Android開發點點滴滴

本文在不斷更新中。。。。

1.字符串比較

我在獲取EditText中的內容時，初始時得到的是""，然後我直接判斷edittextString==""，結果怎麼都跳入，記得MFC中比較好像可以直接這樣，然後改為edittextString.equals("")正確。

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

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

和MFC中CString類一樣有很多方法，其中我比較喜歡的是split分割字符串，這個在CString中貌似沒有，但是string沒有find（有indexof可以實現）。（詳細見點此）

3.int與string轉換

4.組件的操作

android中組件的操作都是通過id來實現的（findViewById()），對於一組組件的操作，我首先想到，id是int型的，那我直接對於id可以數學操作，得到我想要的id，然後findViewById()，例如

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

id=0x7f050000+timeInt*7+weekInt;
textView=(TextView)findViewById(id);但是發現這樣並不好（移植性等）

然後發現可以定義一個id的int型數組，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   
};這樣操作起來，和數組序號對應以來，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.數據庫操作

6.布局