| Built-in front calls / Genero Mobile Android front calls | |
Starts an external Android application (activity), and returns to the GMA application immediately.
ui.Interface.frontCall("android","startActivity",
[action, data, category, type, component, extras],
[])
The "startActivity" front call starts an external application (Android activity), and returns to the GMA application immediately after invoking the activity.
This front call is similar to the RUN WITHOUT WAITING statement: It allows the user to switch between the GMA and the launched application.
The parameters passed to this front call are used to build an Android "intent" object to start an "activity". For more details about Android intent object, refer to the Android "Intent" defintion.
The action parameter defines the Android activity to perform, such as "android.intent.action.MAIN", "android.intent.action.VIEW", and so on.
The data (optional) parameter contains the data to operate on. This is the main parameter to transmit data to the activity. It can for example be an URL.
The category (optional) parameter contains a comma separated list of categories, where a category gives additional information about the action to execute. For example, "android.intent.category.LAUNCHER" means it should appear in the Launcher as a top-level application. See the Android documentation for details about possible categories for a given activity.
The type (optional) parameter defines the type (in fact, a MIME type) of the activity data. Normally the type is inferred from the data itself. By setting this attribute, you disable that evaluation and force an explicit type.
The component (optional) parameter defines the name of a component class to use for the intent. Normally this is determined by looking at the other information in the intent. The component name typically specified as "apk-package-name/java-class-name" or "java-class-name" (the APK package name is optional). If the APK package is not specified, GMA considers that the Java class is included in the current APK.
The extras (optional) parameter specifies a JSON string containing parameters to pass to the activity. This can be used to provide extended information to the component. For example, with an action sending an e-mail message, the extra data can include data to supply a subject, body, for the e-mail.
The following code example starts the VIEW Android activity to show an image. The Genero program flow will continue after this call, but the started activity will be shown. Note that such action is rather performed with a launchurl front call.
CALL ui.Interface.frontCall(
"android", "startActivity",
[ "android.intent.action.VIEW",
"file:///storage/path_to_image_file",
NULL, "image/*" ],
[ ] )