Mapview closing

Nyptop said:

Hi again,

Everything is working great except for one thing. The map shows an area which is a couple of kilometers out. Sometimes it is right above where the man icon is (where I want the map to be centred). Is my phone the problem or is there something in the code I could amend?

Thanks,

Neil

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Sub MyLocationOverlay1_FollowLocationAutoDisabled
    Log("FollowLocation has been disabled")
End Sub

Nyptop said:

With this code, whenever the screen is pressed the map view disappears. I don't want the map view to disappear. I want it to either: 'not react to user interaction what so ever' or 'users can move the view around but when the location is changed then it snaps back to the new location'. I'm sure its a simple fix but it has stumped me for quite a while :L Thanks in advance! (By the way OSMDroid, fantastic mapview library. I'm loving it! learning java so hopefully in a bit I'll be able to contribute some libraries) Here is the code:

B4X:

Sub Process_Globals
    Dim MapCenter As GeoPoint
    Dim TileSource As String
    Dim ZoomLevel As Int
    
    '    create some variables to save the MyLocationOverlay state
    Dim CompassEnabled, FollowLocationEnabled, MyLocationEnabled As Boolean
End Sub

Sub Globals
    Dim MapView1 As MapView
    Dim MinimapOverlay1 As MinimapOverlay
    Dim ScaleBarOverlay1 As ScaleBarOverlay

    
    '    create the MyLocationOverlay
    Dim MyLocationOverlay1 As MyLocationOverlay
End Sub

Sub Activity_Create(FirstTime As Boolean)
    '    update the MenuItems
    Activity.AddMenuItem("Toggle Compass", "MenuItemSelect")
    Activity.AddMenuItem("Toggle MyLocation", "MenuItemSelect")
    Activity.AddMenuItem("Toggle FollowLocation", "MenuItemSelect")
    
    '    MapView initialized with no EventName as we'll not be listening for MapView events
    MapView1.Initialize("")
    Activity.AddView(MapView1, 0, 0, 100%x, 100%y)
   
    MapView1.SetMultiTouchEnabled(True)
    MapView1.SetZoomEnabled(True)
    
    '    initialize and add the MyLocationOverlay to the MapView, an EventName is used as we'll be listening for all three events that this overlay generates
    MyLocationOverlay1.Initialize(MapView1, "MyLocationOverlay1")
    MapView1.AddOverlay(MyLocationOverlay1)
    
    If FirstTime Then

        TileSource="Mapnik"
        ZoomLevel=14
        
        '    set the default values for the new variables
        CompassEnabled=MyLocationOverlay1.CompassEnabled
        FollowLocationEnabled=MyLocationOverlay1.FollowLocationEnabled
        MyLocationEnabled=MyLocationOverlay1.MyLocationEnabled
    Else
        '    restore the MyLocationOverlay state
        MyLocationOverlay1.CompassEnabled=CompassEnabled
    End If
    
    MapView1.Zoom=ZoomLevel
    MyLocationOverlay1.MyLocationEnabled = True
   MyLocationOverlay1.FollowLocationEnabled = True
    
    ScaleBarOverlay1.Initialize(MapView1)
    MapView1.AddOverlay(ScaleBarOverlay1)
End Sub

Sub Activity_Resume
End Sub

Sub Activity_Pause (UserClosed As Boolean)
    MapCenter=MapView1.GetCenter
    TileSource=MapView1.GetTileSource
    ZoomLevel=MapView1.Zoom
    
    '    save the MyLocationOverlay state
    CompassEnabled=MyLocationOverlay1.CompassEnabled
    FollowLocationEnabled=MyLocationOverlay1.FollowLocationEnabled
    MyLocationEnabled=MyLocationOverlay1.MyLocationEnabled
    
    '    disable MyLocationOverlay compass and GPS listening
    MyLocationOverlay1.CompassEnabled=False
    MyLocationOverlay1.MyLocationEnabled=False
End Sub

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GKTechnology said:

I tried that code but i get the same error that i do its a null pointer exception at mylocationoverlay1.initialize(Mapview1, "MylocationOverlay")

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warwound said:

If i run the code that you posted then the Activity force closes as soon as i start it.
That's a null pointer exception as it can't find the drawables required by the MyLocationOverlay.

So i copied the library drawable-nodpi folder containing the required drawables to the Objects/res folder and the code compiles and runs as expected.

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