Memeify

A RayWenderlich Android Project for practicing Intent with Kotlin

Implicit Intents

• informs Android taht it needs an app to handle the intent's actoin when it starts. - The Android system then compares the given intent against all apps installed on the device to see which ones can handle that action,
• process the intent (if more than one can handle the intent, the user is prompt to choose one)

Implicit Intent: MediaStore.ACTION_IMAGE_CAPTURE

It's used to retrieve image data captured from camera.

Explicit Intents

Compared to implicit intents, explicit intents are a lot more conservative.

• describes a specific component that will be created and used
• typically used for transferring 'explicit' data to another activity

Handling Intents

• For Uri, uses intent.getParcelable<Uri>(TAG)
• For Int, uses intent.getIntExtra(TAG, defaultValue)

Broadcast Intents

val mediaScanIntent = Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE)
mediaScanIntent.data = Uri.fromFile(imageFile)
sendBroadcast(mediaScanIntent)

• uses ACTION_MEDIA_SCANNER_SCAN_FILE action to attach data (in a form of a Uri) to save image files to your local Android file system

Intent Filtering

• Add intent-filter tag into your AndroidManifest.xml for Android to be able to do different ACTION outside of App.
• For instance, this app uses ACTION_SEND action to get images directly from Photo/Gallery app