Intents

Définition

Objet qui contient les infos pour trouver et démarrer une Activity (Service, Broadcast plus rarement)

La requête peut venir d'une autre app, d'une autre Activity de la même app ou du système.

Explicite

val explicitIntent =
  Intent(context, MyActivity::class.java)

startActivity(intent)

Implicite

val urlIntent = Intent("http://www.google.com")
val callButtonIntent = Intent(ACTION_CALL_BUTTON)
val phoneIntent = Intent(ACTION_DIAL, "tel:8005551234")
val searchIntent = Intent(Intent.ACTION_WEB_SEARCH)
searchIntent.putExtra(SearchManager.QUERY, "cats")

val createPdfIntent = Intent(ACTION_CREATE_DOCUMENT)
createPdfIntent.type = "application/pdf" // MIME type
createPdfIntent.addCategory(CATEGORY_OPENABLE)

Send / Receive data

// Preparing intent in SendActivity
val intent = Intent(this, SecondActivity::class.java)
intent.data = Uri.parse("https://www.google.com") // Web URL
intent.data = Uri.fromFile(File("/file_path/file.jpg")) // File URI
intent.putExtra("level_key", 42)
intent.putExtra("food_key", arrayOf("Rice", "Beans", "Fruit"))
startActivity(intent)

// Receiving data in ReceiveActivity
val uri = intent.data
val level = intent.getIntExtra("level_key", 0) // default to 0
val food = intent.getStringArrayExtra("food_key")

Resolving intents

// Check if that intent can be handled !
if (intent.resolveActivity(packageManager) != null) {
   startActivity(intent)
}

Using Chooser Intent / Sharesheet

// using Chooser Intent / Sharesheet
val intent = Intent(Intent.ACTION_SEND)
val chooserIntent = Intent.createChooser(intent, "Title")
startActivity(chooserIntent)

Intent Filters

<activity android:name="ShareActivity">
    <intent-filter>
        <action android:name="android.intent.action.SEND" />
        <action android:name="android.intent.action.SEND_MULTIPLE"/>
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="text/plain" />
        <data android:mimeType="image/*" />
        <data android:mimeType="video/*" />
    </intent-filter>
</activity>
<activity android:name="BrowserActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="https" />
        <data android:host="developer.android.com" />
    </intent-filter>
    <intent-filter>
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </intent-filter>
</activity>

Requesting

class FirstActivity : Activity() { // requesting Activity
    val startForResult = registerForActivityResult(StartActivityForResult()) { result ->
    if (result.resultCode == Activity.RESULT_OK) // use result.data
}
    fun onUserStartedSomething() {
        startForResult.launch(Intent(this, SecondActivity::class.java))
    }
}

Toute Activity a une propriété intent qui a permis de la créer:

class SecondActivity : Activity() {
    fun onUserFinishedSomething() { // ...
        intent.putExtra("reply_key", "reply data") // add result data to intent
        setResult(RESULT_OK, intent) // specify all went well and return the data
        finish() // close this activity
    }
}

Creating a custom contract

Default ActivityResultContracts

Exemple:

val getContent = registerForActivityResult(GetContent()) { uri ->  ... }

getContent.launch("image/*")

Documentation

iOS

iOS: Segues

self.performSegue(withIdentifier: "SECOND_SCREEN_SEGUE", for sender: self)

Documentation

iOS: Demander un résultat

On fait des delegate à la main:

protocol ImageDelegate{
  func onImageReceived(_ picker: ImagePickerController, didReceiveValue value: UIImage)
  func onCancel(_ picker: ImagePickerController)
}

class TakePictureController : UIViewController, ImageDelegate{ ... }

iOS: Share Extensions

Plus compliqué: Il faut crér un module à part avec son propre ViewController

Les capabilities sont dans un fichierde configuration (plist):