Android 判断udisk是否mount上

            File udiskDir = Environment.getExternalUDiskStorageDirectory();
            String udiskDirStr = udiskDir.getAbsolutePath();

            String state = Environment.getStorageState(udiskDir);
            Log.i(TAG,udiskDirStr + " state: " + state);
            if(Environment.MEDIA_MOUNTED.equals(state)){

                Log.i(TAG, udiskDirStr + " mounted");
            }

笨方法： 执行 df 判断          

            boolean udiskMounted = false;
            {
                String s = null;

            try {
                Log.d(TAG, "On RunCommand");
                Process p = Runtime.getRuntime().exec("df");

                BufferedReader stdInput = new BufferedReader(new
                        InputStreamReader(p.getInputStream()));


                // read the output from the command
                while ((s = stdInput.readLine()) != null) {
                    Log.d(TAG, "Read output: " +s);
                    if (s.contains(udiskDirStr)){

                    udiskMounted = true;
                    break;
                    }
                }

            } catch (IOException e) {
                e.printStackTrace();
                }

            }

            if ( !udiskMounted){

                Toast.makeText(getActivity(), getString(R.string.log_msg_udisk_notok), Toast.LENGTH_LONG).show();
                return;
            }

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