MapView 上的上下文菜单或其他解决方案
我需要在我的应用程序中实现 MapView 上的上下文菜单,它获取所选长单击点的坐标并显示一组选项。 我尝试为上下文菜单注册 MapActivity,然后重写 oncreatecontextmenu 方法,但 longclick 事件似乎没有触发。 (例如,我在 oncreatecontextmenu 方法中放入了一些日志,但它从未在 ddms 上显示)
我在网络和 Android 文档中进行了搜索,但没有找到令人满意的内容。 那么,在 MapView 上创建上下文菜单真的不可能吗? 如果是这样,有没有办法实现类似的东西? 我发布(简单)代码:
public class ChoosePosition extends MapActivity {
MapView mappa;
MapController mapCtr;
LocationManager locManager;
LocationListener locLstn;
Location myLastLoc;
String locProvider;
double mylat, mylongi;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chooseposition);
locManager = (LocationManager)getSystemService(LOCATION_SERVICE);
locLstn = new MyLocationListener();
locManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
2000, 10,
locLstn);
mappa = (MapView) findViewById(R.id.map2);
mappa.setLongClickable(true);
mapCtr = mappa.getController();
// attiviamo lo zoom integrato
mappa.setBuiltInZoomControls(true);
// getting last known location
myLastLoc = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
GeoPoint point;
if (myLastLoc == null) {
mylat = myLastLoc.getLatitude();
mylongi = myLastLoc.getLongitude();
// trasformiamo l'ultima posizione in un GeoPoint
point= new GeoPoint((int) (myLastLoc.getLatitude() * 1E6),
(int) (myLastLoc.getLongitude() * 1E6));
}
// setting center and zoom
mapCtr.setCenter(point);
mapCtr.setZoom(17);
// adding an overlay
MyLocationOverlay myLocationOverlay = new MyLocationOverlay();
mappa.getOverlays().add(myLocationOverlay);
registerForContextMenu(mappa);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
Log.i("MYINFO", "I'm in");
menu.add(Menu.NONE, 0, Menu.NONE, "First option");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
return true;
}
I need to implement in my application a context menu on a MapView, which takes the coordinates of the selected long clicked point and show a set of option.
I tried to register the MapActivity for context menu and then overriding the oncreatecontextmenu method, but the longclick event seems not to fire. (e.g. I put some log in the oncreatecontextmenu method which never show on ddms)
I searched on the web and in the Android documentation but I have found nothing satisfying.
So, is it really impossible to create a contextmenu on a MapView?
If so, is there a way to implement something similar?
I'm posting the (simple) code:
public class ChoosePosition extends MapActivity {
MapView mappa;
MapController mapCtr;
LocationManager locManager;
LocationListener locLstn;
Location myLastLoc;
String locProvider;
double mylat, mylongi;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chooseposition);
locManager = (LocationManager)getSystemService(LOCATION_SERVICE);
locLstn = new MyLocationListener();
locManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
2000, 10,
locLstn);
mappa = (MapView) findViewById(R.id.map2);
mappa.setLongClickable(true);
mapCtr = mappa.getController();
// attiviamo lo zoom integrato
mappa.setBuiltInZoomControls(true);
// getting last known location
myLastLoc = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
GeoPoint point;
if (myLastLoc == null) {
mylat = myLastLoc.getLatitude();
mylongi = myLastLoc.getLongitude();
// trasformiamo l'ultima posizione in un GeoPoint
point= new GeoPoint((int) (myLastLoc.getLatitude() * 1E6),
(int) (myLastLoc.getLongitude() * 1E6));
}
// setting center and zoom
mapCtr.setCenter(point);
mapCtr.setZoom(17);
// adding an overlay
MyLocationOverlay myLocationOverlay = new MyLocationOverlay();
mappa.getOverlays().add(myLocationOverlay);
registerForContextMenu(mappa);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
Log.i("MYINFO", "I'm in");
menu.add(Menu.NONE, 0, Menu.NONE, "First option");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
return true;
}
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由于长单击事件不会触发,请尝试以下操作。
编写您自己的 Overlay 类并重写 onTab() 方法。在该方法中,您调用 openContextMenu() 方法。当您在地图上单击选项卡时,这应该会打开上下文菜单。
As the long click event doesn't fire try the following.
Write you own Overlay class and override the onTab() method. Within the method you call the openContextMenu() method. This should open the context menu when you tab on the map.