android - 单击按钮时隐藏键盘( fragment )

Question

我在点击按钮时实现隐藏键盘时出错，有人知道如何解决这个问题吗？实际上getSystemService和getWindowsToken中的代码错误

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_calculator, container, false);

        Button hitung = (Button) rootView.findViewById(R.id.hitung);
        final EditText height = (EditText)rootView.findViewById(R.id.height);
        final EditText weight = (EditText)rootView.findViewById(R.id.weight);

        InputMethodManager imm = InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(EditText.getWindowToken(), 0);

        final TextView result = (TextView)rootView.findViewById(R.id.result);
        final TextView finalresult = (TextView)rootView.findViewById(R.id.finalresult);
        finalresult.setMovementMethod(new ScrollingMovementMethod());

        hitung.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            ..........
}

Answer 1

你正在使用 Fragment 所以写成 getActivity().getSystemService(Context.INPUT_METHOD_SERVICE)

同样的原因:

An Activity extends Context, a Fragment does not. Hence, you first need to get a reference to the Activity in which the Fragment is contained

编辑

对于您在评论中提到的其他错误，您可以使用

getView().getWindowToken()

hide 方法应该在您的按钮的 onClick() 方法中调用，例如

imm.hideSoftInputFromWindow(getView().getWindowToken(), 0);