Android Accessibility 辅助功能简单介绍

<application> 
 <service android:name=".MyAccessibilityService" 
   android:label="@string/accessibility_service_label"> 
  <intent-filter> 
   <action android:name="android.accessibilityservice.AccessibilityService" /> 
  </intent-filter> 
 </service> 
 <uses-permission android:name="android.permission.BIND_ACCESSIBILITY_SERVICE" /> 
</application> 

private void setServiceInfo(int feedbackType) { 
  AccessibilityServiceInfo info = new AccessibilityServiceInfo(); 
  // We are interested in all types of accessibility events. 
  info.eventTypes = AccessibilityEvent.TYPES_ALL_MASK; 
  // We want to provide specific type of feedback. 
  info.feedbackType = feedbackType; 
  // We want to receive events in a certain interval. 
  info.notificationTimeout = EVENT_NOTIFICATION_TIMEOUT_MILLIS; 
  // We want to receive accessibility events only from certain packages. 
  info.packageNames = PACKAGE_NAMES; 
  setServiceInfo(info); 
} 

<service android:name=".MyAccessibilityService"> 
 ... 
 <meta-data 
  android:name="android.accessibilityservice" 
  android:resource="@xml/accessibility_service_config" /> 
</service> 

<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android" 
  android:description="@string/accessibility_service_description" 
  android:packageNames="com.example.android.apis" 
  android:accessibilityEventTypes="typeAllMask" 
  android:accessibilityFlags="flagDefault" 
  android:accessibilityFeedbackType="feedbackSpoken" 
  android:notificationTimeout="100" 
  android:canRetrieveWindowContent="true" 
  android:settingsActivity="com.example.android.accessibility.ServiceSettingsActivity" 
/>