Explicit Intent in Android you can use for launch a specific app component, like a particular Service, Activity or Broadcast. For example, if you want to go to one activity to another one then you can use Explicit Intent and send data putExtra("value", "eyehunt Tutorial") to second activity. In this example, you will learn how to pass data one activity to another activity using kotlin language.
In Android, there are 2 types of Intent.
- Implicit Intent
- Explicit Intent
Some use case of Explicit Intent is :
- Start the service
- Launch a new activity
- Broadcast a message
Android Intent and Types of the Intent tutorial you can read about all basic of about
Let’s Build an App for Explicit intent in kotlin :
In this tutorial, you’ll add Button and EditText widget code to that MainActivity starts a new activity to display the message when the user taps sendMessage.
Step 1. Create a new project “Build Your First Android App in Kotlin“
Step 2. Create a new Activity ” SecondActivity.kt ” class
Choose an option auto to create resource file or create my own. Add the following code in in “activity_second.xml” res layout file.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/ed_name"
android:layout_width="359dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:ems="10"
android:inputType="textPersonName"
android:hint="Enter name "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btn_send_data"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="Send Data"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ed_name"
android:onClick="sendMessage"
tools:ignore="OnClick" />
</android.support.constraint.ConstraintLayout>Now add code in SecondActivity.class and set resource layout file.
package `in`.eyehunt.explicitintentkotlin
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_second.*
class SecondActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_second)
val intent = intent
val strName= intent.getStringExtra("name")
tv_name.text = strName
}
}
Step 3. Add Buttons and EditText widget in an activity_main.xml resource file
EditText for taking user input as a string and button will perform an action to pass data and start a new activity.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/ed_name"
android:layout_width="359dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:ems="10"
android:inputType="textPersonName"
android:hint="Enter name "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btn_send_data"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:text="Send Data"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ed_name"
android:onClick="sendMessage"
tools:ignore="OnClick" />
</android.support.constraint.ConstraintLayout>Step 3. Add the following code in MainActivity.class
In this code using the button, it’s very easy just pass the intent with putExtra() to the target component.
package `in`.eyehunt.explicitintentkotlin
import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun sendMessage(view: View){
val intent = Intent(this@MainActivity,SecondActivity::class.java).apply {
putExtra("name",ed_name.text.toString())
}
startActivity(intent)
}
}
Step 4. Run the application, in emulator or On you android device
Output screenshot Android Explicit Intent example :
Video Output
Download source code Android Explicit Intent example in kotlin
https://github.com/EyeHunts/ExplicitIntentKotlin
Note : This example (Project) is developed in Android Studio 3.1.3 . Tested on Android 9 ( Android-P), compile SDK version API 26: Android 8.0 (Oreo)
MinSdkVersion=”15″
TargetSdkVersion=”27″
Coding in Kotlin
Bonus :