共参数，达到复用的效果。

公共请求参数：source=android

参数名称：source

参数值：android

类型：String

是否必传：是

5. 数据展示使用RecylerView；

**二、业务逻辑需求：**

1. 搜索框输入关键字（笔记本、手机），其他关键词没有数据，点击搜索实现如图效果；

2. 图1是列表布局，图2是网格布局；

3. 通过右上角按钮点击切换列表布局和网格布局，按钮随着切换；

4. 实现下拉刷新展示第一页数据、上拉加载更多实现分页功能。

**三、接口：**

[http://120.27.23.105/product/searchProducts][http_120.27.23.105_product_searchProducts]

keywords=笔记本&page=1

参数说明：

keywords 关键字字段 String类型 必传

page  页码数  String类型  必传

公共参数：source 来源字段 String类型 （通过自定义拦截器封装）

**MainActivity.java**

package com.bawei.com.wangruixin1509c20171113;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.os.Handler;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.GridLayoutManager;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.view.MotionEvent;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    
    import com.bawei.com.wangruixin1509c20171113.adapter.NewsListAdapter;
    import com.bawei.com.wangruixin1509c20171113.bean.JavaBean;
    import com.bawei.com.wangruixin1509c20171113.httputils.INewsView;
    import com.bawei.com.wangruixin1509c20171113.presenter.NewsPresenter;
    import com.jwenfeng.library.pulltorefresh.BaseRefreshListener;
    import com.jwenfeng.library.pulltorefresh.PullToRefreshLayout;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity implements INewsView{
    
        private RecyclerView re_view;
        private List<JavaBean.DataBean> list;
        private NewsListAdapter adapter;
        private Button btn_sousuo;
        private EditText et_sousuo;
        private NewsPresenter presenter;
        private ImageView right;
        private boolean flag = true;
        private PullToRefreshLayout mpull;
        private int page = 1;
        private String show;
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            re_view = (RecyclerView) findViewById(R.id.re_view);
            btn_sousuo = (Button) findViewById(R.id.btn_sousuo);
            et_sousuo = (EditText) findViewById(R.id.et_sousuo);
            right = (ImageView) findViewById(R.id.right);
            mpull = (PullToRefreshLayout) findViewById(R.id.mpull);
    
            list = new ArrayList<>();
            adapter = new NewsListAdapter(this, list,1);
            LinearLayoutManager manager = new LinearLayoutManager(this);
            re_view.setLayoutManager(manager);
            re_view.setAdapter(adapter);
            presenter = new NewsPresenter();
            presenter.attachView(this);
    
    
            btn_sousuo.setOnClickListener(new View.OnClickListener() {
    
                @Override public void onClick(View view) {
                    show = et_sousuo.getText().toString().trim();
                    presenter.getNews(show,page);
    
                }
            });
            right.setOnTouchListener(new View.OnTouchListener() {
                @Override public boolean onTouch(View view, MotionEvent motionEvent) {
                    if (flag){
                        adapter.notifyDataSetChanged();
                            adapter = new NewsListAdapter(MainActivity.this, list,2);
                            right.setImageDrawable(getResources().getDrawable(R.mipmap.lv_icon));
                            GridLayoutManager manager = new GridLayoutManager(MainActivity.this, 2);
                            re_view.setLayoutManager(manager);
                            re_view.setAdapter(adapter);
                            flag = false;
                    }else {
                        adapter.notifyDataSetChanged();
                        adapter = new NewsListAdapter(MainActivity.this, list,1);
                        right.setImageDrawable(getResources().getDrawable(R.mipmap.grid_icon));
                        LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
                        re_view.setLayoutManager(manager);
                        re_view.setAdapter(adapter);
                        flag = true;
                    }
                    return false;
                }
            });
            mpull.setLayoutMode(MODE_APPEND);//设置模板 mpull.setRefreshListener(new BaseRefreshListener() {
                @Override public void refresh() {
                    new Handler().postDelayed(new Runnable() {
                        @Override public void run() {
                            page=1;
                            presenter.getNews(show,page);
                            mpull.finishRefresh();
    
