扩展列表视图不起作用

时间:2017-09-25 17:57:10

标签: android xml android-layout expandablelistview android-checkbox

我正在尝试使用复选框创建Expanded List View,这是设置的内容。

但由于某些原因,它对我不利。

我尝试过很多不同的教程,花了很多时间。但他们似乎都以同样的方式结束。它显示在我的活动上,但它不会扩展或崩溃。

这是我的settings.XML代码:

<ExpandableListView
 android:id="@+id/lvExp"
 android:layout_height="match_parent"
 android:layout_width="match_parent"/>

这是我的父XML代码:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp"
android:background="#000000">


<TextView
    android:id="@+id/lblListHeader"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="?
    android:attr/expandableListPreferredItemPaddingLeft"
    android:textSize="17dp"
    android:textColor="#f9f93d" />

</LinearLayout>

这是我的子XML代码:

<?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="55dip"
 android:orientation="vertical" >

<TextView
    android:id="@+id/lblListItem"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="17dip"
    android:paddingTop="5dp"
    android:paddingBottom="5dp"
    android:paddingLeft="?
    android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>

这是我的可扩展列表适配器

package com.example.edonfreiner.siddur;

import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;

public ExpandableListAdapter(Context context, List<String> 
listDataHeader,
                             HashMap<String, List<String>> 
listChildData) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return 
this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, final int childPosition,
                         boolean isLastChild, View convertView, 
ViewGroup parent) {

    final String childText = (String) getChild(groupPosition, 
childPosition);

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_item, null);
    }

    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.lblListItem);

    txtListChild.setText(childText);
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return 
this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}

@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);

    return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) 
{
    return true;
}
}

到目前为止,我甚至可以让它工作,更不用说在其中放置复选框了,我希望这更容易。

enter image description here

2 个答案:

答案 0 :(得分:0)

我已经意识到当ExpandableListView的子节点是可聚焦的(比如Button,Checkbox)时,你需要设置(在你的子元素上):

students  |    classes
-----------+----------------
 Paige     | Calculus
 Pajak     | Calculus
 Pajak     | Yoga
 Pamela    | Calculus
 Pamela    | Cooking Pasta
 Pamela    | Football
 Pamela    | Singing
 Pamela    | Yoga
 Parker    | English
 Parker    | Fruit
 Parker    | Social Studies

这是因为这些子元素会从您的触摸中窃取焦点,这意味着扩展列表视图。

这是我Android ExpandableListView not expanding问题的答案,这似乎对少数人有所帮助。

编辑可聚焦属性表示窗口小部件可以获得与点击不同的焦点(按钮,复选框等等)

答案 1 :(得分:0)

我认为这可能是两个问题之一:要么getChildrenCount方法返回0,要么某个视图正在获得焦点。尝试在父XML的容器布局中使用此代码:

$orders = Order::whereHas('lastStatus', function ($query) use ($statuses) {
    $query->whereIn('OrderStautsNames.id', $statuses);
})->get();