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 /*
     * Log日志记录打印
     */
    public static void write_sys_log(String strlog) {
          try {  
              strlog = "
" + strlog + "

";
              String fileName="/sdcard/hlog.txt";

              File file = new File(fileName);  
              if( !file.exists()) {  
                  file.createNewFile();  
              }  
              FileWriter writer = new FileWriter(fileName, true);
              writer.write(strlog);
              writer.close();

          } catch(Exception e) {  
          }
      }
    
    /**
     * 删除命令
     */
    public static void commandExec(String cmd) {

        try {

            Runtime.getRuntime().exec(cmd);

        } catch (IOException e) {

            e.printStackTrace();
        }
    }

 二、String字符串十进制/十六进制相互转换

private static String hexString="0123456789ABCDEF";

public static String strEncode10_16(String str10) {
        byte[] bytes=str10.getBytes(); 
        StringBuilder sb= new StringBuilder(bytes.length * 2);
        
        for(int i=0;i<bytes.length;i++) 
        { 
            sb.append(hexString.charAt((bytes[i]&0xf0)>>4)); 
            sb.append(hexString.charAt((bytes[i]&0x0f)>>0)); 
        } 
        return sb.toString();     
    }

public String strDecode16_10(String str16) {
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream(str16.length()/2);
        
        for(int i=0;i<str16.length();i+=2) 
            baos.write((hexString.indexOf(str16.charAt(i)) << 4 | hexString.indexOf(str16.charAt(i+1)))); 
            return new String(baos.toByteArray());     
    }