                        }
                    }, 3000);
    
                }
    
                @Override public void loadMore() {
                    new Handler().postDelayed(new Runnable() {
                                                  @Override public void run() {
                                                      page++;
                                                      presenter.getNews(show,page);
                                                      mpull.finishLoadMore();
    
                                                  }
                                              }, 3000
    
                    );
    
                }
            });
        }
    
        @Override public void success(String tag, List<JavaBean.DataBean> news) {
            list.clear();
            list.addAll(news);
            adapter.notifyDataSetChanged();
            adapter.setOnItemClickListener(new NewsListAdapter.OnItemClickListener() {
                @Override public void onClick(int position) {
                    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                    String url = list.get(position).getDetailUrl();
                    intent.putExtra("url",url);
                    startActivity(intent);
                }
    
                @Override public void onLongClick(int position) {
    
                }
            });
        }
    
        @Override public void failed(String tag, Exception e) {
    
        }
    }

HttpUtils-get请求

package com.bawei.com.wangruixin1509c20171113.httputils;
    
    import android.os.Handler;
    import android.text.TextUtils;
    
    import com.bawei.com.wangruixin1509c20171113.callback.CallBack;
    import com.bawei.com.wangruixin1509c20171113.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 Wangrx on 2017/11/13. */ public class HttpUtils {
        private static Handler handler = new Handler();
        private static volatile HttpUtils instance;
        private HttpUtils(){
    
        }
        public static HttpUtils getInstance(){
            if (null==instance){
                synchronized (HttpUtils.class){
                    if (instance == null){
                        instance = new HttpUtils();
                    }
                }
            }
            return instance;
        }
        public void get(String url, Map<String,String> map, final CallBack callBack, final Class cls, final String tag){
            if (TextUtils.isEmpty(url)){
                return;
            }
            StringBuffer sb = new StringBuffer();
            sb.append(url);
            if (url.contains("?")){
                if (url.indexOf("?")==url.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()
                    .addInterceptor(new LoggingInterceptor())
                    .build();
            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(tag,e);
                        }
                    });
                }
    
                @Override public void onResponse(Call call, Response response) throws IOException {
                    final String result = response.body().string();
                    //请求成功后做解析，通过自己的回调接口将数据返回去 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);
                        }
                    });
                }
            });
    
    
        }
    }

HttpUtils-post请求

package com.bwie.com.myapplication.httputils;
    
    import android.os.Handler;
    import android.util.Log;
    
    import com.bwie.com.myapplication.callback.CallBack;
    import com.bwie.com.myapplication.interceptor.LoggingInterceptor;
    
    import java.io.IOException;
    import java.util.Map;
    
    import okhttp3.Call;
    import okhttp3.FormBody;
    import okhttp3.OkHttpClient;
    import okhttp3.Request;
    import okhttp3.Response;
    
    /** * Created by Wangrx on 2017/11/21. */ 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;
        }
        /** * 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, final String tag) {
            OkHttpClient client = new OkHttpClient.Builder()
                    .addInterceptor(new LoggingInterceptor())
                    .build();
    
            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(tag,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(tag,o);
                        }
                    });
                }
            });
        }
    }

CallBack

package com.bawei.com.wangruixin1509c20171113.callback;
    
    /** * Created by Wangrx on 2017/11/13. */ public interface CallBack {
        void onSuccess(String tag,Object o);
        void onFailed(String tag,Exception e);
    }

INewsView

package com.bawei.com.wangruixin1509c20171113.httputils;
    
    import com.bawei.com.wangruixin1509c20171113.bean.JavaBean;
    
    import java.util.List;
    
    /** * Created by Wangrx on 2017/11/13. */ public interface INewsView {
        void success(String tag, List<JavaBean.DataBean> list);
        void failed(String tag,Exception e);
    }

LoggingInterceptor拦截器

package com.bawei.com.wangruixin1509c20171113.httputils;
    
    import java.io.IOException;
    
    import okhttp3.HttpUrl;
    import okhttp3.Interceptor;
    import okhttp3.Request;
    import okhttp3.Response;
    
