В моем приложении у меня есть SearchView
, который при нажатии открывается ExpandableListView
внутри Fragment
, в котором отображаются некоторые результаты поиска. Теперь у меня есть проблема, что каждый раз я нажимаю на searchIcon, когда приложение выходит из строя.Системные службы недоступны для деятельности до onCreate() в расширяемом ListView
MainActivity.Java:
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener
{
private ExpListAdapter listAdapter;
private ExpandableListView expList;
private ArrayList<parentClass> parentList = new ArrayList<>();
private boolean b = true;
sql sqlo = new sql();
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Intent sIntent = getIntent();
if (Intent.ACTION_SEARCH.equals(sIntent.getAction())) {
String query = sIntent.getStringExtra(SearchManager.QUERY);
}}
public void searchClick(MenuItem item){
Fragment frag = new Results();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.FragFaecher,frag).commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setIconifiedByDefault(false);
searchView.setOnQueryTextListener(this);
searchView.addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {
@Override
public void onViewAttachedToWindow(View v) {
}
@Override
public void onViewDetachedFromWindow(View v) {
Fragment frag = new FaecherFrag();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.FragFaecher,frag).commit();
}
});
return true;
}
public void displayList(ExpandableListView expList){
if(b){populateList();}
listAdapter = new ExpListAdapter(MainActivity.this,parentList);
expList.setAdapter(listAdapter);
b = false;
}
private void populateList(){
String[] cThema = sqlo.getAlleThemen(this);
String[] cFormel = sqlo.getAlleFormeln(this);
int cThemaLength = cThema.length;
int cFormelLength = cFormel.length;
childClass Child;
ArrayList<childClass> childList = new ArrayList<>();
for (int i=0; i<cThemaLength;i++){Child = new childClass(cThema[i]);childList.add(Child);}
parentClass Parent = new parentClass("Themen",childList);
parentList.add(Parent);
childList = new ArrayList<>();
for (int i=0;i<cFormelLength;i++){Child = new childClass(cFormel[i]);childList.add(Child);}
Parent = new parentClass("Formeln",childList);
parentList.add(Parent);
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String query) {
return false;
}
}
ExpListAdapter.Java:
public class ExpListAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<parentClass> parentList;
private ArrayList<parentClass> originalList;
public ExpListAdapter(Context context, ArrayList<parentClass> parentList){
this.context = context;
this.parentList = new ArrayList<>();
this.parentList.addAll(parentList);
this.originalList = new ArrayList<>();
this.originalList.addAll(parentList);
}
@Override
public int getGroupCount() {
return parentList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
ArrayList<childClass> childList = parentList.get(groupPosition).getChildList();
return childList.size();
}
@Override
public Object getGroup(int groupPosition) {
return parentList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
ArrayList<childClass> childList = parentList.get(groupPosition).getChildList();
return childList.get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
childClass child = (childClass) getChild(groupPosition,childPosition);
if (convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.child_row,null);
}
TextView name = (TextView) convertView.findViewById(R.id.name);
name.setText(child.getName().trim());
return convertView;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup Parent) {
parentClass parent = (parentClass) getGroup(groupPosition);
if(convertView == null){
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.parent_row,null);
}
TextView heading = (TextView) convertView.findViewById(R.id.heading);
heading.setText(parent.getName().trim());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public void filterData(String query){
}
}
Фрагмент:
public class Results extends Fragment {
ExpandableListView expList;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_results, container, false);
return rootView;
}
public void onStart(){
super.onStart();
expList = (ExpandableListView) getView().findViewById(R.id.expList);
MainActivity ma = new MainActivity();
ma.displayList(expList);
}
}
я го e Error "java.lang.IllegalStateException: системные службы, недоступные для операций до onCreate()" в методе getGroupView(). Но если я не ошибаюсь, я уже назвал onCreate моей MainActivity. Итак, почему возникает эта ошибка?
