Android进阶篇-WindowManager

        WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                PixelFormat.TRANSLUCENT);
        lp.gravity = Gravity.LEFT | Gravity.TOP;
        lp.x = 100;
        lp.y = 100;
        WindowManager windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        ImageView view = new ImageView(this);
        view.setBackgroundResource(R.drawable.icon);
        windowManager.addView(view, lp);