Android: handle unexpected internet disconnect while downloading data
- by M.A. Cape
Hi, I have here a function that downloads data from a remote server to file. I am still not confident with my code. My question is, what if while reading the stream and saving the data to a file and suddenly I was disconnected in the internet, will these catch exceptions below can really catch that kind of incident? If not, can you suggest how to handle this kind of incident?
Note: I call this function in a thread so that the UI won't be blocked.
public static boolean getFromRemote(String link, String fileName, Context context){
boolean dataReceived = false;
ConnectivityManager connec = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connec.getNetworkInfo(0).isConnected() || connec.getNetworkInfo(1).isConnected()){
try {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(link);
HttpParams params = httpClient.getParams();
HttpConnectionParams.setConnectionTimeout(params, 30000);
HttpConnectionParams.setSoTimeout(params, 30000);
HttpResponse response;
response = httpClient.execute(httpGet);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200){
HttpEntity entity = response.getEntity();
InputStream in = null;
OutputStream output = null;
try{
in = entity.getContent();
String secondLevelCacheDir = context.getCacheDir() + fileName;
File imageFile = new File(secondLevelCacheDir);
output= new FileOutputStream(imageFile);
IOUtilities.copy(in, output);
output.flush();
} catch (IOException e) {
Log.e("SAVING", "Could not load xml", e);
} finally {
IOUtilities.closeStream(in);
IOUtilities.closeStream(output);
dataReceived = true;
}
}
}catch (SocketTimeoutException e){
//Handle not connecting to client !!!!
Log.d("SocketTimeoutException Thrown", e.toString());
dataReceived = false;
} catch (ClientProtocolException e) {
//Handle not connecting to client !!!!
Log.d("ClientProtocolException Thrown", e.toString());
dataReceived = false;
}catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
dataReceived = false;
Log.d("MalformedURLException Thrown", e.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
dataReceived = false;
Log.d("IOException Thrown", e.toString());
}
}
return dataReceived;
}
