1、首先先导入需要用到的依赖包
//recyclerview用到的依賴包 compile 'com.android.support:recyclerview-v7:25.1.1' //网络请求依赖包 compile 'net.qiujuer.common:okhttp:3.0.0'AI 代码解读
2、在布局文件里面设置RecyclerView控件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context="com.example.administrator.okhttpdemo2.activity.MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerview" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView> </LinearLayout>AI 代码解读
3、写一个item布局
<?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"> <TextView android:id="@+id/texts" android:layout_width="match_parent" android:layout_height="50dp" android:background="#f0f" android:gravity="center" android:textSize="20sp" /> </LinearLayout>AI 代码解读
然后开始我们的代码工作
4、写需要用到的Bean（如果需要请求的数据多，需要什么数据就添加什么数据，不需要的可以不写，为了方便我只请求了一个数据条）
package com.example.administrator.okhttpdemo2.bean; import java.util.List; /** * Created by Administrator on 2017/5/25. */ public class Bean { private int code; private List<Data> data; private String msg; public Bean(int code, List<Data> data, String msg) { this.code = code; this.data = data; this.msg = msg; } public int getCode() { return code; } public void setCode(int code) { this.code = code; } public List<Data> getData() { return data; } public void setData(List<Data> data) { this.data = data; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } @Override public String toString() { return "Bean{" + "code=" + code + ", data=" + data + ", msg='" + msg + '\'' + '}'; } public class Data { private int id; private String efficacy; private String goods_img; public Data(int id, String efficacy, String goods_img) { this.id = id; this.efficacy = efficacy; this.goods_img = goods_img; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getEfficacy() { return efficacy; } public void setEfficacy(String efficacy) { this.efficacy = efficacy; } public String getGoods_img() { return goods_img; } public void setGoods_img(String goods_img) { this.goods_img = goods_img; } @Override public String toString() { return "Data{" + "id=" + id + ", efficacy='" + efficacy + '\'' + ", goods_img='" + goods_img + '\'' + '}'; } } }AI 代码解读
5、设置我们的适配器（就是RecyclerView的适配器，和普通的展示String数据不一样，不过也相差不多，看代码）
package com.example.administrator.okhttpdemo2.adapter; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.example.administrator.okhttpdemo2.R; import com.example.administrator.okhttpdemo2.bean.Bean; /** * Created by Administrator on 2017/5/25. */ public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder> { private Context context; private Bean bean; public MyAdapter(Context context, Bean bean) { this.context = context; this.bean = bean; } @Override public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) { MyHolder holder = new MyHolder(LayoutInflater.from(context).inflate(R.layout.item, parent, false)); return holder; } @Override public void onBindViewHolder(MyHolder holder, int position) { holder.texts.setText(bean.getData().get(position).getEfficacy()); } @Override public int getItemCount() { return bean.getData().size(); } class MyHolder extends RecyclerView.ViewHolder { TextView texts; public MyHolder(View itemView) { super(itemView); texts = (TextView) itemView.findViewById(R.id.texts); } } }AI 代码解读
6、添加已经封装好的OkHttp工具类，（不要嫌多，工具类直接粘过去用就行）
package com.example.administrator.okhttpdemo2.okhttp; import android.os.Handler; import android.os.Looper; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import java.util.concurrent.TimeUnit; import okhttp3.Call; import okhttp3.Callback; import okhttp3.FormBody; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.RequestBody; import okhttp3.Response; /** * Created by fan on 2016/11/9. */ public class OkHttp { /** * 静态实例 */ private static OkHttp sOkHttpManager; /** * okhttpclient实例 */ private OkHttpClient mClient; /** * 因为我们请求数据一般都是子线程中请求，在这里我们使用了handler */ private Handler mHandler; /** * 构造方法 */ private OkHttp() { mClient = new OkHttpClient(); /** * 在这里直接设置连接超时.读取超时，写入超时 */ mClient.newBuilder().connectTimeout(10, TimeUnit.SECONDS); mClient.newBuilder().readTimeout(10, TimeUnit.SECONDS); mClient.newBuilder().writeTimeout(10, TimeUnit.SECONDS); /** * 如果是用的3.0之前的版本 使用以下直接设置连接超时.