Question

大家好我是android的新手我想知道如何使用多个父级实现expandablelistview

实际上我已经创建了一个，但问题是当我点击第二个父级中的某个datachild时它会占用第一个父级的datachild，所以我想要一个更准确的代码。

这是我的代码

package com.guide.directory.school.wcc.schooldirectoryandguidematerialdesign;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class ProgramsOffered extends ActionBarActivity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    public void onBackPressed() {
        Intent intent = new Intent(ProgramsOffered.this, MainActivity.class);
        startActivity(intent);
        super.onBackPressed();
    }

    private void prepareListData() {

        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        listDataHeader.add("Courses");
        listDataHeader.add("WCC College Admision Test");
        listDataHeader.add("WCC ATC Admission Requirements");
        listDataHeader.add("Pricelist of Uniforms");
        listDataHeader.add("Pricelist of Dormitories");

        List<String> courses = new ArrayList<String>();
        List<String> cat = new ArrayList<>();
        List<String> atc = new ArrayList<>();
        List<String> uniform = new ArrayList<>();
        List<String> dorm = new ArrayList<>();

        courses.add("BS Aviation Major in Commercial Flying");
        courses.add("BS Aviation Major in Aviation Management");
        courses.add("BS Aeronautical Engineering");
        courses.add("BS Tourism with Flight Attendant Course");
        courses.add("BS Aircraft Maintenance Technology");
        courses.add("Diploma in Aircraft Maintenance Technology");
        courses.add("Diploma in Avionics Technology");

        cat.add("A. Testing Fee");
        cat.add("B. Test Coverage");
        cat.add("C. Time Coverage");
        cat.add("D. Checking of CAT Paper");
        cat.add("E. Releasing of CAT Result");
        cat.add("F. Schedule of CAT");

        atc.add("Freshmen");
        atc.add("Transferees");

        uniform.add("BS Comfly and AvMgt");
        uniform.add("BS Tourism Mgt");
        uniform.add("AeroEng, AMT, Dip AvTech");

        dorm.add("Hotel");
        dorm.add("Apartment");
        dorm.add("Room");

        listDataChild.put(listDataHeader.get(0), courses);
        listDataChild.put(listDataHeader.get(1), cat);
        listDataChild.put(listDataHeader.get(2), atc);
        listDataChild.put(listDataHeader.get(3), uniform);
        listDataChild.put(listDataHeader.get(4), dorm);


    }

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        expListView = (ExpandableListView) findViewById(R.id.list);
        prepareListData();
        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
        expListView.setAdapter(listAdapter);

        expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                return false;
            }
        });

        expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            int previousGroup = -1;

            public void onGroupExpand(int paramInt) {
                if (paramInt != this.previousGroup)
                    ProgramsOffered.this.expListView.collapseGroup(this.previousGroup);
                this.previousGroup = paramInt;
                Log.d("HAHA", paramInt + "");
            }
        });

        expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {

            }
        });

        expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView paramExpandableListView, View paramView, int paramInt1, int paramInt2, long paramLong) {
                ProgramsOffered.this.listDataHeader.get(paramInt1);
                ProgramsOffered.this.listDataChild.get(Integer.valueOf(paramInt2));
                switch (paramInt2) {
                    default:
                        break;
                    case 0:
                        Intent intent = new Intent(ProgramsOffered.this, Course1.class);
                        startActivity(intent);
                        break;
                    case 1:
                        Intent intent1 = new Intent(ProgramsOffered.this, Course2.class);
                        startActivity(intent1);
                        break;
                    case 2:
                        Intent intent2 = new Intent(ProgramsOffered.this, Course3.class);
                        startActivity(intent2);
                        break;
                    case 3:
                        Intent intent3 = new Intent(ProgramsOffered.this, Course4.class);
                        startActivity(intent3);
                        break;
                    case 4:
                        Intent intent4 = new Intent(ProgramsOffered.this, Course5.class);
                        startActivity(intent4);
                        break;
                    case 5:
                        Intent intent5 = new Intent(ProgramsOffered.this, Course6.class);
                        startActivity(intent5);
                        break;
                    case 6:
                        Intent intent6 = new Intent(ProgramsOffered.this, Course7.class);
                        startActivity(intent6);
                        switch (paramInt2) {
                            default:
                                break;
                            case 0:
                                Intent intent7 = new Intent(ProgramsOffered.this, TestingFee.class);
                                startActivity(intent7);
                                break;
                            case 1:
                                Intent intent8 = new Intent(ProgramsOffered.this, TestCoverage.class);
                                startActivity(intent8);
                        }
                }
                return false;
            }

        });
        expListView.expandGroup(0);

    }


    @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_programs_offered, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case android.R.id.home:
                Intent intent = new Intent(ProgramsOffered.this, MainActivity.class);
                startActivity(intent);
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

在可扩展列表视图中，每个子项都有一个groupPosition和一个childPosition，因此第一组中的第一个子组位于groupPosition 0，childPosition 0.第二组中的第一个子组是groupPosition 1，childPosition 0。 / p>

根据目前设置的方式，在onChildClickListener中，paramInt1是groupPosition，paramInt2是子位置。您正在使用的Switch，Case仅检查paramInt2，在我在第一段中提到的两种情况中，paramInt2都为零。您需要检查哪个组（paramInt1）然后检查该组中的哪个孩子（paramInt2）。

执行此操作的一种方法是使用嵌套的Switch，Cases，因此在伪代码中：

switch(paramInt1) {
    case 0:
        switch(paramInt2) {
            //this would be the first switch you used
                }
      break;
    case 1:
        switch (paramInt2) {
            //this would be the switch for your second group
            }
       break;
       }

如何使用多个父级实现可扩展的列表视图

1 个答案: