Android的ExpandableListView单选择复选框在ChildView [英] Android ExpandableListView with single choice CheckBox at ChildView

问题描述

朋友，

我试图写一个ExpandableListView它使用单一的选择复选框在ChildView。 而且我不知道如何设置ExpandableListView其他复选框为假的OnChildClickListener（）。这是我的code：

  ExpListView.setOnChildClickListener（新OnChildClickListener（）{

            @覆盖
            公共布尔onChildClick（ExpandableListView父，视图V，
                    INT groupPosition，诠释childPosition，长ID）{
                复选框CB =（复选框）v.findViewById（R.id.checkbox）;
                如果（cb.isChecked（））{

                } 其他 {
                    cb.setChecked（真正的）;
                    //这里不知何故，我必须将所有其他复选框为false。
                            //可能吗？
                }
                返回false;
            }
   }）;
 

下面是ChildView的XML：

 ＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
              机器人：layout_width =match_parent
              机器人：layout_height =match_parent
              机器人：方向=横向＆GT;

  ＆LT;的TextView
     机器人：ID =@ + ID / textChild
     机器人：layout_width =WRAP_CONTENT
     机器人：layout_height =40dp
     机器人：layout_marginLeft =20dp
     机器人：layout_marginTop =20dp
     机器人：文字颜色=@机器人：彩色/白
     机器人：layout_weight =1
     /＆GT;

＆LT;复选框机器人：ID =@ + ID /复选框
      机器人：layout_width =WRAP_CONTENT
      机器人：layout_height =WRAP_CONTENT
      机器人：可聚焦=假
      机器人：可点击=假
      机器人：layout_gravity =右
      机器人：能见度=看见
/＆GT;

＆LT; / LinearLayout中＆GT;
 

解决方案

如果你想只能选择一个复选框，你可以存储选中的复选框中的一个变量复选框checkedBox; 。当复选框点击，你可以做线沿线的东西

  @覆盖
        公共布尔onChildClick（ExpandableListView父，视图V，
                INT groupPosition，诠释childPosition，长ID）{
            复选框最后= checkedBox //定义为在适配器场/片段
            复选框电流=（复选框）v.findViewById（R.id.checkbox）;

            last.setCheked（假）; //取消选中previous，检查当前
            current.setChecked（真正的）; //并交换变量，使得
            checkedBox =电流; //最近点击'checkedBox`

            返回false;
        }
 

虽然，我不知道这是否会与机器人查看回收系统，但它是值得一试。

如果您需要多个选择，你可以展开 checkedBox 到名单，其中，复选框＆GT; 和迭代它每次你需要取消选中框。

如果你需要存储一些额外的数据（你很可能需要），你可以做一个holder类，如：

 类CheckBoxHolder {

    私人复选框复选框：
    私人诠释身份证;

    公共CheckBoxHolder（复选框CB，INT ID）{
        this.checkBox = CB;
        this.id = ID;
    }
    // getter和/或setter等。
}
 

Friends,

I am trying to write a ExpandableListView which use single choice checkboxes at ChildView. And I can't understand how to set other CheckBoxes to "false" in OnChildClickListener() of ExpandableListView. Here is my code:

 ExpListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                CheckBox cb = (CheckBox) v.findViewById(R.id.checkbox);
                if (cb.isChecked()) {           

                } else {
                    cb.setChecked(true);
                    //Here somehow I must set all other checkboxes to false.
                            //Is it possible?
                }
                return false;
            }
   });

here is xml of ChildView :

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="horizontal">

  <TextView
     android:id="@+id/textChild"
     android:layout_width="wrap_content"
     android:layout_height="40dp"
     android:layout_marginLeft="20dp"
     android:layout_marginTop="20dp"
     android:textColor="@android:color/white"
     android:layout_weight="1"
     />

<CheckBox android:id="@+id/checkbox" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:focusable="false" 
      android:clickable="false" 
      android:layout_gravity="right" 
      android:visibility="visible"
/> 

</LinearLayout>

解决方案

If you want to only be able to select one checkbox, you could store the checked checkbox in a variable CheckBox checkedBox;. When a CheckBox is clicked, you could do something along the lines of

@Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {
            CheckBox last = checkedBox  //Defined as a field in the adapter/fragment
            CheckBox current = (CheckBox) v.findViewById(R.id.checkbox);

            last.setCheked(false);    //Unchecks previous, checks current
            current.setChecked(true); // and swaps the variable, making 
            checkedBox = current;     // the recently clicked `checkedBox`

            return false;
        }

Though, I'm not sure if this will work with Androids view recycle system, but it's worth a shot.

If you need multiple choices, you could expand the checkedBox into a List<CheckBox>, and iterate over it each time you need to uncheck boxes.

If you need to store some additional data (which you most likely need to), you could make a holder class, e.g.

class CheckBoxHolder{

    private CheckBox checkBox:
    private int id;

    public CheckBoxHolder(CheckBox cb, int id){
        this.checkBox = cb;
        this.id = id;
    }
    // Getter and/or setter, etc. 
}

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