CODE

onResume中的

：

FragmentManager fm=getActivity().getSupportFragmentManager();
SupportMapFragment smf = (SupportMapFragment) fm.findFragmentById(R.id.mySupportMapId);
googleMap=smf.getMap();

in xml

 <FrameLayout
                android:id="@+id/rootJobsLocationId"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:orientation="vertical" >

                <fragment
                    android:id="@+id/mySupportMapId"
                    android:name="com.google.android.gms.maps.SupportMapFragment"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:scaleType="center" />

other code

错误

smf变为空

注意： 我有一个设备有谷歌播放服务....当我使用regularfragment而不是支持片段时，这个错误不存在

Answer 1

试试这种方式

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/iqamah_map"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:name="com.google.android.gms.maps.SupportMapFragment" />

// Java代码

    public class xxxx extends FragmentActivity {

   GoogleMap map;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xxx);
map =((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.iqamah_map)).getMap();

    }
}

Answer 2

使用此

    (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.mySupportMapId)).getMap();
SupportMapFragment smf = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
googleMap = smf.getMap();

而不是

    FragmentManager fm=getActivity().getSupportFragmentManager();
SupportMapFragment smf = (SupportMapFragment) fm.findFragmentById(R.id.mySupportMapId);
googleMap=smf.getMap();

Answer 3

在java文件中试用此代码，

首先，YourActivity是扩展FragmentActivity或ActionBarActivity

将此代码放在Fragment java文件onCreateView（）方法

上

    SupportMapFragment  googleMap = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.mapview);

还要破坏片段上的mapview，

@Override
public void onDestroyView() {
    super.onDestroyView();
    SupportMapFragment suMapFrag = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.mapview);
    if (suMapFrag != null)
        getSupportFragmentManager().beginTransaction().remove(suMapFrag ).commit();
}

我希望这段代码能正常工作...... !!!

空指针findFragmentById查找地图视图的异常

CODE

错误

3 个答案: