它仅显示子项中的一个父项，首先在所有其他父项上单击 expandableListview

Question

我的下面的代码只显示子项中的一个父项，首先单击所有其他父项 expandableListview

    public class AffiliationAdapter extends BaseExpandableListAdapter {
        Context context;
        LayoutInflater inflater;

        private List<String> _listDataHeader; // header titles
        // child data in format of header title, child title
        private ArrayList<HashMap<String, String>> _listDataChild;
        DbFields dbFields = new DbFields();


        public AffiliationAdapter(Context activity, List<String> listDataHeader, ArrayList<HashMap<String, String>> listDataChild) {

            this.context = activity;
            this._listDataHeader = listDataHeader;
            this._listDataChild = listDataChild;
        }


        @Override
        public void registerDataSetObserver(DataSetObserver dataSetObserver) {

        }

        @Override
        public void unregisterDataSetObserver(DataSetObserver dataSetObserver) {

        }

        @Override
        public int getGroupCount() {
            return this._listDataHeader.size();
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return 1;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return this._listDataHeader.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosititon) {
            return this._listDataChild.get(groupPosition).get(childPosititon);
        }

        @Override
        public long getGroupId(int i) {
            return i;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }



        @Override
        public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {


            if (view == null) {
                LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = infalInflater.inflate(R.layout.faq_group_expand, null);
            }

            TextView getFaqAnswer = (TextView) view.findViewById(R.id.answer);

            getFaqAnswer.setTypeface(null, Typeface.BOLD);
            getFaqAnswer.setText((_listDataHeader.get(i)));

            return view;
        }

        @Override
        public int getChildType(int groupPosition, int childPosition)
        {
            int result = 0;
            if (groupPosition == getGroupCount()-1)//logical fail ?
            {
                result = 1;
            }
            return result;

        }



        @Override
        public View getChildView(final int i, int i2, boolean b, View v, ViewGroup viewGroup) {

            if (v==null) {
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = inflater.inflate(R.layout.child_affiliation, null);
                int itemType = getChildType(i, i2);


                LinearLayout layout_about = (LinearLayout) v.findViewById(R.id.layout_about);
                LinearLayout layout_vc = (LinearLayout) v.findViewById(R.id.layout_vc);
                LinearLayout layout_registrar = (LinearLayout) v.findViewById(R.id.layout_registrar);
                LinearLayout layout_examination_controller = (LinearLayout) v.findViewById(R.id.layout_examination_controller);
                LinearLayout layout_link = (LinearLayout) v.findViewById(R.id.layout_link);

                TextView about_detail = (TextView) v.findViewById(R.id.about_detail);
                TextView vc_name = (TextView) v.findViewById(R.id.vc_name);
                TextView vc_Contact = (TextView) v.findViewById(R.id.vc_Contact);
                TextView vc_email = (TextView) v.findViewById(R.id.vc_email);

                TextView registrar_name = (TextView) v.findViewById(R.id.registrar_name);
                TextView registarar_Contact = (TextView) v.findViewById(R.id.registarar_Contact);
                TextView registrar_email = (TextView) v.findViewById(R.id.registrar_email);


                TextView controller_name = (TextView) v.findViewById(R.id.controller_name);
                TextView controller_Contact = (TextView) v.findViewById(R.id.controller_Contact);
                TextView controller_email = (TextView) v.findViewById(R.id.controller_email);
                TextView link = (TextView) v.findViewById(R.id.link);

                about_detail.setText(_listDataChild.get(i2).get(dbFields.AFFILIATION_DESCRIPTION));
                vc_name.setText(_listDataChild.get(i2).get(dbFields.VC_NAME));
                vc_Contact.setText(_listDataChild.get(i2).get(dbFields.VC_PHONE));
                vc_email.setText(_listDataChild.get(i2).get(dbFields.VC_EMAIL));

                registrar_name.setText(_listDataChild.get(i2).get(dbFields.REGISTRAR_NAME));
                registarar_Contact.setText(_listDataChild.get(i2).get(dbFields.REGISTRAR_PHONE));
                registrar_email.setText(_listDataChild.get(i2).get(dbFields.REGISTRAR_EMAIL));

