KeyBoard Utility class for detecting keyboard appear disappear events and showing and hiding keyboard.

KeyboardUtil.java

package com.upicit.utility;

import android.app.Activity;
import android.content.Context;
import android.inputmethodservice.KeyboardView;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;

import com.upicit.R;

import java.security.Key;

/**
 * @author kailash09dabhi@gmail.com
 */
public class KeyboardUtil {

    private KeyboardUtil() {
    }

    /**
     * This function is used to hide the virtual keyboard.
     *
     * @param activity
     */
    public static void hideKeyBoard(Activity activity) {
        InputMethodManager inputMethodManager = (InputMethodManager) activity
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(activity.getCurrentFocus()
                .getWindowToken(), 0);
    }

    /**
     * Shows the soft keyboard
     */
    public static void showSoftKeyboard(View view) {
        InputMethodManager inputMethodManager = (InputMethodManager) view
                .getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        view.requestFocus();
        inputMethodManager.showSoftInput(view, 0);
    }

    public interface OnKeyBoardAppearListener {
        public void onKeyBoardAppear();

        public void onKeyBoardDisappear();
    }

    /**
     * This method works only when Activity is instance of ActionbarActivity and it has overlayed actionbar.
     *
     * @param activity
     * @param onKeyBoardAppearListener
     */
    public static void setKeyBoardAppearListener(final ActionBarActivity activity, final OnKeyBoardAppearListener onKeyBoardAppearListener) {
        final View activityRootView = activity.findViewById(android.R.id.content);
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        int heightDiff = activityRootView.getRootView()
                                .getHeight() - activityRootView.getHeight() - activity.getSupportActionBar().getHeight();
                        if (heightDiff > 100) { // if more than 100 pixels, its
                            // probably a keyboard...
                            onKeyBoardAppearListener.onKeyBoardAppear();
                        } else {
                            onKeyBoardAppearListener.onKeyBoardDisappear();
                        }
                    }
                });
    }


}