我正在开发一个Android应用程序，其中包含可扩展的列表视图和顶部的搜索栏。因此，如果我在编辑文本字段中输入任何内容，我希望它过滤可扩展列表。
例如：我在搜索栏中输入“ as ” - ＆gt;该列表应仅显示以下条目：“ as sert”，“b as e”，“c as e”，“ as sembling“等等。
我在互联网上搜了几个小时，但我无法实现这个功能。 所以我真的希望你能帮助我（：
这是我的可扩展列表适配器：
package my.pack;
public class ExpandableListAdapter extends BaseExpandableListAdapter {
@Override
public boolean areAllItemsEnabled() {
return true;
}
private Context context;
private ArrayList<String> groups;
private ArrayList<ArrayList<Product>> children;
public ExpandableListAdapter(Context context, ArrayList<String> groups,
ArrayList<ArrayList<Product>> children) {
this.context = context;
this.groups = groups;
this.children = children;
}
public void addItem(Product product) {
if (!groups.contains(product.getGroup())) {
groups.add(product.getGroup());
}
int index = groups.indexOf(product.getGroup());
if (children.size() < index + 1) {
children.add(new ArrayList<Product>());
}
children.get(index).add(product);
}
public Object getChild(int groupPosition, int childPosition) {
return children.get(groupPosition).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
// Return a child view. You can load your custom layout here.
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
Product product = (Product) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.productinsertchild,
null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tvChild);
tv.setText(" " + product.getpName());
return convertView;
}
public int getChildrenCount(int groupPosition) {
return children.get(groupPosition).size();
}
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
public int getGroupCount() {
return groups.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
// Return a group view. You can load your custom layout here.
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String group = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.productinsertgroup,
null);
}
TextView tv = (TextView) convertView.findViewById(R.id.tvGroup);
tv.setText(group);
return convertView;
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int arg0, int arg1) {
return true;
}
}
在这里我的活动： 请注意，ExpandableListView从在线mysql服务器获取数据。这就是我使用异步任务的原因。
package activities.shop;
public class ProductInsert extends BaseActivity {
public static final String phpServerConnection = "url-to-php-file";
public static final String phpgetGrocery = "url-to-php-file";
static final int MY_DIALOG_ID = 0;
protected static AppPreferences appPrefs;
private getGroceryTask ggt = null;
private ExpandableListAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ExpandableListView listView = (ExpandableListView) findViewById(R.id.listView);
listView.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView arg0, View arg1,
int arg2, int arg3, long arg4) {
Toast.makeText(getBaseContext(), "Child clicked",
Toast.LENGTH_LONG).show();
return false;
}
});
listView.setOnGroupClickListener(new OnGroupClickListener() {
public boolean onGroupClick(ExpandableListView arg0, View arg1,
int arg2, long arg3) {
return false;
}
});
adapter = new ExpandableListAdapter(this, new ArrayList<String>(),
new ArrayList<ArrayList<Product>>());
// Set this blank adapter to the list view
listView.setAdapter(adapter);
ggt = new getGroceryTask(this);
((getGroceryTask) ggt).execute();
}
@Override
public int getContentViewId() {
return R.layout.productinsert;
}
@Override
protected Dialog onCreateDialog(int id) {
ProgressDialog progressDialog = null;
switch (id) {
case MY_DIALOG_ID:
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Aktualisieren...");
break;
default:
progressDialog = null;
}
return progressDialog;
}
final static class getGroceryTask extends
SuperAsyncTask<String, String, Void> {
ProductInsert activity;
InputStream is = null;
String result = "";
public getGroceryTask(BaseActivity activity) {
super(activity, MY_DIALOG_ID); // change your dialog ID here...
this.activity = (ProductInsert) activity; // and your dialog will be
// managed
// automatically!
}
@Override
protected Void doInBackground(String... params) {
appPrefs = new AppPreferences(activity);
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("uEmail", appPrefs
.getUserEmail()));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(phpgetGrocery);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
return null;
}
private Product get(int pid, String pName, String pKat) {
return new Product(pid, pName, pKat);
}
@Override
public void onAfterExecute() {
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
activity.adapter.addItem(get(json_data.getInt("pid"),
json_data.getString("pName"),
json_data.getString("pKat")));
}
activity.adapter.notifyDataSetChanged();
} catch (JSONException e) {
Log.e("log_tag", "Error parsing datauuuuuu " + e.toString());
}
}
}
}
答案 0 :(得分：0)
您可以考虑从CursorTreeAdapter而不是BaseExpandableListAdapter进行扩展 - 这样您就可以覆盖getFilterQueryProvider（并提供您自己的FilterQueryProvider）来查找您正在寻找的功能。当然，这意味着您必须将MySQL数据库中的结果转换为游标，但如果您这样做，则过滤过程会变得更加容易。
否则，您必须覆盖getFilter()并在ListAdapter中提供您自己的Filter - 这并没有太大的不同 - 它有一些更复杂的问题，但您不必添加光标转换层。
在任何情况下，将您自己的textChangedListener添加到过滤器编辑文本以调用过滤器。
答案 1 :(得分：0)
可扩展列表视图的问题在于，如果您有许多与组父项关联的子项，则需要时间....
您可以使用可扩展列表视图中预先填充的项目使用AutoCompleteTextView，以便您可以获得平滑的搜索功能，并允许根据用户选择而不是上述功能刷新列表...您可能会影响使用上述功能的最终用户体验....但是如果你对你的实现如此执着..你可以使用相同的AutoCompleteTextView和onKeyDown功能或textvalidation功能......
查看小工具http://developer.android.com/reference/android/widget/AutoCompleteTextView.html