通过查找资料及自己开发完成

来源：互联网发布：寻秦记赵倩知乎编辑：程序博客网时间：2024/06/06 12:41

<span style="color:#33ff33;">前期分析：需要三个类完成：一个主类、一个请求类、一个数据处理类<span style="white-space:pre"></span>MainActivity、HttpRequestTools、AnalyseTools</span>

<span style="color:#33ff33;"><span style="white-space:pre"></span>小伙伴们需要自己获取百度的天气API的请求接口及apikey;</span>

<span style="color:#33ff33;"><span style="white-space:pre"></span>应用到的Android知识：（简单到复杂）：界面的布局--JSON数据的解析--数据的传递--网络通信--线程的使用</span>

1.主类

<pre name="code" class="java">package com.example.baidutq;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.app.Activity;public class MainActivity extends Activity {//声明apikeyprivate static final String apiKey="小伙伴自己获取";//上传请求的地址信息private String httpUrl = "http://apis.baidu.com/apistore/weatherservice/cityname";//用户输入的城市信息  private String httpArg = null;      private Handler handler=null;      private EditText cityET;      private TextView showInfo;      private ImageView imageView;      private String cityName=null;     private Button btn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);intiView();  btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {try {//注意在api文档中他没有提及直接用汉字传输信息是不行的,这里需要将用户输入的城市信息进行网络编码                  //例如北京编码完成后就变成了%E5%8C%97%E4%BA%AC cityName = URLEncoder.encode(cityET.getText().toString(),"UTF-8");//转码} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}httpArg = "cityname="+cityName;/*--------------------------------------重点--------------------------------------------*///发送获取天气请求HttpRequestTools httpRequestTools = new HttpRequestTools(httpUrl, httpArg, apiKey, showInfo, imageView, handler);httpRequestTools.start();/*--------------------------------------重点--------------------------------------------*/}});}private void intiView() { cityET=(EditText) findViewById(R.id.ctyi_name); btn=(Button) findViewById(R.id.btn_chak); imageView=(ImageView) findViewById(R.id.show_Image); showInfo=(TextView) findViewById(R.id.text_show);  handler = new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);}  }; }}

2.请求类

<pre name="code" class="java">package com.example.baidutq;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import org.apache.http.HttpClientConnection;import android.os.Handler;import android.widget.ImageView;import android.widget.TextView;//这个类用来提交请求并接收服务器给我们返回的天气数据//因为需要访问网络，会耗时所以需要创建新的线程，所以继承Threadpublic class HttpRequestTools  extends Thread{//需要的相关参数：String httpUrl,httpArg,apikey;public TextView show;//显示数据ImageView imageView;//显示天气图片//通信的HandleHandler handler;//创建构造函数public HttpRequestTools(String httpUrl, String httpArg, String apikey,TextView show, ImageView imageView, Handler handler) {super();this.httpUrl = httpUrl;this.httpArg = httpArg;this.apikey = apikey;this.show = show;this.imageView = imageView;this.handler = handler;}@Overridepublic void run() {super.run();//缓存得到的数据StringBuffer buffer = new StringBuffer();BufferedReader reader=null;String result=null;//创建api的url组合httpUrl=httpUrl+"?"+httpArg;try {/*-----------------------------------重点------------------------------------------------*///创建请求的urlURL url = new URL(httpUrl);//发送获取天气的请求 HttpURLConnection connection = (HttpURLConnection) url.openConnection();//打开请求--链接请求 connection.setRequestMethod("GET");//请求方式 connection.setRequestProperty("apikey", apikey);//请求key connection.connect();//提交请求  //接受传回的数据---保存到数据流中 InputStream in = connection.getInputStream(); reader= new BufferedReader(new InputStreamReader(in, "UTF-8")); String str;  while ((str=reader.readLine())!=null) {buffer.append(str+"\n");} //数据接受完，关闭流操作 reader.close(); in.close();   result=buffer.toString();  //对得到数据进行Json解析 AnalyseTools analyseTools = new AnalyseTools(result); //解析后的数据AnalyseText final String finalResult = analyseTools.AnalyseText();  //更新数据 handler.post(new Runnable() {@Overridepublic void run() {show.setText(finalResult);//显示返回的数据if (finalResult.contains("多云")) {imageView.setImageResource(R.drawable.duoyun);}else if (finalResult.contains("晴")) {imageView.setImageResource(R.drawable.qing);}else if (finalResult.contains("雨")) {imageView.setImageResource(R.drawable.yu);}else if (finalResult.contains("阴")) {imageView.setImageResource(R.drawable.yin);}else if (finalResult.contains("雪")) {imageView.setImageResource(R.drawable.xue);}}});} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

3.数据处理类

package com.example.baidutq;import org.json.JSONException;import org.json.JSONObject;//对数据进行处理public class AnalyseTools {      String receiveInfo=null;          //构造方法传入解析的JSON数据    AnalyseTools(String JsonText)      {          receiveInfo=JsonText;      }          //解析接受的文本信息    public String AnalyseText(){            String weatherInfo=null;  //天气的信息        //先判断一下天气是否获取成功,如果没成功会有errNum:-1提示          if(receiveInfo.contains("\"errNum\":-1"))  //失败的标志        {              weatherInfo="请求天气数据失败,请稍后再试";          }          else {              try {                  //使用Json来解析文本数据                  JSONObject jsonObject = new JSONObject(receiveInfo);                  //定位到retData关键词                  JSONObject json = (JSONObject) jsonObject.get("retData");                  StringBuffer sb = new StringBuffer();                  sb.append("城市: " + json.getString("city") + "\n");                  sb.append("日期: " + json.getString("date") + "\n");                  sb.append("发布时间: " + json.getString("time") + "\n");                  sb.append("天气情况: " + json.getString("weather") + "\n");                  sb.append("温度: " + json.getString("temp") + "\n");                  sb.append("最低气温: " + json.getString("l_tmp") + "\n");                  sb.append("最高气温: " + json.getString("h_tmp") + "\n");                  sb.append("风向: " + json.getString("WD") + "\n");                  sb.append("风力: " + json.getString("WS") + "\n");                  sb.append("日出时间: " + json.getString("sunrise") + "\n");                  sb.append("日落时间: " + json.getString("sunset") + "\n");                  weatherInfo = sb.toString();                } catch (JSONException e) {                  e.printStackTrace();              }          }          return weatherInfo;      }    }

4.相关的布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <ImageView        android:id="@+id/show_Image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         android:src="@drawable/mm"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <EditText            android:id="@+id/ctyi_name"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="例如："上海" />        <Button            android:id="@+id/btn_chak"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/btn_chak" />    </LinearLayout>    <TextView        android:id="@+id/text_show"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

5.截图：

如果想要跟丰富的界面效果，就要小伙伴们自己设计实现了。

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