@Override
protected void onSaveInstanceState(Bundle outState) {
      cPoint = mapView.getMapCenter(); //得到当前MapView的中心点。
      outState.putInt("lat", cPoint.getLatitudeE6()); //暂存在outState中
      outState.putInt("lon", cPoint.getLongitudeE6());
      super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
      int lat = savedInstanceState.getInt("lat"); //从保存的数据中恢复
      int lon = savedInstanceState.getInt("lon");
      cPoint = new GeoPoint(lat, lon);
      super.onRestoreInstanceState(savedInstanceState);
}

--转自