Show Toast if there is no Toast already showing

Question

I have several buttons that can be clicked on a fragment. After clicking each button I show a Toast message that is exactly the same for each button. Thus if you press 5 different buttons one after another you will layer up 5 toast messages which will end up showing the same message for a long time. What I want to do is show a Toast if there is no Toast currently running.

The method that I use to show the Toast message

public void showToastFromBackground(final String message) {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
            }
        });
    }

When a button is pressed I simply call showToastFromBackground("Text to show");.

What I actually want is something like

public void showToastFromBackground(final String message) {
    if(toastIsNotAlreadyRunning)
    {
        runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
        }
    });
    }       
}

that is what I want. Show the toast if there is no toast already running — Alan Ford, Apr 09 '15 at 17:31

Juanjo Vega · Accepted Answer · 2015-04-10T08:38:27.120

4

Use:

toast.getView().isShown();

Or:

if (toast == null || toast.getView().getWindowVisibility() != View.VISIBLE) {
    // Show a new toast...
}

EDIT:

Toast lastToast = null; // Class member variable

public void showToastFromBackground(final String message) {
    if(isToastNotRunning()) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                lastToast = Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG);
                lastToast.show();
            }
        });
    }       
}

boolean isToastNotRunning() {
    return (lastToast == null || lastToast.getView().getWindowVisibility() != View.VISIBLE);
}

edited Apr 10 '15 at 08:38

answered Apr 09 '15 at 17:37

Juanjo Vega

1,410
1
12
20

how do I access the toast object. it is running on a separate thread. – Alan Ford Apr 09 '15 at 17:38
You can store it in a class member variable i.e. `lastToast` – Juanjo Vega Apr 09 '15 at 17:41
I edited my answer. The code is not tested, but it might be a start. – Juanjo Vega Apr 09 '15 at 17:44

score 2 · Answer 2 · edited May 23 '17 at 11:44

Try isShown(). It returns a fatal error if no toast is shown. So you can use try and catch the error.

//"Toast toast" is declared in the class

 public void showAToast (String st){ 
        try{ 
            toast.getView().isShown();     // true if visible
            toast.setText(st);
        } catch (Exception e) {         // invisible if exception
            toast = Toast.makeText(theContext, st, toastDuration);
        }
        toast.show();  //finally display it
 }

From here.

This does not wait if there is toast already, then show. But it does change active toast's text and show new one immediately without toasts overlapping each other.

Show Toast if there is no Toast already showing

2 Answers2