- Widget resizing available from Android 3.1 onward
- App widget HOST: Holds app widgets
- App widget PROVIDER: Publishs app widgets

AppWidgetProviderInfo
- Metadata for widgets: layout, update frequency, AppWidgetProvider class

AppWidgetProvider
- Interface to app widget

- App widgets may have configuration activities
  - Launches when app widget is added

Problem: Restoring widgets after reboot


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- Android widgets are called AppWidgets

- We can either
  a) Write our own widget framework
     - Doable, but requires to be well-designed
     - Making it support Android AppWidgets (and thus, the Android widget framework) is not feasible
  b) Use the Android widget framework, with the limitations described below

- The following applies to devices with Android versions prior to 4.1:
  - We CAN make an application that can host Android app widgets
    - These widgets can be from any application
  - We CANNOT do our own widget picker in case we want to include Android AppWidgets as well
    - We MUST use the default OEM-provided picker in case we want to go the Android AppWidgets route
    - TODO: ADW Laucher has its own picker in Android 4.2, at least. Check if true on 2.x.
    
  - We CANNOT add widgets without the user manually picking them (i.e. programmatically)
    - Widgets CANNOT be restored after the device is rebooted.
    - The user MUST add the widgets manually after reboot, each time.
      - So why does every device's default launcher allow this? Read on.

- Technical explanation:
  - Android requires that widgets are bound to AppWidgetService (internal component)
    - This requires the BIND_APPWIDGET permission
      - Available only for system apps, i.e. ones signed with platform certificate
      - NOT available for regular installable SDK apps prior to Android 4.1
- This limitation has apparently been lifted in Android 4.1 (Jelly Bean)
  - Still no way to make it work with Android 4.0 and below
  - User is asked for permission to bind widgets to the application
    - Permitted application is stored internally
    - After being granted such a permission, adding widgets programmatically MIGHT work. But there are no guarantees unless time is spent to try it out.
      - Even so, since our solution must work in 2.2-4.0 devices as well, using AppWidgets is a no-go.

Launchers that use Android AppWidget framework:
- Nova Launcher
- Holo Launcher
- ADW Launcher