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所以我打算做一个应用程序,为您提供当前位置的天气。现在我知道我的当前坐标,我写了下面的代码:天气API和HttpURLConnection
MainActivity.java
//..... (previous codes obtain the coordinate, and working)
RetrieveWeather mRetrieveWeather = new RetrieveWeather();
t.append("" + mRetrieveWeather.getWeatherReport(mCoordinate));
RetrieveWeather.java
package com.example.maest.weather;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Created by maest on 2016/9/28.
*/
public class RetrieveWeather {
public String getWeatherReport(double[] mCoordinate){
HttpURLConnection mHttpUrlConnection = null;
InputStream mInputStream = null;
try{
mHttpUrlConnection = (HttpURLConnection) (new URL("http://api.openweathermap.org/data/2.5/forecast?lat=38.868884&lon=-77.053086&appid=myid)).openConnection();
mHttpUrlConnection.setRequestMethod("GET");
mHttpUrlConnection.setDoInput(true);
mHttpUrlConnection.connect();
StringBuffer mStringBuffer = new StringBuffer();
mInputStream = mHttpUrlConnection.getInputStream();
BufferedReader mBufferedReader = new BufferedReader(new InputStreamReader(mInputStream));
String mString = null;
while ((mString = mBufferedReader.readLine()) != null)
mStringBuffer.append(mString + "\n");
mInputStream.close();
mHttpUrlConnection.disconnect();
return mStringBuffer.toString();
}catch (Throwable t){
t.printStackTrace();
}finally{
try { mInputStream.close();}catch(Throwable t) {}
try { mHttpUrlConnection.disconnect();}catch(Throwable t) {}
}
return "You failed again!";
}
}
注意,URL是有效的,但我取代了我的appid这里。
每次运行此代码时,TextView都会显示“您再次失败!”。
为什么?
(附注:我有内部清单足够的用户权限)
你应该看看你的LogCat,但你的问题可能是一个NetworkOnMainThread异常 –
有很容易的网络库使用,顺便说一句 –