我尝试调用包含来自 Google 地图的地图的 FragmentActivity ......但日志显示了这个错误：
08-13 20:35:02.764: E/AndroidRuntime(575): FATAL EXCEPTION: main
08-13 20:35:02.764: E/AndroidRuntime(575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testeslidingmenuagvdnc/com.netimoveis.appandroid.Menu_ImoveisNoMapa}: java.lang.NullPointerException
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.os.Handler.dispatchMessage(Handler.java:99)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.os.Looper.loop(Looper.java:126)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread.main(ActivityThread.java:3997)
08-13 20:35:02.764: E/AndroidRuntime(575): at java.lang.reflect.Method.invokeNative(Native Method)
08-13 20:35:02.764: E/AndroidRuntime(575): at java.lang.reflect.Method.invoke(Method.java:491)
08-13 20:35:02.764: E/AndroidRuntime(575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
08-13 20:35:02.764: E/AndroidRuntime(575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
08-13 20:35:02.764: E/AndroidRuntime(575): at dalvik.system.NativeStart.main(Native Method)
08-13 20:35:02.764: E/AndroidRuntime(575): Caused by: java.lang.NullPointerException
08-13 20:35:02.764: E/AndroidRuntime(575): at com.netimoveis.appandroid.Menu_ImoveisNoMapa.onCreate(Menu_ImoveisNoMapa.java:29)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
08-13 20:35:02.764: E/AndroidRuntime(575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)
08-13 20:35:02.764: E/AndroidRuntime(575): ... 11 more
调用 googleMaps 的片段活动：
public class Menu_ImoveisNoMapa extends android.support.v4.app.FragmentActivity {
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu__imoveis_no_mapa);
LatLng latLong = new LatLng(-2033681,-4028611);
LatLng latLong2 = new LatLng(-2354356,-4663941);
//map = ((MapFragment) (getFragmentManager().findFragmentById(R.id.map))).getMap();
map = ((MapFragment) (getFragmentManager().findFragmentById(R.id.map))).getMap();
//map.addMarker(new MarkerOptions().position(latLong).title("Exemplo1"));
//map.addMarker(new MarkerOptions().position(latLong2).title("Exemplo2"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu__imoveis_no_mapa, menu);
return true;
}
}
///////////////////XML 代码：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Menu_ImoveisNoMapa" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</RelativeLayout>
我在这里称之为 FragmentActivity（案例 101）：
public class SlidingMenuFragment extends Fragment implements ExpandableListView.OnChildClickListener {
private ExpandableListView sectionListView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
List<Section> sectionList = createMenu();
View view = inflater.inflate(R.layout.slidingmenu_fragment, container,false);
this.sectionListView = (ExpandableListView) view.findViewById(R.id.slidingmenu_view);
ImageView tv = new ImageView(getActivity());
Drawable dw = getResources().getDrawable(R.drawable.menu_netimoveis_locacao);
tv.setImageDrawable(dw);
this.sectionListView.addHeaderView(tv);
this.sectionListView.setGroupIndicator(null);
SectionListAdapter sectionListAdapter = new SectionListAdapter(this.getActivity(), sectionList);
this.sectionListView.setAdapter(sectionListAdapter);
this.sectionListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
return true;
}
});
this.sectionListView.setOnChildClickListener(this);
int count = sectionListAdapter.getGroupCount();
for (int position = 0; position < count; position++) {
this.sectionListView.expandGroup(position);
}
return view;
}
private List<Section> createMenu() {
List<Section> sectionList = new ArrayList<Section>();
Section oDemoSection = new Section("Menu");
oDemoSection.addSectionItem(101,"Imoveis no Mapa ", "map_marker");
oDemoSection.addSectionItem(102, "Favoritos ", "star");
oDemoSection.addSectionItem(103, "Agências ", "house");
oDemoSection.addSectionItem(104, "Dicas para alugar ", "coffee");
oDemoSection.addSectionItem(105, "Alugar meu imóvel ", "pricetag");
//
// Section oGeneralSection = new Section("General");
// oGeneralSection.addSectionItem(201, "Settings", "slidingmenu_settings");
// oGeneralSection.addSectionItem(202, "Rate this app", "slidingmenu_rating");
// oGeneralSection.addSectionItem(203, "Eula", "slidingmenu_eula");
// oGeneralSection.addSectionItem(204, "Quit", "slidingmenu_quit");
//
sectionList.add(oDemoSection);
//sectionList.add(oGeneralSection);
return sectionList;
}
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
FragmentActivity newContent = null;
switch ((int)id) {
case 101:
Intent myIntent = new Intent(getActivity(), Menu_ImoveisNoMapa.class);
getActivity().startActivity(myIntent);
break;
case 102:
//TODO
break;
case 201:
//TODO
break;
case 202:
//TODO
break;
case 203:
//TODO
break;
case 204:
//TODO
break;
}
return false;
}
}