Delete threaded Toast message

Question

I'm trying to "remove" a Toast when switching from a tab to another one, so assuming pausing the focused tab activity. Basically I could apply the cancel method to a single Toast object, or assign it to null. This works.

The point is when I use TextView and thread the Toast, then the Toast is still visible even if I stop the thread. I started from this point to thread the Toast and trying to stop it according to this one.

How to stop the thread and remove the toast from the system queue, or is there any better solution to achieve that goal (eg multiple toasts in a single activity, stopping showing toasts when swapping from an activity to another one) ?

Calling a Toast (this is Ok):

private void showSingleToast(String toastText, int color, long duration_ms) {


    if (mySingleToast instanceof Toast) {
        mySingleToast.setText(toastText);

        if (null != toastView)
            if (toastView instanceof TextView)
                toastView.setTextColor(color);

        ToastExpander.showFor(mySingleToast, duration_ms);
    }
}

Threading the Toast.show()

public class ToastExpander extends Thread {

    public static final String TAG = "ToastExpander";

    static Thread t;// = null;

    // Must be volatile:
    static volatile boolean stopFlag = false;
    static long scan_freq = 300;

    public static void showFor(final Toast aToast, final long durationInMilliseconds) {

        aToast.setDuration(Toast.LENGTH_SHORT);

        t = new Thread() {
            long timeElapsed = 0l;

            public void run() {
                try {
                    while (timeElapsed <= durationInMilliseconds || !stopFlag) {
                        long start = System.currentTimeMillis();
                        aToast.show();
                        sleep(scan_freq);
                        timeElapsed += System.currentTimeMillis() - start;
                    }

                    // doesn't work: aToast.cancel();

                } catch (InterruptedException e) {
                    Log.e(TAG, e.toString());
                }
            } /* end of "run" */

        }; /* end of Thread */

        t.start();



    } /* end showFor */

    public static void cancel() {
    stopFlag = true;
    }
}

Trying to "remove" the Toast (does not work)

private void hideSingleToast() {
    //hideTextView(toastView);
    toastView = null;
    ToastExpander.cancel();
    mySingleToast.cancel();
    //mySingleToast= null;


}

nandeesh · Answer 1 · 2012-09-17T19:55:25.557

1

Toast show and dismiss are done using a handler. So the thread which creates the toast should be running till the toast is dismissed, so that handler can process dismiss message. So create the Toast in UI thread.

Make sure mySingleToast is created in Ui thread

Edit: Since you are creating the toast in Ui thread, looks like, in your case too many atoast.show() are queued up. LENGTH_SHORT usually shows up for 2 seconds. And in that duration you have added almost 6-7 shows. That is why it continues to be shown.

What you could do is add aToast.cancel() just before aToast.show too.

edited Sep 17 '12 at 19:55

answered Sep 17 '12 at 17:32

nandeesh

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I confirm that mySingleToast is created in onCreate. – hornetbzz Sep 17 '12 at 19:39

score 0 · Accepted Answer · answered Sep 18 '12 at 10:01

Here is the working solution for me.

public static void show(final Toast aToast, final String usr_msg, final long durationInMilliseconds,
            final TextView myView, final int myColor) {

    // Instanciate Toast
    aToast.setText(usr_msg);
    aToast.setDuration(Toast.LENGTH_SHORT);

    // Instanciate TV
    myView.setTextColor(myColor);

    t = new Thread() {
        long timeElapsed = 0l;

        public void run() {

            try {

                // Make sure view exists

                // Show Toast in the view
                while (!stopFlag) {
                    long start = System.currentTimeMillis();
                    aToast.show();
                    sleep(scan_freq);
                    timeElapsed += System.currentTimeMillis() - start;

                    // DEBUG
                    if (debug)
                        Log.e(TAG, "|__ Thread running since : " + timeElapsed + " ms");

                    if (timeElapsed >= durationInMilliseconds) {
                        stopFlag = true;
                        if (debug)
                            Log.e(TAG, "|__ Time elapsed - Process stopped");
                    }

                }




            } catch (InterruptedException e) {
                Log.e(TAG, "Catch : " + e.toString());
            }
        } /* end of "run" */

    }; /* end of Thread */

    t.start();

    // reset stopFlag for next Toast
    stopFlag = false;

} /* end showFor */

Delete threaded Toast message

2 Answers2