Show Toast on ScanContiniously

Show Toast on ScanContiniously

By : Tone G
Date : November 22 2020, 02:42 PM
Hope this helps I'm using mvvmcross and I've implemented the ScanContiniously method from ZXing and it works perfectly. What i want now is to let the user know what code was read by showing a toast on the screen, otherwise it wont be sure if that code scan was succesfull. This is what im trying but it just wont show anything on the screen: , you need to be sure your Toast is executing on the UI thread:
code :
RunOnUiThread(() => {
  Toast.MakeText(Application.Context, mensaje, ToastLength.Short).Show();

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WP7: How to show a toast?

WP7: How to show a toast?

By : Vũ Văn Tường
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can show ShellToast only from Background Agent. If you trying to show it from foreground app, use Coding4Fun ToastPrompt control for this
Can I cancel previous Toast when I want to show an other Toast?

Can I cancel previous Toast when I want to show an other Toast?

By : sumant hegade
Date : March 29 2020, 07:55 AM
this one helps. In my app, I construct a calendar widget for my activity, when I scroll it to previous or next month, I let it make a toast and show it. , You need to call method on correct object.
code :
Show Toast if there is no Toast already showing

Show Toast if there is no Toast already showing

By : user3456725
Date : March 29 2020, 07:55 AM
it helps some times 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. , Use:
code :
if (toast == null || toast.getView().getWindowVisibility() != View.VISIBLE) {
    // Show a new toast...
Toast lastToast = null; // Class member variable

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

boolean isToastNotRunning() {
    return (lastToast == null || lastToast.getView().getWindowVisibility() != View.VISIBLE);
Android toast show() method does not show again the same toast

Android toast show() method does not show again the same toast

By : Lon
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Since Android 7.1.1 each non-system package can only queue one Toast at a time. See the commit:
Materialize.toast show a toast only once

Materialize.toast show a toast only once

By : Volodymyr Bobko
Date : March 29 2020, 07:55 AM
wish help you to fix your issue There are different ways to achieve this.
The first that comes to mind is the following. let's say you have a function that triggers your toast. Once the toast is triggered, set a global flag (something like toastCurrentlyDisplayed = true) and prevent that function from opening the toast again if the flag is set to true. I.e.:
code :
myFunction() {
  if (!toastCurrentlyDisplayed) {
    //Logic to open your toast here
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