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嘗試爲手機創建ListFragment - > MapFragment活動。 MapFragment代碼如下：MapFragment錯誤 - CameraUpdateFactory未初始化
public class MapFragment extends SupportMapFragment {
private GoogleMap mMap;
@Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
try {
MapsInitializer.initialize(this.getActivity());
} catch (GooglePlayServicesNotAvailableException e){
e.printStackTrace();
}
setRetainInstance(true);
}
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
if(getMap() != null){
Log.v(TAG, "Map ready for use!");
mMap = getMap();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = super.onCreateView(inflater, container, savedInstanceState);
return root;
}
public void animateTo(double lat, double lng){
Log.d(TAG, "mMap animating...");
LatLng mCurrentPosition = new LatLng(lat, lng);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mCurrentPosition, 16));
}
}
，但我得到了下面的錯誤---
02-15 17:12:53.232: E/AndroidRuntime(6913): FATAL EXCEPTION: main
02-15 17:12:53.232: E/AndroidRuntime(6913): java.lang.NullPointerException: CameraUpdateFactory is not initialized
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.google.android.gms.internal.at.a(Unknown Source)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.google.android.gms.maps.CameraUpdateFactory.J(Unknown Source)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.google.android.gms.maps.CameraUpdateFactory.newLatLngZoom(Unknown Source)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.test.app.MapFragment.animateTo(MapFragment.java:113)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.test.app.MapActivity.onListItemClick(MapActivity.java:270)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.test.app.SimpleListFragment.onListItemClick(SimpleListFragment.java:65)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.widget.AbsListView$1.run(AbsListView.java:3423)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.os.Handler.handleCallback(Handler.java:725)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.os.Handler.dispatchMessage(Handler.java:92)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.os.Looper.loop(Looper.java:137)
02-15 17:12:53.232: E/AndroidRuntime(6913): at android.app.ActivityThread.main(ActivityThread.java:5039)
02-15 17:12:53.232: E/AndroidRuntime(6913): at java.lang.reflect.Method.invokeNative(Native Method)
02-15 17:12:53.232: E/AndroidRuntime(6913): at java.lang.reflect.Method.invoke(Method.java:511)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-15 17:12:53.232: E/AndroidRuntime(6913): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-15 17:12:53.232: E/AndroidRuntime(6913): at dalvik.system.NativeStart.main(Native Method)
我想調用MapInitializer將修復它，但似乎並沒有這樣的伎倆。這是否與調用getMap()方法的時間有關？
確定'mMap' ISN在這一點上是否爲null？對'CameraUpdateFactory.newLatLngZoom'的調用將首先進行，因此您不會在'mMap'上看到NPE - 但這會解釋看到此錯誤。 – 2013-02-15 22:58:30
在我的主要活動中，我稱'MapFragment mFragment = new MapFragment（）'，我認爲這意味着mMap不會是空的。也許這是一個不正確的假設？在調用之後，我使用'FragmentTransaction'來嘗試替換我的'FrameLayout'，其id爲'content_frame'，但它一直給我NPE。 – codedawg82 2013-02-15 23:07:57
那麼，你有一個日誌調用在那裏 - 「地圖準備好使用！」在異常之前的任何地方出現在日誌中？ – 2013-02-15 23:18:21