Android 7 introduced multi-window support, a system whereby more than one activity is displayed on the screen at any one time. This feature now forms the foundation of providing support for foldable devices. The three modes provided by multi-window support are split-screen, freeform and picture-in-picture. In split-screen mode, the screen is split either horizontally or vertically into two panes with an activity displayed in each pane. Freeform mode, which is only supported on certain Android devices, allows each activity to appear in a separate, movable and resizable window. As outlined in this chapter, a number of methods and property settings are available within the Android SDK to detect, respond to and control multi-window behavior within an app.
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