How do I change the rate or period of a repeating task using ScheduledExecutorService?

Vote count:

0

I have a modified version of the bluetooth chat sample app. I have set up a ScheduledExecutorService which sends a command over bluetooth at a predefined rate using scheduleAtFixedRate.

I have set up a PreferenceActivity to allow the period to be modified by the user. But I'm unsure how to get the actual recurring tasks to happen with the updated period. Do I need to cancel and restart the ScheduledExecutorService somehow?

Here's the relevant parts of my code.

private ScheduledExecutorService scheduleTaskExecutor;

public long ReadInterval = 1;

...    

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        scheduleTaskExecutor = Executors.newScheduledThreadPool(5);
...
    // This schedule a task to run every 1 second:
    scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
      public void run() {


        // If you need update UI, simply do this:
         runOnUiThread(new Runnable() {
            public void run() {
            // update your UI component here.
              if (connected == true) {
                  sendMessage("READ");                
                  if (D) Log.i(TAG, "In Run!");                   
              }
            }
        });
      }
    }, 0, ReadInterval, TimeUnit.SECONDS);      
    }

And I was trying to update ReadInterval here. The ReadInterval is getting updated but the recurring command period does not get updated.

    @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (D)
        Log.d(TAG, "onActivityResult " + resultCode);
    switch (requestCode) {
    case REQUEST_CONNECT_DEVICE:
...
    case REQUEST_ENABLE_BT:
...
    case REQUEST_SETTINGS:
        // When returning from settings activity
        SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
        String Pref = sharedPref.getString(SettingsActivity.KEY_PREF_READINTERVAL, "");
        ReadInterval = Long.valueOf(Pref);
        Toast.makeText(this, Pref,
                    Toast.LENGTH_SHORT).show();

        Log.d(TAG, "Settings Activity Result");
    }
}

asked 1 min ago

greencardigan

1

How do I change the rate or period of a repeating task using ScheduledExecutorService?