Android开发点点滴滴

本文在不断更新中。。。。

1.字符串比较

我在获取EditText中的内容时，初始时得到的是""，然后我直接判断edittextString==""，结果怎么都跳入，记得MFC中比较好像可以直接这样，然后改为edittextString.equals("")正确。

[java]
if(!tmpString.equals(""))
{
tmpString+="/";
}

if(!tmpString.equals(""))
{
tmpString+="/";
}2.string操作

和MFC中CString类一样有很多方法，其中我比较喜欢的是split分割字符串，这个在CString中貌似没有，但是string没有find（有indexof可以实现）。（详细见点此）

3.int与string转换

4.组件的操作

android中组件的操作都是通过id来实现的（findViewById()），对于一组组件的操作，我首先想到，id是int型的，那我直接对于id可以数学操作，得到我想要的id，然后findViewById()，例如

[java]
id=0x7f050000+timeInt*7+weekInt;
textView=(TextView)findViewById(id);

id=0x7f050000+timeInt*7+weekInt;
textView=(TextView)findViewById(id);但是发现这样并不好（移植性等）

然后发现可以定义一个id的int型数组，例如

[java]
int[] weeks=new int[]{
            R.id.week1,
            R.id.week2,
            R.id.week3,
            R.id.week4,
            R.id.week5,
            R.id.week6,
            R.id.week7,
            R.id.week8,
            R.id.week9,
            R.id.week10,
            R.id.week11,
            R.id.week12,
            R.id.week13,
            R.id.week14,
            R.id.week15,
            R.id.week16,
            R.id.week17,
            R.id.week18,
            R.id.week19,
            R.id.week20
};

int[] weeks=new int[]{
   R.id.week1,
   R.id.week2,
   R.id.week3,
   R.id.week4,
   R.id.week5,
   R.id.week6,
   R.id.week7,
   R.id.week8,
   R.id.week9,
   R.id.week10,
   R.id.week11,
   R.id.week12,
   R.id.week13,
   R.id.week14,
   R.id.week15,
   R.id.week16,
   R.id.week17,
   R.id.week18,
   R.id.week19,
   R.id.week20
};这样操作起来，和数组序号对应以来，操作很方便，

[java]
for(int i=0;i<weeks.length;i++)
{
checkBox=(CheckBox)findViewById(weeks[i]);
checkBox.setChecked(false);
}

for(int i=0;i<weeks.length;i++)
{
checkBox=(CheckBox)findViewById(weeks[i]);
checkBox.setChecked(false);
}5.数据库操作

6.布局

补充：移动开发 , Android ,