Android Toast Error

Question

I am receiving a FATAL EXCEPTION: AsyncTask #1 error.

I have not created a Async Task I simply called the code below.

I am calling the following from a class that connects to the network:

Toast.makeText(context, "Connection Successful", Toast.LENGTH_LONG).show();

context has been passed through in the constructor from the MainActivity.

I am not sure what I am doing wrong here.

Could you post the code that the Toast command is in? Is it in an Activity, a service, a thread .... all this will help people answer you. You may not have created an AsyncTask, but what have you created? — Neil Townsend, Mar 26 '13 at 11:48
where you are trying to show Toast inside doInBackground? if yes then move it in onPostExecute method — ρяσѕρєя K, Mar 26 '13 at 11:50
write like this Toast.makeText(YourActivity.this, "xyz click", Toast.LENGTH_SHORT).show(); — Mr Nice, Mar 26 '13 at 11:51
It is not in an activity. Just a helper class. so i think that falls under a service. — Zapnologica, Mar 26 '13 at 11:54
calling this from my main activity class: ` netConnection = new Network(new Network.OnMessageReceived() { @Override // here the messageReceived method is implemented public void messageReceived(String message) { // this method calls the onProgressUpdate publishProgress(message); } }, getBaseContext());` — Zapnologica, Mar 26 '13 at 12:12
pass activity context to your helper class and the use the activity context to display toast — Raghunandan, Mar 26 '13 at 12:16
see this [link](http://stackoverflow.com/questions/11964951/how-to-show-toast-mesage-in-not-extend-activity-class) if it helps — Shiv, Mar 26 '13 at 12:30

score 5 · Accepted Answer · answered Mar 26 '13 at 12:31

make following changes for showing Toast from Network class(non Activity class) :

Step:1 Pass Activity Context to Network class instead of getBaseContext() :

netConnection = new Network(new Network.OnMessageReceived() { 
            @Override 
            // here the messageReceived method is implemented 
           public void messageReceived(String message) { 
                 // this method calls the onProgressUpdate 
                 publishProgress(message); 
           } 
     },Your_Current_Activity_Name.this);

Step 2: use runOnUiThread for showing Toast from Network class :

 public boolean connect() {
 //....your code..
 Activity activity = (Activity) context;
 activity.runOnUiThread(new Runnable() {
    public void run() {
        //show your Toast here..
       Toast.makeText(context,"Connection Successful", Toast.LENGTH_LONG).show();
    }
});
 //....your code..
}

Great answer! I use this to display a Toast from an AsyncTask. — MoRe, Jan 24 '14 at 02:48

score 1 · Answer 2 · edited May 23 '17 at 12:21

1

What a strange answers here :)

First guy want you to extend Network class from Activity, second tells you that you have not got Android SDK :)

You just need to send correct Context object to your Network object, you need to send Context object from getBaseContext() method, because this context object is correct for Toast messages (here you can read explanation about that).

edited May 23 '17 at 12:21

Community

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answered Mar 26 '13 at 12:17

Artem Zinnatullin

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score 0 · Answer 3 · answered Mar 26 '13 at 11:47

0

Toast.makeText(getApplicationContext(), "Connection Successful", Toast.LENGTH_LONG).show()

answered Mar 26 '13 at 11:47

Nirav Ranpara

13,753
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getApplicationContext() does not work, eclipse says create the method. – Zapnologica Mar 26 '13 at 11:53
Android SDk is installed and all other aspects of the app work correctly. Does getApplicationContext() not only work if the class extends activity? – Zapnologica Mar 26 '13 at 11:58

Bigflow · Answer 4 · 2013-03-26T12:11:40.147

0

Change:

Toast.makeText(context, "Connection Successful", Toast.LENGTH_LONG).show();

to

Toast.makeText(getBaseContext(), "Connection Successful", Toast.LENGTH_LONG).show();

edited Mar 26 '13 at 12:11

answered Mar 26 '13 at 11:51

Bigflow

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getBaseContext() does not work, it says create method 'getbaseContext' – Zapnologica Mar 26 '13 at 11:53
@user1331971 Can you change `public class Network` to `public class Network extends Activity`? – Bigflow Mar 26 '13 at 12:04
@user1331971 Then you can use mine, or Nirav's solution – Bigflow Mar 26 '13 at 12:04
@user1331971: You have to extend Activity – Nirav Ranpara Mar 26 '13 at 12:07
How will that affect the functionality of the class? This class is not intended to be an activity, the main activity calls the network class. i just want this class to say connected or connection failed when called. So it must display the toast on the activity that called it. – Zapnologica Mar 26 '13 at 12:09
@user1331971 Only 1 way to find out isn't it :p – Bigflow Mar 26 '13 at 12:09
@user1331971 : after investigating your class i think u are trying to show Toast from background Thread ? then u will need to use runOnUiThread for showing Toast – ρяσѕρєя K Mar 26 '13 at 12:12

Android Toast Error

4 Answers4