Question

好的，所以我一直在寻找广泛，我已经能够为每个组添加相同的子项，但我无法让它响应点击。现在它的表现就像一个子标题，我需要它像其他子项一样。

目前，我的列表是从位于另一个文件中的HashMap填充的。因为你不能在没有完全重建它的情况下添加到HashMap的中间，我认为最好的选择是在适配器中访问列表时将子项添加到某处。我只是不确定在哪里或如何。

从getChildView（）可以看出，如果child的位置为0，我会添加重复的子布局（expandedListItemChildHeader）。我还为getChildrenCount（）的大小添加了1个值。

这是我的适配器代码：

<android-sdk>

以下是我的MainActivity中的可扩展列表代码，它位于onCreate（）方法中:(注意：下面示例代码顶部列出的变量在onCreate（）方法之外，我只是将其包括在内参考

public class CustomExpandableListAdapter extends BaseExpandableListAdapter {

private Context context;
private List<String> expandableListTitle;
private HashMap<String, List<String>> expandableListDetail;

public CustomExpandableListAdapter(Context context, List<String> expandableListTitle,
                                   HashMap<String, List<String>> expandableListDetail) {
    this.context = context;
    this.expandableListTitle = expandableListTitle;
    this.expandableListDetail = expandableListDetail;
}

@Override
public Object getChild(int listPosition, int expandedListPosition) {

    return this.expandableListDetail.get(this.expandableListTitle.get(listPosition))
            .get(expandedListPosition);
}


@Override
public long getChildId(int listPosition, int expandedListPosition) {

    return expandedListPosition;
}

@Override
public View getChildView(int listPosition, final int expandedListPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
        LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    //if we're in the first position then add the list_item_header
    if(expandedListPosition == 0)
    {
        convertView = layoutInflater.inflate(R.layout.list_item_header, null);
        TextView expandedListTextView = (TextView) convertView.findViewById(R.id.expandedListItemChildHeader);
        expandedListTextView.setText("All Devices");

    }

    //otherwise add the list_item
    if (expandedListPosition > 0 && expandedListPosition < getChildrenCount(listPosition)) {
        final String expandedListText = (String) getChild(listPosition, expandedListPosition - 1);
        convertView = layoutInflater.inflate(R.layout.list_item, null);
        TextView expandedListTextView = (TextView) convertView.findViewById(R.id.expandedListItem);
        expandedListTextView.setText(expandedListText);
    }

    return convertView;
}

@Override
public int getChildrenCount(int listPosition) {
    //add a value of one to the size of the count of children per group to make
    //room for the child header

    return (this.expandableListDetail.get(this.expandableListTitle.get(listPosition))
            .size() + 1);
}

@Override
public Object getGroup(int listPosition) {
    return this.expandableListTitle.get(listPosition);
}

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

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

@Override
public View getGroupView(int listPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    String listTitle = (String) getGroup(listPosition);
    if (convertView == null) {
        LayoutInflater layoutInflater = (LayoutInflater) this.context.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_group, null);
    }
    TextView listTitleTextView = (TextView) convertView
            .findViewById(R.id.listTitle);
    listTitleTextView.setTypeface(Typeface.create("sans-serif-medium", Typeface.NORMAL));
    listTitleTextView.setText(listTitle);

    //Use this conditional to change direction of group indicator icons
    //the ImageView in the xml layout is invisible by default.
    ImageView groupIndicatorView = (ImageView) convertView.findViewById(R.id.expand_GroupIndicator);
    if (getChildrenCount(listPosition) == 0 ) {
        groupIndicatorView.setVisibility( View.INVISIBLE );
    }
    else {
        groupIndicatorView.setVisibility( View.VISIBLE );
        groupIndicatorView.setImageResource( isExpanded ? R.drawable.ic_expand_less_black_24dp : R.drawable.ic_expand_more_black_24dp );
    }

    return convertView;
}

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

@Override
public boolean isChildSelectable(int listPosition, int expandedListPosition) {
    return true;
}

这是我的布局从list_item_header.xml开始

ExpandableListView expandableListView;
ExpandableListAdapter expandableListAdapter;
List<String> expandableListTitle;
HashMap<String, List<String>> expandableListDetail;


    expandableListView = (ExpandableListView) findViewById(R.id.navDrawer_userListView);
    expandableListDetail = ExpandableListDataPump.getData();
    expandableListTitle = new ArrayList<String>(expandableListDetail.keySet());
    expandableListAdapter = new CustomExpandableListAdapter(this, expandableListTitle, expandableListDetail);
    expandableListView.setAdapter(expandableListAdapter);

    expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        //initialize int var
        int previousGroup = 0;

        @Override
        public void onGroupExpand(int groupPosition) {
            //this conditional enables only one drop down group to open at a time
            if(groupPosition != previousGroup)
                expandableListView.collapseGroup(previousGroup);
            previousGroup = groupPosition;

            Toast.makeText(
                    getApplicationContext(),
                    expandableListTitle.get(groupPosition)
                            + " List Expanded.",
                    Toast.LENGTH_SHORT
            ).show();
        }
    });

    expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

        @Override
        public void onGroupCollapse(int groupPosition) {

            Toast.makeText(getApplicationContext(),
                    expandableListTitle.get(groupPosition) + " List Collapsed.",
                    Toast.LENGTH_SHORT
            ).show();

        }
    });

    expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

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

            v.setSelected(true);

            //Change title on toolbar to match group selection
            getSupportActionBar().setTitle(expandableListTitle.get(groupPosition) + "'s Devices");
            //Change subtitle on toolbar to match item selection
            //must offset child position by 1 to have room for child header
            getSupportActionBar().setSubtitle((String)expandableListAdapter.getChild(groupPosition, childPosition - 1));
            Toast.makeText(
                    getApplicationContext(),
                    expandableListTitle.get(groupPosition)
                            + " -> "
                            + expandableListDetail.get(
                            expandableListTitle.get(groupPosition)).get(
                            childPosition - 1), Toast.LENGTH_SHORT
            ).show();

            return false;
        }
    });

这是我的list_item.xml布局

<?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="wrap_content">

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="7dp">

        <Switch
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@null"
            android:id="@+id/toggle_allDevices"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_gravity="center"
            android:paddingLeft="2dp"
            android:tint="@color/drawerContent"/>

        <TextView
            android:id="@+id/expandedListItemChildHeader"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="@drawable/expandable_text_selector"
            android:paddingLeft="65dp"
            android:paddingTop="16dp"
            android:textSize="16dp"
            android:paddingBottom="16dp" />

    </RelativeLayout>

</LinearLayout>

list_group.xml布局

<?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="wrap_content">

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="7dp">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@null"
            android:id="@+id/deviceTypeIcon"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_gravity="center"
            android:paddingLeft="14dp"
            android:tint="@color/drawerContent"/>

        <TextView
            android:id="@+id/expandedListItem"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="@drawable/expandable_text_selector"
            android:paddingLeft="65dp"
            android:paddingTop="16dp"
            android:textSize="16dp"
            android:paddingBottom="16dp" />

    </RelativeLayout>

</LinearLayout>

最后是我的NavigationView的片段主要活动：

<?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">

    <View
        android:layout_width="match_parent"
        android:layout_height="0.25dp"
        android:layout_alignParentTop="true"
        android:background="@color/drawerContent" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="7dp">

        <TextView
            android:id="@+id/listTitle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:textColor="@color/drawerContent"
            android:background="@color/drawerBg"
            android:paddingTop="16dp"
            android:textSize="16dp"
            android:paddingBottom="16dp" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/expand_GroupIndicator"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_gravity="center"
            android:src="@drawable/ic_expand_more_black_24dp"
            android:paddingRight="15dp"
            android:tint="@color/drawerContent"
            android:visibility="invisible"/>


    </RelativeLayout>

</LinearLayout>

任何帮助将不胜感激！谢谢！

Answer 1

好的，我能解决问题的最后一部分。事实证明，我所要做的就是在我的onChildClick（）方法中设置一个条件来调整我使用以下代码访问的索引：

//this conditional corrects for our new child header that is added in getChildView()
            String newChildSelect = "";

            if (childPosition == 0) {
                newChildSelect = "All Devices";
                getSupportActionBar().setSubtitle(newChildSelect);
            }
            else
            {
                newChildSelect = expandableListDetail.get(expandableListTitle.get(groupPosition)).get(childPosition - 1);
                //Change subtitle on toolbar to match item selection
                getSupportActionBar().setSubtitle((String)expandableListAdapter.getChild(groupPosition, childPosition - 1));
            }

将相同的可点击子项添加到每个组expandablelistview的顶部 - android

1 个答案: