JSON之三:获取JSON文本并解释(以google的天气API为例) 分类: C_OHTERS 2014-05-14 16:35 2209人阅读 评论(0) 收藏
google提供了天气的api,以广州天气为例,地址为:
http://api.openweathermap.org/data/2.5/weather?q=guangzhou
返回的结果为:
{
"coord": {
"lon": 113.25,
"lat": 23.12
},
"sys": {
"message": 0.2088,
"country": "CN",
"sunrise": 1400017567,
"sunset": 1400065233
},
"weather": [
{
"id": 501,
"main": "Rain",
"description": "moderate rain",
"icon": "10d"
}
],
"base": "cmc stations",
"main": {
"temp": 299.818,
"temp_min": 299.818,
"temp_max": 299.818,
"pressure": 1004.54,
"sea_level": 1014.72,
"grnd_level": 1004.54,
"humidity": 97
},
"wind": {
"speed": 4.42,
"deg": 201.501
},
"rain": {
"3h": 6
},
"clouds": {
"all": 44
},
"dt": 1400055192,
"id": 1809858,
"name": "Guangzhou",
"cod": 200
}
因此,在本范例中,写一个天气查询的DEMO,用于输入地点,并查询天气情况。
项目更新请见:https://code.csdn.net/jediael_lu/googleweatherparse/tree/master
效果如下:
详细步骤如下:
1、主界面布局文件
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="15dp" android:text="@string/location" android:textAppearance="?android:attr/textAppearanceMedium" /> <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView1" android:layout_alignParentRight="true" android:ems="10" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="68dp" android:text="@string/country" android:textAppearance="?android:attr/textAppearanceSmall" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView2" android:layout_marginTop="19dp" android:text="@string/temperature" android:textAppearance="?android:attr/textAppearanceSmall" /> <TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView3" android:layout_below="@+id/textView3" android:layout_marginTop="32dp" android:text="@string/humidity" android:textAppearance="?android:attr/textAppearanceSmall" /> <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView4" android:layout_below="@+id/textView4" android:layout_marginTop="21dp" android:text="@string/pressure" android:textAppearance="?android:attr/textAppearanceSmall" /> <EditText android:id="@+id/editText2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView3" android:layout_toRightOf="@+id/textView3" android:ems="10" > <requestFocus /> </EditText> <EditText android:id="@+id/editText3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView3" android:layout_alignBottom="@+id/textView3" android:layout_alignLeft="@+id/editText2" android:ems="10" /> <EditText android:id="@+id/editText4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView5" android:layout_alignLeft="@+id/editText1" android:ems="10" /> <EditText android:id="@+id/editText5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView5" android:layout_alignBottom="@+id/textView5" android:layout_alignRight="@+id/editText4" android:ems="10" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editText2" android:layout_below="@+id/editText1" android:onClick="open" android:text="@string/weather" /> </RelativeLayout>
2、定义String.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">JSONParser</string> <string name="action_settings">Settings</string> <string name="hello_world">Hello world!</string> <string name="location">Location</string> <string name="country">Country:</string> <string name="temperature">Temperature:</string> <string name="humidity">Humidity:</string> <string name="pressure">Pressure:</string> <string name="weather">Weather</string> </resources>
3、在AndroidManifest.xml中添加internet访问权限。
4、创建一个bean,用于保存天气信息。
package com.example.jsonparser.model; public class WeatherBean { private String country; private int Temperature; private int humidity; private int pressure; public String getCountry() { return country; } public void setCountry(String country) { this.country = country; } public int getTemperature() { return Temperature; } public void setTemperature(int temperature) { Temperature = temperature; } public int getHumidity() { return humidity; } public void setHumidity(int humidity) { this.humidity = humidity; } public int getPressure() { return pressure; } public void setPressure(int pressure) { this.pressure = pressure; } }
5、创建用于访问网络的类,并返回JSON文本。
package com.example.jsonparser; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; public class JSONFetcher { private String jsonText = ""; //本方法通过指定url访问网络数据,并返回JSON格式的string。 public String getJSONText(final URL url){ Thread thread = new Thread(new Runnable(){ @Override public void run() { InputStream is =null; BufferedReader in = null; try { HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(10000 /* milliseconds */); conn.setConnectTimeout(15000 /* milliseconds */); conn.setRequestMethod("GET"); conn.setDoInput(true); conn.connect(); is = conn.getInputStream(); in = new BufferedReader(new InputStreamReader(is)); String line = ""; while((line = in.readLine()) != null){ jsonText += line; } } catch (IOException e) { e.printStackTrace(); }finally{ try { in.close(); is.close(); } catch (IOException e) { e.printStackTrace(); } } } }); thread.start(); //等待上述线程完成执行后再返回jsonText。 try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } return jsonText; } }
6、创建用于处理JSON文本的类,返回一个WeatherBean对象。
package com.example.jsonparser; import java.net.URL; import org.json.JSONException; import org.json.JSONObject; import com.example.jsonparser.model.WeatherBean; public class JSONUtil { public static WeatherBean getWeatherBean(URL url){ String jsonText = new JSONFetcher().getJSONText(url); System.out.println(jsonText); WeatherBean weather = new WeatherBean(); try { JSONObject weatherJSONObject = new JSONObject(jsonText); JSONObject sysJSONObject = weatherJSONObject.getJSONObject("sys"); String country = sysJSONObject.getString("country"); JSONObject mainJSONObject = weatherJSONObject.getJSONObject("main"); int temperature = mainJSONObject.getInt("temp"); int pressure = mainJSONObject.getInt("pressure"); int humidity = mainJSONObject.getInt("humidity"); weather.setCountry(country); weather.setTemperature(temperature); weather.setHumidity(humidity); weather.setPressure(pressure); } catch (JSONException e) { System.out.println("test"); e.printStackTrace(); } return weather; } }
7、主布局文件,将WeatherBean中的内容在手机中展现。
package com.example.jsonparser; import java.net.URL; import com.example.jsonparser.model.WeatherBean; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.EditText; public class MainActivity extends Activity { private String url1 = "http://api.openweathermap.org/data/2.5/weather?q="; private EditText location, country, temperature, humidity, pressure; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); location = (EditText) findViewById(R.id.editText1); country = (EditText) findViewById(R.id.editText2); temperature = (EditText) findViewById(R.id.editText3); humidity = (EditText) findViewById(R.id.editText4); pressure = (EditText) findViewById(R.id.editText5); } public void open(View view) { try { URL url = new URL(url1 + location.getText().toString()); System.out.println(url); WeatherBean weatherBean = JSONUtil.getWeatherBean(url); country.setText(weatherBean.getCountry()); humidity.setText(weatherBean.getHumidity() + ""); pressure.setText(weatherBean.getPressure() + ""); temperature.setText(weatherBean.getTemperature() + ""); System.out.println("test2"); } catch (Exception e) { e.printStackTrace(); } } }
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