android-asynctask

问题 The application conduction api calls in every 10seconds with the gps location from the network provider. And also there are several api calls can be do by the user. application is crashing with law internet or less internet connection(device data access) is there a proper way to prevent app crashing and hold the api request till the internet network available. here im posting my crash reprort stacktrace java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@4206a5b0

问题 try { Get_Webpage obj = new Get_Webpage(url); directory_listings = obj.get_webpage_source(); } catch (Exception e) { finish(); m_ProgressDialog.dismiss(); Toast.makeText(this, "You have to be connected to the internet for this application to work", Toast.LENGTH_LONG).show(); } 02-28 22:23:21.055: E/AndroidRuntime(2170): FATAL EXCEPTION: AsyncTask #1 02-28 22:23:21.055: E/AndroidRuntime(2170): java.lang.RuntimeException: An error occured while executing doInBackground() 02-28 22:23:21.055: E

问题 try { Get_Webpage obj = new Get_Webpage(url); directory_listings = obj.get_webpage_source(); } catch (Exception e) { finish(); m_ProgressDialog.dismiss(); Toast.makeText(this, "You have to be connected to the internet for this application to work", Toast.LENGTH_LONG).show(); } 02-28 22:23:21.055: E/AndroidRuntime(2170): FATAL EXCEPTION: AsyncTask #1 02-28 22:23:21.055: E/AndroidRuntime(2170): java.lang.RuntimeException: An error occured while executing doInBackground() 02-28 22:23:21.055: E

问题 when I read document about asyntask , they say that: "should not" update UI thread in doInbackground because doInbackground work on different thread. that means : this action will dangerous because UI Thread isn't thread-safe. I understand it. but when I try for test what happen when I update UI Thread in this function. I receive error: (but error doesn't not look like because aysnchonize , but because we CANNOT do it) (TextView)((Activity)context).findViewById(R.id.text)).setText(

问题 Is there any difference between AsyncSync being fired up from Activity or IntentService? I'm building an app which downloads and uploads files via http. I use custom notification layout with progress bar for each transfer. I choose between doing transfers in parallel or putting them into queue (which option would you recommend?). For the option with queue I use an IntentService, so Android framework takes care of putting tasks into a queue for me. For having them in parallel I use AsyncTasks.

问题 I am streaming a radio Stream. I want to generate a notification when the song in the stream changes. I am using streamscraper (http://code.google.com/p/streamscraper) to get the metadata of the current stream, and I try to generate a notification when the metadata changes. Here is the Async Task that I created to implement this. public class updateMetadata extends AsyncTask<String, Void, PlaylistSong<BaseArtist, BaseAlbum>> { private static final String TAG = updateMetadata.class

问题 I have 3 Tabs like in the android development tutorial Now what I want to do is very simple I use Fragments on each page. I want to show different content from a rss feed on each page. The problem is when I go to the next tab it runs AsyncTask (which is in onCreateView) of the previous Fragment. So you start on Page 1 it loads the content fine. Then when you go to Page 2 is runs the onCreateView of the Fragment of Page 1 again. And obviously gives an NullException. The point is it should not

问题 I currently use Loaders to grab data from my ContentProvider (to enable auto-updating of my Cursors). This approach is straight-forward for Querying the database, though, it seems ill suited for any other DB operation (such as Insert, Update, Delete). My questions are: Do all SQLite operations need to be on a background thread, or is it safe to do simple operations like Inserting, Updating, or Deleting a single row on the UI thread? What is a nice design patter to ensure all queries go

问题 I have an ArrayList of Car : ArrayList<Car> cars = new ArrayList<Car>(); that I fill on my onCreate method of my MainActivity.java with an AsyncTask: new fillCars().execute(); What I want it's to use this ArrayList cars in other class, named ModifyCars.java . My problem it's that after the AsyncTask it's executed on the method onCreate , in all the class MainActivity.java the ArrayList cars it's fill and I can use the data inside of it but when I pass it to ModifyCars.java the size it's

问题 so I am making an application to get current position. The code below is working fine String stringAddress = ""; public void getLocation(View view){ final LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE); Criteria kriteria = new Criteria(); kriteria.setAccuracy(Criteria.ACCURACY_FINE); kriteria.setAltitudeRequired(false); kriteria.setBearingRequired(false); kriteria.setCostAllowed(true); kriteria.setPowerRequirement(Criteria.POWER_LOW); final String provider = lm