onCreateView（）-無法靜態引用非靜態方法

Question

在字段中輸入一些文本后，我試圖關閉軟鍵盤。 這是片段上的onCreateView（）上的代碼。 但是，出現以下錯誤：

Cannot make a static reference to the non-static method getWindow() from the type Activity
Cannot make a static reference to the non-static method getSystemService(String) from the type Activity

有任何想法嗎？

public class SignInActivity extends ActionBarActivity {

    [...]


    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

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

            getWindow().setSoftInputMode(
              WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

            EditText phone =                   
              (EditText)getView().findViewById(R.id.input_field);
            phone.setOnEditorActionListener(new OnEditorActionListener() {
                @Override
                public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                    if (event != null&& (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)) {
                        InputMethodManager in = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);

                        in.hideSoftInputFromWindow(((TextView) v.getWindowToken()).getApplicationWindowToken(),
                                InputMethodManager.HIDE_NOT_ALWAYS);
                       return true;

                    }
                    return false;
                }
            });

            return rootView;
        }
    }
}

Answer 1

它必須是

getActivity().getWindow()

和

getActivity().getSystemService()

您的代碼中還有另一個錯誤。 代替

EditText phone =                   
          (EditText)getView().findViewById(R.id.input_field);

它必須是

EditText phone =                   
          (EditText)rootView.findViewById(R.id.input_field);

Answer 2

這兩個方法需要片段不保存的Context 。

更換

getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

與

getActivity().getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

和

InputMethodManager in = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);

與

InputMethodManager in = (InputMethodManager)     getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);