片段中的BackPressed无法正常运行

Question

I have the following code:

v = inflater.inflate(R.layout.fragment_color, container, false);
v.setFocusableInTouchMode(true);
v.requestFocus();
v.setOnKeyListener(new View.OnKeyListener() {

    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (mMenu.isOpened()) {
                mMenu.closeMenu();
            } else {
            }
        }
        return false;
    }
});

When I press the back button, my menu closes like it should, but the app closes as well and it should not.

What am I doing wrong with what I have here? any help would be appreciated.

Answer 1

This is because finishing current activity is back key default behavior. You need to override this behavior by returning true in your onKeyListner. Below code should work for you.

v = inflater.inflate(R.layout.fragment_color, container, false);
v.setFocusableInTouchMode(true);
v.requestFocus();
v.setOnKeyListener(new View.OnKeyListener() {

    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (mMenu.isOpened()) {
                mMenu.closeMenu();
               //It says that you have handled back key
                return true;
            } else {
            }
        }
        return false;
    }
});