我正在构建我的第一个 android 应用程序，但遇到了一个问题。在应用程序中，我有一个使用 ListView 的搜索功能。在这里，用户可以搜索某个项目并查看它是否存在。这真的很好，我是根据这个教程做的：Android ListView with Search
我的所有项目都在 array.xml 中定义的字符串数组中找到。现在，每个项目都可以是一个或多个集合的一部分。目前我在项目名称旁边显示它包含的集合，如下所示：“ ITEM -> Collection(s) ”。这可行，但并不是一个优雅的选择。我想做的是将项目的名称作为可扩展 ListView 中的 ITEM，并将它所属的集合作为 SUBITEM。因此，我将有 2 个字符串数组，一个用于父项，一个用于子项。
我发现的所有示例都是“手动”填充列表，我无法弄清楚如何将我的项目数组分配给 GROUP 并将我的 COLLECTIONS 数组分配给 CHILDREN。
我不知道我是否解释得足够清楚，但简而言之，它会是这样的：
ITEM_1 = 第一组名称 COLLECTIONS_1 = 第一组的孩子
谢谢！
编辑：好的，设法像我想要的那样创建可扩展视图：
public class Search extends ListActivity {
private String[] l1;
private String[] l2;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
ArrayList<Map<String, String>> list = buildData();
String[] from = { "name", "purpose" };
int[] to = { android.R.id.text1, android.R.id.text2 };
SimpleAdapter adapter = new SimpleAdapter(this, list, android.R.layout.simple_list_item_2, from, to);
setListAdapter(adapter);
}
private ArrayList<Map<String, String>> buildData() {
l1 = getResources().getStringArray(R.array.items);
l2 = getResources().getStringArray(R.array.collections);
Integer i;
int to = l1.length;
ArrayList<Map<String, String>> list = new ArrayList<Map<String, String>>();
for(i=0;i < to;i++){
list.add(putData(l1[i], l2[i]));
}
return list;
}
private HashMap<String, String> putData(String name, String purpose) {
HashMap<String, String> item = new HashMap<String, String>();
item.put("name", name);
item.put("purpose", purpose);
return item;
}
}
现在的问题是，我该如何排序？
您从这里下载源代码（Expandablelistview with searchview in android）
MainActivity.java：
public class MainActivity extends AppCompatActivity {
ExpandableListView ev_list;
List> lv_country = new ArrayList<>();
CustomAdapter customAdapter;
EditText et_search;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
getSupportActionBar().hide();
init();
}
private void init() {
ev_list = (ExpandableListView) findViewById(R.id.ev_list);
et_search = (EditText) findViewById(R.id.et_search);
fn_arraylist();
customAdapter = new CustomAdapter(lv_country, getApplicationContext());
ev_list.setAdapter(customAdapter);
ev_list.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
return true; // This way the expander cannot be collapsed
}
});
for (int i = 0; i < customAdapter.getGroupCount(); i++) {
ev_list.expandGroup(i);
}
et_search.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
if (et_search.getText().toString().length() == 0) {
customAdapter = new CustomAdapter(lv_country, getApplicationContext());
ev_list.setAdapter(customAdapter);
for (int i = 0; i < customAdapter.getGroupCount(); i++) {
ev_list.expandGroup(i);
}
} else {
List> lv_search = new ArrayList<>();
for (int i = 0; i < lv_country.size(); i++) {
List> lv_searchstate = new ArrayList<>();
List> lv_state = (List>) lv_country.get(i).get("State");
for (int j = 0; j < lv_state.size(); j++) {
if (lv_state.get(j).get("Name").toString().toLowerCase().contains(et_search.getText().toString())) {
lv_searchstate.add(lv_state.get(j));
}
}
if (lv_searchstate.size() != 0) {
HashMap hashMap_search = new HashMap<>();
hashMap_search.put("Name", lv_country.get(i).get("Name").toString());
hashMap_search.put("State", lv_searchstate);
lv_search.add(hashMap_search);
}
}
customAdapter = new CustomAdapter(lv_search, getApplicationContext());
ev_list.setAdapter(customAdapter);
for (int i = 0; i < customAdapter.getGroupCount(); i++) {
ev_list.expandGroup(i);
}
}
}
});
}
谢谢！