Accessibility

先上官网地址 https://developer.android.com/guide/topics/ui/accessibility/services.html
下面的是例子 https://developer.android.com/training/accessibility/index.html

然后是codelab 看看 https://codelabs.developers.google.com/codelabs/developing-android-a11y-service/index.html?index=..%2F..%2Findex#0

这是codelab github上的地址 https://github.com/googlecodelabs/android-accessibility
一、简单实现
1、创建一个 MyAccessibilityService类 继承 AccessibilityService

…

public class MyAccessibilityService extends AccessibilityService {

 @Override
 public void onAccessibilityEvent(AccessibilityEvent event) {
 }

 @Override
 public void onInterrupt() {
}

}
…

2、创建一个values下创建XML文件夹

3、 实现 onServiceConnected()

@Override
public void onServiceConnected() {
     // Set the type of events that this service wants to listen to.  Others
     // won't be passed to this service.
     info.eventTypes = AccessibilityEvent.TYPE_VIEW_CLICKED |
            AccessibilityEvent.TYPE_VIEW_FOCUSED;

     // If you only want this service to work with specific applications, set their
    // package names here.  Otherwise, when the service is activated, it will listen
    // to events from all applications.
    info.packageNames = new String[]
            {"com.example.android.myFirstApp", "com.example.android.mySecondApp"};

    // Set the type of feedback your service will provide.
    info.feedbackType = AccessibilityServiceInfo.FEEDBACK_SPOKEN;

    // Default services are invoked only if no package-specific ones are present
    // for the type of AccessibilityEvent generated.  This service *is*
    // application-specific, so the flag isn't necessary.  If this was a
    // general-purpose service, it would be worth considering setting the
    // DEFAULT flag.

    // info.flags = AccessibilityServiceInfo.DEFAULT;

     info.notificationTimeout = 100;

     this.setServiceInfo(info);
     Log.i("test","测试");
}

4、实现 onAccessibilityEvent方法

@Override
public void onAccessibilityEvent(AccessibilityEvent event) {
 final int eventType = event.getEventType();
 String eventText = null;
 switch(eventType) {
    case AccessibilityEvent.TYPE_VIEW_CLICKED:
        eventText = "Focused: ";
        break;
    case AccessibilityEvent.TYPE_VIEW_FOCUSED:
        eventText = "Focused: ";
        break;
 }

 eventText = eventText + event.getContentDescription();

 // Do something nifty with this text, like speak the composed string
// back to the user.
 speakToUser(eventText);
}
...

然后就可以开启辅助功能，看下log