Question

我是Android上的辅助功能新手。在浏览课程和文档时，我在TYPE_ACCESSIBILITY_OVERLAY课程中遇到了WindowManager。

documentation说（只有相关文字）

例如，如果存在全屏辅助功能覆盖可触摸，它下面的窗户将是一个内省可访问性服务，即使它们被可触摸的覆盖窗口。

所以我开始实现这一目标，全屏可访问性覆盖并尝试内省它下面的窗口

展开AccessibilityService并在调用onServiceConnected时添加了我的全屏叠加层（添加叠加层的灵感来自here）

@Override
protected void onServiceConnected() {
    WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
    FrameLayout mLayout = new FrameLayout(this);
    WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
    lp.type = WindowManager.LayoutParams.TYPE_ACCESSIBILITY_OVERLAY;
    lp.format = PixelFormat.TRANSLUCENT;
    lp.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
    lp.width = WindowManager.LayoutParams.MATCH_PARENT;
    lp.height = WindowManager.LayoutParams.MATCH_PARENT;
    lp.gravity = Gravity.TOP;
    wm.addView(mLayout, lp);

    mLayout.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // Here I'm getting the touch events on the overlay I added
            return false;
        }
    });
}

现在，问题是，我如何反省或找到此叠加层下面的窗口？即使在onAccessibilityEvent回调中，我也会得到这个叠加窗口。 getWindows()始终有size of 1。它不反驳上面针对TYPE_ACCESSIBILITY_OVERLAY做出的断言吗？

相关信息：要在叠加层上接收触摸事件，我已在服务设置中禁用了touchExplorationMode

android:canRequestTouchExplorationMode="false"

Answer 1

您的配置似乎缺少flagRetrieveInteractiveWindows。这些属性和窗口布局参数配置应该可以正常工作，无需您禁用canRequestTouchExplorationMode以获取事件并让getWindows返回您下面的AccessibilityWindowInfo实例：

    <?xml version="1.0" encoding="utf-8"?>
    <accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
        android:packageNames="test.demo.com.tests"
        android:accessibilityEventTypes="typeAllMask"
        android:accessibilityFlags="flagRetrieveInteractiveWindows|flagReportViewIds|flagIncludeNotImportantViews"
        android:accessibilityFeedbackType="feedbackAllMask"
        android:notificationTimeout="100"
        android:canRetrieveWindowContent="true"
        />

关于服务连接：

    @Override
    protected void onServiceConnected() {
        WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        FrameLayout layout = new FrameLayout(this);

        WindowManager.LayoutParams params = new WindowManager.LayoutParams(WindowManager.LayoutParams.MATCH_PARENT,
            WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_ACCESSIBILITY_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_FULLSCREEN |
                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE|
                WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS| 
                WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
            PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.TOP;

        windowManager.addView(layout, params);
        layout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                //You can either get the information here or on onAccessibilityEvent                 
                return false;
            }
        });
    }

修改：

添加FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS以完成全屏并删除canRequestTouchExplorationMode，因为不应包含与此属性关联的标记，因此无用。

全屏TYPE_ACCESSIBILITY_OVERLAY

1 个答案: