android执行外部命令、检测文件是否存在、自动检测U盘路径

     private final String UDiskFileName = "/2969_logo/bootfile.image";
     private final String LocalFile = "/tmp/factory/bootfile.image";
     private boolean setBootLogo()
     {
         String tmp = getExternalStorageDirectory();
         String USBPath = tmp.split("\n")[0];
         if(USBPath.length() <= 0)
         {
             Toast.makeText(TSBPanelMode.this, "没有检测到U盘",
                            Toast.LENGTH_LONG).show();
             return false;
         }
         String UDiskFile = USBPath + UDiskFileName;
         Log.d("XYP_DEBUG", UDiskFile);
         if (!fileIsExists(UDiskFile))
         {
             Toast.makeText(TSBPanelMode.this, "U盘中没有文件" + UDiskFileName,
                            Toast.LENGTH_LONG).show();
             return false;
         }

         try
         {
             String tmpcmd = "mount -o remount,rw /system ;\n"+
                             "rm " + LocalFile + "; \n" +
                             "cp " + UDiskFile + " " + LocalFile +";\n" +
                             "ls;\n";
             String[] cmd = new String[] { "/bin/sh","-c", tmpcmd};
             Runtime runtime = Runtime.getRuntime();
             Process proc = runtime.exec(cmd);
             InputStream is = proc.getInputStream();
             InputStreamReader isr = new InputStreamReader(is);
             String line;
             BufferedReader br = new BufferedReader(isr);
             while ((line = br.readLine()) != null)
             {
                 Log.d(TAG, line);
             }
             mTvManager.saveFactoryData();
             Log.d("XYP_DEBUG", "==== have done ====");
         }catch(Exception e)
         {
             e.printStackTrace();
             return false;
         }

         if (!fileIsExists(LocalFile))
         {
             Toast.makeText(TSBPanelMode.this, "U盘中文件没有复制到本地存储空间",
                            Toast.LENGTH_LONG).show();
             return false;
         }
         return true;
     }
     private boolean fileIsExists(String strFile)
     {
         try
         {
             File f=new File(strFile);
             if(!f.exists())
             {
                     return false;
             }
         }
         catch (Exception e)
         {
             e.printStackTrace();
             return false;
         }
         return true;
     }
     public static String getExternalStorageDirectory(){
         String dir = new String();
         try {
             Runtime runtime = Runtime.getRuntime();
             Process proc = runtime.exec("mount");
             InputStream is = proc.getInputStream();
             InputStreamReader isr = new InputStreamReader(is);
             String line;
             BufferedReader br = new BufferedReader(isr);
             while ((line = br.readLine()) != null) {
                 if (line.contains("fuse")) {
                     String columns[] = line.split(" ");
                     if (columns != null && columns.length > 1) {
                         if(columns[1].contains("emulated"))
                             continue;
                         dir = dir.concat(columns[1] + "\n");
                     }
                 }
             }
         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return dir;
     }