Android Dialog 设置字体大小的具体方法

public abstract View getDecorView ()
Added in API level 1
Retrieve the top-level window decor view (containing the standard window frame/decorations and the client's content inside of that), which can be added as a window to the window manager.

Note that calling this function for the first time "locks in" various window characteristics as described in

    /**
     * 显示 进度对话框
     * @param message 消息
     * @param cancel 是否可取消
     * @param textsize 字体大小
     */
    protected final void showProgressDialog(String message,boolean cancel,int textsize)
    {
        // TODO Auto-generated method stub
        mProgress = new ProgressDialog(this);
        mProgress.setMessage(message);
        mProgress.setCancelable(cancel);
        mProgress.setOnCancelListener(null);
        mProgress.show();

        setDialogFontSize(mProgress,textsize);
    }
    private void setDialogFontSize(Dialog dialog,int size)
    {
        Window window = dialog.getWindow();
        View view = window.getDecorView();
        setViewFontSize(view,size);
    }
    private void setViewFontSize(View view,int size)
    {
        if(view instanceof ViewGroup)
        {
            ViewGroup parent = (ViewGroup)view;
            int count = parent.getChildCount();
            for (int i = 0; i < count; i++)
            {
                setViewFontSize(parent.getChildAt(i),size);
            }
        }
        else if(view instanceof TextView){
            TextView textview = (TextView)view;
            textview.setTextSize(size);
        }
    }