android Utils常用代码

一、Log日志写入SD卡、命令执行方法

二、String字符串十进制/十六进制相互转换




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一、Log日志写入SD卡、命令执行方法
 1 /*
 2      * Log日志记录打印
 3      */
 4     public static void write_sys_log(String strlog) {
 5           try {  
 6               strlog = "
" + strlog + "

";
 7               String fileName="/sdcard/hlog.txt";
 8 
 9               File file = new File(fileName);  
10               if( !file.exists()) {  
11                   file.createNewFile();  
12               }  
13               FileWriter writer = new FileWriter(fileName, true);
14               writer.write(strlog);
15               writer.close();
16 
17           } catch(Exception e) {  
18           }
19       }
20     
21     /**
22      * 删除命令
23      */
24     public static void commandExec(String cmd) {
25 
26         try {
27 
28             Runtime.getRuntime().exec(cmd);
29 
30         } catch (IOException e) {
31 
32             e.printStackTrace();
33         }
34     }

二、String字符串十进制/十六进制相互转换

 1 private static String hexString="0123456789ABCDEF";
 2 
 3 public static String strEncode10_16(String str10) {
 4         byte[] bytes=str10.getBytes(); 
 5         StringBuilder sb= new StringBuilder(bytes.length * 2);
 6         
 7         for(int i=0;i<bytes.length;i++) 
 8         { 
 9             sb.append(hexString.charAt((bytes[i]&0xf0)>>4)); 
10             sb.append(hexString.charAt((bytes[i]&0x0f)>>0)); 
11         } 
12         return sb.toString();     
13     }
14 
15 public String strDecode16_10(String str16) {
16         
17         ByteArrayOutputStream baos = new ByteArrayOutputStream(str16.length()/2);
18         
19         for(int i=0;i<str16.length();i+=2) 
20             baos.write((hexString.indexOf(str16.charAt(i)) << 4 | hexString.indexOf(str16.charAt(i+1)))); 
21             return new String(baos.toByteArray());     
22     }