如何在AlertDialog中獲取ListView的元素

-2

我對android比較陌生，而且我被困在這個問題上。我創建了一個啓動對話框的按鈕。 AlertDialog（具體）然後以編程方式創建一個listView併爲其分配一個適配器。現在用戶可以點擊一些元素，並且ListView中的textView元素變爲紅色。然後我存儲被點擊的元素。現在，當我再次創建對話框時，被點擊的相同文本變成白色。如何在AlertDialog中獲取ListView的元素

所以我的問題是，如何事先訪問listView的元素，所以我可以改變以前點擊的項目的顏色。

這是Java代碼：

private void populateListView(String[] els) { 

     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.single_listview_item,R.id.txtitem, els); 
     list = new ListView(this); 
     list.setAdapter(adapter); 


     list.setOnItemClickListener(new AdapterView.OnItemClickListener(){ 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, 
            long id) { 

        ViewGroup vg=(ViewGroup)view; 
        TextView txt=(TextView)vg.findViewById(R.id.txtitem); 

        if(!currentList.isSelected(position)) { 
         txt.setBackgroundResource(R.color.redPastel); 
         currentList.select(position); 
        } 

        else{ 
         txt.setBackgroundResource(R.color.white); 
         currentList.unselect(position); 
        } 

      } 

     }); 

    } 

//the listener for the button 

    public void showDialogListView(View view){ 
     String [] selection = {}; 
     Button buttonUsed = null; 

     switch (view.getId()){ 
      case R.id.cuisineButton: 
       selection = cuisines.getArray(); 
       currentList = cuisines; 
       buttonUsed = (Button) findViewById(R.id.cuisineButton); 
       break; 
      case R.id.mealTimeButton: 
       selection = times.getArray(); 
       currentList = times; 
       buttonUsed = (Button) findViewById(R.id.mealTimeButton); 
       break; 
     } 

     populateListView(selection); 

     AlertDialog.Builder builder=new AlertDialog.Builder(this); 
     builder.setCancelable(true); 
     final Button finalButtonUsed = buttonUsed; 
     builder.setPositiveButton("Select", 
       new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 
         finalButtonUsed.setText(currentList.getSelectionText()); 
        } 
       }); 
     builder.setNegativeButton("Cancel",null); 
     builder.setView(list); 
     AlertDialog dialog=builder.create(); 
     dialog.show(); 

    } 

}

這是單一元素XML的佈局：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:id="@+id/txtitem" 
     android:layout_height="wrap_content" 
     android:layout_width="match_parent" 
     android:textSize="25sp" 
     android:gravity="center" 
     /> 
</LinearLayout>

來源

2016-11-25 F.Slat

保存位置並通過list.getItemAtPosition（） – jfxu

訪問它請參閱http://stackoverflow.com/questions/3888015/androidto-set-an-item-as-selected-wh en-the-listview-打開 – diedu

非常感謝！ –

你可以得到ListView項等作爲

lv_view_task.setOnItemClickListener(new OnItemClickListener() { 

public void onItemClick(AdapterView<?> arg0, View arg1,final int arg2, 
     long arg3) { 
    final View selectedView v = arg1 ; // Save selected view in final variable** 

    AlertDialog.Builder alert=new AlertDialog.Builder(ViewTask.this); 
    alert.setTitle("title stackoverflow"); 
    alert.setIcon(R.drawable.ic_launcher); 

    alert.setPositiveButton("Fix",new OnClickListener() { 

     public void onClick(DialogInterface dialog, int which) { 
      // TODO Auto-generated method stub 
      String str=lv_view_task.getItemAtPosition(arg2).toString(); 
      Toast.makeText(getApplicationContext(), str,Toast.LENGTH_LONG).show(); 
      //Access view object v here 
      TextView label=(TextView) v.findViewById(R.id.label); 
      String xyz = label.getText(); 

     } 
    });

來源

2016-11-25 03:57:53

如何在AlertDialog中獲取ListView的元素

回答

相關問題