[英]Android Search Expandable ListView
我在構建我的第一個 android 應用程序時遇到了問題。 在應用程序中,我有一個使用 ListView 的搜索 function。 用戶可以在這里搜索某個項目並查看它是否存在。 這非常有效,我是根據本教程完成的: Android ListView with Search
我的所有項目都在 array.xml 中定義的字符串數組中找到。 現在,每個項目都可以是一個或多個 collections 的一部分。目前我顯示 collections 它包含在項目名稱旁邊,如下所示:“ ITEM -> Collection(s) ”。 這可行,但並不是真正優雅的選擇。 我想要做的是將項目的名稱作為可擴展 ListView 中的 ITEM,並將它所屬的 collections 作為 SUBITEM。 因此,我會有 2 個字符串 arrays,一個用於父項,一個用於子項。
我發現的所有示例都是“手動”填充列表,我無法弄清楚如何將我的 ITEMS 數組分配給 GROUP 並將我的 COLLECTIONS 數組分配給 CHILDREN。
我不知道我是否解釋得足夠清楚,但簡而言之,它會是這樣的:
ITEM_1 = 第一組名稱 COLLECTIONS_1 = 第一組的孩子
謝謝!
編輯:好的,設法像我想要的那樣創建可擴展視圖:
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;
}
}
現在的問題是,我該如何排序?
你從這里下載源代碼( Expandablelistview with searchview in android )
主活動.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);
}
}
}
});
}
謝謝!
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