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2014/10/16 ¤W¤È 08:12:35
android Programming Glossary: doinbackgroundHow to check internet access on Android? InetAddress never timeouts http://stackoverflow.com/questions/1560788/how-to-check-internet-access-on-android-inetaddress-never-timeouts to check the network access to a host name. But the doInBackground is never timed out. Anyone have a clue public class HostAvailabilityTask.. Main main this.main main protected Boolean doInBackground String... params Main.Log doInBackground isHostAvailable params.. protected Boolean doInBackground String... params Main.Log doInBackground isHostAvailable params 0 try return InetAddress.getByName params..
What are the best practices for SQLite on Android? http://stackoverflow.com/questions/2493331/what-are-the-best-practices-for-sqlite-on-android run inserts deletes and select queries from an AsyncTask's doInBackground Or should I use the UI Thread I suppose that db queries can..
Download a file with Android, and showing the progress in a ProgressDialog http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog context this.context context @Override protected String doInBackground String... sUrl take CPU lock to prevent CPU from going off if.. finally wl.release return null The method above doInBackground runs always on a background thread. You shouldn't do any UI.. com.groundy.sample.param.url @Override protected boolean doInBackground try String url getParameters .getString PARAM_URL File dest..
Make an HTTP request with android http://stackoverflow.com/questions/3505930/make-an-http-request-with-android AsyncTask String String String @Override protected String doInBackground String... uri HttpClient httpclient new DefaultHttpClient HttpResponse..
Background task, progress dialog, orientation change - is there any 100% working solution? http://stackoverflow.com/questions/3821423/background-task-progress-dialog-orientation-change-is-there-any-100-working Step #6 Do not refer to the activity data member from doInBackground . If you follow the above recipe it will all work. onProgressUpdate..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible extends AsyncTask String Void Void protected Void doInBackground String ... x while true System.out.println x 0 try Thread.sleep.. uses a thread pool pattern for running the stuff from doInBackground . The issue is initially in early Android OS versions the pool.. passed for execution already but have not finished their doInBackground yet. This is tested confirmed by me on 2.2. Suppose you have..
http://stackoverflow.com/questions/4538338/progressdialog-in-asynctask context Error Toast.LENGTH_LONG .show protected Boolean doInBackground final String... args try BaseFeedParser parser new BaseFeedParser..
http://stackoverflow.com/questions/9671546/asynctask-android-example AsyncTask String Void String @Override protected String doInBackground String... params for int i 0 i 5 i try Thread.sleep 1000.. is not good practice. The AsyncTask executes everything in doInBackground inside of another thread which does not have access to the GUI.. You will then see you TextView text update after the doInBackground completes. EDIT I noticed that your onClick listener does not..
android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException [duplicate] http://stackoverflow.com/questions/11204079/android-caused-by-android-view-viewrootimplcalledfromwrongthreadexception You are trying to update your Main UI Thread from doInBackGround as AsyncTask never allowed that. Never update your UI from doInBackGround.. as AsyncTask never allowed that. Never update your UI from doInBackGround of AsyncTask as its only worker thread. So write your Main UI..
ProgressBar in asynctask is not showing on upload http://stackoverflow.com/questions/15572747/progressbar-in-asynctask-is-not-showing-on-upload value in doInbackground recieve value in onPostExecute . doInBackGround runs in background so you cannot access or update ui here. To..
http://stackoverflow.com/questions/18289623/how-to-use-asynctask indicator and the type of the result the return type of doInBackGround . Here is an Example of an AsyncTask looking like this AsyncTask.. 0 the onPostexecute method receives the return type of doInBackGround protected void onPostExecute Long result do something with the..
How to use AsyncTask to show a ProgressDialog while doing background work in Android? [duplicate] http://stackoverflow.com/questions/3893626/how-to-use-asynctask-to-show-a-progressdialog-while-doing-background-work-in-and an inner class to extend AsyncTask as required here in the doInBackGround is where I call a static method which actually do the POST http..
knowing when map has stopped scrolling (like “moveend” in javascript API) http://stackoverflow.com/questions/4351748/knowing-when-map-has-stopped-scrolling-like-moveend-in-javascript-api and executes it. This task pauses for 100ms in its doInBackGround method before performing the server data fetch. When the listener..
Upload progress bar in android? http://stackoverflow.com/questions/5103377/upload-progress-bar-in-android share improve this question Put your upload code in the doInBackGround method of an AsyncTask . You can then publishProgress from there..
