【发布时间】：2014-05-09 16:40:29
【问题描述】：
我有一个 ExpandableListView；列表的单个项目（组项目）具有包含 ToggleButton 的 FrameLayout。我这样做是为了增加按钮的触摸区域。我使用按钮来展开它所属的组项的子视图。
一次不能有两个选中按钮，因为当一个被选中时，前一个被选中的按钮将被取消选中。
现在，当我第一次单击某个项目的按钮时，它可以切换；之后，当我单击另一项中的一项时，切换的按钮是位于“单击按钮的位置”+1 位置的按钮。
但是，如果我单击了最后一项的按钮，则将被切换的按钮是位于“当前切换按钮的位置”+1 位置的按钮（这意味着如果我首先切换项目 1，然后单击最后一项的按钮，第 2 项将切换；再次单击最后一项将切换第 3 项，然后是第 4 项、第 5 项，依此类推，直到最后一项将切换）。
这是适配器的代码：
public class CustomList extends BaseExpandableListAdapter {
private final Activity context;
public List<Item> names;//Item is a custom object
public boolean[] buttons;
public int lastChecked;
private final int imageId = R.drawable.item1;
private ExpandableListView list;
public CustomList(Activity context, List<Item> names, ExpandableListView theListView) {
this.context = context;
this.names = names;
this.buttons = new boolean[names.size()];
this.lastChecked = -1;
this.list = theListView;
}
private static class GroupHolder {
TextView txtTitle;
TextView txtData;
ImageView imageView;
ToggleButton toggle;
FrameLayout frame;
}
public View getGroupView(final int position, boolean isExpanded, View convertView, ViewGroup parent) {
GroupHolder holder;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_single, null);
holder = new GroupHolder();
holder.txtTitle = (TextView) convertView.findViewById(R.id.text);
holder.txtData = (TextView) convertView.findViewById(R.id.numberOfFiles);
holder.imageView = (ImageView) convertView.findViewById(R.id.img);
holder.toggle = (ToggleButton) convertView.findViewById(R.id.toggle);
holder.frame = (FrameLayout) convertView.findViewById(R.id.frame);
holder.frame.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_UP) {
if(lastChecked != -1) {//if there's a checked button
buttons[lastChecked] = !buttons[lastChecked];//uncheck it
if(position == lastChecked)//if I clicked on the last checked button
lastChecked = -1;//there's no checked button
else {
buttons[position] = !buttons[position];//check the button
lastChecked = position;//and set it as the last checked one
}
notifyList();
}
return false;
}
});
convertView.setTag(holder);
} else {
holder = (GroupHolder) convertView.getTag();
}
holder.txtTitle.setText(names.get(position).getName());
holder.txtData.setText(names.get(position).getData());
holder.imageView.setImageResource(imageId);
holder.toggle.setChecked(buttons[position]);
if(holder.toggle.isChecked()) {
if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.HONEYCOMB_MR2)
list.expandGroup(position);
else
list.expandGroup(position, true);
} else {
list.collapseGroup(position);
}
return convertView;
}
private static class ChildHolder {
TextView details;
TextView send;
TextView other;
}
public View getChildView(final int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ChildHolder holder;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_child, null);
holder = new ChildHolder();
holder.details = (TextView) convertView.findViewById(R.id.details);
holder.send = (TextView) convertView.findViewById(R.id.send);
holder.other = (TextView) convertView.findViewById(R.id.other);
convertView.setTag(holder);
} else {
holder = (ChildHolder) convertView.getTag();
}
holder.details.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
buttons[lastChecked] = !buttons[lastChecked];//uncheck the only checked button (it always exists at this point)
lastChecked = -1;//there's no checked button
notifyList();
//*call some method in the main activity*
}
});
holder.send.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
buttons[lastChecked] = !buttons[lastChecked];//uncheck the only checked button (it always exists at this point)
lastChecked = -1;//there's no checked button
notifyList();
//*call some method in the main activity*
}
});
holder.other.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
buttons[lastChecked] = !buttons[lastChecked];//uncheck the only checked button (it always exists at this point)
lastChecked = -1;//there's no checked button
notifyList();
//*call some method in the main activity*
}
});
return convertView;
}
public void notifyList() {
this.notifyDataSetChanged();
}
如您所见，在 getGroupView 中，子项的展开或折叠取决于布尔数组中项的值，该值对应于其视图在列表中的位置。我调用 notifyDataSetChanged() 来更新列表。
在主要活动中，我将 onGroupClickListener 设置为 ExpandableListView 并在 onGroupClick 中返回 true，以便在单击组项目时不展开/折叠子视图（因为我为此使用了 ToggleButtons）。
【问题讨论】：
标签： android expandablelistview togglebutton