I'm following a course on udacity 'Developing Android Apps'. Following is the code of ForecastFragment class which is suppose to get data in json format from the url(http://api.openweathermap.org/data/2.5/forecast/daily?q=Delhi,in&mode=json&cnt=7&units=metric).
public class ForecastFragment extends Fragment {
public ForecastFragment() {
}
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
String[] data = {
"Today-Sunny-34", "Tommorow-Rainy-233", "Wednesday-Cloudy-21", "Thursday-Monayblue-18", "Frida-Rainy-23", "Saturday-Rainy-22", "Sunday-Strorm-100"
};
List<String> weekForecast = new ArrayList<String>(Arrays.asList(data));
ArrayAdapter<String> mForecastAdapter = new ArrayAdapter<String>(getActivity(), R.layout.list_item_forecast, R.id.list_item_forecast_textview, weekForecast);
ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
listView.setAdapter(mForecastAdapter);
return rootView;
}
public void onCreateOptionsMenu(Menu menu,MenuInflater inflater){
inflater.inflate(R.menu.forecastfragment, menu);
}
public boolean onOptionsItemSelected(MenuItem item){
int id = item.getItemId();
if(id==R.id.action_refresh){
FetchWeatherTask fetch = new FetchWeatherTask();
fetch.execute();
return true;}
return super.onOptionsItemSelected(item);
}
public class FetchWeatherTask extends AsyncTask<Void,Void,Void>{
private final String LOG_TAG = FetchWeatherTask.class.getSimpleName();
@Override
protected Void doInBackground(Void... params) {
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String forecastJsonStr = null;
try {
URL url = new URL("http://api.openweathermap.org/data/2.5/forecast/daily?q=Delhi,in&mode=json&cnt=7&units=metric");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) return null;
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
}
if (buffer.length() == 0) return null;
forecastJsonStr = buffer.toString();
Log.v(LOG_TAG,"Forecast Json String" + forecastJsonStr);
} catch (IOException e) {
Log.e(LOG_TAG, "Error", e);
return null;
} finally {
if (urlConnection != null) urlConnection.disconnect();
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("placeholder fragment", "error closing stream", e);
}
}
}
return null;
}
}
}
However, I'm repeatedly getting this error.
07-20 12:49:14.063 2392-2486/com.example.android.sunshine.app E/FetchWeatherTask﹕ Error
java.net.UnknownHostException: api.openweathermap.org
at java.net.InetAddress.lookupHostByName(InetAddress.java:512)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:300)
at java.net.InetAddress.getAllByName(InetAddress.java:259)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205)
at com.example.android.sunshine.app.ForecastFragment$FetchWeatherTask.doInBackground(ForecastFragment.java:119)
at com.example.android.sunshine.app.ForecastFragment$FetchWeatherTask.doInBackground(ForecastFragment.java:83)
at android.os.AsyncTask$2.call(AsyncTask.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
at java.lang.Thread.run(Thread.java:1027)
Following are the things I've already checked:-
- mobile phone has internet access.
AndroidManifest.xml declares the permission for internet usage.
The url works fine in the browser,but I'm clueless as to why this error is coming up.
Also, I'm running the app on my android phone(api 10).
If anyone could please provide a solution or point me in the right direction,it would be great. Thank you.
