如何在安卓应用中集成表情符号？

xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rootView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#43a047"
    android:padding="8dp"
    tools:context=".MainActivity">
    <LinearLayout
        android:id="@+id/llTextViews"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toTopOf="@id/etEmoji"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent">
    LinearLayout>
    <com.vanniktech.emoji.EmojiEditText
        android:id="@+id/etEmoji"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="Say something to GeeksForGeeks..."
        app:emojiSize="30sp"
        android:textColor="@android:color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/btnEmojis"
        app:layout_constraintStart_toStartOf="parent"/>
    <Button
        android:id="@+id/btnEmojis"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Emojis"
        app:layout_constraintEnd_toStartOf="@id/btnSend"
        app:layout_constraintTop_toTopOf="@id/etEmoji"
        app:layout_constraintBottom_toBottomOf="@id/etEmoji"/>
    <Button
        android:id="@+id/btnSend"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Send"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/etEmoji"
        app:layout_constraintBottom_toBottomOf="@id/etEmoji"/>
androidx.constraintlayout.widget.ConstraintLayout>


xml version="1.0" encoding="utf-8"?>
<com.vanniktech.emoji.EmojiTextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_marginBottom="16dp"
    app:emojiSize="30sp"
    android:textSize="30sp"
    android:textColor="@android:color/white"/>


import android.app.Application;
import com.vanniktech.emoji.EmojiManager;
import com.vanniktech.emoji.google.GoogleEmojiProvider;
public class EmojiApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        EmojiManager.install(new GoogleEmojiProvider());
    }
}


<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.emojigfg">
    <application
        android:name=".EmojiApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>
manifest>


import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import com.vanniktech.emoji.EmojiPopup;
import com.vanniktech.emoji.EmojiTextView;
public class MainActivity extends AppCompatActivity {
    EditText etEmoji;
    LinearLayout llTextViews;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        etEmoji=findViewById(R.id.etEmoji);
        llTextViews=findViewById(R.id.llTextViews);
        final EmojiPopup popup = EmojiPopup.Builder
                .fromRootView(findViewById(R.id.rootView)).build(etEmoji);
        Button btnEmojis=findViewById(R.id.btnEmojis);
        btnEmojis.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                popup.toggle();
            }
        });
        Button btnSend=findViewById(R.id.btnSend);
        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                llTextViews.addView(getEmojiTextView());
                etEmoji.getText().clear();
            }
        });
    }
    private EmojiTextView getEmojiTextView() {
        EmojiTextView tvEmoji = (EmojiTextView) LayoutInflater
                .from(getApplicationContext())
                .inflate(R.layout.text_view_emoji, llTextViews,false);
        tvEmoji.setText(etEmoji.getText().toString());
        return tvEmoji;
    }
}