PopupWindow的问题

Question

怎么实现让PopupWindow默认为弹出形式？？？

Answer 1

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LayoutInflater inflate = LayoutInflater.from(this);
        setContentView(R.layout.main);
        mWindow = new PopupWindow(this);
        mWindow.setWidth(WindowManager.LayoutParams.FILL_PARENT);
        mWindow.setHeight(WindowManager.LayoutParams.FILL_PARENT);
        View parent = inflate.inflate(R.layout.main, null);
        mWindow.getMaxAvailableHeight(parent);        mWindow.setTouchable(true);
        mWindow.setFocusable(true);
        inflate = LayoutInflater.from(this);
        mRoot = inflate.inflate(R.layout.popup_window, null);
        mWindow.setContentView(mRoot);
        mWindow.setAnimationStyle(R.style.Animations_PopDownMenu);
    }    public void onImageClick(View v){
        mWindow.showAtLocation(getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, 0);
    }