There are a few ways to do this, but perhaps the easiest is just to check a flag in a SharedPreferences object and set it once the alert is shown.
SharedPreferences
Something like
public class MyActivity extends Activity {
public static final String PREFS_NAME = "MyPrefsFile";
@Override
protected void onCreate(Bundle state){
super.onCreate(state);
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean dialogShown = settings.getBoolean("dialogShown", false);
if (!dialogShown) {
// AlertDialog code here
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("dialogShown", true);
editor.commit();
}
}
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