在片段中使用吐司

Question

当用户点击片段内的按钮时,我正在尝试显示Toast消息.问题是我无法访问活动以显示其上的Toast.

这是以下来源Fragment:

    public class FrgTimes extends Fragment
    {
        ScrollView sv;
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) 
        {
            if (container == null) { return null; }

            sv = (ScrollView)inflater.inflate(R.layout.frg_times, container, false);

            btnTime1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

            //******  HERE's the PROBLEM  ********
            Toast.makeText(<The Activity>, "Please long press the key", Toast.LENGTH_LONG );

            }});

            return sv;
        }

这是我一直在尝试的.

Toast.makeText( getActivity()  , ...
Toast.makeText( getView().getContext()  , ...
Toast.makeText( getActivity().getApplicationContext()  , ...
Toast.makeText( sv.getContext()  , ...
Toast.makeText( sv.getRootView().getContext()  , ...

在Debug中,我可以看到所有这些代码都没有任何异常但没有TOAST显示.

Answer 1

你没有打电话show()给Toast你正在创造的makeText().

Answer 2

如alfo888_ibg所述:

@Override
public void onClick(View arg0) {
   Toast.makeText(activity,"Text!",Toast.LENGTH_SHORT).show();
}

做就是了:

    Toast.makeText(getActivity(),"Text!",Toast.LENGTH_SHORT).show();

这对我有用.

Answer 3

为了帮助另一个遇到同样问题的人,Fragment中使用Toast的完整答案是:

Activity activity = getActivity();

@Override
public void onClick(View arg0) {

    Toast.makeText(activity,"Text!",Toast.LENGTH_SHORT).show();
}

Answer 4

在片段中进行吐司时,请执行以下操作:

Toast.makeText(getActivity(),"Message", Toast.LENGTH_SHORT).show();

当类扩展片段时,必须使用getActivity(),因为fragment是activity 的子类.

Cheerse

Answer 5

您可以使用getActivity()获取当前活动

Toast.makeText(getActivity(),"Toast your message" ,Toast.LENGTH_SHORT).show();

Answer 6

在片段中制作吐司

 Toast.makeText(getActivity(), "Your Text Here!", Toast.LENGTH_SHORT).show();

要么

    Activity activityObj = this.getActivity();

    Toast.makeText(activityObj, "Your Text Here!", Toast.LENGTH_SHORT).show();

要么

Toast.makeText(this, "Your Text Here!", Toast.LENGTH_SHORT).show();