Answer by Oreofe Solarin for TextField Widget with emoji flutter

To open the emoji container emoji_picker

Create A method emojiContainer

 emojiContainer() {  return EmojiPicker(      bgColor: Colors.red,      indicatorColor: Colors.blue,      rows: 3,      columns: 7,      onEmojiSelected: (emoji, category) {        setState(() {          isWriting = true;        });        textFieldController.text = textFieldController.text + emoji.emoji;      },      recommendKeywords: ["face", "happy", "party", "sad"],      numRecommended: 50,    );  }

And use an onPressed

onPressed: () {                    if (!showEmojiPicker) {                      // keyboard is visible                      hideKeyboard();                      showEmojiContainer();                    } else {                      //keyboard is hidden                      showKeyboard();                      hideEmojiContainer();                    }                  },