    /** * Created by 笔片 on 2017/10/16. * 网络拦截器 */ public class LoggingInterceptor implements Interceptor{
        @Override public Response intercept(Chain chain) throws IOException {
            Request original = chain.request();
            HttpUrl url=original.url().newBuilder()
                    .addQueryParameter("source","android")
                    .build();
            //添加请求头 Request request = original.newBuilder()
                    .url(url)
                    .build();
            return chain.proceed(request);
        }
    
    }

GsonUtils

package com.bawei.com.wangruixin1509c20171113.utils;
    
    import com.google.gson.Gson;
    
    /** * Created by Wangrx on 2017/11/13. */ public class GsonUtils {
        private static Gson instance;
            private GsonUtils(){
    
            }
            public static Gson getInstance(){
                if (instance==null){
                    instance = new Gson();
                }
                return instance;
            }
    }

NewsPresenter

package com.bawei.com.wangruixin1509c20171113.presenter;
    
    import com.bawei.com.wangruixin1509c20171113.bean.JavaBean;
    import com.bawei.com.wangruixin1509c20171113.callback.CallBack;
    import com.bawei.com.wangruixin1509c20171113.httputils.HttpUtils;
    import com.bawei.com.wangruixin1509c20171113.httputils.INewsView;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /** * Created by Wangrx on 2017/11/13. */ public class NewsPresenter {
        private INewsView inv;
        public void attachView(INewsView inv){
            this.inv = inv;
        }
        public void getNews(String show,int page){
            Map<String, String> map = new HashMap<>();
            map.put("keywords",show);
            map.put("page",page+"");
            HttpUtils.getInstance().get("http://120.27.23.105/product/searchProducts", map, new CallBack() {
                @Override public void onSuccess(String tag, Object o) {
                    JavaBean bean = (JavaBean) o;
                    if (bean != null){
                        List<JavaBean.DataBean> data = bean.getData();
                        inv.success(tag,data);
    
                    }
                }
    
                @Override public void onFailed(String tag, Exception e) {
                    inv.failed(tag,e);
                }
            }, JavaBean.class,"news");
        }
        public void detachView(){
            if (inv!=null){
                inv = null;
            }
        }
    
    
    }

NewsListAdapter

package com.bawei.com.wangruixin1509c20171113.adapter;
    
    import android.content.Context;
    import android.graphics.Paint;
    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.wangruixin1509c20171113.R;
    import com.bawei.com.wangruixin1509c20171113.bean.JavaBean;
    import com.bumptech.glide.Glide;
    
    import java.util.List;
    
    /** * Created by Wangrx on 2017/11/13. */ public class NewsListAdapter extends RecyclerView.Adapter<NewsListAdapter.ViewHolder> {
    
        private Context context;
        private List<JavaBean.DataBean> list;
        private int count;
        public NewsListAdapter(Context context, List<JavaBean.DataBean> list,int count) {
            this.context = context;
            this.list = list;
            this.count = count;
        }
        private OnItemClickListener mOnItemClickListener;
    
        public interface OnItemClickListener{
            void onClick( int position);
            void onLongClick( int position);
        }
        public void setOnItemClickListener(OnItemClickListener onItemClickListener ){
            this. mOnItemClickListener=onItemClickListener;
        }
    
        @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (count==1){
                View v = View.inflate(context, R.layout.item, null);
                ViewHolder holder = new ViewHolder(v);
                return holder;
            }else if (count==2){
                View v = View.inflate(context, R.layout.item1, null);
                ViewHolder holder = new ViewHolder(v);
                return holder;
    
