mainActivity의 탐색 모드에서 작업 표시 줄을 사용하고 있습니다. 서로 다른 탭에는 다른 레이아웃이 있으며이 탭 중 하나에 MapFragment가있는 레이아웃을 포함합니다. 다음 코드를 사용하면 앱이 제대로 작동하고 mapFragments가 제대로 작동하며 탭이 정상적으로 작동합니다. 그러나 일단 myFragment에 임베드 된 mapFragment에 액세스하려면 getFragmentManager(). findFragmentById (R.id.map_add)를 사용합니다. 항상 null을 반환합니다.findFragmentById는 항상 null을 반환합니다.
FragmentManager 및 FragmentTransaction을 사용하여 myfragment 및 MapFragment를 추가했지만 findFragmentById (R.id.map_add)에서 Null을 여전히 가져 왔습니다.
는 MainActivity는 다음과 같이 초기화 ... 도와주세요 :
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.main);
// ActionBar gets initiated
ActionBar actionbar = getActionBar();
// Tell the ActionBar we want to use Tabs.
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// initiating the tabs and set text to it.
ActionBar.Tab myTab = actionbar.newTab().setText("hey");
// create the fragments we want to use for display content
Fragment myFragment = new myFragment();
// set the Tab listener. Now we can listen for clicks.
myTab.setTabListener(new MyTabsListener(myFragment));
// add the tabs to the actionbar
actionbar.addTab(myTab);
map=((MapFragment)getFragmentManager().findFragmentById(R.id.map_add)).getMap();//line 103
}
MainActivity의 레이아웃, main.xml에
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_container"
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=".MainActivity" >
</RelativeLayout>
tablistener의 코드 :
class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(fragment);
}
}
myFragment의 코드 :
,691,363,210public static class AddAliasFragment extends Fragment {
private static View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.myfragment_layout, container, false);
} catch (InflateException e) {
/* map is already there, just return view as it is */
}
return view;
}
public MapFragment getMapFragment(){
return (MapFragment)getFragmentManager().findFragmentById(R.id.map_add);
}
}
myFragment 레이아웃 :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map_add_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText
android:id="@+id/search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="@string/searchhint"
/>
<Button
android:id="@+id/searchbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/search"
android:layout_toRightOf="@id/search"
android:text="@string/go" />
<fragment
android:id="@+id/map_add"
android:tag="add"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/search"
android:name="com.google.android.gms.maps.MapFragment"/>
로그 캣 출력 myfragment_layout.xml 다음 nullpointer 예외 (103)를 일렬로 지칭 상기하여 getMap() 라인이고, I는 후 주석에있을 상술 한 코드
04-02 21:23:12.122: E/AndroidRuntime(3672): FATAL EXCEPTION: main
04-02 21:23:12.122: E/AndroidRuntime(3672): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.test/com.test.test.MainActivity}: java.lang.NullPointerException
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2357)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread.access$600(ActivityThread.java:153)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.os.Looper.loop(Looper.java:137)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread.main(ActivityThread.java:5226)
04-02 21:23:12.122: E/AndroidRuntime(3672): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 21:23:12.122: E/AndroidRuntime(3672): at java.lang.reflect.Method.invoke(Method.java:511)
04-02 21:23:12.122: E/AndroidRuntime(3672): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
04-02 21:23:12.122: E/AndroidRuntime(3672): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-02 21:23:12.122: E/AndroidRuntime(3672): at dalvik.system.NativeStart.main(Native Method)
04-02 21:23:12.122: E/AndroidRuntime(3672): Caused by: java.lang.NullPointerException
04-02 21:23:12.122: E/AndroidRuntime(3672): at com.test.test.MainActivity.onCreate(MainActivity.java:103)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.Activity.performCreate(Activity.java:5104)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-02 21:23:12.122: E/AndroidRuntime(3672): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)
04-02 21:23:12.122: E/AndroidRuntime(3672): ... 11 more
도 logcat 오류를 표시합니다. –
동일한 조각 map_add를 사용하고 있습니다. – Unknown
@LalitPoptani logcat 출력을 업데이트했습니다. – WTH