Null Pointer Error With Hidesoftinputfromwindow

I get a null pointer exception at this row: public void hideKeyboard(){ InputMethodManager inputManager = (InputMethodManager) this.getSystemService(Contex

Solution 1:

I just need to check if there is a focused view before hiding the keyboard.

For example, if you have an EditText in your activity or fragment, it'll probably be the focused view. When the EditText isn't focused anymore, getCurrentFocus() may return null (unless some other view is focused).

voidhideKeyboard() {
    InputMethodManagerinputManager= (InputMethodManager) getActivity().getSystemService(
            Context.INPUT_METHOD_SERVICE);
    ViewfocusedView= getActivity().getCurrentFocus();
    /*
     * If no view is focused, an NPE will be thrown
     * 
     * Maxim Dmitriev
     */if (focusedView != null) {
        inputManager.hideSoftInputFromWindow(focusedView.getWindowToken(),
                InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

Solution 2:

As CommonsWare mentioned, the getCurrentFocus() is null, since there is no View component inside the current Activity holding the focus.

If you already have a view in your Activity, use it to get the window token. For example, if I have a Button component:

inputManager.hideSoftInputFromWindow(myButton.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);

Or even worse, if I do not have any view already in my Activity, I could do this:

inputManager.hideSoftInputFromWindow(newView(this).getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);

This would solve your problem of NPE, but I hope you find the description useful.

One more thing about keyboards is that when user presses the back button while the keyboard is visible, the keyboard receives and consumes the back key press to hide itself. Or at least most keyboards behave that way.

Solution 3:

Everybody above correctly pointed that the getWindowToken() was returning null.

I was using the default code getCurrentFocus().getWindowToken() to hide keyboard when I encountered the same issue.

I then realized that as there's no View obtaining the focus I got the NullPointerException.

We can change the above to:

anyView.getWindowToken()

where anyView is simply any view in your layout.

Solution 4:

If you want to hide keyboard when touching in the screen, use the below code

@OverridepublicbooleanonTouchEvent(MotionEvent event) {
    InputMethodManagerimm= (InputMethodManager)this.getSystemService(Context.
            INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(this.getWindow().getDecorView().getRootView().getWindowToken(), 0);
    returntrue;
}

If you want to do this in specific view (EditText)

publicvoidhideKeyBoard(EditText edt) {
    InputMethodManagerimm= (InputMethodManager)this.getSystemService(Context.
            INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(edt.getWindowToken(), 0);

}

or you can use any View.

To get the current view

    imm.hideSoftInputFromWindow(this.getWindow().getDecorView().getRootView().getWindowToken(), 0);

Solution 5:

This works for me. Simply add the getWindow().getDecorView().getRootView().getWindowToken() following instead of using getCurrectFocus(). After that You can use this method for any where in your activity.

publicstaticvoidhideSoftKeyboard(Activity activity) {
        InputMethodManagerinputMethodManager=
                (InputMethodManager) activity.getSystemService(
                        Activity.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(
                activity.getWindow().getDecorView().getRootView().getWindowToken(), 0);
    }