How to integrate Emojis Keyboard in an Android app?

This example demonstrates how do I integrate emogis keyboard in android app
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:emojicon="http://schemas.android.com/apk/res-auto"
   android:id="@+id/root_view"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:background="#ffffff">
   <ImageView
      android:id="@+id/emoji_btn"
      android:layout_width="40dp"
      android:layout_height="40dp"
      android:layout_alignParentBottom="true"
      android:layout_alignParentLeft="true"
      android:padding="4dp" />
   <ImageView
      android:id="@+id/submit_btn"
      android:layout_width="40dp"
      android:layout_height="40dp"
      android:layout_alignParentBottom="true"
      android:layout_alignParentRight="true"
      android:padding="4dp"
      android:src="@android:drawable/ic_menu_send" />
   <hani.momanii.supernova_emoji_library.Helper.EmojiconEditText
      android:id="@+id/emojicon_edit_text"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_toLeftOf="@id/submit_btn"
      android:layout_toRightOf="@id/emoji_btn"
      android:imeOptions="actionSend"
      android:inputType="text"
      emojicon:emojiconSize="28sp"/>
   <hani.momanii.supernova_emoji_library.Helper.EmojiconEditText
      android:id="@+id/emojicon_edit_text2"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_above="@id/emojicon_edit_text"
      android:imeOptions="actionSend"
      android:inputType="text"
      emojicon:emojiconSize="28sp"/>
   <CheckBox
      android:id="@+id/use_system_default"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/textView"
      android:layout_centerHorizontal="true"
      android:checked="false"
      android:text="Use System Default?"/>
   <hani.momanii.supernova_emoji_library.Helper.EmojiconTextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_centerVertical="true"
      android:layout_marginTop="26dp"
      android:lineSpacingExtra="17sp"
      android:text="Hello Emojis !"
      android:textAppearance="@style/TextAppearance.AppCompat.Large"
      android:textColor="#000000"
      emojicon:emojiconAlignment="bottom"/>
</RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import hani.momanii.supernova_emoji_library.Actions.EmojIconActions;
import hani.momanii.supernova_emoji_library.Helper.EmojiconEditText;
import hani.momanii.supernova_emoji_library.Helper.EmojiconTextView;
public class MainActivity extends AppCompatActivity {
   CheckBox mCheckBox;
   EmojiconEditText emojiconEditText, emojiconEditText2;
   EmojiconTextView textView;
   ImageView emojiButton;
   ImageView submitButton;
   View rootView;
   EmojIconActions emojIcon;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      rootView = findViewById(R.id.root_view);
      emojiButton = (ImageView) findViewById(R.id.emoji_btn);
      submitButton = (ImageView) findViewById(R.id.submit_btn);
      mCheckBox = (CheckBox)findViewById(R.id.use_system_default);
      emojiconEditText = (EmojiconEditText) findViewById(R.id.emojicon_edit_text);
      emojiconEditText2 = (EmojiconEditText) findViewById(R.id.emojicon_edit_text2);
      textView = (EmojiconTextView) findViewById(R.id.textView);
      emojIcon = new EmojIconActions(this, rootView, emojiconEditText, emojiButton);
      emojIcon.ShowEmojIcon();
      emojIcon.setKeyboardListener(new EmojIconActions.KeyboardListener() {
         @Override
         public void onKeyboardOpen() {
            Log.e("Keyboard", "open");
         }  
         @Override
         public void onKeyboardClose() {
            Log.e("Keyboard", "close");
         }
      });
      mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
         @Override
         public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            emojIcon.setUseSystemEmoji(b);
            textView.setUseSystemDefault(b);
         }
      });
      emojIcon.addEmojiconEditTextList(emojiconEditText2);
      submitButton.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            String newText = emojiconEditText.getText().toString();
            textView.setText(newText);
         }
      });
   }
}
Step 4 − In the build.gradle(Project: Sample4) add the following code −
repositories {
maven { url 'https://jitpack.io' }
Step 5 − build.gradle (Module: app)
implementation 'com.github.hani-momanii:SuperNova-Emoji:1.1'
Step 6 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      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>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.