activity_main.xmlMainActivity.java
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingEnd="16dp"
    android:paddingStart="16dp"
    android:paddingTop="200dp"
    tools:context="com.codinginflow.imeoptionsexample.MainActivity">

    <EditText
        android:id="@+id/edit_text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Username"
        android:inputType="text" />

    <EditText
        android:id="@+id/edit_text2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:imeOptions="actionSend"
        android:inputType="textPassword" />

</LinearLayout>
package com.codinginflow.imeoptionsexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        EditText editText1 = findViewById(R.id.edit_text1);
        EditText editText2 = findViewById(R.id.edit_text2);
        editText1.setOnEditorActionListener(editorListener);
        editText2.setOnEditorActionListener(editorListener);
    }

    private TextView.OnEditorActionListener editorListener = new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            switch (actionId) {
                case EditorInfo.IME_ACTION_NEXT:
                    Toast.makeText(MainActivity.this, "Next", Toast.LENGTH_SHORT).show();
                    break;
                case EditorInfo.IME_ACTION_SEND:
                    Toast.makeText(MainActivity.this, "Send", Toast.LENGTH_SHORT).show();
                    break;
            }
            return false;
        }
    };
}