當在擴展列表視圖中單擊“子項”中的按鈕時，Android更改父項的背景

Question

我有一個ExpandableListView，它顯示消息，在子視圖中，您可以看到文本和一個按鈕來接受已閱讀的消息。 當單擊按鈕時，我想更改父視圖的背景色。

我使用了適配器，但是我不知道如何在接受按鈕的onclick方法中更改父視圖。 到目前為止，這是我的適配器：

     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;
    }

    }  

編輯：我找到了某種方法來獲取它，但它不是我想要的。 僅當我第二次單擊父級以使其塌陷時，背景才會改變。 另一種嘗試是在onClick方法內部調用getGroupView，但我無法使其正常工作。

Answer 1

您可以嘗試：

parent.setBackgroundColor(color);