Learn how to handle toast on Android apps

I'm making an application on Android Studio, but what should I do if I want the toast to show "Stop processing" (remove processing while processing stops) and then change the toast to "Cancel processing" after the stop time?

I'm worried about what to do if it disappears after a few seconds of displaying it in the normal way of using toast.
I would like your advice.

ThreadSample.java

class ThreadSample extensions Thread {
    public void run() {

        try{
            Thread.sleep (10000L); // Stops threads for 10 seconds (10000ms)
        } catch(InterruptedExceptione) {

        }

    }
}

ThreadExecutor.java

class ThreadExecutor{
    public static void main(String[]args) {
        Threadt=new ThreadSample();
        t.start();
    }
}