利用json获取天气信息
天气预报信息获取是利用json获取的,网上有很多资源,源代码。由于上面涉及到很多天气信息,包括湿度,出行建议等,以及添加了所有城市代码的资源包。为了练手了解json的原理。我仅获取诚笃城市的最高温,最低温,城市名字。
我的布局是通过一个按钮获取城市名字,最高温,最低温。main.xnl代码如下
<?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="vertical" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="城市名称:" /> <EditText android:id="@+id/tx_cityname" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" > </EditText> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="最高温度:" /> <EditText android:id="@+id/tx_height" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="最低温度:" /> <EditText android:id="@+id/tx_low" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" /> <Button android:id="@+id/button_refresh" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="获取实时天气信息" > </Button> </LinearLayout>
本工程含有2个java文件分别是WheatherLck.java和WheatherInfo.java文件。WheatherLck.java代码如下
package com.hiden.weatherdemo; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.util.EntityUtils; import org.json.JSONException; import org.json.JSONObject; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.content.Intent; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; public class WeatherLck extends Activity { // 创建三个全局的文本框对象 EditText TX_CITYNAME,TX_HEIGHT,TX_LOW; private String city_str="成都"; Button button_refresh; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); // 获取布局中的文本框 TX_CITYNAME=(EditText)this.findViewById(R.id.tx_cityname); TX_CITYNAME.setText(city_str); TX_HEIGHT=(EditText)this.findViewById(R.id.tx_height); TX_LOW=(EditText)this.findViewById(R.id.tx_low); button_refresh=(Button)findViewById(R.id.button_refresh); button_refresh.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub if(v==button_refresh){ refresh(city_str); } } }); /************************************************************************************** * 获取http://m.weather.com.cn/data/101091106.html上面的数据 * 其中101091106为城市代码,上面我已经把城市代码做了修改,去除了空行,格式为UTF-8 * 每次只是运行一次线程,然后加入主线程回收 * @param city_str * @throws JSONException * @throws Exception * @throws ClientProtocolException */ private Thread thread; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg){ switch(msg.what){ case 1: JSONObject weather = (JSONObject) msg.obj; refreshUI(weather); try { thread.join(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } } }; /************************************************************************ * 在主线程中不能请求网络 * 线程没有while循环只是执行一次,如果有溢出可能不能发送消息 * @param city_str */ private void requestWeather(final String city_str){ thread = new Thread(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub String url="http://www.weather.com.cn/data/cityinfo/101270101.html"; HttpClient client = new DefaultHttpClient(); HttpGet httpget = new HttpGet(url); HttpResponse response; String sbuf = null; try { response = client.execute(httpget); HttpEntity httpentity = response.getEntity(); if(httpentity != null){ BufferedReader br = new BufferedReader(new InputStreamReader(httpentity.getContent(),"utf-8")); sbuf = br.readLine(); } JSONObject object = new JSONObject(sbuf); JSONObject data = (JSONObject) object.getJSONObject("weatherinfo"); //Log.i(TAG, data.toString()); Message msg = new Message(); msg.what = 1; msg.obj = data; handler.sendMessage(msg); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); thread.start(); } protected void refresh(String city_str) { requestWeather(city_str); } private void refreshUI(JSONObject jsonobject){ JSONObject jsonData = jsonobject; try { TX_CITYNAME.setText(jsonData.getString("city")); // 取得高温数据 TX_HEIGHT.setText(jsonData.getString("temp1")); // 取得低温数据 TX_LOW.setText(jsonData.getString("temp2")); }catch(Exception e){ e.printStackTrace(); } } }
WheatherInfo.java代码如下:
package com.hiden.weatherdemo.ui; public class WeatherInfo { String city = ""; String temp1 = ""; String temp2 = "";// 椋庡悜 public String getCity() { return city; } public void setCity(String city) { this.city = city; } @Override public String toString() { return "WeatherInfo [city=" + city + ", temp1=" + temp1 + ", temp2=" + temp2 + "]"; } public String getTemp1() { return temp1; } public void setTemp1(String temp) { this.temp1 = temp; } public String getTemp2() { return temp2; } public void setTemp2(String temp) { this.temp2 = temp; } }点击按钮,获得到成都的最高温度和最低温度,效果图如下:
当然,大家可以根据自己的需求做出更详细的效果图,比如添加未来5天的天气,定位,添加关注城市等功能。网上资源比较多,大家可以多练习练习。
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