Hi fellow developers,
I am going bald with this, ripping my hairs.
I spend hours searching google, anddev, stack overflow and forums to
no extent, I have found nothing.
I'm designing a simple app, for my first, that get datas from a web
service.
The main ui launch a thread that will act as a worker, which will send
messages to the ui to give indication to the user what is going on.
At the moment the app is launched, the worker thread sends a
PAGE_LOADING message, which triggers a progressDialog display.
On the PAGE_LOADED message, the progressDialog is dissmissed.
I see that progressDialog.
Now, if I ask the thread to load another page, I see the PAGE_LOADING
message coming to the ui thread, but no progressDialog is displayed
anymore.
Same thing if I trigger another action that should display the
progressDialog...
Can anyone explain me what is wrong with my code?
ui code:
public class MainActivity extends Activity implements ShakerCallback {
final int ID_CONFIG = 10;
final int ID_REFRESH = 20;
private WatchKeys keys = null;
private KivaWorker kivaWrkr = null;
private ProgressDialog pd;
public final Handler mHandlerKiva = new Handler() {
@Override
public void
handleMessage(Message msg) {
KivaMessage kMsg;
KivaLoan kLoan;
switch (msg.what) {
case
KivaMessage.MSG_LOAN:
kLoan =
(KivaLoan) msg.obj;
Log.d("kiva_thread", "loan received");
Log.d("kiva_thread", kLoan.toString());
inProgress("Loading...");
compose(kLoan);
doneProgress();
break;
case
KivaMessage.MSG_PAGE_LOADING:
kMsg =
(KivaMessage) msg.obj;
Log.d("kiva_thread", kMsg.msg);
inProgress(kMsg.msg);
break;
case
KivaMessage.MSG_PAGE_LOADED:
kMsg =
(KivaMessage) msg.obj;
Log.d("kiva_thread", kMsg.msg);
doneProgress();
break;
default:
kMsg =
(KivaMessage) msg.obj;
Log.d("kiva_thread", kMsg.msg);
break;
}
}
};
private void inProgress(String msg) {
Log.i("pg", "show progress");
//pd = new
ProgressDialog(this.getApplicationContext()); //Crash on
pd.show() ???
pd = new ProgressDialog(this);
pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pd.setIndeterminate(true);
pd.setTitle("Processing");
pd.setMessage(msg);
pd.show();
}
/**
* Dismiss a previously opened ProgressDialog
*/
private void doneProgress() {
pd.dismiss();
pd=null;
Log.i("pg", "hide progress");
}
Worker thread:
public class KivaWorker extends Thread {
private final Handler mHandler;
final static int MSG_REFRESH = 10, MSG_LOAN_LOADED = 20;
private final boolean threadRun = true;
public int page = 1;
public int loanIdx = 0;
final static String URL_LOAN = "http://api.kivaws.org/v1/
loans/newest.json";
private Context ctx = null;
public List<KivaLoan> loans;
public KivaWorker(Handler mHandler, Context ctx) {
this.mHandler = mHandler;
this.ctx = ctx;
this.start();
}
/**
* Worker function. Update with an up to date datas about
available loans from Kiva.
*
* @param url
*/
public void getLatestLoans(String url, int page) {
Message msg = new Message();
KivaMessage kMsg;
kMsg = new KivaMessage("Loading page " + this.page);
msg.what = KivaMessage.MSG_PAGE_LOADING;
msg.obj = kMsg;
this.mHandler.sendMessage(msg);
if (url == null) {
url = KivaWorker.URL_LOAN;
}
url = url + "?page=" + page;
final HttpClient httpclient = new DefaultHttpClient();
String result = "";
JSONObject json = new JSONObject();
// Prepare a request object
final HttpGet httpget = new HttpGet(url);
final ResponseHandler<String> handler = new
BasicResponseHandler();
// you result will be String :
try {
result = httpclient.execute(httpget, handler);
}
catch (final ClientProtocolException e) {
e.printStackTrace();
}
catch (final IOException e) {
e.printStackTrace();
}
try {
json = new JSONObject(result);
}
catch (final JSONException e) {
e.printStackTrace();
}
try {
final JSONArray loans = json.getJSONArray("loans");
final JSONObject paging = json.getJSONObject("paging");
this.page = paging.getInt("page");
final List<KivaLoan> aryLoans = new ArrayList<KivaLoan>();
for (int i = 0; i < loans.length(); i++) {
aryLoans.add(new KivaLoan(loans.getJSONObject(i),
this.ctx, this.mHandler));
}
this.loans = aryLoans;
}
catch (final JSONException e) {
e.printStackTrace();
}
msg = new Message();
kMsg = new KivaMessage("Finished loading page " + this.page);
msg.what = KivaMessage.MSG_PAGE_LOADED;
msg.obj = kMsg;
this.mHandler.sendMessage(msg);
// Alerts.showAlert("", this);
}
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