                controller_name.setText(_listDataChild.get(i2).get(dbFields.EXAM_CONTROLLER_NAME));
                controller_Contact.setText(_listDataChild.get(i2).get(dbFields.EXAM_CONTROLLER_PHONE));
                controller_email.setText(_listDataChild.get(i2).get(dbFields.EXAM_CONTROLLER_EMAIL));

                link.setText("Notice Link :" +_listDataChild.get(i2).get(dbFields.AFFILIATION_NOTICE_LINK)+
                        "\n Result Link : "+_listDataChild.get(i2).get(dbFields.AFFILIATION_RESULT_LINK)+
                        " \n Schedule Link :"+_listDataChild.get(i2).get(dbFields.AFFILIATION_SCHEDULE_LINK));




                int grup_pos = (int) getGroupId(i);
                switch (grup_pos) {
                    case 0:
                        layout_link.setVisibility(View.GONE);
                        layout_examination_controller.setVisibility(View.GONE);
                        layout_registrar.setVisibility(View.GONE);
                        layout_vc.setVisibility(View.GONE);
                        layout_about.setVisibility(View.VISIBLE);
                        //   v = inflater.inflate(R.layout.dialog_contact, null);
                        Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                        break;
                    case 1:
                        layout_link.setVisibility(View.GONE);
                        layout_examination_controller.setVisibility(View.GONE);
                        layout_registrar.setVisibility(View.GONE);
                        layout_vc.setVisibility(View.VISIBLE);
                        layout_about.setVisibility(View.GONE);
                        //   v = inflater.inflate(R.layout.item_faq_answer, null);
                        Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        layout_link.setVisibility(View.GONE);
                        layout_examination_controller.setVisibility(View.GONE);
                        layout_registrar.setVisibility(View.VISIBLE);
                        layout_vc.setVisibility(View.GONE);
                        layout_about.setVisibility(View.GONE);
                        //     v = inflater.inflate(R.layout.dialog_contact, null);
                        Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                        break;
    //                case 3:
    //                    layout_link.setVisibility(View.GONE);
    //                    layout_examination_controller.setVisibility(View.GONE);
    //                    layout_registrar.setVisibility(View.GONE);
    //                    layout_vc.setVisibility(View.GONE);
    //                    layout_about.setVisibility(View.GONE);
    //               //     v = inflater.inflate(R.layout.events_items, null);
    //                    Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
    //                    break;
                    case 3:
                        layout_link.setVisibility(View.GONE);
                        layout_examination_controller.setVisibility(View.VISIBLE);
                        layout_registrar.setVisibility(View.GONE);
                        layout_vc.setVisibility(View.GONE);
                        layout_about.setVisibility(View.GONE);
                        //     v = inflater.inflate(R.layout.dialog_program, null);
                        Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                        break;

                    case 4:
                        layout_link.setVisibility(View.VISIBLE);
                        layout_examination_controller.setVisibility(View.GONE);
                        layout_registrar.setVisibility(View.GONE);
                        layout_vc.setVisibility(View.GONE);
                        layout_about.setVisibility(View.GONE);
                        //    v = inflater.inflate(R.layout.dialog_program, null);
                        Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                        break;
                }
            }
            //     v.invalidate();
            return v;
        }


        @Override
        public boolean isChildSelectable(int i, int i2) {
            return true;
        }

        @Override
        public boolean areAllItemsEnabled() {
            return false;
        }

        @Override
        public boolean isEmpty() {
            return false;
        }

        @Override
        public void onGroupExpanded(int i) {
            super.onGroupExpanded(i);


        }

        @Override
        public void onGroupCollapsed(int i) {
            super.onGroupCollapsed(i);
        }

        @Override
        public long getCombinedChildId(long l, long l2) {
            return 0;
        }

        @Override
        public long getCombinedGroupId(long l) {
            return 0;
        }
    }

这是我的主要activity 我的以下代码仅显示子项中的一个父项，首先在所有其他父项上单击 expandableListview 这是主要的 activity

public class AffiliationActivity extends AppCompatActivity {
ExpandableListView expandableListView;
int previousItem = -1;


//variables to holds course entities
// Getting data from


LayoutInflater layoutInflater;
DbHelper dbHelper;
DbFields dbFields;
private ArrayList<HashMap<String, String>> affiliationChildList;
List<String> faqListHeader;
ScrollView scrollView;
LinearLayout mainLayout,header;
CC_Application application;
Intent intent;
String collegeId;
TextView estdDate,setting,location,type,totAffiliation,totStudent,universityName,fax,phone,email,staff_num;


private ArrayList<String> parentItems = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_affiliation);

