There are 2 functions required for the call: 1) makeHTTPRequest and 2) handleHTTPResponse. Sample code for each of these is provided below.
makeHTTPRequest
private void makeHTTPRequest() {
// Increment counter so we don't try infinite number of http requests
// httpTryCount declared as a private class variable: private int httpTryCount = 0;
httpTryCount++;
// Show dialog
// progressDialog1 declared as class variable: private ProgressDialog progressDialog1 = null;
progressDialog1 = ProgressDialog.show(FoodDetail.this, "", "Loading...", true, false);
// Fire off a thread to do some work that we shouldn't do directly in the UI thread
Thread t = new Thread() {
public void run() {
try {
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, Constants.connectionTimeout);
HttpConnectionParams.setSoTimeout(httpParameters, Constants.socketTimeout);
HttpClient httpclient = new DefaultHttpClient(httpParameters);
String requestURL = "http://www.yoursite.com/data_feed.php?id=5";
//Log.d(TAG,requestURL);
HttpGet httpget = new HttpGet(requestURL);
// Create a response handler
ResponseHandler responseHandler = new BasicResponseHandler();
strResponse = httpclient.execute(httpget, responseHandler);
handler.sendEmptyMessage(0);
} catch (Exception e) {
//Log.d(TAG, "Error occurred during load "+ e);
handler.sendEmptyMessage(-1);
} //try
} //run()
}; //thread
t.start();
}
handleHTTPResponse
private Handler handler = new Handler() {
@Override
public void handleHTTPResponse(Message msg) {
// close loading progress dialog
progressDialog1.dismiss();
// If timeout, try again -- try maximum of 2 times
if(msg.what == -1 && httpTryCount < 2) makeHTTPRequest();
else if(msg.what == -1 && httpTryCount >= 2) {
// If 2 failed attempts, show error message
Builder builder = new AlertDialog.Builder(FoodDetail.this);
builder.setTitle("Oops");
builder.setMessage("An error occurred. Please make sure you are connected and try again.");
builder.setPositiveButton("ok", null);
builder.show();
} else if(msg.what == 0) {
httpTryCount = 0;
// Do something with your returned data, strResponse, here
}
Log.d(TAG, "response handler: "+msg);
Log.d(TAG, "response text: "+strResponse);
};
};
The inline comments should give you an idea of what is going on in each function. (Several class variables are described in the comments.)
Enjoy your new UI-friendly asynchronous web requests.
