Simulator:no error
Android: crash with null point exception
iOS: crash with null pointer exception
re-using a mapobject causes a null pointer exception. in the code below
onRefresh() and onList() are dummy functions that simply change the icon of
a map marker based upon user selection. calling mo.point.setIcon(image1);
results in the error because point is null;
Full code with most everything removed just enough to show the error
package com.howudodat.test.ui;
import com.codename1.googlemaps.MapContainer;
import com.codename1.googlemaps.MapContainer.MapObject;
import com.codename1.location.Location;
import com.codename1.location.LocationListener;
import com.codename1.location.LocationManager;
import com.codename1.maps.Coord;
import com.codename1.maps.MapListener;
import com.codename1.ui.Command;
import com.codename1.ui.Component;
import com.codename1.ui.Display;
import com.codename1.ui.EncodedImage;
import com.codename1.ui.FontImage;
import com.codename1.ui.Image;
import com.codename1.ui.Toolbar;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import com.codename1.ui.layouts.BorderLayout;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
public class FrmMap extends com.codename1.ui.Form {
protected MapContainer cnt = new MapContainer();
protected MapObject mo = null;
protected Image image0 = FontImage.createMaterial(FontImage.MATERIAL_HOME,
UIManager.getInstance().getComponentStyle("Command"), 5);
protected Image image1 =
FontImage.createMaterial(FontImage.MATERIAL_REFRESH,
UIManager.getInstance().getComponentStyle("Command"), 5);
protected Image image2 = FontImage.createMaterial(FontImage.MATERIAL_LIST,
UIManager.getInstance().getComponentStyle("Command"), 5);
public FrmMap() {
this(Resources.getGlobalResources());
}
public FrmMap(Resources resourceObjectInstance) {
initManualComponents();
Display.getInstance().callSerially(() -> {
centerMapToLocation();
});
}
protected void initManualComponents() {
setLayout(new BorderLayout());
setTitle("Map");
setName("FrmMap");
// sidebar
if (getToolbar() == null) {
setToolbar(new Toolbar());
}
FrmSideMenu.CreateToolbar(getToolbar());
this.setScrollable(false);
this.addComponent(BorderLayout.CENTER, cnt);
cnt.addMapListener(new MapListener() {
@Override
public void mapPositionUpdated(Component source, int zoom, Coord center) {
}
});
Command cmdRefresh = new
Command("",FontImage.createMaterial(FontImage.MATERIAL_REFRESH,
UIManager.getInstance().getComponentStyle("Command"), 5)) {
public void actionPerformed(com.codename1.ui.events.ActionEvent ev) {
onRefresh();
}
};
Command cmdList = new
Command("",FontImage.createMaterial(FontImage.MATERIAL_LIST,
UIManager.getInstance().getComponentStyle("Command"), 5)) {
public void actionPerformed(com.codename1.ui.events.ActionEvent ev) {
onList();
}
};
this.getToolbar().addCommandToRightBar(cmdRefresh);
this.getToolbar().addCommandToRightBar(cmdList);
}
protected void centerMapToLocation() {
LocationManager l = LocationManager.getLocationManager();
l.setLocationListener(new LocationListener() {
public void locationUpdated(Location loc) {
Coord c = new Coord(loc.getLatitude(), loc.getLongitude());
cnt.zoom(c , 13);
l.setLocationListener(null);
onMapUpdate(13, c);
}
public void providerStateChanged(int newState) {
}
});
}
protected void onMapUpdate(int zoom, Coord center) {
mo = cnt.addMarker(EncodedImage.createFromImage(image0, false),
center,
"test",
"test",
new ActionListener<ActionEvent>() {
public void actionPerformed(ActionEvent evt) {
onClickMap();
}
}
);
}
protected void onRefresh() {
mo.point.setIcon(image1);
repaint();
}
protected void onList() {
mo.point.setIcon(image2);
repaint();
}
protected void onClickMap() {
System.out.println("whoohoo");
}
}
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