ActionBar(ActionBarCompat)教程(part1预备知识及初次上手).pptx

ActionBarCompat Tutorial Part 1-Prepare and Setup,http:/www.mobiletuts.me M,2019/5/26,Mobiletuts.me ,Action Bar,2019/5/26,Mobiletuts.me ,The 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).,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.,2019/5/26,Mobiletuts.me ,ActionBarActivity or Activity?,Google Android team released a new backward-compatible Action Bar implementation called ActionBarCompat thats 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.,2019/5/26,Mobiletuts.me ,ActionBarActivity for Backward Compatibility,Therefore use ActionBarActivity if you need to use ActionBar while supporting sdk level lower than 11.,2019/5/26,Mobiletuts.me ,Get Started with ActionBarCompat,ActionBarCompat is a new API in the Android Support Library that allows you to add an Action Bar to applications targeting minSdkVersion 7 or greater. The API and integration have been designed to closely mirror the existing framework APIs, giving you an easy migration path for your existing apps.,2019/5/26,Mobiletuts.me ,Add ActionBarCompat as a project dependency,1. Android Studio or Eclipse+ADT go to Tools-Android-SDK Manager,2. Check if the Android Support Library (revision 18) has been installed.,The version of Android support library ( Revision 18 ) is released with a new library called appcompat under the package android.support.v7.The new library facilitates users to implement action bar back up to Android 2.1 ( API Level 7 ) .,2019/5/26,Mobiletuts.me ,Adding ActionBarCompat support library,Eclipse Make sure you have downloaded the Android Support Library using the SDK Manager. Create a libs/ directory in the root of your application project. Copy the JAR files from your Android SDK installation directory /extras/android/support/v7/appcompat/libs/android-support-v4.jar /extras/android/support/v7/appcompat/libs/android-support-v7-appcompat.jar into your applications project libs/ directory. Right click the JAR file and select Build Path Add to Build Path. Android Studio Make sure you have downloaded the Android Support Repository using the SDK Manager. Open the build.gradle file for your application. Add the support library to the dependencies section. For example, to add the v7 appcompat library, add the following lines: dependencies compile com.android.support:appcompat-v7:18.0.0 ,2019/5/26,Mobiletuts.me ,Create New Android Project,2019/5/26,Mobiletuts.me ,Create New Android Project,2019/5/26,Mobiletuts.me ,Dependency,The Gradle build script dependency identifier for this library is as follows: com.android.support:appcompat-v7:18.0.0+ This dependency notation specifies the release version 18.0.0 or higher.,2019/5/26,Mobiletuts.me ,When using default Activity,2019/5/26,Mobiletuts.me ,Default Activity support ActionBar on level higher than API 11,2019/5/26,Mobiletuts.me ,Running on API17,Use ActionBarActivity for Backward Compatibility,2019/5/26,Mobiletuts.me ,Using ActionBarActivity instead of Activity,Done? Not yet, if you compile and run now, you will run into fata error caused by theme setting.,Error Caused by Theme Setting,2019/5/26,Mobiletuts.me ,This is cause by theme setting. When using ActionBarCompat, you can only use a Theme.AppCompat theme or its descendant (for customized theme).,Update Style Resources,2019/5/26,Mobiletuts.me ,The first things to update are your Activity themes so they use a Theme.AppCompat theme. If youre currently using one of the Theme.Holo themes then just replace this with the related Theme.AppCompat theme. For instance if you have the following in your AndroidManifest.xml: You would change it to: ,UseTheme.AppCompat theme or its descendant,Update Style Resources,2019/5/26,Mobiletuts.me ,UseTheme.AppCompat theme or its descendant,If you dont want to change your activities theme setting one by one, you can change the theme setting for application in AndroidManifest.xml: ,Becareful with values-v11/14,When you update the style resource files, do update all the styles.xml in values folder and the possible values-v11 and values-v14 folder. Cause your app may load styles.xml file in values-v1X folder according to target Android API level!,2019/5/26,Mobiletuts.me ,Try again, it works now!,2019/5/26,Mobiletuts.me ,Running on API17,Add More Actions on Action Bar,2019/5/26,Mobiletuts.me ,In the following sections, I will show how to add Actions such as Search to Action Bar.,You can download these icons which you can use for Actions from Download the Action Bar Icon Pack Then copy the icons you need to drawable folders. Here I copied 2_action_search.png files to drawable-hdpi, drawable-xhdpi and drawable-mdpi folders.,Structure of Action Bar Icon Pack,2019/5/26