            }
            return null;
        }
    
        @Override public void onBindViewHolder(ViewHolder holder, final int position) {
            String[] split = list.get(position).getImages().split("[|]");
            Glide.with(context).load(split[0]).into(holder.item_img);
            holder.item_bargainPrice.setText("原价：￥"+list.get(position).getBargainPrice());
            holder.item_bargainPrice.getPaint().setFlags(Paint. STRIKE_THRU_TEXT_FLAG); //下划线 holder.item_bargainPrice.getPaint().setAntiAlias(true);//抗锯齿 holder.item_price.setText("折扣价：￥"+list.get(position).getPrice());
            holder.item_title.setText(list.get(position).getTitle());
            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();
        }
    
        public class ViewHolder extends RecyclerView.ViewHolder {
    
            private final ImageView item_img;
            private final TextView item_price;
            private final TextView item_bargainPrice;
            private final TextView item_title;
    
            public ViewHolder(View itemView) {
                super(itemView);
                item_img = itemView.findViewById(R.id.item_img);
                item_title = itemView.findViewById(R.id.item_title);
                item_price = itemView.findViewById(R.id.item_price);
                item_bargainPrice = itemView.findViewById(R.id.item_bargainPrice);
            }
        }
    }

Main2Activity.java

package com.bawei.com.wangruixin1509c20171113;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    
    public class Main2Activity extends AppCompatActivity {
    
        private WebView web;
    
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main2);
            Intent intent = getIntent();
            String url = intent.getStringExtra("url");
            web = (WebView) findViewById(R.id.web);
            web.loadUrl(url);
            web.setWebViewClient(new WebViewClient());
    
            WebSettings settings = web.getSettings();
            settings.setJavaScriptCanOpenWindowsAutomatically(true);
            settings.setJavaScriptEnabled(true);
        }
    }

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.wangruixin1509c20171113.MainActivity">
        <TextView android:id="@+id/tv_show"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:text="搜索商品"
            android:textSize="25sp"
            android:gravity="center"
            />
        <ImageView android:id="@+id/right"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/grid_icon"
            android:layout_alignParentRight="true"
            />
        <RelativeLayout android:id="@+id/rel"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_below="@+id/tv_show"
            android:layout_alignParentStart="true">
            <EditText android:id="@+id/et_sousuo"
                android:layout_width="300dp"
                android:layout_height="50dp"
                android:drawableLeft="@mipmap/a_4"
                android:hint="请输入关键字"
                />
            <Button android:id="@+id/btn_sousuo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@+id/et_sousuo"
                android:text="搜索"
                />
        </RelativeLayout>
        <com.jwenfeng.library.pulltorefresh.PullToRefreshLayout android:layout_width="match_parent"
            android:id="@+id/mpull"
            android:layout_below="@+id/rel"
            android:layout_height="match_parent">
            <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>
    
        </com.jwenfeng.library.pulltorefresh.PullToRefreshLayout>
    
    </RelativeLayout>

activity\_main2.xml

item.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="match_parent"
        android:orientation="horizontal">
        <ImageView android:id="@+id/item_img"
            android:layout_width="100dp"
            android:layout_height="100dp" />
    
        <RelativeLayout android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_toRightOf="@+id/item_img">
    
            <TextView android:id="@+id/item_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:text="title"
                android:textSize="16sp" />
    
            <TextView android:id="@+id/item_bargainPrice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/item_title"
                android:text="售价"
                android:layout_marginTop="10dp"
                android:textColor="#ccc"
                android:textSize="14sp" />
    
            <TextView android:id="@+id/item_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/item_title"
                android:layout_marginLeft="10dp"
                android:layout_toRightOf="@+id/item_bargainPrice"
                android:text="售价"
                android:layout_marginTop="10dp"
                android:textColor="#f00"
                android:textSize="14sp"
    
                />
    
        </RelativeLayout>
    
    </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.android.support:recyclerview-v7:26.0.0-alpha1'
    compile 'com.squareup.okhttp3:okhttp:3.9.0'
    compile 'com.google.code.gson:gson:2.8.2'
    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'com.jwenfeng.pulltorefresh:library:1.0.3'

[Center]: https://img-blog.csdn.net/20171113153046713?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveHk4MTk5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: /images/20220605/3ea7328b56434c3898756e001b517501.png
[http_120.27.23.105_product_searchProducts]: http://120.27.23.105/product/searchProducts