KeyboardVisibilityListener.java

private IMainActivity mIMainActivity;
static int mAppHeight;
static int currentOrientation = -1;

public void setKeyboardVisibilityListener() {

        final View contentView = getActivity().findViewById(android.R.id.content);

        contentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

            private int mPreviousHeight;

            @Override
            public void onGlobalLayout() {

                int newHeight = contentView.getHeight();

                if (newHeight == mPreviousHeight)

                    return;

                mPreviousHeight = newHeight;

                Log.d(TAG, "onGlobalLayout: new height: " + newHeight);
                if (getActivity().getResources().getConfiguration().orientation != currentOrientation) {

                    currentOrientation = getActivity().getResources().getConfiguration().orientation;

                    mAppHeight =0;
                    Log.d(TAG, "onGlobalLayout: current Orientation: " + currentOrientation);
                    Log.d(TAG, "onGlobalLayout: app height: " + mAppHeight);
                }

                if (newHeight >= mAppHeight) {

                    mAppHeight = newHeight;
                    Log.d(TAG, "onGlobalLayout: app height: " + mAppHeight);
                }
                Log.d(TAG, "onGlobalLayout: -------------------------\n");

                if (newHeight != 0) {
                    MessagesFragment messagesFragment = (MessagesFragment) getActivity()
                            .getSupportFragmentManager().findFragmentByTag(getActivity().getString(R.string.tag_fragment_messages));
                    if(messagesFragment.isVisible()){
                        if (mAppHeight > newHeight) {
                            Log.d(TAG, "onGlobalLayout: hiding bottom nav");
                            // Height decreased: keyboard was shown
                            mIMainActivity.setBottomNavigationVisibility(false);

                        }
                        else {
                            Log.d(TAG, "onGlobalLayout: showing bottom nav");
                            // Height increased: keyboard was hidden
                            mIMainActivity.setBottomNavigationVisibility(true);
                        }
                    }
                }

            }

        });

    }