最近看到有人在问这三个参数的含义，其实帮助已经很详细的介绍了这三个参数，看来还是要好好学学英语了，不然连解释都看不懂。

 /**
     * Get a View that displays the data at the specified position in the data set. You can either
     * create a View manually or inflate it from an XML layout file. When the View is inflated, the
     * parent View (GridView, ListView...) will apply default layout parameters unless you use
     * {@link android.view.LayoutInflater#inflate(int, android.view.ViewGroup, boolean)}
     * to specify a root view and to prevent attachment to the root.
     * 
     * @param position The position of the item within the adapter‘s data set of the item whose view
     *        we want.
     * @param convertView The old view to reuse, if possible. Note: You should check that this view
     *        is non-null and of an appropriate type before using. If it is not possible to convert
     *        this view to display the correct data, this method can create a new view.
     * @param parent The parent that this view will eventually be attached to
     * @return A View corresponding to the data at the specified position.
     */

public View getView(int position, View convertView, final ViewGroup parent)三个参数的意思