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Android Introduction

Android Introduction. Graphical User Interface. Goal. Familiarize with the main types of GUI components Concepts: Layouts Widgets Menus. View Hierarchy. All the views in a window are arranged in a tree You show the tree by calling setContentView(rootNode) in the activity. Layout.

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Android Introduction

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  1. Android Introduction Graphical User Interface

  2. Goal • Familiarize with the main types of GUI components • Concepts: • Layouts • Widgets • Menus

  3. View Hierarchy • All the views in a window are arranged in a tree • You show the tree by calling setContentView(rootNode) in the activity

  4. Layout • Defines how elements are positioned relative to each other (next to each other, under each other, in a table, grid, etc.) • Can have a different layouts for each ViewGroup

  5. Widgets • All are View objects • Examples: • TextFields • EditFields • Buttons • Checkboxes • RadioButtons • etc.

  6. UI Events • Usually handled by defining a Listener of the form On<something>Listener and register it with the View • For example: • OnClickListener() for handling clicks on Buttons or Lists • OnTouchListener() for handling touches • OnKeyListerner() for handling key presses • Alternatively, Override an existing callback if we implemented our own class extending View

  7. Menus • Context Menu • Sub-menu • Options Menu

  8. Menus (continued) MenuItem MenuItem Has 0 or more Has 0 or more Has 0 or more SubMenu

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