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How to use BroadcastReceiver in Kotlin?
This example demonstrates how to use BroadcastReceiver in 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"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="50dp" android:padding="8dp" android:text="Tutorials Point" android:textColor="@color/colorPrimaryDark" android:textSize="48sp" android:textStyle="bold" /> <Switch android:id="@+id/wifiSwitch" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
Example
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.net.wifi.WifiManager
import android.os.Bundle
import android.widget.Switch
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
lateinit var wifiSwitch: Switch
lateinit var wifiManager: WifiManager
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
wifiSwitch = findViewById(R.id.wifiSwitch)
wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
wifiSwitch.setOnCheckedChangeListener { _, isChecked ->
if (isChecked) {
wifiManager.isWifiEnabled = true
wifiSwitch.text = "WiFi is ON"
} else {
wifiManager.isWifiEnabled = false
wifiSwitch.text = "WiFi is OFF"
}
}
}
override fun onStart() {
super.onStart()
val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)
registerReceiver(wifiStateReceiver, intentFilter)
}
override fun onStop() {
super.onStop()
unregisterReceiver(wifiStateReceiver)
}
private val wifiStateReceiver: BroadcastReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
when (intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
WifiManager.WIFI_STATE_UNKNOWN)) {
WifiManager.WIFI_STATE_ENABLED -> {
wifiSwitch.isChecked = true
wifiSwitch.text = "WiFi is ON"
Toast.makeText(this@MainActivity, "Wifi is On", Toast.LENGTH_SHORT).show()
}
WifiManager.WIFI_STATE_DISABLED -> {
wifiSwitch.isChecked = false
wifiSwitch.text = "WiFi is OFF"
Toast.makeText(this@MainActivity, "Wifi is Off", Toast.LENGTH_SHORT).show()
}
}
}
}
}Step 4 − Add the following code to androidManifest.xml
Example
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q20"> <uses-permission android:name="android.permission.CHANGE_WIFI_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: 23-May-2020
4K+ Views
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