3

尝试将地图动画到某个 GeoPoint 时,我遇到了一个致命的异常 - 这是异常:

12-20 17:53:20.400: E/Crittercism(3523): java.lang.NullPointerException
12-20 17:53:20.400: E/Crittercism(3523): at com.amazon.geo.maps.MercatorProjection.latLongToWorldPixels(MercatorProjection.java:397)
12-20 17:53:20.400: E/Crittercism(3523): at com.amazon.geo.maps.MercatorProjection.toPixels(MercatorProjection.java:69)
12-20 17:53:20.400: E/Crittercism(3523): at com.amazon.geo.maps.MapView.animateTo_AmazonInternal(MapView.java:1801)
12-20 17:53:20.400: E/Crittercism(3523): at com.amazon.geo.maps.MapController.animateTo(MapController.java:46)
12-20 17:53:20.400: E/Crittercism(3523): at com.fatattitude.myapplication.MyMapActivity.moveMapToPoint(BusMapActivity.java:1564)

这是我的代码。我的日志输出还显示 GeoPoint 的值为LatitudeE6= 51537141LongitudeE6= -246271

private void moveMapToPoint(GeoPoint gp, int zoomLevel) {
MapController mc = mapView.getController();

if (zoomLevel < 0)
zoomLevel = mapView.getZoomLevel();

mc.stopAnimation(true);
mc.setZoom(zoomLevel);

String strGeoPointInfo = String.format("Lat:%d, Lng:%d", gp.getLatitudeE6(), gp.getLongitudeE6() );
Log.i("GeoPoint-Info", "**moveMapToPoint: " + strTestOutput);

mc.animateTo(gp);
}

如果我评论该行

//mc.stopAnimation(true);

我不再得到例外。

谁能帮我理解为什么会发生这个异常?

请帮助我。

4

1 回答 1

4

该应用程序可能会在 GPS 传感器寻找位置之前等待。

mMyLocationOverlay.runOnFirstFix(new Runnable() { 
    public void run() {
                    mapView.getController().animateTo(myLocation);
        }});                         
于 2013-01-17T08:35:33.340 回答