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How to send an email with a file attachment in Android using Kotlin?
This example demonstrates how to send an email with a file attachment in Android 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.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="4dp" tools:context=".MainActivity"> <EditText android:id="@+id/etTo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5dp" android:hint="Receiver's Email Address!" android:inputType="textEmailAddress" android:singleLine="true" /> <EditText android:id="@+id/etSubject" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:hint="Enter Subject" android:singleLine="true" /> <EditText android:id="@+id/etMessage" android:layout_width="match_parent" android:layout_height="200dp" android:layout_margin="5dp" android:gravity="top|start" android:hint="Compose Email" android:inputType="textMultiLine" /> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:id="@+id/btSend" android:layout_width="80dp" android:layout_height="50dp" android:layout_margin="5dp" android:text="Send" /> <Button android:id="@+id/btAttachment" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentEnd="true" android:text="attachment" /> </RelativeLayout> <TextView android:id="@+id/tvAttachment" android:layout_width="match_parent" android:layout_height="wrap_content" android:drawableStart="@drawable/ic_baseline_attach_file_24" android:visibility="gone" /> </LinearLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.content.Intent
import android.net.Uri
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
lateinit var etEmail: EditText
lateinit var etSubject: EditText
lateinit var etMessage: EditText
lateinit var send: Button
lateinit var attachment: Button
lateinit var tvAttachment: TextView
lateinit var email: String
lateinit var subject: String
lateinit var message: String
lateinit var uri: Uri
private val pickFromGallery:Int = 101
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
etEmail = findViewById(R.id.etTo)
etSubject = findViewById(R.id.etSubject)
etMessage = findViewById(R.id.etMessage)
attachment = findViewById(R.id.btAttachment)
tvAttachment = findViewById(R.id.tvAttachment)
send = findViewById(R.id.btSend)
send.setOnClickListener { sendEmail() }
attachment.setOnClickListener {
openFolder()
}
}
private fun openFolder() {
val intent = Intent()
intent.type = "image/*"
intent.action = Intent.ACTION_GET_CONTENT
intent.putExtra("return-data", true)
startActivityForResult(Intent.createChooser(intent, "Complete action using"), pickFromGallery)
}
private fun sendEmail() {
try {
email = etEmail.text.toString()
subject = etSubject.text.toString()
message = etMessage.text.toString()
val emailIntent = Intent(Intent.ACTION_SEND)
emailIntent.type = "plain/text"
emailIntent.putExtra(Intent.EXTRA_EMAIL, arrayOf(email))
emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject)
emailIntent.putExtra(Intent.EXTRA_STREAM, uri)
emailIntent.putExtra(Intent.EXTRA_TEXT, message)
this.startActivity(Intent.createChooser(emailIntent, "Sending email..."))
}
catch (t: Throwable) {
Toast.makeText(this, "Request failed try again: $t", Toast.LENGTH_LONG).show()
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == pickFromGallery && resultCode == RESULT_OK) {
if (data != null) {
uri = data.data!!
}
tvAttachment.text = uri.lastPathSegment
tvAttachment.visibility = View.VISIBLE
}
}
}Step 4 − 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="com.example.q11"> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <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
Updated on: 18-Aug-2020
1K+ Views
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