Question

我有两个按钮，addBtn和declineBtn。单击其中任何一个时，我想禁用这两个按钮。我一直在

尝试调用虚方法＆＃39; void android.widget.Button.setEnabled（布尔值）＆＃39;在空对象引用上

问题是，如果我点击拒绝按钮，那么onClicklistener v.findViewById找不到添加按钮。任何帮助将不胜感激

public View getView(int position, View convertView, ViewGroup parent) {
        View rowView = convertView;
        if(rowView == null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            rowView = inflater.inflate(R.layout.friend_request_item, parent, false);
        }
        final FriendRequest request = getItem(position);
        TextView userId = (TextView) rowView.findViewById(R.id.textView1);
        userId.setText(request.getRequesterId());

        Button acceptBtn = (Button) rowView.findViewById(R.id.button1);
        acceptBtn.setTag(request.getRequesterId());
        Button declineBtn = (Button) rowView.findViewById(R.id.button2);
        declineBtn.setTag(request.getRequesterId());

        acceptBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Button AddBtn = (Button) v.findViewById(R.id.addbutton1);
                AddBtn.setEnabled(false);
                Button declineBtn = (Button) v.findViewById(R.id.devlinebutton2);
                declineBtn.setEnabled(false);
            }
        });
        declineBtn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Button AddBtn = (Button) v.findViewById(R.id.addbutton1);
                AddBtn.setEnabled(false);
                v.setEnabled(false);
                Button declineBtn = (Button) v.findViewById(R.id.declinebutton2);
                declineBtn.setEnabled(false);
            }
        });
        return rowView;
    }

Answer 1

您不应使用v来致电findViewById()。例如，只需编写(Button) findViewById(R.id.button1)。

Answer 2

我相信按钮位于rowView内，所以我认为您应该使用rowView.findViewById()代替v.findViewById()

当单击其中任何一个时，android禁用两个按钮

2 个答案: