Using service to show up toasts

Question

I am quite busy with a new application. However I created a service which calls a method like this:

MessageProcessor mp = new MessageProcessing(MessageService.this);
wa.setNewMessageBind(mp);

However since it's added into a service instead of an Activity this error shows up:

nl.giovanniterlingen.whatsapp.MessageService cannot be cast to android.app.Activity

And yes, I searched a lot on the internet, but still I couldn't find an answer that fits my need. Here is the MessageProcessing source:

((Activity) context).runOnUiThread(new Runnable() {
                public void run() {
                    Toast.makeText(
                            context,
                            msg.getFrom() + "(" + msg.getGroupId() + "): "
                                    + msg.getText(), Toast.LENGTH_SHORT)
                            .show();
                }
            });

When I replace the toast with system.out like this:

System.out.println(msg.getFrom() + "(" + msg.getGroupId()
                    + "): " + msg.getText());

Then it's working fine, but I want a toast so that's why I am asking.

For a more clearer view see my Github and the latest commits from 09-07-2015

https://github.com/gi097/WhatsApi-Android

@Sheychan see MessageService.java and MessageProcessing.java — , Jul 09 '15 at 08:34

score 1 · Answer 1 · edited May 23 '17 at 11:44

1

You can't cast your MessageService, which extends Service, to a Activity.

You need to access your UiThread from a Service. Check this question, maybe it'll help you: Accessing UI thread handler from a service

Handler handler = new Handler(Looper.getMainLooper());

handler.post(something_to_run_on_main_thread);

edited May 23 '17 at 11:44

Community

1
1

answered Jul 09 '15 at 08:50

B. Kemmer

1,517
1
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score 0 · Accepted Answer · answered Jul 09 '15 at 09:31

0

You can use

Handler handler = new Handler(Looper.getMainLooper());
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(context, "Your msg here" + msg.getText(), Toast.LENGTH_LONG);
                    }
                });

answered Jul 09 '15 at 09:31

architjn

1,397
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Even better! Thanks a lot :) – Jul 09 '15 at 11:05
actually the same i've written. :) – B. Kemmer Jul 09 '15 at 11:25

score -1 · Answer 3 · answered Jul 09 '15 at 08:42

private Toast myToast; // Declare as Field

myToast = Toast.makeText(this, "DummyMessage", Toast.LENGTH_LONG); // In onCreate(Bundle b)

myToast.setText("yourActualMessage");    // set msg Inside service or whatever

myToast.show();                    // Display in service or anywhere you want

Using service to show up toasts

3 Answers3