Android Softkeyboard Listener

public class KeyboardWatcher {
    private final WeakReference<Activity> activityRef;
    private WeakReference<View> rootViewRef;
    private WeakReference<OnKeyboardToggleListener> onKeyboardToggleListenerRef;
    private ViewTreeObserver.OnGlobalLayoutListener viewTreeObserverListener;

    /**     * Instantiates a new Keyboard watcher.     *     * @param activity the activity     */    public KeyboardWatcher(Activity activity) {
        activityRef = new WeakReference<>(activity);
        initialize();
    }

    /**     * Sets listener.     *     * @param onKeyboardToggleListener the on keyboard toggle listener     */    public void setListener(OnKeyboardToggleListener onKeyboardToggleListener) {
        onKeyboardToggleListenerRef = new WeakReference<>(onKeyboardToggleListener);
    }

    /**     * Destroy.     */    public void destroy() {
        if (rootViewRef.get() != null)
            if (Build.VERSION.SDK_INT >= 16) {
                rootViewRef.get().getViewTreeObserver().removeOnGlobalLayoutListener(viewTreeObserverListener);
            } else {
                rootViewRef.get().getViewTreeObserver().removeGlobalOnLayoutListener(viewTreeObserverListener);
            }
    }

    private void initialize() {
        if (hasAdjustResizeInputMode()) {
            viewTreeObserverListener = new GlobalLayoutListener();
            rootViewRef = new WeakReference<>(activityRef.get().findViewById(Window.ID_ANDROID_CONTENT));
            rootViewRef.get().getViewTreeObserver().addOnGlobalLayoutListener(viewTreeObserverListener);
        } else {
            throw new IllegalArgumentException(String.format("Activity %s should have windowSoftInputMode=\"adjustResize\"" +
                    "to make KeyboardWatcher working. You can set it in AndroidManifest.xml", activityRef.get().getClass().getSimpleName()));
        }
    }

    private boolean hasAdjustResizeInputMode() {
        return (activityRef.get().getWindow().getAttributes().softInputMode & WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE) != 0;
    }

    /**     * The interface On keyboard toggle listener.     */    public interface OnKeyboardToggleListener {
        /**         * On keyboard shown.         */        void onKeyboardShown();

        /**         * On keyboard closed.         */        void onKeyboardClosed();
    }

    private class GlobalLayoutListener implements ViewTreeObserver.OnGlobalLayoutListener {
        /**         * The Initial value.         */        int initialValue;
        /**         * The Has sent initial action.         */        boolean hasSentInitialAction;
        /**         * The Is keyboard shown.         */        boolean isKeyboardShown;

        @Override        public void onGlobalLayout() {
            if (initialValue == 0) {
                initialValue = rootViewRef.get().getHeight();
            } else {
                if (initialValue > rootViewRef.get().getHeight()) {
                    if (onKeyboardToggleListenerRef.get() != null) {
                        if (!hasSentInitialAction || !isKeyboardShown) {
                            isKeyboardShown = true;
                            onKeyboardToggleListenerRef.get().onKeyboardShown();
                        }
                    }
                } else {
                    if (!hasSentInitialAction || isKeyboardShown) {
                        isKeyboardShown = false;
                        rootViewRef.get().post(new Runnable() {
                            @Override                            public void run() {
                                if (onKeyboardToggleListenerRef.get() != null) {
                                    onKeyboardToggleListenerRef.get().onKeyboardClosed();
                                }
                            }
                        });
                    }
                }
                hasSentInitialAction = true;
            }
        }
    }

}

Implement it and register for it in oncreate

keyboardWatcher = new KeyboardWatcher(this);
keyboardWatcher.setListener(this);

and then override following mehods

@Overridepublic void onKeyboardShown() {
 
}

@Overridepublic void onKeyboardClosed() {

 

}