與添加新的覆蓋到的MapView

空指針異常沒有爲ItemizedOverlay下面的代碼：添加此疊加MapView類與添加新的覆蓋到的MapView

private class AppointmentsOverlay extends ItemizedOverlay { 
    private List<OverlayItem> locations; 

    public AppointmentsOverlay(Drawable defaultMarker, List<Address> addresses) { 
     super(defaultMarker); 
     locations=new ArrayList<OverlayItem>(); 
     convertAddressesToOverlayItems(addresses); 
    } 

    private void convertAddressesToOverlayItems(List<Address> addresses) { 
     for (Address address:addresses) { 
      GeoPoint gp=new GeoPoint((int)(address.getLatitude()*1000000), 
       (int)(address.getLongitude()*1000000)); 
      locations.add(new OverlayItem(gp, "1", "1")); 
     } 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return locations.get(i); 
    } 

    @Override 
    public int size() { 
     return locations.size(); 
    } 
}

和下面的代碼：

private void initializeMapWithAppointments(List<Address> addresses) { 
    Drawable marker=getResources().getDrawable(R.drawable.marker); 
    mMapViewAppointments.getOverlays().add(new AppointmentsOverlay(marker, addresses)); 
    //mMapViewAppointments.setClickable(false); 
}

如果我通過的MapView點擊我以下異常消息：

04-09 19:57:36.948: E/MapActivity(7053): Couldn't get connection factory client 
04-09 19:57:41.263: E/AndroidRuntime(7053): FATAL EXCEPTION: main 
04-09 19:57:41.263: E/AndroidRuntime(7053): java.lang.NullPointerException 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.ItemizedOverlay.getItemsAtLocation(ItemizedOverlay.java:617) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.ItemizedOverlay.getItemAtLocation(ItemizedOverlay.java:586) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.ItemizedOverlay.handleMotionEvent(ItemizedOverlay.java:498) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.ItemizedOverlay.onTouchEvent(ItemizedOverlay.java:572) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.OverlayBundle.onTouchEvent(OverlayBundle.java:63) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.google.android.maps.MapView.onTouchEvent(MapView.java:679) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.View.dispatchTouchEvent(View.java:5579) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1720) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1965) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1692) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1965) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1692) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1965) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1692) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1965) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1692) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1983) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1442) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.app.Activity.dispatchTouchEvent(Activity.java:2421) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1931) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.View.dispatchPointerEvent(View.java:5759) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2970) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2529) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:869) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2538) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.os.Looper.loop(Looper.java:154) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at android.app.ActivityThread.main(ActivityThread.java:4945) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
04-09 19:57:41.263: E/AndroidRuntime(7053):  at dalvik.system.NativeStart.main(Native Method)

我不明白這意味着什麼，因爲我看不到我的ñ也可以自定義ItemizedOverlay。我已經添加了API key，並且看到空的MapView。請告訴我，我該如何解決它？謝謝。

來源

2013-04-09 user2218845

我想我不需要重寫這個方法... – user2218845 2013-04-09 16:03:00

在任何數據填充之前，您需要在ItemizedOverlay中調用populate()。

public AppointmentsOverlay(Drawable defaultMarker, List<Address> addresses) { 
     super(defaultMarker); 
     populate(); // Add this 
     locations=new ArrayList<OverlayItem>(); 
     convertAddressesToOverlayItems(addresses); 
    }

如說here

來源

2013-04-09 16:03:10 BobTheBuilder

是它幫助我，但現在我沒有看到任何MapView類項目，可能是因爲我得到的例外「無法獲得連接工廠客戶端「 – user2218845 2013-04-09 16:13:22

與添加新的覆蓋到的MapView

回答

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