在列表視圖中的多選擇

Question

我已經使用陣列適配器創建了簡單的多選列表視圖。我想設置背景顏色特定列表項。但是，假設我選擇了2項均值設置背景，並且還自動設置了12位和22位。請提出我的問題。

代碼黑色。

public class MainActivity extends Activity { 

ListView lvCountry; 

ArrayList<Integer> list = new ArrayList<Integer>(); 
String[] country = { "India", "USA", "Russsia", "China", "Pakistan", 
     "Canada", "UK", "arcot", "vellore", "gudiyattam", "arani", 
     "palani", "chennai", "padi", "velacherry", "ambattur", 
     "ambatttur ot", "maduravoyal", "guindy" }; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    lvCountry = (ListView) findViewById(R.id.listView1); 
    // Array adapter 
    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
      MainActivity.this, android.R.layout.simple_list_item_1, country); 
    lvCountry.setAdapter(arrayAdapter); 

    // list selection part 
    lvCountry.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, 
       int position, long arg3) { 
      // color selection select item 
      arg1.setBackgroundColor(Color.GRAY); 
     } 
    }); 
}} 

Answer 1

實際上什麼問題是，當你刷卡的ListView的項目是shuffling.to避免這個問題放在列表視圖中滾動視圖。如果你想要我可以提供的代碼示例。

Answer 2

創建您自己的適配器，其中每個項目具有「選定」標誌，默認情況下已清除。點擊給定項目的監聽器設置標誌並強制重畫。你應該使用RecuclerView，因爲它工作得更快。當視圖充氣，檢查選擇標誌，並設置背景相應

Answer 3

XML文件

 <ScrollView 
      android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginBottom="5dp" 
    android:scrollbars="none" 
    android:visibility="gone"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical"> 

     <ListView 

      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_margin="1dp" 
      android:scrollbars="none" 
      android:visibility="visible" /> 
    </LinearLayout> 

</ScrollView> 

Java類

listview.setAdapter(agentRequestAdapter); 

    setListViewHeightBasedOnChildren(lvAgntRqstView); 
     //////////////////////////// 

    private static void setListViewHeightBasedOnChildren(ListView myListView) { 
    try { 
     ListAdapter myListAdapter = myListView.getAdapter(); 
     if (myListAdapter == null) { 
      //do nothing return null 
      return; 
     } 
     //set listAdapter in loop for getting final size 
     int totalHeight = 0; 
     for (int size = 0; size < myListAdapter.getCount(); size++) { 
      View listItem = myListAdapter.getView(size, null, myListView); 
      listItem.measure(0, 0); 
      totalHeight += listItem.getMeasuredHeight(); 
     } 
     //setting listview item in adapter 
     ViewGroup.LayoutParams params = myListView.getLayoutParams(); 
     params.height = totalHeight + (myListView.getDividerHeight() * (myListAdapter.getCount() - 1)); 
     myListView.setLayoutParams(params); 
     // print height of adapter on log 
     Log.i("height of listItem:", String.valueOf(totalHeight)); 


    } catch (NullPointerException e) { 

    } 
} 

Answer 4

在本答案由bhatt4982，您可以設置屬性，使選項可用於選擇列表中的多個條目：

首先，您可以在列表視圖本身中設置像本示例中的那樣

listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
    listView.setItemCanFocus(false); 

其次，您可以在佈局或layout_simple_list_item_1.xml中聲明它。 例如：

<ListView 
    ... 
    android:background="@drawable/your_drawable" 
    android:checkMark="?android:attr/listChoiceIndicatorMultiple"/> 

然後你可以在你的自定義drawable中設置背景。

Source