0. What is service?
You could see service as a always running program
But by default, a service runs in the same process as the main thread of the application
Therefore, you need to use asynchronous processing in the service to perform resource intensive tasks in the background
1. Basic idea or resources
Official but you can't understand: Google Developer Guide
Unofficial but reachable: tutorials_point
2. Getting started
- Create a kotlin file which names
MyService.kt, and put the following codes in:
class MyService : Service() {
@Nullable
override fun onBind(intent: Intent): IBinder? {
return null
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show()
return START_STICKY
}
override fun onDestroy() {
super.onDestroy()
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show()
}
}
- Change
AndroidManifast.xml, add following after</activity>:
<service android:name=".MyService" />
- Add following to a
.ktfile(means right in main_activity) where you wanna call yourservice
// The View is just a widget in your UI xml
fun startService(view: View) {
startService(Intent(baseContext, MyService::class.java))
}
fun stopService(view: View) {
stopService(Intent(baseContext, MyService::class.java))
}
3. Good to go
Now you are able to run your service using startService(your_layout_id) function
Example: https://github.com/yingshaoxo/Offline_Netease_MusicPlayer
Have fun!
