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POWhat is the lifecycle of an Activity?
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  1. POWhat is the lifecycle of an Activity?
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    copied!<p>I am not so clear on how the program in working in Android. I started working on Android for last two months and also I am a beginner in Java. So, I am trying my best to develop and learn. Here is the piece of code I implemented and I am not so clear how it works as per my requirement.</p> <pre><code> activity{ onCreate(){ /* here i am using google maps api and trying to plot the current location*/ OverlayItem overlayItem1 = new OverlayItem(ourLocation,"Our Location","Position"); CustomPinpoint custom1 = new CustomPinpoint(d, Activity.this); custom1.insertPinpoint(overlayItem1); overlayList.add(custom1); controller.animateTo(ourLocation); } private class TouchOverlay extends com.google.android.maps.Overlay{ public boolean onTouchEvent(MotionEvent event, MapView map){ onZoom(); } } public boolean onCreateOptionsMenu(Menu menu){} public boolean onOptionsItemSelected(MenuItem item){ case.X: getGPSPoints();//Here i will be getting some gps points from stored database // and I would like to plot them all on the map. TouchOverlay touchOverlay = new TouchOverlay(); overlayList.add(touchOverlay); } onPause(){ super.onPause(); lm.removeUpdates(this); } onResume(){ super.onResume(); lm.requestLocationUpdates(towers, 500, (float) 0.5, this); } onLocationChanged(Location l) { // TODO Auto-generated method stub clearmap(); lat = (int) (l.getLatitude()*1E6); longi = (int) (l.getLongitude()*1E6); GeoPoint ourLocation = new GeoPoint(lat, longi); CustomPinpoint custom = new CustomPinpoint(d, TrafficMapActivity.this); OverlayItem overlayItem = new OverlayItem(ourLocation,"Our location","Position"); custom.insertPinpoint(overlayItem); overlayList.add(custom); } } </code></pre> <p>My question is when will <code>onLocationChanged</code> method be called and also onTouchEvent method?</p> <p>I have created a method to <code>getGPSPoints()</code> and I would like to plot the obtained points on the map. What my intention is its like google maps traffic layer. I should be continuously drawing when we drag the screen or for zoom in/out. For this I am using the same <code>getGPSPoints</code> method inside <code>onZoom()</code> method in <code>TouchOverlay</code> class.</p> <p>But it is just drawing once when I first selected the option and for the first zoom in/out operation. If I need to draw the remaining I have to click again on the option as per the current implementation. How does this activity works and I should have it?</p>
 

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