How To Use Emoji - Android Lollipop
You can use Google Keyboard to choose from a variety of small, colorful images used to express emotion (known as emoji) to add some fun to your messages.
Depending on your device, you may need to touch and hold the Return key and then slide your finger to the happy face to display emoji. On a tablet, just touch the emoji symbol at the lower right.
Youll see a panel like the one pictured above. To move between categories, swipe left or right or touch the symbols in the top row. To type an emoji, touch it.