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App start

An action block that starts an app activity.

The fiber will proceed immediately without pause. If you want the fiber to pause until the activity has finished, use the App decision block instead.

An app activity is referred, either explicitly by its package and activity class, e.g. by using the Pick activity button, or implicitly by an action and data URI. Explicit start is seldom needed and should be avoided as it will stop working if the activity class is renamed. To implicitly start the “main” activity like the launcher does, specify only the package.

What data, actions and extras an activity support varies. Search for public documentation, or look at the app manifest for clues. Information about common Intents. The Pick shortcut button may be able to extract some of this information from a shortcut as created by an app, see also Shortcut start block.

When including a file URI either as data URI or "android.intent.extra.STREAM" extra, ensure to enable the appropriate Grant flags otherwise it may be inaccessible to the app.

Note! If this block cause a ActivityNotFoundException, SecurityException or otherwise fail it’s likely because the activity isn’t exported, it’s been temporarily or permanently disabled, or it’s secured by a permission to prevent third-party apps from launching it.

Actions

The list below describe some universal or more notable actions:

Extras

The table below lists some of the commonly used keys for the extras dictionary:

KeyConversion typeDescription
"android.intent.extra.HTML_TEXT"StringA HTML alternative to "android.intent.extra.TEXT".
"android.intent.extra.REFERRER"UriHTTP or package referrer.
"android.intent.extra.STREAM"UriA data stream, e.g. a file URI.
"android.intent.extra.SUBJECT"StringSubject of a message.
"android.intent.extra.TEXT"CharSequenceA generic text.
"android.intent.extra.TITLE"CharSequenceA generic title.
"query"StringA search query.

Launch options

KeyConversion typeDescription
"android:activity.animType"IntValue as 7 will launch activity “behind”, without presenting it to user so it’s only accessible through “recents” screen, requires New document flag (Android 4.4+)
"android:activity.launchBounds"RectThe [left,top,right,bottom] bounds (window size) that the activity should be launched in (Android 7+)
"android.activity.launchDisplayId"IntDisplay id the activity should be launched into (Android 8+)
"android:activity.lockTaskMode"BooleanWhether the activity should be launched into “LockTask” mode (Android 9+)

Input arguments

  • Package — package name of the app activity.
  • Activity class — class name of the app activity.
  • Action — action the activity should perform.
  • Data URI — content URI the activity should handle.
  • MIME type — type of data the Data URI is referring to. See MIME type.
  • Category — action category, use an array for multiple categories.
  • Extrasdictionary with extended data, inconvertible entries lacking a conversion type may be excluded.
  • Flags — launch flags.
  • Launch optionsdictionary with activity launch options. (Android 4.1+)
  • Chooser — whether to allow a choice of implicit activity.
Note! This documentation is also accessible within the app from Help & feedback menu.