null pointer exception in GeoPoint on android

in my app i am storing latitude and longitude in a List as GeoPoint as follows:

List<Ge开发者_如何学CoPoint>geo;

here i convert latitude and longitude into GeoPoint and store in list.

GeoPoint tmp;

new GeoPoint((int) ( 9.909228086471558 * 1E6), (int) ( 78.10081958770752 * 1E6)); 
geo.add(tmp); // i get null pointer exception . Line no:42

Logcat

  05-30 18:33:25.203: ERROR/AndroidRuntime(6363): Caused by: java.lang.NullPointerException
  05-30 18:33:25.203: ERROR/AndroidRuntime(6363):     at net.learn2develop.GoogleMaps.main.onCreate(main.java:42)
  05-30 18:33:25.203: ERROR/AndroidRuntime(6363):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1132)
  05-30 18:33:25.203: ERROR/AndroidRuntime(6363):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231)

how to clear the null pointer exception. please help me.

// if you don't do this, it could cause your NPE
List<GeoPoint>geo = new ArrayList<GeoPoint>();

Also, this looks better this way:

GeoPoint tmp = new GeoPoint((int) ( 9.909228086471558 * 1E6), (int) ( 78.10081958770752 * 1E6)); 
geo.add(tmp);

Instead of using .iterator() this is recomended:

for(GeoPoint point : geo){
    // use the `point` object as you would in a interator
}