[我正在为Android创建程序,在应用中,我将ExpandableListview与BaseExpandableListViewAdapter一起使用,默认情况下,此适配器使用一个TextView,我想在子listItem上创建一些(两个或三个)TextView,请帮助我提供代码,在活动中写些什么?
XML布局listitem子文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical">
<TextView
android:id="@+id/lblListItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"
android:textSize="15dip" />
<TextView
android:id="@+id/lblListItem2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"
android:textSize="15dip" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
适配器的某些代码:
@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);
TextView txtListChild2 = (TextView) convertView.findViewById(R.id.lblListItem2);
txtListChild2.setText(childText2);
return convertView;
}
此时准备数据列表:
private void prepareListData() {
listDataHeader = new ArrayList<>();
listDataChild = new HashMap<>();
listDataHeader.add(getResources().getString(R.string.bstart_ver));
listDataHeader.add(getResources().getString(R.string.bstart_op));
List<String> Header1 = new ArrayList<>();
Header1.add(getResources().getString(R.string.bstart_string1));
Header1.add(getResources().getString(R.string.bstart_string2));
Header1.add(getResources().getString(R.string.bstart_string3));
List<String> Header2 = new ArrayList<>();
Header2.add(getResources().getString(R.string.bstart_string4));
Header2.add(getResources().getString(R.string.bstart_string5));
Header2.add(getResources().getString(R.string.bstart_string6));
Header2.add(getResources().getString(R.string.bstart_string7));
Header2.add(getResources().getString(R.string.bstart_string8));
listDataChild.put(listDataHeader.get(0), Header1);
listDataChild.put(listDataHeader.get(1), Header2);
}
设置适配器:
private ExpandableListAdapter listAdapter;
private ExpandableListView expListView;
private List<String> listDataHeader;
private HashMap<String, List<String>> listDataChild;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View cpf = inflater.inflate(R.layout.checklist_bstart, container, false);
expListView = cpf.findViewById(R.id.lv_bstart);
prepareListData();
listAdapter = new ExpandableListAdapter(getActivity(), listDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
return cpf;
}
所以要像这样准备数据列表和setAdapter:
private ExpandableListAdapter listAdapter;
private ExpandableListView expListView;
private List<String> listDataHeader;
private HashMap<String, List<String>> listDataChild1, listDataChild2;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View cpf = inflater.inflate(R.layout.checklist_bstart, container, false);
expListView = cpf.findViewById(R.id.lv_bstart);
prepareListData();
listAdapter = new ExpandableListAdapter(getActivity(), listDataHeader, listDataChild1, listDataChild2);
expListView.setAdapter(listAdapter);
return cpf;
}
private void prepareListData() {
listDataHeader = new ArrayList<>();
listDataChild1 = new HashMap<>();
listDataHeader.add(getResources().getString(R.string.bstart_ver));
listDataHeader.add(getResources().getString(R.string.bstart_op));
List<String> Header1 = new ArrayList<>();
Header1.add(getResources().getString(R.string.bstart_string1));
Header1.add(getResources().getString(R.string.bstart_string2));
Header1.add(getResources().getString(R.string.bstart_string3));
List<String> Header12 = new ArrayList<>();
Header12.add(getResources().getString(R.string.bstart_string4));
Header12.add(getResources().getString(R.string.bstart_string5));
Header12.add(getResources().getString(R.string.bstart_string6));
List<String> Header2 = new ArrayList<>();
Header2.add(getResources().getString(R.string.bstart_string4));
Header2.add(getResources().getString(R.string.bstart_string5));
Header2.add(getResources().getString(R.string.bstart_string6));
Header2.add(getResources().getString(R.string.bstart_string7));
Header2.add(getResources().getString(R.string.bstart_string8));
List<String> Header22 = new ArrayList<>();
Header22.add(getResources().getString(R.string.bstart_string1));
Header22.add(getResources().getString(R.string.bstart_string2));
Header22.add(getResources().getString(R.string.bstart_string3));
Header22.add(getResources().getString(R.string.bstart_string7));
Header22.add(getResources().getString(R.string.bstart_string8));
listDataChild1.put(listDataHeader.get(0), Header1);
listDataChild1.put(listDataHeader.get(1), Header2);
listDataChild2.put(listDataHeader.get(0), Header1);
listDataChild2.put(listDataHeader.get(1), Header2);
}
并像这样修改适配器构造函数和getChildView:
Context _context; List<String> listDataHeader; HashMap<String, List<String>> listDataChild1, listDataChild2; public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listDataChild1, HashMap<String, List<String>> listDataChild2) { _context = context; this.listDataHeader = listDataHeader; this.listDataChild1 = listDataChild1; this.listDataChild2 = listDataChild2; } @Override public View getChildView(int groupPosition, int childPosition, boolean b, View convertView, ViewGroup viewGroup) { String childText = (String) getChild(groupPosition, childPosition); String childText2 = listDataChild2.get(getGroup(groupPosition)).get(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); TextView txtListChild2 = (TextView) convertView.findViewById(R.id.lblListItem2); txtListChild2.setText(childText2); return convertView; }
您可以执行类似的操作来制作第三个列表。要记住的一件非常重要的事情是,第二个/第三个列表的大小绝对不能小于主列表的大小,否则会导致INDEX_OUT_OF_BOUND错误[listDataChild2.get(getGroup(groupPosition))。get(childPosition)其中childPosition] >由主列表的大小限制]。对于我在上面的注释中提到的链接,使用POJO类代替List和HashMaps。那可能是一个更好的方法。
希望有帮助!