要解決Android ViewPager懸浮窗問題，你可以嘗試以下方法：

1. 使用WindowManager來創建一個懸浮窗口，并將ViewPager添加到該懸浮窗口上。

// 創建懸浮窗口
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
        WindowManager.LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.TRANSLUCENT);

WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
ViewGroup.LayoutParams viewPagerParams = new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT,
        ViewGroup.LayoutParams.MATCH_PARENT);
ViewPager viewPager = new ViewPager(context);
viewPager.setLayoutParams(viewPagerParams);

// 將ViewPager添加到懸浮窗口上
windowManager.addView(viewPager, params);

2. 為ViewPager設置OnTouchListener來處理觸摸事件，以實現懸浮窗口的拖動效果。

viewPager.setOnTouchListener(new View.OnTouchListener() {
    private int initialX;
    private int initialY;
    private float initialTouchX;
    private float initialTouchY;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                initialX = params.x;
                initialY = params.y;
                initialTouchX = event.getRawX();
                initialTouchY = event.getRawY();
                return true;
            case MotionEvent.ACTION_MOVE:
                params.x = initialX + (int) (event.getRawX() - initialTouchX);
                params.y = initialY + (int) (event.getRawY() - initialTouchY);
                windowManager.updateViewLayout(viewPager, params);
                return true;
        }
        return false;
    }
});

請注意，使用懸浮窗口需要適當的權限申請，并且在不需要時要及時移除懸浮窗口。