我正在為 android 創(chuàng)建一個(gè)程序，在應(yīng)用程序中，我使用 ExpandableListview 和 BaseExpandableListViewAdapter，默認(rèn)情況下此適配器使用一個(gè) TextView，我想在子 listItem 上創(chuàng)建一些（兩個(gè)或三個(gè)）TextView，請(qǐng)幫助我編寫(xiě)代碼，該怎么辦寫(xiě)在活動(dòng)中？XML 布局列表項(xiàng)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>來(lái)自適配器的一些代碼：@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); }
1 回答
慕田峪9158850
TA貢獻(xiàn)1794條經(jīng)驗(yàn) 獲得超8個(gè)贊
最簡(jiǎn)單的方法是讓適配器占用更多列表。
因此，像這樣準(zhǔn)備 datalists 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);
}
并像這樣修改適配器構(gòu)造函數(shù)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;
}
您可以執(zhí)行類(lèi)似的操作來(lái)制作第三個(gè)列表。要記住的一件非常重要的事情是，第二個(gè)/第三個(gè)列表的大小決不能小于主列表，否則會(huì)導(dǎo)致 INDEX_OUT_OF_BOUND 錯(cuò)誤 [listDataChild2.get(getGroup(groupPosition)).get(childPosition) 其中 childPosition 的邊界為主列表的大小]。
對(duì)于我在上面評(píng)論中提到的鏈接，使用 POJO 類(lèi)而不是 List 和 HashMap。這可能是一個(gè)更好的方法。
希望有幫助！
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