android-asynctask

问题 I have simple Activity that calls AsyncTask , so I print some id's regarding Proces and Thread : From onCreate android.os.Process.myUid(): 10137 From onCreate android.os.Process.myPid(): 29776 From onCreate android.os.Process.myTid(): 29776 From onCreate Thread.currentThread().getId(): 1 /****************************************************************/ From Async doInBackground android.os.Process.myUid(): 10137 From Async doInBackground android.os.Process.myPid(): 29776 From Async

问题 I run two AsyncTask tasks in my Android application which are from the same class but with different parameters. For example: new myAsynckTask(a,b,c).execute(); new myAssyncTask(a,d,e).execute(); Do they execute in parallel or in a serial order? I ask this because when the first one starts, shows the progress of execution and when finishes I see the second one which needs more time to finish but I can't see the progress(I'm able to see the rectangle but the progress bar is not showing 20%.

问题 In an existing app I have an activity with an inner class which extends AsyncTask, this looks like the following: public class Activity_1 extends BaseActivity { .... new async().execute(); ... public class asyncextends AsyncTask<Void, Void, String> { protected String doInBackground(Void... progress) { ... } protected void onPreExecute() { ... } protected void onPostExecute(String result) { ... } } } Now, I need to call the same doInBackground-method from another activity, but the

问题 I have a problem and I am not sure how to approach it. An activity in my app has multiple AsyncTask s which access single SQLiteOpenHelper . I initialize and open the helper in onCreate() and I am closing it in onStop() . I also check if it has been initialized in onResume() . Since I have published my app I received number of errors with Null Exception in doInBackground where I try to access the DB helper. I know that this is happens because the DB is closed ( onStop() ) just before the

问题 I have a problem and I am not sure how to approach it. An activity in my app has multiple AsyncTask s which access single SQLiteOpenHelper . I initialize and open the helper in onCreate() and I am closing it in onStop() . I also check if it has been initialized in onResume() . Since I have published my app I received number of errors with Null Exception in doInBackground where I try to access the DB helper. I know that this is happens because the DB is closed ( onStop() ) just before the

问题 I want to be able to, using my android device, connect to a mySQL database, send in a parameter that will be used in an SQL-statement, and I want to get the result back and be able to present it. It sounds easy, but all tutorials and examples I can find suffer from: extremely overbuilt (10 classes minimum to make that perfect button) incredibly confusing (no comments, explanations and retarded variable names) dependent on classes that don't exist If I strip something unnecessary down

问题 I have a problem with Progress Bar showing % of download completed. I have a service class in which the downloading takes place. I can get the start time and end time of download from this class. In Main Activity on clicking a button I have to show the progress %. I heard that its possible through AsyncTask but I have no clue about how it works. Please help me with some sample code example related to this. Thanks 回答1: I would prefer AsyncTask for this. Here's an example ProgressDialog

问题 I have a problem with Progress Bar showing % of download completed. I have a service class in which the downloading takes place. I can get the start time and end time of download from this class. In Main Activity on clicking a button I have to show the progress %. I heard that its possible through AsyncTask but I have no clue about how it works. Please help me with some sample code example related to this. Thanks 回答1: I would prefer AsyncTask for this. Here's an example ProgressDialog

问题 I've tried following links but none of them helped to solve the issue. HttpPost returning error when using MultipartEntityBuilder in Android https://stackoverflow.com/a/22803149/1226882 Here's the code HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(Utility.AddProductWS); MultipartEntityBuilder multipartBuilder = MultipartEntityBuilder.create(); /* example for setting a HttpMultipartMode */ multipartBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); for

问题 I've tried following links but none of them helped to solve the issue. HttpPost returning error when using MultipartEntityBuilder in Android https://stackoverflow.com/a/22803149/1226882 Here's the code HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(Utility.AddProductWS); MultipartEntityBuilder multipartBuilder = MultipartEntityBuilder.create(); /* example for setting a HttpMultipartMode */ multipartBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); for