CODEWITHSUNDEEP
android-layoutandroidandroid-networking
hunterp
hunterp

Reputation: 15976

Gracefully handle IOException inside AsyncTask?

How to gracefully display a Toast when an IOException occurs inside the doInBackground of an AsyncTask?

Upvotes: 0

Views: 1212

Answers (3)

malliaridis
malliaridis

Reputation: 504

A dirty way is to create a different result in your IOException, for example if there is no internet connection you can check the connectivity in your IOException and set your result if connection exists to result='connection_to_server_issue' . If there is no connection result='no_connection'.

And later on on your postExecution you can check first your result if equals on of these two strings, and if so just execute a toastmessage, or whatever you want do do if one of these errors occurs.

Upvotes: 0

Dan S
Dan S

Reputation: 9189

Just like this:

Toast.makeText(Context context, int resId, int duration).show();

It needs a Context so just pass it along to the AsyncTask. More information.

Upvotes: 1

Rob
Rob

Reputation: 4753

You can override either onPostExecute or onProgressUpdate to display messages on the UI thread.

To use onProgressDisplay declare the second type as String when you extend AsyncTask:

private class YourTask extends AsyncTask<ParamType, String, ReturnType> {

and override onProgressUpdate:

protected void onProgressUpdate(String... progress) {
     String errMsg = progress[0];
     Toast.makeText(getApplicationContext(), errMsg, Toast.LENGTH_SHORT).show();
}

then you can call the "progress" function when your exception occurs in doInBackground:

protected ReturnType doInBackground(ParamType... params) {
     try {
         // do stuff
     } catch (IOException e) {
        publishProgress("My Error Msg goes here");
     }
     return result;
 }

Upvotes: 2

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