AutoCompleteTextView建議不彈出

Question

我加入觀的ListView在ListActivity頁眉，膨脹具有AutoCompleteTextView並沒有顯示在輸入文本的建議後。雖然它在正常情況下絕對正常，但在添加到ListView標題時無法正常工作。

header_route.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/header" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     > 
    <TextView 
     android:id="@+id/lblride_From" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/txtFrom" 
     android:layout_alignParentTop="true" 
     android:text="@string/lblride_Route" 
     /> 

    <AutoCompleteTextView 
     android:id="@+id/txtFrom" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_below="@+id/lblride_From" 
     android:layout_marginLeft="20dp" 
     android:layout_marginTop="2dp" 
     android:completionThreshold="1" 
     android:ems="10" 
     android:width="290dp" 
     android:imeOptions="actionGo" 
     android:popupBackground="@android:color/black" > 

     <requestFocus /> 
    </AutoCompleteTextView> 

    <Button 
     android:id="@+id/hdbtnOkRoute" 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/txtFrom" 
     android:layout_below="@+id/txtFrom" 
     android:layout_marginTop="2dp" 
     android:minHeight="40dp" 
     android:text="@string/txtBtnOk" 
     android:width="290dp" /> 

</RelativeLayout> 

public class BusRouteActivity extends ListActivity implements TextWatcher { 

    AutoCompleteTextView actvFrom; 
    Button buttonOK; 
    TextView txtViewRouteItem; 
    ListView lstViewRoute; 
    ArrayAdapter<String> listAdapter; 
    DataBaseHelper databaseHelper; 
    TextView tvFooter; 
    Context appContext; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setTitle(R.string.nameBusRouteActivity); 
     appContext = getApplicationContext(); 
     lstViewRoute = getListView(); 
     LayoutInflater inflater = (LayoutInflater)appContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View view = inflater.inflate(R.layout.header_route, null); 

     DataBaseHelper dbh = new DataBaseHelper(getApplicationContext()); 

     try { 
      dbh.createDataBase(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace();    
     } 

     dbh.openDataBase(); 
     databaseHelper = dbh; 

    actvFrom = (AutoCompleteTextView) view.findViewById(R.id.txtFrom); 
     actvFrom.addTextChangedListener(this); 
     actvFrom.setOnEditorActionListener(actionListener); 
     ArrayAdapter<String> aroutes = new ArrayAdapter<String>(appContext, R.layout.routeitem, dbh.GetRoutes()); 
     actvFrom.setAdapter(aroutes); 

     buttonOK = (Button)view.findViewById(R.id.hdbtnOkRoute); 
     buttonOK.setOnClickListener(OkOnClickListener); 

     tvFooter = new TextView(this); 
     tvFooter.setTextAppearance(getApplicationContext(), R.style.footerStyle); 
     String text = getResources().getString(R.string.footer); 
     tvFooter.setText(Html.fromHtml(text)); 

     listAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.routeitem); 
     lstViewRoute.addHeaderView(view, null, false); 
     lstViewRoute.addFooterView(tvFooter, null, true); 
     lstViewRoute.setClickable(true); 
     lstViewRoute.setSelected(true); 
     lstViewRoute.setAdapter(listAdapter); 
    } 

請讓我知道如果我錯過任何設置？提前致謝。

Answer 1

這裏有一個代碼可以幫助你！

http://www.javatpoint.com/android-autocompletetextview-example