突出显示在扩展列表中选择项目(Highlight for selected item in expa

2019-06-23 23:01发布

我有一个布局,我在左边片段可扩展列表和右侧的细节片段。 这一切工作正常。

现在我想以表明正在对剩下什么项目它的右边显示的细节,在这里我有一个问题。

在一个正常的列表视图我已经通过设置选择模式列表视图单,然后使用基于所述“激活”状态的状态可拉伸实现这一点。 当我点击该项目时,背景设置为我选择的颜色,并保持这种方式,直到我在列表中选择另一个项目。

我试图将其应用到我的列表视图可扩展的,这是/是一个令人沮丧的失败。 没有错误,但所选择的项目没有保持它的颜色状态。 我不知道如果我不为它设置正确的选择模式(我已经试过了在布局文件以及编程,它似乎并没有发挥作用),或者将它指向错误的事情(不知道如何可以,但...)

任何帮助/指针赞赏(即使它是在一个完全不同的方向)。

目前大多数的故障:

可扩展列表视图代码

private void fillData(String group, String child) {
    ExpandableListView lv;
    mGroupsCursor = mDbHelper.fetchGroup(group);
    getActivity().startManagingCursor(mGroupsCursor);
    mGroupsCursor.moveToFirst();
    lv = (ExpandableListView) getActivity().findViewById(R.id.explist);
    lv.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);        

    mAdapter = new MyExpandableListAdapter(mGroupsCursor, getActivity(),
            R.layout.explistlayout,
            R.layout.explistlayout,
            new String[] { "_id" },
            new int[] { android.R.id.text1 },
            new String[] { child },
            new int[] { android.R.id.text1 });
    lv.setAdapter(mAdapter);
    registerForContextMenu(lv);

    lv.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { 
        @Override 
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)  
        { 
            mRowId  = id;
            EventDisplayFragment eventdisplay = new EventDisplayFragment();
            getFragmentManager().beginTransaction().replace(R.id.rightpane, eventdisplay).commit();
            return true; 
        } 
        }); 
}

public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {

    public MyExpandableListAdapter(Cursor cursor, Context context,
            int groupLayout, int childLayout, String[] groupFrom,
            int[] groupTo, String[] childrenFrom, int[] childrenTo) {
        super(context, cursor, groupLayout, groupFrom, groupTo,
                childLayout, childrenFrom, childrenTo);
    }
    @Override
    protected Cursor getChildrenCursor(Cursor groupCursor) {
        Cursor childCursor = mDbHelper.fetchChildren(mGroup, groupCursor
                .getString(groupCursor
                        .getColumnIndex(AttendanceDB.EVENT_ROWID)));
        getActivity().startManagingCursor(childCursor);
        childCursor.moveToFirst();
        return childCursor;
    }
}

item_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
     android:state_pressed="true" 
     android:drawable="@color/green" />
    <item 
     android:state_selected="true" 
     android:drawable="@color/blue" />
    <item 
     android:state_focused="true" 
     android:drawable="@color/violet" />
    <item 
     android:state_activated="true" 
     android:drawable="@color/blue" />
</selector>

Answer 1:

请在ExpandableListView如下:

第1步:设置选择模式单(可以用XML来实现由于Android:choiceMode =“singleChoice”)

步骤2.使用一个选择XML作为背景( 机器人:listSelector = “@绘制/ selector_list_item”)

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
   android:exitFadeDuration="@android:integer/config_mediumAnimTime">

   <item android:drawable="@android:color/holo_blue_bright" android:state_pressed="true"/>
   <item android:drawable="@android:color/holo_blue_light" android:state_selected="true"/>
   <item android:drawable="@android:color/holo_blue_dark" android:state_activated="true"/>

</selector>

步骤3.调用expandableListView.setItemChecked(指数,真正的)在onChildClick()回调。

指数计算的子项的0基于指标如下

第1组 [指数= 0]

  • 子项1
  • 子项2
  • 子项3 [指数= 3]

第2组 [指数= 4]

  • 子项1
  • 子项2
  • 子项3 [指数= 7]

第3组 [指数= 8]

  • 子项1
  • 子项2
  • 子项3 [指数= 11]

如果我们有表头为好,他们也将占到指数值。

这是一个工作示例:

@Override
public boolean onChildClick(ExpandableListView parent, View v,
        int groupPosition, int childPosition, long id) {
    ...

    int index = parent.getFlatListPosition(ExpandableListView.getPackedPositionForChild(groupPosition, childPosition));
    parent.setItemChecked(index, true);


    return true;
}


Answer 2:

花3-4个小时后,它是由它的这么简单无需创建额外的XML文件只是检查组项目展开,如果是,那么选择颜色和else语句使它们,因为它们....

