Example usage for android.view.accessibility AccessibilityWindowInfo TYPE_ACCESSIBILITY_OVERLAY

Introduction

In this page you can find the example usage for android.view.accessibility AccessibilityWindowInfo TYPE_ACCESSIBILITY_OVERLAY.

Prototype

int TYPE_ACCESSIBILITY_OVERLAY

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Document

Window type: Windows that are overlaid only by an android.accessibilityservice.AccessibilityService for interception of user interactions without changing the windows an accessibility service can introspect.

Usage

From source file:com.android.talkback.eventprocessor.ProcessorScreen.java

private void updateScreenState(AccessibilityEvent event) {
    switch (event.getEventType()) {
    case AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED:
        // Do nothing if split screen mode is available since it can be covered by
        // TYPE_WINDOWS_CHANGED events.
        if (mIsSplitScreenModeAvailable) {
            return;
        }//from   ww w  . java  2 s.co  m

        mWindowIdA = getWindowId(event);
        break;
    case AccessibilityEvent.TYPE_WINDOWS_CHANGED:
        // Do nothing if split screen mode is NOT available since it can be covered by
        // TYPE_WINDOW_STATE_CHANGED events.
        if (!mIsSplitScreenModeAvailable) {
            return;
        }

        ArrayList<AccessibilityWindowInfo> applicationWindows = new ArrayList<>();
        ArrayList<AccessibilityWindowInfo> systemWindows = new ArrayList<>();
        ArrayList<AccessibilityWindowInfo> accessibilityOverlayWindows = new ArrayList<>();
        List<AccessibilityWindowInfo> windows = mService.getWindows();

        // If there are no windows available, clear the cached IDs.
        if (windows.isEmpty()) {
            mAccessibilityOverlayWindowId = WINDOW_ID_NONE;
            mWindowIdA = WINDOW_ID_NONE;
            mWindowIdB = WINDOW_ID_NONE;
            return;
        }

        for (int i = 0; i < windows.size(); i++) {
            AccessibilityWindowInfo window = windows.get(i);
            switch (window.getType()) {
            case AccessibilityWindowInfo.TYPE_APPLICATION:
                if (window.getParent() == null) {
                    applicationWindows.add(window);
                }
                break;
            case AccessibilityWindowInfo.TYPE_SYSTEM:
                systemWindows.add(window);
                break;
            case AccessibilityWindowInfo.TYPE_ACCESSIBILITY_OVERLAY:
                accessibilityOverlayWindows.add(window);
                break;
            }
        }

        if (accessibilityOverlayWindows.size() == windows.size()) {
            // TODO: investigate whether there is a case where we have more than one
            // accessibility overlay, and add a logic for it if there is.
            mAccessibilityOverlayWindowId = accessibilityOverlayWindows.get(0).getId();
            return;
        }

        mAccessibilityOverlayWindowId = WINDOW_ID_NONE;

        if (applicationWindows.size() == 0) {
            mWindowIdA = WINDOW_ID_NONE;
            mWindowIdB = WINDOW_ID_NONE;

            // If there is no application window but a system window, consider it as a
            // current window. This logic handles notification shade and lock screen.
            if (systemWindows.size() > 0) {
                Collections.sort(systemWindows,
                        new WindowManager.WindowPositionComparator(mService.isScreenLayoutRTL()));

                mWindowIdA = systemWindows.get(0).getId();
            }
        } else if (applicationWindows.size() == 1) {
            mWindowIdA = applicationWindows.get(0).getId();
            mWindowIdB = WINDOW_ID_NONE;
        } else if (applicationWindows.size() == 2) {
            Collections.sort(applicationWindows,
                    new WindowManager.WindowPositionComparator(mService.isScreenLayoutRTL()));

            mWindowIdA = applicationWindows.get(0).getId();
            mWindowIdB = applicationWindows.get(1).getId();
        } else {
            // If there are more than 2 windows, report the active window as the current
            // window.
            for (AccessibilityWindowInfo applicationWindow : applicationWindows) {
                if (applicationWindow.isActive()) {
                    mWindowIdA = applicationWindow.getId();
                    mWindowIdB = WINDOW_ID_NONE;
                    return;
                }
            }
        }
        break;
    }
}

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