Question

我有一个标签导航工作（2个标签）。在第二个标签中，我想插入一个谷歌地图对象。

使用标签的代码：

public class FragmentTabsTienda extends SherlockFragmentActivity {
private static String TAG = "TabActivity";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.frag_pdvs);
    FragmentManager fm = getSupportFragmentManager();

    ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab tab1 = actionBar.newTab();
    tab1.setText("Lista");
    tab1.setIcon(R.drawable.ic_action_view_as_list);

    ActionBar.Tab tab2 = getSupportActionBar().newTab();
    tab2.setText("Mapa");
    tab2.setIcon(R.drawable.ic_action_location_map);
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setTitle("");

    actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME
            | ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_CUSTOM);

    // create the two fragments we want to use for display content

    tab1.setTabListener(new TabListener<ListTiendaTabFragment>(this,
            "lista", ListTiendaTabFragment.class));
    tab2.setTabListener(new TabListener<MapTiendasTabFragment>(this,
            "mapa", MapTiendasTabFragment.class));

    actionBar.addTab(tab1);
    actionBar.addTab(tab2);
    // tab2.setTabListener(new TabListener(fMapTiendas));
}

public static class TabListener<T extends Fragment> implements
        ActionBar.TabListener {
    private Fragment mFragment;
    private final Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    /**
     * Constructor used each time a new tab is created.
     * 
     * @param activity
     *            The host Activity, used to instantiate the fragment
     * @param tag
     *            The identifier tag for the fragment
     * @param clz
     *            The fragment's Class, used to instantiate the fragment
     */
    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }

    /* The following are each of the ActionBar.TabListener callbacks */

    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            // Detach the fragment, because another one is being attached
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
        // User selected the already selected tab. Usually do nothing.
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    menu.add("camara").setIcon(R.drawable.ic_action_device_access_camera)
            .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);

    menu.add("chat").setIcon(R.drawable.ic_action_social_chat)
            .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);

    menu.add("settings").setIcon(R.drawable.ic_settings)
            .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);

    return super.onCreateOptionsMenu(menu);
}

}

在第一个标签中，我的列表显示效果很好。但我无法显示我的地图：

这是我要显示地图的标签的代码：

public class MapTiendasTabFragment extends SherlockFragment {
GoogleMap mMap = null;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View root = super.onCreateView(inflater, container, savedInstanceState);

    return root;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    mMap = initMap();
}

private GoogleMap initMap() {

    if (mMap == null) {
        FragmentManager fm = getSherlockActivity().getSupportFragmentManager();
        SupportMapFragment smf = (SupportMapFragment) fm.findFragmentById(R.id.map); // is null !!
        mMap = smf.getMap();

    } else {
        mMap.setMyLocationEnabled(true);
        // Iniciar centrado en Mexico
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
                19.506467, -99.131417), 4));
    }

    return mMap;
}
}

和关联的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll_map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<FrameLayout
    android:id="@+id/fl_map"
    android:layout_width="fill_parent"
    android:layout_height="0.0dip"
    android:layout_weight="1.0" >

    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment" />

    <TextView
        android:id="@+id/maps_unavailable"
        style="@style/placeholder_text"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/maps_unavailable"
        android:visibility="gone" />

    <View
        android:id="@+id/shadow"
        android:layout_width="fill_parent"
        android:layout_height="4.0dip"
        android:layout_gravity="bottom|center"
        android:background="@drawable/inset_bottom_shadow" />

    <ProgressBar
        android:id="@+id/ab_progress"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:indeterminate="true"
        android:visibility="gone" />
</FrameLayout>
<!-- 
<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="fill_parent"
    android:layout_height="@dimen/map_pager_height" />
 -->
</LinearLayout>

在我的代码中，SupportMapFragment smf为null，我无法获得任何值！任何帮助将不胜感激

Answer 1

这个问题已经解决了这个问题： https://gist.github.com/joshdholtz/4522551

public class SomeFragment extends Fragment {

MapView mapView;
GoogleMap map;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.some_layout, container, false);

    // Gets the MapView from the XML layout and creates it
    mapView = (MapView) v.findViewById(R.id.mapview);
    mapView.onCreate(savedInstanceState);

    // Gets to GoogleMap from the MapView and does initialization stuff
    map = mapView.getMap();
    map.getUiSettings().setMyLocationButtonEnabled(false);
    map.setMyLocationEnabled(true);

    // Needs to call MapsInitializer before doing any CameraUpdateFactory calls
    try {
        MapsInitializer.initialize(this.getActivity());
    } catch (GooglePlayServicesNotAvailableException e) {
        e.printStackTrace();
    }

    // Updates the location and zoom of the MapView
    CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(43.1, -87.9), 10);
    map.animateCamera(cameraUpdate);

    return v;
}

@Override
public void onResume() {
    mapView.onResume();
    super.onResume();
}

@Override
public void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}

@Override
public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
}

}

Sherlock Tab中的谷歌地图

1 个答案: