当在扩展列表视图中单击“子项”中的按钮时，Android更改父项的背景

Question

我有一个ExpandableListView，它显示消息，在子视图中，您可以看到文本和一个按钮来接受已阅读的消息。 当单击按钮时，我想更改父视图的背景色。

我使用了适配器，但是我不知道如何在接受按钮的onclick方法中更改父视图。 到目前为止，这是我的适配器：

     public class WarningAdapter extends BaseExpandableListAdapter {


    public ArrayList<Warning> mWarnings;
    public LayoutInflater minflater;
    public Fragment fragment;
    public Context context;


    public WarningAdapter(ArrayList<Warning> warnings){
        mWarnings = warnings;
    }

    public void setInflater(LayoutInflater mInflater, Fragment frag) {
        this.minflater = mInflater;
        fragment = frag;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return mWarnings.get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        TextView text = null;
        Button accept = null;
        Button delete = null;

        // TODO Auto-generated method stub
        if (convertView == null) {
            convertView = minflater.inflate(R.layout.warning_details, null);
        }
        text = (TextView) convertView.findViewById(R.id.tv_warning_text);
        accept = (Button) convertView.findViewById(R.id.btn_warning_accept);
        delete = (Button) convertView.findViewById(R.id.btn_warning_delete);


        accept.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                mWarnings.get(groupPosition).setIsRead(true);
            }
        });

        text.setText(mWarnings.get(groupPosition).getMessage());

        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return 1;
    }

    @Override
    public Object getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return mWarnings.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        // TODO Auto-generated method stub
        return mWarnings.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        TextView subject = null;
        TextView date = null;
        ImageView category = null;
        LinearLayout background = null;


        if (convertView == null) {
            convertView = minflater.inflate(R.layout.warning_head, null);
        }
        subject = (TextView) convertView.findViewById(R.id.tv_warning_subject);
        date = (TextView) convertView.findViewById(R.id.tv_warning_date);
        category = (ImageView) convertView.findViewById(R.id.img_warning_category);
        background = (LinearLayout) convertView.findViewById(R.id.Layout_warning_head);

        subject.setText(mWarnings.get(groupPosition).getCategory()+"sub");
        date.setText(mWarnings.get(groupPosition).getEntryDate()+"date");
        category.setImageResource(R.drawable.ic_launcher);

if(mWarnings.get(groupPosition).getIsRead()){
            background.setBackgroundColor(Color.TRANSPARENT);           
        }

        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return false;
    }

    }  

编辑：我找到了某种方法来获取它，但它不是我想要的。 仅当我第二次单击父级以使其塌陷时，背景才会改变。 另一种尝试是在onClick方法内部调用getGroupView，但我无法使其正常工作。

Answer 1

您可以尝试：

parent.setBackgroundColor(color);