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;  
    }