读取超时，写入超时 */ //client.setConnectTimeout(10, TimeUnit.SECONDS); //client.setWriteTimeout(10, TimeUnit.SECONDS); //client.setReadTimeout(30, TimeUnit.SECONDS); /** * 初始化handler */ mHandler = new Handler(Looper.getMainLooper()); } /** * 单例模式 获取OkHttp实例 * * @return */ public static OkHttp getInstance() { if (sOkHttpManager == null) { sOkHttpManager = new OkHttp(); } return sOkHttpManager; } //-------------------------同步的方式请求数据-------------------------- /** * 对外提供的get方法,同步的方式 * * @param url 传入的地址 * @return */ public static Response getSync(String url) { //通过获取到的实例来调用内部方法 return sOkHttpManager.inner_getSync(url); } /** * GET方式请求的内部逻辑处理方式，同步的方式 * * @param url * @return */ private Response inner_getSync(String url) { Request request = new Request.Builder().url(url).build(); Response response = null; try { //同步请求返回的是response对象 response = mClient.newCall(request).execute(); } catch (IOException e) { e.printStackTrace(); } return response; } /** * 对外提供的同步获取String的方法 * * @param url * @return */ public static String getSyncString(String url) { return sOkHttpManager.inner_getSyncString(url); } /** * 同步方法 */ private String inner_getSyncString(String url) { String result = null; try { /** * 把取得到的结果转为字符串，这里最好用string() */ result = inner_getSync(url).body().string(); } catch (IOException e) { e.printStackTrace(); } return result; } //-------------------------异步的方式请求数据-------------------------- public static void getAsync(String url, DataCallBack callBack) { getInstance().inner_getAsync(url, callBack); } /** * 内部逻辑请求的方法 * * @param url * @param callBack * @return */ private void inner_getAsync(String url, final DataCallBack callBack) { final Request request = new Request.Builder().url(url).build(); mClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { deliverDataFailure(request, e, callBack); } @Override public void onResponse(Call call, Response response) throws IOException { String result = null; try { result = response.body().string(); } catch (IOException e) { deliverDataFailure(request, e, callBack); } deliverDataSuccess(result, callBack); } }); } /** * 分发失败的时候调用 * * @param request * @param e * @param callBack */ private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) { /** * 在这里使用异步处理 */ mHandler.post(new Runnable() { @Override public void run() { if (callBack != null) { callBack.requestFailure(request, e); } } }); } /** * 分发成功的时候调用 * * @param result * @param callBack */ private void deliverDataSuccess(final String result, final DataCallBack callBack) { /** * 在这里使用异步线程处理 */ mHandler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.requestSuccess(result); } catch (Exception e) { e.printStackTrace(); } } } }); } /** * 数据回调接口 */ public interface DataCallBack { void requestFailure(Request request, IOException e); void requestSuccess(String result) throws Exception; } }AI 代码解读
最后一步就是进行MainActivity里面的代码工作
package com.example.administrator.okhttpdemo2.activity; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import com.example.administrator.okhttpdemo2.R; import com.example.administrator.okhttpdemo2.adapter.MyAdapter; import com.example.administrator.okhttpdemo2.bean.Bean; import com.example.administrator.okhttpdemo2.okhttp.OkHttp; import com.google.gson.Gson; import java.io.IOException; import okhttp3.Request; public class MainActivity extends AppCompatActivity { private RecyclerView recyclrview; private Bean bean; private MyAdapter myAdapter; private String path = "http://m.yunifang.com/yunifang/mobile/goods/getall?random=39986&encode=2092d7eb33e8ea0a7a2113f2d9886c90&category_id=17"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setOkHttp(); } public void setRecyclerView() { recyclrview = (RecyclerView) findViewById(R.id.recyclerview); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); recyclrview.setLayoutManager(linearLayoutManager); myAdapter = new MyAdapter(MainActivity.this, bean); recyclrview.setAdapter(myAdapter); } public void setOkHttp() { OkHttp.getAsync(path, new OkHttp.DataCallBack() { @Override public void requestFailure(Request request, IOException e) { } @Override public void requestSuccess(String result) throws Exception { Gson gson = new Gson(); bean = gson.fromJson(result, Bean.class); setRecyclerView(); } }); } }AI 代码解读
别忘记了在Androidapplication.xml里面添加联网权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>AI 代码解读
搞定，明白里面的过程其实很简单的，希望对其他新手同学有所帮助
