Android覆盖布局位于接收触摸的所有窗口之上

Question

我创建了一个使用以下代码显示在所有应用程序和窗口之上的视图:

        //These three are our main components.
    WindowManager wm;
    LinearLayout ll;
    WindowManager.LayoutParams ll_lp;

    //Just a sample layout parameters.
    wm = (WindowManager) getSystemService(WINDOW_SERVICE);
    ll_lp = new WindowManager.LayoutParams();
    ll_lp.format = PixelFormat.TRANSLUCENT;
    ll_lp.height = WindowManager.LayoutParams.FILL_PARENT;
    ll_lp.width = WindowManager.LayoutParams.FILL_PARENT;
    ll_lp.gravity = Gravity.CLIP_HORIZONTAL | Gravity.TOP;

    //This one is necessary.
    ll_lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

    //Play around with these two.
    ll_lp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
    ll_lp.flags = ll_lp.flags | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

    //This is our main layout.
    ll = new LinearLayout(this);
    ll.setBackgroundColor(android.graphics.Color.argb(50, 255, 255, 255));
    ll.setHapticFeedbackEnabled(true);
    ll.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Toast.makeText(getApplicationContext(), "TOUCHED", Toast.LENGTH_SHORT).show();
            return false;
        }
        });

    //And finally we add what we created to the screen.
    wm.addView(ll, ll_lp);

由于设置了FLAG_NOT_TOUCHABLE,因此它仅显示视图,但不会接收任何触摸事件.视图后面的应用程序接收所有触摸事件.但是,如果我没有设置标志,那么只有视图接收触摸,导致其后面的应用程序不接收任何标志.

有没有办法让视图和它背后的应用程序接收触摸？我试过回复假,但仍然一样.

任何帮助将不胜感激!

Answer 1

如果我没有弄错的话，后台的视图不会接收触摸事件，因为它被系统过滤掉以防止“点击劫持”漏洞。

您可以通过使用View.setFilterTouchesWhenObscured(Boolean)方法关闭后台视图的触摸事件过滤来绕过此系统功能。