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Android AsyncTask Activity Crash RSS Reader


Android AsyncTask Activity Crash RSS Reader

By : user2949716
Date : November 17 2020, 04:28 AM
help you fix your problem I'm trying to build an RSS reader and put the rss feed fetch as ansyctask, that returns a feed in list view, or returns a text view saying "no internet connection" but the app still crashes, I don't know what's wrong, can you help please. , Here is the code:
code :
private class rssfeedget extends AsyncTask<String, Void, List<RSSItem>> {
    private List<RSSItem> result;

    protected void onPreExecute() {

    }

    @Override
    protected List<RSSItem> doInBackground(String... params) {
        FeedSource f = new HttpFeedSource();
        if(f.getFeed()==null)
            return null;
        else {
            this.result = f.getFeed(); // Execute getFeed in doInBackground
            return result;
        }
    }

    @Override
    protected void onPostExecute(List<RSSItem> result){


        if(doInBackground()==null){
            TextView tv= (TextView) findViewById(R.id.textView2);
            tv.setText("No internet Connection...");

        }
        else{
            ListView rssItemList = (ListView) findViewById(R.id.rssListview);
            rssItemList.setVerticalFadingEdgeEnabled(true);
            RSSItemAdapter adapter = new RSSItemAdapter(getApplicationContext(), R.layout.rssitem, this.result);
            rssItemList.setAdapter(adapter);
        }

    }
}


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Android AsyncTask: Adding views to an activity inside an AsyncTask?

Android AsyncTask: Adding views to an activity inside an AsyncTask?


By : Umer Baig
Date : March 29 2020, 07:55 AM
this will help yes off course, either pass the view or pass the Activity containing the view to the constructor of the AsyncTask. Just make sure you don't use those objects in the doInBackground method.
In fact I have done something similar just last week:
code :
@Override
protected void onPostExecute(Article[] articles) {
    ArrayAdapter<Article> arrayAdapter = new ArticleAdapter(context, articles);
    listView.setAdapter(arrayAdapter);
    listView.setVisibility(View.VISIBLE);
    progressBar.setVisibility(View.GONE);
}
QR reader crash when using asynctask

QR reader crash when using asynctask


By : Ghulam Mustafa
Date : March 29 2020, 07:55 AM
will be helpful for those in need You don't need any background thread at all. Neither an Async Task Nor a Thread. Threads are meant for long running operations that might block UI Thread, Like running queries with database or http requests.
In your case you are launching a new activity for result so even if your log is giving you "this application may be doing too much work on its main thread" then its a greater chance that the next activity you started is doing something on the Main UI Thread, not your mainactivity. Even if you are convinced to apply Async Task you are probably doing it in the wrong activity.This is because after launching the new Intent the current activity will go into onPause() and the main UI Thread will now be for the scanning activity.
Android - AsyncTask class in Activity class. Context crash the app

Android - AsyncTask class in Activity class. Context crash the app


By : mrosa
Date : March 29 2020, 07:55 AM
like below fixes the issue I'm creating AsyncTask class in Activity class. I need to get the Context in AsyncTask to build AlertDialog. I'm using constructor to point the context. My code: , OK. I know what is going on. I found this on stack overflow:
Android Activity Crash when Using Achartengine + Asynctask

Android Activity Crash when Using Achartengine + Asynctask


By : Rahul Kukreja
Date : March 29 2020, 07:55 AM
like below fixes the issue You're accessing the mMonth array in OpenChart() but you only initialize it in your async task onPostExecute() which takes place much later.
Either initialize mMonth with reasonable defaults, skip the parts where you need mMonth or postpone the OpenChart() altogether until the data is available.
Recyclerview working correctly on activity while AsyncTask return null value when using Fragment and crash

Recyclerview working correctly on activity while AsyncTask return null value when using Fragment and crash


By : cbtopher
Date : March 29 2020, 07:55 AM
With these it helps all of the following code were working correctly on an activity, but after trying to use a Fragment, the debugger presents that it tries to invoke Fragments at first, then try to execute the AsyncTask class uncorrectly, which crashes and didn't get the input Stream value from the API . i searched different articles related to my problem, but i would like to take an advice here if u please, here is my code as follows : , I was missing the Internet Permission in my Manifest, just add :
code :
<uses-permission android:name="android.permission.INTERNET" />
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