FATAL ИСКЛЮЧЕНИЕ: главный процесса: formelhelfer5_10.formelhelfer5_10, PID: 2301 java.lang.IllegalStateException: Системные сервисы не доступны для деятельности до OnCreate() в android.app.Activity.getSystemService (Activity.java : 5581) на formelhelfer5_10.formelhelfer5_10.ExpListAdapter.getGroupView (ExpListAdapter.java:86) на android.widget.ExpandableListConnector.getView (ExpandableListConnector.java:446) на android.widget.AbsListView.obtainView (AbsListView.java:2360) на android.widget.ListView.measureHeightOfChildren (ListView.java:1326) на android.widget.ListView.onMeasure (ListView.java:1233) на android.view.View.measure (View.java:19731) на android .view.ViewGroup.measureChildWithMargins (ViewGroup.java:6120) на android.widget.LinearLayout.measureChildBeforeLayout (LinearLayout.java:1464) на android.widget.LinearLayout.measureVertical (LinearLayout.java:758) в android.widget .LinearLayout.onMeasure (LinearLayout.java:640) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (Просмотреть Group.java:6120) на android.widget.FrameLayout.onMeasure (FrameLayout.java:185) на android.view.View.measure (View.java:19731) на android.widget.RelativeLayout.measureChildHorizontal (RelativeLayout. java: 715) на android.widget.RelativeLayout.onMeasure (RelativeLayout.java:461) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup.java: 6120) на android.support.design.widget.CoordinatorLayout.onMeasureChild (CoordinatorLayout.java:668) на android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild (HeaderScrolling ViewBehavior.java:90) at android.support.design.widget.AppBarLayout $ ScrollingViewBehavior.onMeasureChild (AppBarLayout.java:1192) at android.support.design.widget.CoordinatorLayout.onMeasure (CoordinatorLayout.java: 733) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:6120) на android.widget.FrameLayout.onMeasure (FrameLayout.java: 185) на android.support.v7.widget.ContentFrameLayout.onMeasure (ContentFrameLayout.java:135) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup. java: 6120) на android.widget.LinearLayout.measureChildBeforeLayout (LinearLayout.java:1464) на android.widget.LinearLayout.measureVertical (LinearLayout.java:758) на android.widget.LinearLayout.onMeasure (LinearLayout.java:640) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:6120) на android .widget.FrameLayout.onMeasure (FrameLayout.java:185) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:6120) на android.widget .LinearLayout.measureChildBeforeLayout (LinearLayout.java:1464) на android.widget.LinearLayout.measureVertical (LinearLayout.java:758) на android.widget.LinearLayout.onMeasure (Linea rLayout.java:640) на android.view.View.measure (View.java:19731) на android.view.ViewGroup.measureChildWithMargins (ViewGroup.java:6120) на android.widget.FrameLayout.onMeasure (FrameLayout. java: 185) at com.android.internal.policy.DecorView.onMeasure (DecorView.java:687) на android.view.View.measure (View.java:19731) на android.view.ViewRootImpl.performMeasure (ViewRootImpl.java:2271) в android.view.ViewRootImpl.measureHierarchy (ViewRootImpl.java:1358) на android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:1607) на android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1246) на android.view.ViewRootImpl $ TraversalRunnable.run (ViewRootImpl.java:6301) на android.view.Choreographer $ CallbackRecord.run (Choreographer.java:871) на android.view.Choreographer.doCallbacks (Хореограф.java:683) на android.view.Choreographer.doFrame (Хореограф.java:619) на android.view.Choreographer $ FrameDisplayEventReceiver.run (Хореограф.java:857) на android.os.Handler.handleCallback (Handler.java:751) 09-06 13: 13: 20.688 2301-2301/formelhelfer5_10.formelhelfer5_10 E/AndroidRuntime: at android.os.Handler.dispatchMessage (Handler.java: 95) на android.os.Looper.loop (Looper.java:154) на android.app.ActivityThread.main (ActivityThread.java:6077) на java.lang.reflect.Method.invoke (родной метод) at com. android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main (ZygoteInit.Java: 755)
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