Question

I am scheduling a simple task that should update a text field in 4 seconds.

However everytime this is called the activity pauses and does not show the value in the text field until I restart the activity.

 private void showDelayedValue() {

    Runnable longRunningTask = new Runnable() {
        public void run() {

        int randomVal = randomNumberGenerator.nextInt(30 - -10) - 10; //random number between -10 and 30
        String randomValStr = Integer.toString(randomVal);

            Log.i(this.getClass().getSimpleName(),
                "FIRED startScheduler: " + randomValStr);

        theFieldOnScreenTV.setText(randomTempStr);

        }
    };
    //show the value in 2 seconds
    scheduledTaskExecutor.schedule(longRunningTask, 4, TimeUnit.SECONDS);

    }

The log shows:

FIRED startScheduler: 4

but does not update the TextView theFieldOnScreenTV

Instead onPause is called right after Fired startScheduler: is displayed in LogCat.

Many thanks!

EDIT:

This worked for me following Alex’ approach:

private void showDelayedValue() {
    int randomX = randomNumberGenerator.nextInt(30 - -10) - 10; 
    final String randomXStr = Integer.toString(randomX);
    final Runnable updateFieldR = new Runnable() {
        public void run() {
        theFieldOnScreenTV.setText(randomXStr);
        }
    };

    Runnable longRunningTask = new Runnable() {
        public void run() {
        theFieldOnScreenTV.post(updateFieldR);

        }
    };
    scheduledTaskExecutor.schedule(longRunningTask, 4, TimeUnit.SECONDS);

    }

Answer 1

instead of

theFieldOnScreenTV.setText(randomTempStr); 

try

theFieldOnScreenTV.post(new Runnable() { theFieldOnScreenTV.setText(randomTempStr); } );