    //initialise all fields

    expandableListView = (ExpandableListView) findViewById(R.id.expandListViewFaq);
    layoutInflater = getLayoutInflater();
    dbFields = new DbFields();
    dbHelper = new DbHelper(this);
    scrollView = (ScrollView) findViewById(R.id.scroll);
    mainLayout = (LinearLayout) findViewById(R.id.mainLayout);
    header = (LinearLayout) findViewById(R.id.header);
    faqListHeader = new ArrayList<>();
    application= CC_Application.getInstance();

    estdDate = (TextView) findViewById(R.id.estd_date);
    setting = (TextView) findViewById(R.id.setting);
    location = (TextView) findViewById(R.id.location);
    type = (TextView) findViewById(R.id.type);
    totAffiliation = (TextView) findViewById(R.id.total_affiliation);
    totStudent = (TextView) findViewById(R.id.totStudent);
    universityName = (TextView) findViewById(R.id.titleC);
    fax = (TextView) findViewById(R.id.fax);
    phone = (TextView) findViewById(R.id.phone);
    email = (TextView) findViewById(R.id.email);
    staff_num = (TextView) findViewById(R.id.staff_num);

    intent = getIntent();
    if(intent!=null) {
        collegeId = intent.getStringExtra("getCollegeId").toString();
    }


    //set parent name for the child

    parentItems.add("About Us");
    parentItems.add("VC");
    parentItems.add("Registrar");
    parentItems.add("Examination Controller");
    parentItems.add("Links");

    //set actionbar customized logo

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setHomeAsUpIndicator(getResources().getDrawable(R.drawable.college_connect_logo));

    affiliationChildList = application.getAllAffiliationList(collegeId);

    //hold data in expandable listview through adapter
    AffiliationAdapter adapter =  new AffiliationAdapter(this, parentItems, affiliationChildList);

    expandableListView.setAdapter(adapter);

    estdDate.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_FOUNDATION_YEAR));
    setting.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_SETTING));
    universityName.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_NAME));
    type.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_TYPE));
    totAffiliation.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_AFFILIATED_COLLEGE_NUMBER));
    totStudent.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_ENROLLED_STUDENTS));
    location.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_ADDRESS));
    fax.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_FAX));
    phone.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_PHONE));
    email.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_EMAIL));
    staff_num.setText(affiliationChildList.get(0).get(dbFields.AFFILIATION_ACADEMIC_STAFF_NUMBER));

    expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        @Override
        public void onGroupExpand(int groupPosition) {
            if (groupPosition != previousItem){
                expandableListView.collapseGroup(previousItem);
                previousItem = groupPosition;
                mainLayout.setVisibility(View.GONE);

            }
            else{
                expandableListView.collapseGroup(groupPosition);
                previousItem = -1;
                mainLayout.setVisibility(View.VISIBLE);

            }
        }
    });

    // Listview Group collasped listener
    expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

        @Override
        public void onGroupCollapse(int groupPosition) {
            mainLayout.setVisibility(View.VISIBLE);


            Toast.makeText(getApplicationContext(),"Group Collapsed",Toast.LENGTH_SHORT).show();

        }
    });

}



@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_affiliation, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

包括主要activity。

Answer 1

我认为你必须通过适当的 child 尺寸而不是 1。一个小的变化：

发件人：

@Override
    public int getChildrenCount(int groupPosition) {
        return 1;
    }

到

@Override
    public int getChildrenCount(int groupPosition) {
        return _listDataChild .size();
    }

编辑

当你得到 child 的时候。

发件人：

 @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(groupPosition).get(childPosititon);
    }

收件人：

试一试（不确定）：

 @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(childPosititon);
    }

Answer 2

我想在你的 getChildView() 方法中，你已经在一个 if 条件下编写代码，即 if(v==null)，只需在 if 中编写初始化代码并将数据分配给视图，在 if 条件之外编写该代码.

因为当你点击下一个 header(parent) 时不会膨胀新的视图，因为这次视图将不为空。

它仅显示子项中的一个父项，首先在所有其他父项上单击 expandableListview

it shows only one parents item in child which is clicked first on all other parent item for expandableListview

android

expandablelistview

expandablelistadapter