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copied!<p>try with the distance it works for you I think: <a href="http://developer.android.com/reference/android/location/Location.html#distanceBetween%28double,%20double,%20double,%20double,%20float%5B%5D%29" rel="nofollow noreferrer">distanceBetween</a></p> <p>Yo can implement your listener with a Runnable:</p> <pre><code> private Handler handler = new Handler(); public static final int circleCheckingDelay = 1000; // in ms private Runnable circleChecker = new Runnable() { public void run() { float distance= getDistance(GeoPoint p1, GeoPoint p2); if(distance < ...) { //do something } handler.removeCallbacks(circleChecker); handler.postDelayed(circleChecker, circleCheckingDelay); } }; </code></pre> <p>Add the following functions in your mapActivity:</p> <p>OnResume:</p> <pre><code> handler.postDelayed(circleChecker, circleCheckingDelay); </code></pre> <p>OnPause:</p> <pre><code> handler.removeCallbacks(circleChecker); </code></pre> <p>Check this link too: <a href="https://stackoverflow.com/questions/5936912/how-to-find-the-distance-between-two-geopoints">how to find the distance between two geopoints?</a></p> <p>for example the function to get the distance:</p> <pre><code>public float getDistance(GeoPoint p1, GeoPoint p2) { double lat1 = ((double)p1.getLatitudeE6()) / 1e6; double lng1 = ((double)p1.getLongitudeE6()) / 1e6; double lat2 = ((double)p2.getLatitudeE6()) / 1e6; double lng2 = ((double)p2.getLongitudeE6()) / 1e6; float [] dist = new float[1]; Location.distanceBetween(lat1, lng1, lat2, lng2, dist); return dist[0]; } </code></pre>

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