Intents - jorgepascoPE/Kotlin-snippets GitHub Wiki

An intent is an abstract description of an operation to be performed. It can be used to launch an Activity (as described on this page), to send it to any interested BroadcastReceiver components, and to communicate with a background Service.

Documentation

Create Intent and start activity

To create a simple intent to move from one activity to another

On sender

var fooIntent = Intent(context, fooActivity::class.java)
// Put information into the intent required by the receiver activity
fooIntent.putExtra("name1", value1)
fooIntent.putExtra("name2", value2)

startActivity(fooIntent)

On receiver

// Save information received in the intent
var fooVar = intent.getStringExtra("name1")
var fooVar2 = intent.getStringExtra("name2")

Broadcast

On Constants file

const val BROADCAST_SOME_ACTION = "BROADCAST_SOME_ACTION"

On activities

Imports

import android.support.v4.content.LocalBroadcastManager
import com.example.jorgepasco.smackapp.Utilities.BROADCAST_SOME_ACTION

Send

fun clickHandler(view: View){
    val newIntent = Intent(BROADCAST_SOME_ACTION) // Create Intent with a given action
    LocalBroadcastManager.getInstance(context).sendBroadcast(newIntent)
}

Receive

override fun onCreate(savedInstanceState: Bundle?) {
    LocalBroadcastManager.getInstance(context).registerReceiver(customReceiver,
                IntentFilter(BROADCAST_USER_DATA_CHANGE))
}

private val customReceiver = object: BroadcastReceiver() {
  override fun onReceive(context: Context, intent: Intent ? ) {
    // Do something
  }
}