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Activity & View

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March 10, 2014
Technology
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Activity & View

Learn the basics of Android's Activity and View concepts

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saulpower

March 10, 2014
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Transcript

  1. Learn Android Activities & Views

  2. Goals Create an Activity Create an XML Layout

  3. Activity Basic Building Block Lifecycle State View Controller

  4. Activity Transition Between Activities Phone Calls App Killed

  5. Activity State Bundle onSaveInstanceState() onRestoreInstanceState()

  6. Activity XML Layouts Compiled at build Views & ViewGroups Custom

    Views setContentView()

  7. View Hierarchy Views & View Groups Required: Width & Height

    dp, px, pt wrap_content match_parent Layout Engine Measure Pass Layout Pass

  8. Views Widgets TextView Displaying text EditText Input text Button

  9. ViewGroups Widget Container LinearLayout Stack Vertical/Horizontal (orientation) Weight 33

  10. ViewGroups Widget Container LinearLayout Stack Vertical/Horizontal (orientation) Weight RelativeLayout Relative

    to parent or children Overlap Nesting