How to check internet access on Android? InetAddress never timeouts http://stackoverflow.com/questions/1560788/how-to-check-internet-access-on-android-inetaddress-never-timeouts InetAddress never timeouts I got a AsyncTask that is supposed to check the network access to a host name. But the doInBackground is never timed out. Anyone have a clue public class HostAvailabilityTask extends AsyncTask String Void Boolean private Main.. AsyncTask String Void Boolean private Main main public HostAvailabilityTask Main main this.main main protected Boolean doInBackground String... params Main.Log doInBackground isHostAvailable params 0 try return InetAddress.getByName params 0 .isReachable.. main public HostAvailabilityTask Main main this.main main protected Boolean doInBackground String... params Main.Log doInBackground isHostAvailable params 0 try return InetAddress.getByName params 0 .isReachable 30 catch UnknownHostException e e.printStackTrace..
What are the best practices for SQLite on Android? http://stackoverflow.com/questions/2493331/what-are-the-best-practices-for-sqlite-on-android queries on an SQLite db within an Android app Is it safe to run inserts deletes and select queries from an AsyncTask's doInBackground Or should I use the UI Thread I suppose that db queries can be heavy and should not use the UI thread as it can lock up..
Download a file with Android, and showing the progress in a ProgressDialog http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog String private Context context public DownloadTask Context context this.context context @Override protected String doInBackground String... sUrl take CPU lock to prevent CPU from going off if the user presses the power button during download PowerManager.. IOException ignored if connection null connection.disconnect finally wl.release return null The method above doInBackground runs always on a background thread. You shouldn't do any UI tasks there. On the other hand the onProgressUpdate and onPreExecute.. extends GroundyTask public static final String PARAM_URL com.groundy.sample.param.url @Override protected boolean doInBackground try String url getParameters .getString PARAM_URL File dest new File getContext .getFilesDir new File url .getName DownloadUtils.downloadFile..
Make an HTTP request with android http://stackoverflow.com/questions/3505930/make-an-http-request-with-android I'd recommend extending AsyncTask class RequestTask extends AsyncTask String String String @Override protected String doInBackground String... uri HttpClient httpclient new DefaultHttpClient HttpResponse response String responseString null try response..
Background task, progress dialog, orientation change - is there any 100% working solution? http://stackoverflow.com/questions/3821423/background-task-progress-dialog-orientation-change-is-there-any-100-working call your setter to associate your new activity with the task. Step #6 Do not refer to the activity data member from doInBackground . If you follow the above recipe it will all work. onProgressUpdate and onPostExecute are suspended between the start of..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible problem public class AndroidJunk extends Activity class PrinterTask extends AsyncTask String Void Void protected Void doInBackground String ... x while true System.out.println x 0 try Thread.sleep 1000 catch InterruptedException ie ie.printStackTrace .. android asynctask share improve this question AsyncTask uses a thread pool pattern for running the stuff from doInBackground . The issue is initially in early Android OS versions the pool size was just 1 meaning no parallel computations for a bunch.. running AsyncTasks depens on how many tasks have been passed for execution already but have not finished their doInBackground yet. This is tested confirmed by me on 2.2. Suppose you have a custom AsyncTask that just sleeps a second in doInBackground..
http://stackoverflow.com/questions/4538338/progressdialog-in-asynctask context OK Toast.LENGTH_LONG .show else Toast.makeText context Error Toast.LENGTH_LONG .show protected Boolean doInBackground final String... args try BaseFeedParser parser new BaseFeedParser messages parser.parse List Message titles new ArrayList..
http://stackoverflow.com/questions/9671546/asynctask-android-example LongOperation .execute private class LongOperation extends AsyncTask String Void String @Override protected String doInBackground String... params for int i 0 i 5 i try Thread.sleep 1000 catch InterruptedException e TODO Auto generated catch block.. to access the GUI via another thread. This in the main is not good practice. The AsyncTask executes everything in doInBackground inside of another thread which does not have access to the GUI where your views are. preExecute and postExecute offer you.. R.id.output txt.setText Executed put them in PostExecute You will then see you TextView text update after the doInBackground completes. EDIT I noticed that your onClick listener does not check to see which View has been selected. I find the easiest..
android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException [duplicate] http://stackoverflow.com/questions/11204079/android-caused-by-android-view-viewrootimplcalledfromwrongthreadexception url share improve this question Bad practice of use of AsyncTask You are trying to update your Main UI Thread from doInBackGround as AsyncTask never allowed that. Never update your UI from doInBackGround of AsyncTask as its only worker thread. So write.. trying to update your Main UI Thread from doInBackGround as AsyncTask never allowed that. Never update your UI from doInBackGround of AsyncTask as its only worker thread. So write your Main UI updatation code in onPostExecute method of AsyncTask.. @Override..
