Question

我在两部手机上测试我的应用程序（1）运行2.3.7的LG Optima和（2）运行4.1.2的galaxy S3。以下代码始终适用于LG，并且总是在Galaxy上失败并出现nullPointerException。

try { //sometimes getting the last known location gets a nullpointerexception
    String locationProvider = LocationManager.GPS_PROVIDER;
    locMgr = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
    Location myLoc = locMgr.getLastKnownLocation(locationProvider);
    CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(myLoc.getLatitude(), myLoc.getLongitude()));
    map.animateCamera(center);
    DebugLog.debugLog("Instantiated new Location listener.  Moved camera to: " + myLoc.getLatitude() + myLoc.getLongitude() , false);

} catch (Exception e) {
    DebugLog.debugLog("Exception getting lastknownlocation - doing without" + e, false);
}

这段代码有问题吗？谢谢，加里

Answer 1

此代码有问题吗？

您没有检查myLoc是否为null。 getLastKnownLocation()不必返回非null值。

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