我发现了许多与在片段中添加地图片段相关的线程。但他们并没有帮助我解决我的问题。我试图将地图片段添加到片段中。但我得到空指针异常如下:
11-25 10:19:55.222 9101-9101/com.uma.mobile E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.uma.mobile, PID: 9101
java.lang.NullPointerException
at com.uma.mobile.subview.ShopDetails.<init>(ShopDetails.java:122)
at com.uma.mobile.activity.Shop.onCreateView(Shop.java:119)
at android.app.Fragment.performCreateView(Fragment.java:1700)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.run(BackStackRecord.java:684)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4998)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
at dalvik.system.NativeStart.main(Native Method)
其中 Shop.java 扩展了 Fragment 并且 ShopDetails 扩展了包含 mapFragement 的 RelativeLayout。
shop_details.xml :
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/mapTile"
android:layout_marginTop="10dp"
android:padding="10dp"
android:background="@drawable/grey_gradient_rounded"
android:layout_below="@+id/description">
<RelativeLayout
android:id="@+id/mapViewContainer"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/nearestLocation"
android:layout_alignBottom="@+id/tapToView" />
<!--<fragment xmlns:android="http://schemas.android.com/apk/res/android"-->
<!--android:id="@+id/mapView"-->
<!--android:layout_width="100dp"-->
<!--android:layout_height="wrap_content"-->
<!--android:name="com.google.android.gms.maps.MapFragment"/>-->
这就是我添加地图片段的方式
mapFragment = new MapFragment();
FragmentTransaction transaction= fm.findFragmentByTag("SHOPS").getChildFragmentManager().beginTransaction();
transaction.add(R.id.mapViewContainer,mapFragment,"MAP_FRAG").commit();
这是我得到异常的地方:
try {
MapsInitializer.initialize(activity);
mapFragment.getMap().getUiSettings().setZoomControlsEnabled(false);
LatLng position = new LatLng(loc._latitude, loc._longitude);
MarkerOptions markerOptions = new MarkerOptions()
.position(position)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow_pin2x));
mapFragment.getMap().addMarker(markerOptions);
mapFragment.getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(position, 14));
} catch (GooglePlayServicesNotAvailableException e) {
e.printStackTrace();
fm.beginTransaction().hide(mapFragment).commit();
}
.icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow_pin2x));
map.addMarker(markerOptions);
map.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 14));
在mapFragment.getMap().getUiSettings()