ProgressBar in asynctask is not showing on upload http://stackoverflow.com/questions/15572747/progressbar-in-asynctask-is-not-showing-on-upload and you have parameter file_url in onPostExecute . Return value in doInbackground recieve value in onPostExecute . doInBackGround runs in background so you cannot access or update ui here. To update ui you can use onPostExecute . Your AsyncTask should..
http://stackoverflow.com/questions/18289623/how-to-use-asynctask type of Parameter the AsyncTask takes the Type of the Progress indicator and the type of the result the return type of doInBackGround . Here is an Example of an AsyncTask looking like this AsyncTask String Integer Long We have type String for the Parameters.. Integer... progress setProgressPercent progress 0 the onPostexecute method receives the return type of doInBackGround protected void onPostExecute Long result do something with the result for example display the received Data in a ListView..
How to use AsyncTask to show a ProgressDialog while doing background work in Android? [duplicate] http://stackoverflow.com/questions/3893626/how-to-use-asynctask-to-show-a-progressdialog-while-doing-background-work-in-and ProgressDialog progressDialog ... 2 I have also written an inner class to extend AsyncTask as required here in the doInBackGround is where I call a static method which actually do the POST http request to the server in the server side I have blocked..
knowing when map has stopped scrolling (like “moveend” in javascript API) http://stackoverflow.com/questions/4351748/knowing-when-map-has-stopped-scrolling-like-moveend-in-javascript-api listener is an activity that instantiates a subclass of AsyncTask and executes it. This task pauses for 100ms in its doInBackGround method before performing the server data fetch. When the listener activity receives a second map move event which it will..
Upload progress bar in android? http://stackoverflow.com/questions/5103377/upload-progress-bar-in-android ioex return like 200 Ok Thanks . android android layout share improve this question Put your upload code in the doInBackGround method of an AsyncTask . You can then publishProgress from there and in onProgressUpdate update the ProgressBar. Have a..
ProgressBar in asynctask is not showing on upload http://stackoverflow.com/questions/15572747/progressbar-in-asynctask-is-not-showing-on-upload is executed. android android asynctask progress bar share improve this question Run on ui thread in asynctask doinbackground is not correct. Also you are returning null in doInBackground and you have parameter file_url in onPostExecute . Return..
How to raise a toast in AsyncTask, I am prompted to used the Looper http://stackoverflow.com/questions/2837676/how-to-raise-a-toast-in-asynctask-i-am-prompted-to-used-the-looper asynctask toast looper share improve this question onPostExecute executes on UI thread or publishProgress in your doinbackground and protected void onProgressUpdate Integer... progress http developer.android.com reference android os AsyncTask.html ..
Common class for AsyncTask in Android? http://stackoverflow.com/questions/3291490/common-class-for-asynctask-in-android I have a common class say for eg Class A which extends AsyncTask and has all the methods implemented i.e. onPreExecute doinbackground and onPostExecute . Now there are other classes which want to use Class A object. Say Class B uses class A in the below..
Need a simple tutorial for android/webservice work? http://stackoverflow.com/questions/7520243/need-a-simple-tutorial-for-android-webservice-work Always better to use async task for these purposes public class FetchList extends asyncTask Void Void Byte doinbackground this was explained in first step Response res new Response url String response res.getResponse XmlParser xml new XmlParser..
Finish the calling activity when AsyncTask completes http://stackoverflow.com/questions/8623823/finish-the-calling-activity-when-asynctask-completes class MyTask extends AsyncTask Void Void Void private Context mContext public MyTask Context context mContext context doinbackground etc protected void onPostExecute mContext.finish Other things are working as expected if I remove mContext.finish above... extends AsyncTask Void Void Void private TaskCallback mCallback public MyTask TaskCallback callback mCallback callback doinbackground etc protected void onPostExecute mCallback.done There you go it gives you more flexibility to custom each implementation...
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