onKeyEvent和辅助功能服务

Question

我的用户将使用TalkBack或其他一些Accessible Service.我想在我们的应用程序中捕获onKeyEvent事件,但事件将被分派到启用的Accessibility Services.我创建了以下基本辅助功能服务.

public class Accessibility_Service extends AccessibilityService {

    private String TAG = Accessibility_Service.class.getSimpleName();

    @Override
    public boolean onKeyEvent(KeyEvent event) {
        int action = event.getAction();
        int keyCode = event.getKeyCode();
        if (action == KeyEvent.ACTION_UP) {
            if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
                Log.d("Hello", "KeyUp");
            } else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
                Log.d("Hello", "KeyDown");
            }
            return true;
        } else {
            return super.onKeyEvent(event);
        }
    }

    /**
     * Passes information to AccessibilityServiceInfo.
     */
    @Override
    public void onServiceConnected() {
        Log.v(TAG, "on Service Connected");
        AccessibilityServiceInfo info = new AccessibilityServiceInfo();
        info.packageNames = new String[] { "com.camacc" };
        info.eventTypes = AccessibilityEvent.TYPES_ALL_MASK;
        info.notificationTimeout = 100;
        info.feedbackType = AccessibilityServiceInfo.FEEDBACK_SPOKEN;
        setServiceInfo(info);

    }// end onServiceConnected

    /**
     * Called on an interrupt.
     */
    @Override
    public void onInterrupt() {
        Log.v(TAG, "***** onInterrupt");

    }// end onInterrupt

    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        // TODO Auto-generated method stub

    }
}// end Accessibility_Service class

当我检查logcat时,我没有得到任何回复.是否可以在TalkBack或其他此类辅助功能服务之前使用降低音量和向上事件？

谢谢.

编辑:

添加以下标志仍然没有运气:

info.flags = AccessibilityServiceInfo.FLAG_REQUEST_FILTER_KEY_EVENTS;

Answer 1

尝试在xml资源中配置这样的辅助功能服务,如果您需要更多信息,请查看:https://developer.android.com/guide/topics/ui/accessibility/services.html

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service
xmlns:android="http://schemas.android.com/apk/res/android"
android:accessibilityEventTypes="typeContextClicked|typeViewClicked"
android:packageNames="com.example.andres.eventcapture"
android:accessibilityFlags="flagRequestFilterKeyEvents"
android:accessibilityFeedbackType="feedbackAllMask"
android:notificationTimeout="50"
android:canRetrieveWindowContent="true"
android:settingsActivity=""
android:canRequestFilterKeyEvents="true"
/>

它工作得很好!

Answer 2

我认为当你扩展 AccessibilityService 时，你必须实现“onAccessibilityEvent()”方法；比如：

@Override
public void onAccessibilityEvent(AccessibilityEvent event) {
    final int eventType = event.getEventType();
    switch(eventType) {
        case AccessibilityEvent.TYPE_VIEW_CLICKED:
            do somthing
            break;
        case AccessibilityEvent.TYPE_VIEW_FOCUSED:
            do somthing
            break;
    }