我正在尝试将我自己的类的对象作为活动结果返回,但我得到的只是空指针……我阅读了一些教程,但没有足够的关于 Own 类结果的信息。
代码:
GPS客户端活动:
public class GPSClientActivity extends Activity {
private MapView view;
private MapDrawer mainDrawer;
private Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gps);
view = (MapView) findViewById(R.id.mapView);
view.setTileSource(TileSourceFactory.MAPNIK);
view.setBuiltInZoomControls(true);
MapController mapController = view.getController();
mapController.setZoom(10);
GeoPoint point2 = new GeoPoint(51496994, -134733);
mapController.setCenter(point2);
mainDrawer=new MapDrawer(view);
final Button button = (Button) findViewById(R.id.addButton);
button.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
intent=new Intent(GPSClientActivity.this,WaypointSetupActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivityForResult(intent,1);
return false;
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK)
{
MapPoint point=(MapPoint) intent.getSerializableExtra("result");
GeoPoint point2 = new GeoPoint(51496994, -134254);
point.setGeo(point2);
mainDrawer.addGeopointToMap(point.getName(), point.getDesc(), point.getPos());
}
}
}
WaypointSetupActivity:
public class WaypointSetupActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_waypoint_setup);
final Button button = (Button) findViewById(R.id.butConfirm);
final EditText nameField=(EditText)findViewById(R.id.editText1);
final EditText descField=(EditText)findViewById(R.id.editText2);
button.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent arg1)
{
MapPoint point=new MapPoint("","", 1, 1, null);
Intent result=new Intent();
result.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
result.putExtra("result", point);
setResult(WaypointSetupActivity.RESULT_OK,result);
finish();
return false;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.waypoint_setup, menu);
return true;
}
}
地图点:
public class MapPoint implements Serializable
{
private int priority;
private int type;//person,building,vehicle,custom
private String description;
private String name;
private GeoPoint position;
public MapPoint(String nam,String desc,int typ,int prio,GeoPoint pos)
{
priority=prio;
type=typ;
description=desc;
nam=name;
position=pos;
}
public void setGeo(GeoPoint geo)
{position=geo;}
public int getPrio()
{return priority;}
public int getType()
{return type;}
public String getDesc()
{return description;}
public String getName()
{return name;}
public GeoPoint getPos()
{return position;}
public OverlayItem convertToOverlayItem(MapPoint point)
{
OverlayItem item=new OverlayItem(point.getName(),point.getDesc(),point.getPos());
return item;
}
}
地图抽屉:
public class MapDrawer
{
private ArrayList<OverlayItem> items;
private ArrayList<MapPoint> mapPoints;
private MapView currentMapview;
public MapDrawer(MapView view)
{
GeoPoint geo=new GeoPoint(51496994, -134733);
items=new ArrayList<OverlayItem>();
mapPoints=new ArrayList<MapPoint>();
currentMapview=view;
// reconfigurePainter();- error
//addGeopointToMap("meno","popis",geo);
}
public void addGeopointToMap(String name,String description,GeoPoint point)
{
MapPoint Mpoint=new MapPoint("meno","popis", 1, 1,point);
mapPoints.add(Mpoint);
items.add(Mpoint.convertToOverlayItem(Mpoint));
reconfigurePainter();
}
public void reconfigurePainter()
{
DefaultResourceProxyImpl proxy=new DefaultResourceProxyImpl(currentMapview.getContext());
ItemizedIconOverlay<OverlayItem> painter=new ItemizedIconOverlay<OverlayItem>(items, null, proxy);
currentMapview.getOverlays().add(painter);
}
}