Three Activities, when one starts, how to close the parent

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Android

I have three activities A, B, C. A is my menu, upon button click it starts Activity B, in activity B, based on the outcome of an if statement Activity C is started.

The problem is C runs, the processes can be see in the logcat but doesn't open. B continues to play the alarm and vibrate and then the phone stalls and the alarm and vibrate continue. I have the code for the if statement above and the code for the openMaps() function as well, this is called based on the outcome of the if, in which I try to open Activity C and close B

EDIT

I have changed my code somewhat, ok, I have an idea what the problem is, I just don't know how to solve it. I have a thread, inside that thread is an infinate while loop, inside this infinite while loop I check the distance between two coordinates (i want them constantly updating).

The problem is, variables I have declared globally are initialized within the loop so I have to run my if statement within that, to access those...I tried using a boolean 'test' that if it's true execute the if statement then set test to false but that doesn't work I'm afraid.

Thread dist = new Thread(new Runnable() {
            public void run() {

                while (true) {

                    child = new Location("point A");

                    child.setLatitude(Clatitude);
                    child.setLongitude(Clongitude);

                    parent = new Location("point B");

                    parent.setLatitude(Platitude);
                    parent.setLongitude(Plongitude);

                    distance = child.distanceTo(parent);

                    // DisRound = Math.round(distance * 100.0) / 100.0;
                    DisRound = 550;

                    dynamicActivation = DisRound * weight;

                    try {
                        Thread.sleep(1000);

                        if (test)
                        {
                            if(dynamicActivation > threshold)
                            {
                                finish();
                                new Timer().schedule(new MapsTimer(), 5000);
                                test = false;
                            }
                            Log.d("ACTIVATION", Boolean.toString(test));
                        }
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        });
        dist.start();

Here is the code for my MapsTimer that i'm calling in the if statement

private class MapsTimer extends TimerTask {
		@Override
		public void run() {
			runOnUiThread(new Runnable() {

				public void run() {
					int duration = Toast.LENGTH_SHORT;
					CharSequence text = "YOUR CHILD HAS TRAVELLED OUTSIDE PROXIMITY";
					Context context = getApplicationContext();
					proximityAlert = Toast.makeText(context, text, duration);
					proximityAlert.show();
					alarmSound.start();									
					
					openMaps();
				}
			});
		}

So, distance, DisRound and dynamicActivation are all global but initialized in the infinite loop, if I can access these outside this loop, I'm sure I can stop the problem. Anyone have any thoughts?


Regards,
Gary