【发布时间】：2016-07-18 20:13:05
【问题描述】：
我的应用程序使用带有地图片段和列表片段的滑动选项卡运行。 该应用程序在 API 4.3 到 5.1 的所有设备上都可以正常工作，但是当我在 API 6.0 的 Android 设备上运行时，我收到此错误：
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.SupportMapFragment.getMap()' on a null object reference
这是一个文件生成错误的sn-p代码：
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
v = inflater.inflate(R.layout.fragment_mappa, null, false);
// To get City-Name from coordinates
GPSTracker gpsTracker = new GPSTracker(getActivity());
String cityName = null;
Geocoder gcd = new Geocoder(getContext(), Locale.getDefault());
List<Address> addresses = null;
try {
addresses = gcd.getFromLocation(gpsTracker.getLatitude(), gpsTracker.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
else {
//gpsTracker.showSettingsAlert();
}
if (cityName == "Rome"){
nome_citta = "Roma";
}
if (cityName == "Florence") {
nome_citta = "Firenze";
}
if (cityName == "Valencia") {
nome_citta = "Valence";
}
nome_citta = cityName;
} catch (IOException e) {
e.printStackTrace();
}
/*ImageButton b = (ImageButton) v.findViewById(R.id.refresh);
b.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new TabFragment()).commit();
}
});*/
GPSTracker mGPS = new GPSTracker(getActivity());
GPSService mGPSService = new GPSService(getActivity());
Double la = mGPSService.getLatitude();
/*mGPSService.getLocation();
if (mGPS.canGetLocation()) {
address = mGPSService.getLocationAddress();
Log.d("Address","Adrress"+address);
} else {
mGPS.showSettingsAlert();
}*/
processMap(v,10);
// map.setOnCameraChangeListener(getCameraChangeListener());
mClusterManager = new ClusterManager<Car2GoClusterItem>(getActivity(), map);
map.setOnCameraChangeListener(mClusterManager);
map.setInfoWindowAdapter(mClusterManager.getMarkerManager());
map.setOnMarkerClickListener(mClusterManager);
mClusterManager.setOnClusterItemClickListener(new ClusterManager.OnClusterItemClickListener<Car2GoClusterItem>() {
@Override
public boolean onClusterItemClick(Car2GoClusterItem item) {
clickedClusterItem = item;
return false;
}
});
// map.setOnMarkerClickListener(mClusterManager);
return v;
}
public GoogleMap.OnCameraChangeListener getCameraChangeListener()
{
return new GoogleMap.OnCameraChangeListener()
{
@Override
public void onCameraChange(CameraPosition position)
{
Log.d("Zoom", "Zoom: " + position.zoom);
if(previousZoomLevel<=15 && position.zoom>15)
{
map.clear();
processMap(v, 16);
}
if(previousZoomLevel>=15 && position.zoom<15)
{
map.clear();
processMap(v, 14);
}
previousZoomLevel = position.zoom;
}
};
}
public void processMap(View v, int zoom) {
if(map == null) {
map = ((SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map)).getMap();
}
if(map != null){
// othe code here ....................
}
为什么我只在 Android 6 上出现此错误？ 我该如何解决这个问题？ 谢谢
如果我设置
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
v = inflater.inflate(R.layout.fragment_mappa, null, false);
// To get City-Name from coordinates
GPSTracker gpsTracker = new GPSTracker(getActivity());
String cityName = null;
Geocoder gcd = new Geocoder(getContext(), Locale.getDefault());
List<Address> addresses = null;
try {
addresses = gcd.getFromLocation(gpsTracker.getLatitude(), gpsTracker.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
else {
//gpsTracker.showSettingsAlert();
}
if (cityName == "Rome"){
nome_citta = "Roma";
}
if (cityName == "Florence") {
nome_citta = "Firenze";
}
if (cityName == "Valencia") {
nome_citta = "Valence";
}
nome_citta = cityName;
} catch (IOException e) {
e.printStackTrace();
}
/*ImageButton b = (ImageButton) v.findViewById(R.id.refresh);
b.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new TabFragment()).commit();
}
});*/
GPSTracker mGPS = new GPSTracker(getActivity());
GPSService mGPSService = new GPSService(getActivity());
Double la = mGPSService.getLatitude();
/*mGPSService.getLocation();
if (mGPS.canGetLocation()) {
address = mGPSService.getLocationAddress();
Log.d("Address","Adrress"+address);
} else {
mGPS.showSettingsAlert();
}*/
processMap(v,10);
// map.setOnCameraChangeListener(getCameraChangeListener());
mClusterManager = new ClusterManager<Car2GoClusterItem>(getActivity(), map);
map.setOnCameraChangeListener(mClusterManager);
map.setInfoWindowAdapter(mClusterManager.getMarkerManager());
map.setOnMarkerClickListener(mClusterManager);
mClusterManager.setOnClusterItemClickListener(new ClusterManager.OnClusterItemClickListener<Car2GoClusterItem>() {
@Override
public boolean onClusterItemClick(Car2GoClusterItem item) {
clickedClusterItem = item;
return false;
}
});
// map.setOnMarkerClickListener(mClusterManager);
return v;
}
public GoogleMap.OnCameraChangeListener getCameraChangeListener()
{
return new GoogleMap.OnCameraChangeListener()
{
@Override
public void onCameraChange(CameraPosition position)
{
Log.d("Zoom", "Zoom: " + position.zoom);
if(previousZoomLevel<=15 && position.zoom>15)
{
map.clear();
processMap(v, 16);
}
if(previousZoomLevel>=15 && position.zoom<15)
{
map.clear();
processMap(v, 14);
}
previousZoomLevel = position.zoom;
}
};
}
public void processMap(View v, int zoom) {
if(map == null) {
map = ((SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map)).getMapAsync(this);
}
if(map != null){
}
并实现 OnMapReadyCallback 我在这一行有错误：
map = ((SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map)).getMapAsync(this);
错误 getMapAsync 返回 GoogleMap
【问题讨论】：
标签： android google-maps