《ActionBarActionBarCompat教程part1预备知识及初次上手.pptx

ActionBarCompat TutorialPart 1-Prepare and Setup http://www.mobiletuts.mehhttp://www.mobiletuts.mettp://www.mobiletuts.meMobiletuts.me@Mobiletuts.me mobiletuts.me@Action BarThe action bar is a window feature that identifies the user location, and provides user actions and navigation modes. Using the action bar offers your users a familiar interface across applications that the system gracefully adapts for different screen configurations.Figure 1. An action bar that includes the [1] app icon, [2] two action items, and [3] action overflow.The action bar provides several key functions:Provides a dedicated space for giving your app an identity and indicating the users location in the app.Makes important actions prominent and accessible in a predictable way (such as Search).Supports consistent navigation and view switching within apps (with tabs or drop-down lists).Mobiletuts.me mobiletuts.me@ActionBarActivity or Activity?If you want to set title , logo, navigation modes for an ActionBar, you need to get a reference to ActionBar.With sdk level higher than 11 (=11), you can directly call getActionBar() in an Activity to fetch a reference of ActionBar which you can configure.For sdk level lower than 11 (=10), however, getActionBar is not supported in an Activity. Mobiletuts.me mobiletuts.me@ActionBarActivity or Activity?Google Android team released a new backward-compatible Action Bar implementation called ActionBarCompat that‘s part of the Support Library r18 during I/O 2013 . The ActionBarCompat APIs let you build the essential Action Bar design pattern into your app, with broad compatibility back to Android 2.1 (sdk7).ActionBarActivity (android.support.v7.app.ActionBarActivity) and ActionBar (android.support.v7.app.ActionBar) was introduced within ActionBarCompat, which can be used essentially as same as Activity with ActionBar features in sdk levels higher than 11.Mobiletuts.me mobiletuts.me@ActionBarActivity for Backward CompatibilityTherefore use ActionBar