android-asynctask

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

问题 I have been reading through a lot of answers of questions that are similar to mine, but still having problem fixing my issue. I have a project that is an RSS Reader that loads in images in the background with an AsyncTask class. The program works, except if the user scrolls quickly then the images sometimes do not load in my rows. They never load in the incorrect spot, it just seems like they are skipped if the user scrolls quickly. Also, on start-up, only 2 or 1 of the images in my listview

问题 I have a list of url of images at remote server. I need to load them into Grid View asynchronously without using any third party libraries . I have built the following task: class BitmapWorkerTask extends AsyncTask<String, Void, Bitmap> { private final WeakReference<ImageView> imageViewReference; public BitmapWorkerTask(ImageView imageView) { // Use a WeakReference to ensure the ImageView can be garbage collected imageViewReference = new WeakReference<ImageView>(imageView); } // Decode image

问题 Currently I'm picking a file from the gallery and copying it to a specified folder. While copying I'm showing a ProgressDialog , I'm doing this with AsyncTask . I'm trying to show the progress of the file being copied with percentage, but the problem I have is that the progress shows 50% and stay at 50% until the file is done copying. There is a lot of questions about this, but all of them are related to downloading from URL . My Question How can I get the current progress of the file being

问题 The user can add any number of downloads, but download will start one after another i.e. next download will start only after the completion of present download. The user will navigate away from the activity showing download progress in order to add new downloads, and when new file to be downloaded is added, the application navigates back to the activity showing download progress, where it will show the progress of the download, previously added, and keep the presently added file as pending

问题 In my application, I download a file using an HttpURLConnection in an AsyncTask. If the file takes too long to download, then I want cancel it; and I do this by closing the stream and calling disconnect() on the HttpURLConnection object. The code has worked flawlessly for years in Android. However, now that KitKat is out, issues have popped up. Specifically, the disconnect() call itself takes several seconds or more to complete. In pre-KitKat devices, it took a millisecond or less. What is

问题 I am working on my First Android application where we have our own REST API, url will be like. "www.abc.com/abc/def/" . For login activity i need to do httppost by passing 3 parameters as identifier, email and password. Then after getting the http response, i need to show the dialogbox whether Invalid Credentials or Switch to another activity. Can someone please show me sample code for how to do this? 回答1: An easy way to complete this task is to using a library, if your familiar with

问题 The following were supposed to be the same if I am not mistaking. Using AsyncTask : private class GetDataTask extends AsyncTask<String, Void, String>{ @Override protected void onPreExecute() { } @Override protected String doInBackground(String... params) { return NetConnection.getRecordData(mUserId, mUserPassword); } @Override protected void onPostExecute(String result) { parseJson(result); } } Using a Thread : new Thread( new Runnable() { @Override public void run() { String res =

问题 This question already has answers here : Best practice: AsyncTask during orientation change (9 answers) Closed 4 years ago . Use case: The user start the app that will load a captcha. The user fill the captcha and try to download some information. Problem: If the user rotate the device while downloading the Activity is destroyed. At the end of the execution the AsyncTask is trying to update the destroyed Activity and the result is a "View not attached to window manager". "Wrong" solution: I

问题 I have a simple android widget that I want to update with an image from the internet. I can display static images on the widget no problem. I am told that you need to use an async task for this and I don't have much experience with these. Here is my widget: @Override public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { super.onUpdate(context, appWidgetManager, appWidgetIds); for (int i = 0; i < appWidgetIds.length; i++){ int appWidgetId = appWidgetIds