This example demonstrates how to send emails using gmail from my Android application using Kotlin.
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.
Example
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="https://schemas.android.com/apk/res/android" xmlns:tools="https://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="4dp" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Recipient email!" /> <EditText android:id="@+id/editTextMail" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Subject" /> <EditText android:id="@+id/editTextSubject" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Message" /> <EditText android:id="@+id/editTextMessage" android:layout_width="match_parent" android:layout_height="wrap_content" android:lines="4" /> <Button android:id="@+id/buttonSend" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Send" /> </LinearLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.content.Intent import android.os.Bundle import android.widget.Button import android.widget.EditText import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { lateinit var editTextMail: EditText lateinit var editTextSubject: EditText lateinit var editTextMessage: EditText lateinit var buttonSend: Button lateinit var email: String lateinit var subject: String lateinit var message: String override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" editTextMail = findViewById(R.id.editTextMail) editTextSubject = findViewById(R.id.editTextSubject) editTextMessage = findViewById(R.id.editTextMessage) buttonSend = findViewById(R.id.buttonSend) buttonSend.setOnClickListener { getData() " startActivity(Intent.createChooser(intent, "Select email")) } } private fun getData() { email = editTextMail.text.toString() subject = editTextSubject.text.toString() message = editTextMessage.text.toString() } }
Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android" package="com.example.q11"> <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 the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen