读入和写入内存

引用来的没有亲测 备用吧

FileOutputStream fos = openFileOutput("urls.txt", Context.MODE_PRIVATE); 
fos.write("Alex".getBytes()); 
fos.close();  
FileInputStream fis = openFileInput("urls.txt"); 
int c; 
while((c=fis.read())!=-1) 
        { 
 
            k += (char)c; 
        } 
fis.close();

http://developer.android.com/guide/topics/data/data-storage.html#filesInternal