Question

我想在用户点击列表项时显示一个弹出窗口。我在片段的Adapter Class中使用initiatePopWindow()。如何解决findViewById和ConfirmActivity？

private void initiatePopupWindow() {
        try {
            //We need to get the instance of the LayoutInflater, use the context of this activity
            LayoutInflater inflater = (LayoutInflater) ConfirmActivity.this
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            //Inflate the view from a predefined XML layout
            View layout = inflater.inflate(R.layout.popup_addword,
                    (ViewGroup) findViewById(R.id.popup_element));
            // create a 300px width and 470px height PopupWindow
            pw = new PopupWindow(layout, 300, 470, true);
            // display the popup in the center
            pw.showAtLocation(layout, Gravity.CENTER, 0, 0);

            TextView WordPop = (TextView) layout.findViewById(R.id.textView2);
            TextView PartsPop = (TextView) layout.findViewById(R.id.textView4);
            TextView DescPop = (TextView) layout.findViewById(R.id.textView6);
            TextView SentPop = (TextView) layout.findViewById(R.id.textView8);
            WordPop.setText(list.getWord());
            PartsPop.setText(list.getParts());
            DescPop.setText(list.getDesc());
            SentPop.setText(list.getDesc());
            ImageButton cancelButton = (ImageButton) layout.findViewById(R.id.imageButton);
            //makeBlack(cancelButton);
            cancelButton.setOnClickListener(cancel_button_click_listener);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Answer 1

您可以在创建适配器实例时将活动上下文从片段传递到适配器。

因为您已经在适配器中获得了上下文。试试这个 -

    LayoutInflater inflater = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//Inflate the view from a predefined XML layout
    View layout = inflater.inflate(R.layout.popup_addword,(ViewGroup)this.activity.findViewById(R.id.popup_element));

Answer 2

片段的getActivity（）方法返回上下文，因此它可用于将上下文传递给适配器，如下所示 -

首先在其构造函数中将上下文作为参数传递给适配器。这可以通过使用片段的getActivity（）方法来完成，因此将片段中的适配器初始化为 -

YourAdapter adapter = new YourAdapter(getActivity(),YourOtherParameters...);

然后在适配器构造函数中应该看起来像

//global
Context context;

public YourAdapter(Context context,YourOtherParameters...) {
    this.context = context;
}

然后使用此上下文来扩充视图。

LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.popup_addword,(ViewGroup)context.findViewById(R.id.popup_element));

无法在Adapter Class中解析ConfirmActivity和findViewById

2 个答案: