网站一般做多大像素/如何推广一个平台-拓冰网页制作

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'

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.RecyclerViewandroid:id="@+id/recyclerview"android:layout_width="match_parent"android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></LinearLayout>

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"><TextViewandroid:id="@+id/texts"android:layout_width="match_parent"android:layout_height="50dp"android:background="#f0f"android:gravity="center"android:textSize="20sp" /></LinearLayout>

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;}@Overridepublic 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;}@Overridepublic String toString() {return "Data{" +"id=" + id +", efficacy='" + efficacy + '\'' +", goods_img='" + goods_img + '\'' +'}';}}
}

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;}@Overridepublic MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {MyHolder holder = new MyHolder(LayoutInflater.from(context).inflate(R.layout.item, parent, false));return holder;}@Overridepublic void onBindViewHolder(MyHolder holder, int position) {holder.texts.setText(bean.getData().get(position).getEfficacy());}@Overridepublic 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);}}
}

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() {@Overridepublic void onFailure(Call call, IOException e) {deliverDataFailure(request, e, callBack);}@Overridepublic 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() {@Overridepublic 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() {@Overridepublic 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;}
}

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";@Overrideprotected 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() {@Overridepublic void requestFailure(Request request, IOException e) {}@Overridepublic void requestSuccess(String result) throws Exception {Gson gson = new Gson();bean = gson.fromJson(result, Bean.class);setRecyclerView();}});}
}

别忘记了在Androidapplication.xml里面添加联网权限

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

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

网站一般做多大像素如何推广一个平台

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