关于呼叫WindowManager.addview()后添加视图的位置

Question

这是问题〜我试图通过调用window manager.addview（）方法将imageView添加到窗口中。但是我发现图像视图在屏幕的中心，而不是左上角。仅当我将WindowManager的重力属性设置为重力时，它才会出现在左上角。重力属性重力的默认值。我研究了Android源代码，但迷失了。

    ImageView img = new ImageView(this);
    img.setImageResource(android.R.drawable.ic_delete);
    WindowManager manager = (WindowManager) this.getSystemService(WINDOW_SERVICE);
    WindowManager.LayoutParams params = new WindowManager.LayoutParams(60,60,WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
            WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS|WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH, PixelFormat.TRANSLUCENT);
    //params.gravity= Gravity.LEFT|Gravity.TOP;
    manager.addView(img, params);

在windowmanager.layoutparams的源代码中，我发现只有在设置重力时，x和y属性才会考虑：

    /**
     * X position for this window.  With the default gravity it is ignored.
     * When using {@link Gravity#LEFT} or {@link Gravity#START} or {@link Gravity#RIGHT} or
     * {@link Gravity#END} it provides an offset from the given edge.
     */
    @ViewDebug.ExportedProperty
    public int x;
    /**
     * Y position for this window.  With the default gravity it is ignored.
     * When using {@link Gravity#TOP} or {@link Gravity#BOTTOM} it provides
     * an offset from the given edge.
     */
    @ViewDebug.ExportedProperty
    public int y;

但是这还不够

任何提示都将不胜感激。

Answer 1

我猜这会导致：

WindowManager.LayoutParams.TYPE_SYSTEM_ALERT