@Override
//in this method you must set the text to see the parent/group on the list
public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {

    if (view == null) {
        view = inflater.inflate(R.layout.list_item_parent, viewGroup,false);
    }

    if(b){
        view.setBackgroundResource(R.color.waterblue);
    }else{
        view.setBackgroundColor(color.transparent);
    }


    //return the entire view
    return view;
}


Answer 3:

我终于想通了如何使这项工作(对我来说)。 这似乎有点劈的,但它是我已经成功地得到这个工作的唯一的东西。

基本上,我创建了一个二维数组来保存孩子的选中状态,在适配器构造函数初始化它,然后我引用我getChildView方法(如果当前选中的孩子滚出视图)和我onChildClick方法(来改变当前选择并关闭旧的)。

private selectedStatus[][];  // array to hold selected state
private View oldView;        // view to hold so we can set background back to normal after selection of another view

构造函数 初始化数组

    public MyExpandableListAdapter(Cursor cursor, Context context,
            int groupLayout, int childLayout, String[] groupFrom,
            int[] groupTo, String[] childrenFrom, int[] childrenTo) {
        super(context, cursor, groupLayout, groupFrom, groupTo,
                childLayout, childrenFrom, childrenTo);
        selectedStatus = new boolean[cursor.getCount()][];
        for (int i = 0; i < cursor.getCount(); i++) {
            cursor.moveToPosition(i);
            Cursor childCheckCursor = mDbHelper.fetchChildren(mGroup,
                    cursor.getString(cursor
                            .getColumnIndex(AttendanceDB.EVENT_ROWID)));
            getActivity().startManagingCursor(childCheckCursor);
            selectedStatus[i] = new boolean[childCheckCursor.getCount()];
            for (int j = 0; j < childCheckCursor.getCount(); j++) {
                selectedStatus[i][j] = false;
            }
        }

    }

getChildView 需要当孩子滚出视图

    @Override 
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
        final View v = super.getChildView(groupPosition, childPosition, isLastChild, convertView, parent); 
        if(selectedStatus[groupPosition][childPosition] == true){
            v.setBackgroundResource(R.color.blue);                          
        } else {
            v.setBackgroundResource(R.color.black);
        }
        return v; 
    } 

onChildClick 更改所选项目

    lv.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {
            mRowId = id;
            EventDisplayFragment eventdisplay = new EventDisplayFragment();
            getFragmentManager().beginTransaction()
                    .replace(R.id.rightpane, eventdisplay).commit();
            if(oldView != null){
                oldView.setBackgroundResource(R.color.black);   // change the background of the old selected item back to default black                 }
            oldView = v;                                        // set oldView to current view so we have a reference to change back on  next selection
            for (int i = 0; i < selectedStatus.length; i++) {
                for (int j = 0; j < checkedStatus[i].length; j++) {
                    if(i == groupPosition && j == childPosition){  // set the current view to true and all others to false
                        selectedStatus[i][j] = true;
                    } else {
                        selectedStatus[i][j] = false;
                    }
                }
            }
            v.setBackgroundResource(R.color.blue);
            return true;
        }
    });


Answer 4:

我在我加入这个固定同样的问题

v.setSelected(true);

这里是我的代码示例:

expandableListDetailsLevel.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);
        expandableListDetailsLevel
                .setOnGroupExpandListener(new OnGroupExpandListener() {

                    public void onGroupExpand(int groupPosition) {

                        if(groupPosition!=1){
                            expandableIsThere = false;
                        }

                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                                expandableListDetailsLevel.collapseGroup(i);
                            }
                        }
                    }
                });

        expandableListDetailsLevel
                .setOnChildClickListener(new OnChildClickListener() {

                    @Override
                    public boolean onChildClick(ExpandableListView parent,
                            View v, int groupPosition, int childPosition,
                            long id) {


                        v.setSelected(true);

                        }

我的项目XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="@drawable/selector" >


<TextView
    android:id="@+id/TVChild"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:textColor="#000"
    android:textSize="12dp"/>

</LinearLayout>

属性android:drawSelectorOnTop="true"在XML文件(而不是项或子组)这样的ExpandableListView元素:

<ExpandableListView
                android:id="@+id/expandableViewDetailsBriefing"
                android:layout_width="fill_parent"
                android:layout_height="match_parent"
                android:background="#fff"
                android:drawSelectorOnTop="true"
                android:dividerHeight="1px"
                android:childDivider="@color/Gris"
                android:indicatorRight="690dp"
                android:textFilterEnabled="true" >
            </ExpandableListView>


Answer 5:

接下来的解决方案帮助您为组和儿童不同的列表选择。

首先,你需要禁用ExpendableListView列表选择:


...
   <ExpandableListView
            ...
            android:listSelector="@android:color/transparent"
            ...
            />
...

之后,你需要复制一个空listSelector。 你可以做你喜欢这个


...
private Drawable empty;
...

// binding view here. Name of ExpandableListView will be elv
empty = elv.getSelector();


现在,我们需要知道,当我们将启用列表选择或禁用。 您应该添加后续更改您的适配器是:


my adapter here {
...
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View view, ViewGroup parent)
    {
       ...
       // after, we've got view of goup
       view.setOnTouchListener(new View.OnTouchListener()
       {
           @Override
           public boolean onTouch(View v, MotionEvent event)
           {
               elv.setSelector(empty);
               return false;
           }
       });
       ...
    }
...
    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, final ViewGroup parent)
    {
       ...
       // after, we've got view of child
       view.setOnTouchListener(new View.OnTouchListener()
       {
           @Override
           public boolean onTouch(View v, MotionEvent event)
           {
               elv.setSelector(R.drawable.my_custom_list_selector);
               return false;
           }
       });
       ...
    }
...
}

就这样。 我希望这个解决方案让您的时间。



Answer 6:

如果你只需要在子项的颜色比改变onchildclick设置背景颜色的视图V方法。

@Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                v.setBackgroundColor(Color.RED);
}

做这样设置isChildSelectable在适配器为true。



Answer 7:

您可以保存当前视图和你的点击侦听器中改变视图背景色:

View currentView;
ExpandableListView elv;

elv.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
    @Override
    public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
        if(currentView != null) {
            currentView.setBackgroundColor(Color.parseColor("#FFFFFF"));
        }
        v.setBackgroundColor(Color.parseColor("#EEEEEE"));
        currentDrawerView = view;

        //do something

        return false;
    }
});
elv.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
    @Override
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
        if(currentView != null) {
            currentView.setBackgroundColor(Color.parseColor("#FFFFFF"));
        }
        v.setBackgroundColor(Color.parseColor("#EEEEEE"));
        currentDrawerView = view;

        //do something

        return false;
    }
});


Answer 8:

这个简单的解决方案帮助我,当我面临着像笔者一样的问题

我有一个布局,我在左边片段可扩展列表和右侧的细节片段。 这一切工作正常。 现在我想以表明正在对剩下什么项目它的右边显示的细节,在这里我有一个问题。

要指出哪些项目在扩展列表中选择去ExpandableListView属性(布局),并选择颜色listSelector。



Answer 9:

expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick( ExpandableListView parent, View v,
                                         int groupPosition, int childPosition,
                                         long id) {



                for (int i = 1; i < expListView.getChildCount(); i++) {
                    View child = (View) expListView.getChildAt(i);
                    child.setBackgroundColor(Color.BLACK);
                }


                if(childPosition==0){
                    initWebView("URL");

                }
                if(childPosition==1) {
                    initWebView("URL");

                }
                if(childPosition==2) {

                    initWebView("URL");

                }
                if(childPosition==3) {
                    initWebView("URL");

                }
                if(childPosition==4) {
                    initWebView("URL");

                }
                if(childPosition==5) {
                    initWebView("URL");
                }

                v.setBackgroundColor(Color.GRAY);


                expListView.setVisibility(View.GONE);
                webView.setVisibility(View.VISIBLE);
                return false;
            }
        });
 }


Answer 10:

expListView.setOnChildClickListener(new OnChildClickListener() {

        @Override
        public boolean onChildClick( ExpandableListView parent, View v,
                                     int groupPosition, int childPosition,
                                     long id) {



            for (int i = 1; i < expListView.getChildCount(); i++) {
                View child = (View) expListView.getChildAt(i);
                child.setBackgroundColor(Color.BLACK);
            }


            if(childPosition==0){
                initWebView("URL");

            }
            if(childPosition==1) {
                initWebView("URL");

            }
            if(childPosition==2) {

                initWebView("URL");

            }
            if(childPosition==3) {
                initWebView("URL");

            }
            if(childPosition==4) {
                initWebView("URL");

            }
            if(childPosition==5) {
                initWebView("URL");
            }

            v.setBackgroundColor(Color.GRAY);


            expListView.setVisibility(View.GONE);
            webView.setVisibility(View.VISIBLE);
            return false;
        }
    });
}


Answer 11:

只需使用以下

    <ExpandableListView
        android:id="@+id/expandable_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:childDivider="#474043"
         android:groupIndicator="@null"
         android:listSelector = "@drawable/item_selector"
        android:background="#555"
        android:drawSelectorOnTop="true"
        android:textFilterEnabled="true"
        />

和你的item_selector.xml如下

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/selection_color_for_ex_list" android:state_pressed="true"/>
    <item android:drawable="@color/selection_color_for_ex_list" android:state_selected="true"/>
    <item android:drawable="@color/selection_color_for_ex_list" android:state_focused="true"/>

</selector>


文章来源: Highlight for selected item in expandable list