java - 单击可扩展 ListView 中的子项时如何在另一个 Activity 中打开 ListView

Question

我正在为我的学校开发一个应用程序。它应该包含该机构提供的每门类(class)的讲义。现在该机构中有三所不同的学校，每所学校至少有四个系，所以我的主要 Activity 有一个可扩展的 ListView ，当单击任何学校时它会显示不同的系。

我希望能够在单击特定子项(部门)时在 ListView 中打开一个新 Activity ，其中填充了该部门提供的类(class)。此外，当打开新的类(class)列表 Activity 时，用户应该能够在另一个 Activity 中查看该类(class)的讲义，而无需为每个部门和类(class)创建 Activity 和布局。

这是我的主要 Activity

public class MainActivity extends Activity {

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

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

        // get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                // Toast.makeText(getApplicationContext(),
                // "Group Clicked " + listDataHeader.get(groupPosition),
                // Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();
            }
        });

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

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                        listDataHeader.get(groupPosition)).get(
                                        childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("School Of Applied Science");
        listDataHeader.add("School Of Business And Management Studies");
        listDataHeader.add("School Of Engineering");

        // Adding child data
        List<String> schoolOfAppliedScience = new ArrayList<String>();
        schoolOfAppliedScience.add("Computer Science");
        schoolOfAppliedScience.add("Statistics");
        schoolOfAppliedScience.add("Science Laboratory Technology");
        schoolOfAppliedScience.add("Hotel Catering And Institutional Management");
        schoolOfAppliedScience.add("Fashion Design And Textiles");

        List<String> BAMS = new ArrayList<String>();
        BAMS.add("Secretaryship And Management Studies");
        BAMS.add("Marketing");
        BAMS.add("Accounting");
        BAMS.add("Purchasing And Supply");

        List<String> schOfEngineering = new ArrayList<String>();
        schOfEngineering.add("Electrical Engineering");
        schOfEngineering.add("Automotive Engineering");
        schOfEngineering.add("Building Technology");
        schOfEngineering.add("Civil Engineering");

        listDataChild.put(listDataHeader.get(0), schoolOfAppliedScience); // Header, Child data
        listDataChild.put(listDataHeader.get(1), BAMS);
        listDataChild.put(listDataHeader.get(2), schOfEngineering);
    }
}

这是我的适配器类

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpandableListAdapter(Context context, List<String> listDataHeader,
            HashMap<String, List<String>> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

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

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

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

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

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

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

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}

Answer 1

    // Listview on child click listener
    expListView.setOnChildClickListener(new OnChildClickListener() {

        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {
            // TODO Auto-generated method stub

if (groupPosition == 0) {

      if (childPosition == 0)
         {
            Intent c = new Intent(getApplicationContext(),ComputerScience.class);
            startActivity(c);
         }
      if (childPosition == 1) {
            Intent c = new Intent(getApplicationContext(), Statistics.class);
            startActivity(c);
        }
        if (childPosition == 2) {
            Intent c = new Intent(getApplicationContext(), ScienceLaboratoryTechnology.class);
            startActivity(c);
        }
        if (childPosition == 3) {
            Intent c = new Intent(getApplicationContext(),HotelCateringAndInstitutionalManagement.class);
            startActivity(c);
        }
        if (childPosition == 4) {
            Intent c = new Intent(getApplicationContext(),FashionDesignAndTextiles.class);
            startActivity(c);
        }
    }

   if (groupPosition == 1) {

      if (childPosition == 0)
         {
            Intent c = new Intent(getApplicationContext(),SecretaryshipAndManagementStudies.class);
            startActivity(c);
         }
      if (childPosition == 1) {
            Intent c = new Intent(getApplicationContext(), Marketing.class);
            startActivity(c);
        }
        if (childPosition == 2) {
            Intent c = new Intent(getApplicationContext(), PurchasingAndSupply.class);
            startActivity(c);
        }
        if (childPosition == 3) {
            Intent c = new Intent(getApplicationContext(),HotelCateringAndInstitutionalManagement.class);
            startActivity(c);
        }

    }
    if (groupPosition == 2) {
        if (childPosition == 0) {
            Intent c = new Intent(getApplicationContext(), AutomotiveEngineering.class);
            startActivity(c);
        }
        if (childPosition == 1) {
            Intent c = new Intent(getApplicationContext(), BuildingTechnology.class);
            startActivity(c);
        }
        if (childPosition == 2) {
            Intent c = new Intent(getApplicationContext(), CivilEngineering.class);
            startActivity(c);
        }

    }
    return false;
}
 });