谷歌地图片段android

Question

我在片段中加载谷歌地图时遇到问题.一切都从一个启动活动"ViatgeDetallViewActivity"的回收器视图适配器开始:

Context context = mActivity.getApplicationContext(); 
                    Intent intent = new Intent(context, ViatgeDetallViewActivity.class);
                   holder.mViatge.getId());
                    intent.putExtra("desc",p.getDesc());
                    intent.putExtra("location",p.getLocation());
                    mActivity.startActivityForResult(intent,ACTIVITY_View);

这是我的DetallViewActivity:

public class ViatgeDetallViewActivity extends AppCompatActivity {

ViatgeDetallViewFragment fragment;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_view);
    Bundle extras = getIntent().getExtras();
    if(extras != null)
    {

        String s =  getIntent().getStringExtra("desc");
        Location l = getIntent().getParcelableExtra("location");

        Log.d("myTag", "estoy en el oncreate de detallviewActivity pasando pro extras" + s );


    }

        fragment = new ViatgeDetallViewFragment();


        getSupportFragmentManager().beginTransaction()
                .add(R.id.activity_fragment_view, fragment)  
                .commit();
     getFragmentManager().beginTransaction().add(R.id.activity_fragment_view, fragment).commit();
    }
}

我的ViatgeDetallViewFragment是:

public class ViatgeDetallViewFragment extends Fragment implements OnMapReadyCallback {

private GoogleMap mMap;
private Marker mMarcadorActual;

public ViatgeDetallViewFragment() {
}
....
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_view, container, false);


    SupportMapFragment mapFragment =
            (SupportMapFragment)
                    getChildFragmentManager().findFragmentById(R.id.fragment_view_map);
    mapFragment.getMapAsync(this);


    return rootView;
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;


   //ask for permissions..
        mMap.setMyLocationEnabled(true);


    LatLng sydney = new LatLng(-34, 151);
    mMarcadorActual = mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));

}

布局是,Activity_view:

<Linear ...

  <android.support.v7.widget.Toolbar
        android:id="@+id/tlbMenuView"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        />

    <FrameLayout
        android:id="@+id/activity_fragment_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

fragment_view:

<LinearLayout android:id="@+id/layout_fragment_view" xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
..
    <fragment
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/fragment_view_map"
        class="com.google.android.gms.maps.MapFragment"></fragment>

</LinearLayout>

当我尝试启动"ViatgeDetallActivity"时出现问题,我在日志中得到了这个:

致命异常:主进程:com.example.usuari.myapplication3,PID:6390 java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.usuari.myapplication3/com.example.usuari.myapplication3.ViatgeDetallViewActivity}:java. lang.NullPointerException:尝试在android.app.ActivityThread上的空对象引用上调用虚方法'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)'.在Android.app.ActivityThread.access $ 1100(ActivityThread.java:222)上的android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350)上的performLaunchActivity(ActivityThread.java:3254)在android.app.ActivityThread $ H.handleMessage( ActivityThread.java:1795)android.app.Handler.dispatchMessage(Handler.java:102)android.app.Looper.loop(Looper.java:158)android.app.ActivityThread.main(ActivityThread.java:7229) )在com.android.internal.os.ZygoteInit $ MethodAndArgsC的java.lang.reflect.Method.invoke(Native Method)中 aller.run(ZygoteInit.java:1230)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)引起:java.lang.NullPointerException:尝试调用虚方法'void com.google.android .sms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)'在android.support的com.example.usuari.myapplication3.ViatgeDetallViewFragment.onCreateView(ViatgeDetallViewFragment.java:82)上的空对象引用上.s4.app.Fragment.performCreateView(Fragment.java:2074)位于android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)的android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java) :1286)在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758)android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1671)android.support.v4.app上的android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758). FragmentController.execPendingActions(FragmentController.java:388)在android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:619)在android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1265)的android.app.A活动中的android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3217)的android.app.Activity.performStart(Activity.java:6915). Activity.Thread.handleLaunchActivity(ActivityThread.java:3350)在android.app.AcessTacread $ 1100(ActivityThread.java:222)android.app.AandThread $ H.handleMessage(ActivityThread.java:1795)android.O. dispatchMessage(Handler.java:102)位于android.app.Looper.loop(Looper.java:158)的android.app.ActivityThread.main(ActivityThread.java:7229),位于java.lang.reflect.Method.invoke(Native方法)com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1230)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)03-24 02:55:53.871 6390-7362/com.example.usuari.myapplication3 W/DynamiteModule:找不到com.google.android.gms.googlecertificates的本地模块描述符类.03-24 02:55:53.881 6390-7362/com.example.usuari.myapplication3 I/DynamiteModule:考虑本地模块com.google.android.gms.googlecertificates:0和远程模块com.google.android.gms.googlecertificates: 2 03-24 02:55:53.881 6390-7362/com.example.usuari.myapplication3 I/DynamiteModule:com.google.android.gms.googlecertificates的选定远程版本,版本

= 2 03-24 02:55:53.881 6390-7362/com.example.usuari.myapplication3 W/ResourcesManager:getTopLevelResources:/data/user/0/com.google.android.gms/app_chimera/m/00000005/DynamiteModulesA_GmsCore_prodmnc_alldpi_release. apk/1.0在com.example.usuari.myapplication3中运行comrc包com.example.usuari.myapplication3 03-24 02:55:53.891 6390-7362/com.example.usuari.myapplication3 D/ResourcesManager:对于用户0新的叠加层取得Null 03-24 02:55:53.891 6390-7362/com.example.usuari.myapplication3 W/ResourcesManager:getTopLevelResources:/data/user/0/com.google.android.gms/app_chimera/m/00000005/DynamiteModulesA_GmsCore_prodmnc_alldpi_release. apk/1.0在com.example.usuari.myapplication3 comrc中运行com.example.usuari.myapplication3

Answer 1

你mapFragment是空的.试试这个:

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
 super.onViewCreated(view, savedInstanceState);
MapFragment mapFragment = (MapFragment) getActivity().getFragmentManager().findFragmentById(R.id.fragment_view_map);
}