【发布时间】：2012-12-04 10:43:36
【问题描述】：
我管理一个 AutoCompleteTextView，根据我输入的 4 个首字母，它应该提供在我的数据库中找到的所有城镇 (ville)。
Async task 运行良好并获得正确的数据。
我的问题是DropDownList 不显示所有项目。 DB 返回的 20 个中通常只有 1、2、3 或 4 个。
所以我想，ACTV 本身应该有一些自动过滤功能！ 我在这里查看了很多关于 SO 的主题，以更新我的代码，但我没有成功.... :-(
我不断收到错误，但不知道到底是什么问题！ :-(
这是我的代码：
class MyActivity extends Activity implements AdapterView.OnItemClickListener
{
static class Ville
{
String id;
String name;
@Override
public String toString() { return this.name; }
};
ArrayAdapter<Ville> villeAdapter;
String villeAdapterFilter;
VilleUpdateTask villeAdapterUpdateTask;
AutoCompleteTextView villeText;
Ville selectedVille;
final TextWatcher textChecker = new TextWatcher() {
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count)
{
MyActivity.this.setAdapterFilter(s.toString());
}
};
public void onCreate(Bundle bundle)
{
super.onCreate(bundle);
setContentView(R.layout.main);
this.villeAdapter = new ArrayAdapter<Ville>(this,android.R.layout.simple_dropdown_item_1line, new Ville[0]);
this.villeText = (AutoCompleteTextView ) findViewById(R.id.villeSelector);
this.villeText.setAdapter(this.villeAdapter);
this.villeText.setThreshold(THRESHOLD_DROPDOWN);
this.villeText.setOnItemClickListener(this);
this.villeText.addTextChangedListener(textChecker);
}
public void onDestroy() { stopVilleAdapterUpdate();
public void setAdapterFilter(String filter)
{
if (filter == null) {
// clearing the adapter
this.villeAdapterFilter = null;
this.villeAdapter.clear();
this.villeAdapter.notifyDataSetChanged();
Log.d("MyActivity","Clearing ville filter !");
} else if (filter.length() > THRESHOLD_QUERY) {
if (this.villeAdapterFilter == null) {
Log.d("MyActivity","Ville Adapter Filter defined to:"+filter);
this.villeAdapterFilter = filter;
startVilleAdapterUpdate();
} else {
Log.d("MyActivity","Already filtered with:"+this.villeAdapterFilter);
}
} else {
Log.d("MyActivity","Resetting filter (not enough data)");
this.villeAdapterFilter = null;
this.villeAdapter.clear();
this.villeAdapter.notifyDataSetChanged();
}
}
public synchronized void onItemClick(ViewAdapter<?> ad, View v, int position, long id)
{
this.selectedVille = this.villeAdapter.getItemAtPosition(position);
Log.d("MyActivity","Ville selected: "+this.selectedVille);
}
public synchronized void startVilleAdapterUpdate()
{
stopVilleAdapterUpdate();
Log.d("MyActivity","Starting Update of Villes with "+this.villeAdapterFilter);
this.villeAdapterUpdateTask = new VilleUpdateTask();
this.villeAdapterUpdateTask.execute(this.villeAdapterFilter);
}
public synchronized void stopVilleAdapterUpdate()
{
if (this.villeAdapterUpdateTask != null) {
Log.d("MyActivity","Stopping current update of villes");
this.villeAdapterUpdateTask.cancel(true);
this.villeAdapterUpdateTask = null;
}
}
public synchronized void onVilleAdapterUpdateResult(Ville[] data)
{
this.villeAdapterUpdateTask = null;
if (data != null) {
Log.d("MyActivity","Received "+data.length+" villes from update task");
this.villeAdapter.clear();
this.villeAdapter.addAll(data);
this.villeAdapter.notifyDataSetChanged(); // mise à jour du drop down...
}
}
class VilleUpdateTask extends AsyncTask<String,Void,Ville[]>
{
public Ville[] doInBackground(String ... filters)
{
ArrayList<Ville> values = new ArrayList<Ville>();
try {
HttpClient httpclient = new DefaultHttpClient();
....
....
for(int i=0;i<json_array.length();i++) {
JSONObject json_ligne = json_array.getJSONObject(i);
try {
Ville v = new Ville();
v.name = json_ligne.getString("NAME_VILLE");
v.id = json_ligne.getString("ID_VILLE");
values.add(v);
} catch (Exception ex) {
Log.w("VilleUpdateTask","Invalid value for Ville at index #"+i,ex);
}
}
} catch (Exception ex) {
Log.e("VilleUpdateTask","Failed to retrieve list of Ville !",ex);
}
return values.toArray(new Ville[values.size()]);
}
public void onPostExecute(Ville[] data)
{
MyActivity.this.onVilleAdapterUpdateResult(data);
}
}
}
编辑 1：是的，抱歉，我的 ACTV 是基本的 TextView，这不是滚动问题，因为在更好的情况下，我可以在列表中看到 10 个项目，最后位置是随机的
编辑 2：您能帮我将现有代码调整为上述 2 个 URL 中的给定解决方案吗？
(1) 根据那个解决方案AutoCompleteTextView - disable filtering
我必须：
创建我的类ClassMyACArrayAdapter，它和给定的一样，只是它的名字改变了
-
从
更改我的声明ArrayAdapter villeAdapter;
到
List<ClassMyACArrayAdapter> villeAdapter;
-
但在 onCreate 中应该用什么替换初始
this.villeAdapter = 新的 ArrayAdapter
(this,android.R.layout.simple_dropdown_item_1line, new Ville[0]);
【问题讨论】：
标签： android autocomplete filtering