Android(安卓)mount/unmount SD卡

Android SD 卡的內容需要刷新才能讀取(從其它地方copy[PC或內部存儲])
使用mount/unmount的方法
代碼如下:
private void mountUnmountSD(boolean mMount) {        StorageManager mStorageManager;        mStorageManager = getApplicationContext().getSystemService(StorageManager.class);        final List volumes = mStorageManager.getVolumes();        for (VolumeInfo vol : volumes) {            if (vol.getType() == VolumeInfo.TYPE_PUBLIC) {                if(!mMount && vol.getState() == VolumeInfo.STATE_MOUNTED)                    new UnmountTask(getApplicationContext(), vol).execute();                if(mMount && vol.getState() == VolumeInfo.STATE_UNMOUNTED) {                    new MountTask(getApplicationContext(), vol).execute();                }            }        }    }    public static class MountTask extends AsyncTask {        private final Context mContext;        private final StorageManager mStorageManager;        private final String mVolumeId;        public MountTask(Context context, VolumeInfo volume) {            mContext = context.getApplicationContext();            mStorageManager = mContext.getSystemService(StorageManager.class);            mVolumeId = volume.getId();        }        @Override        protected Exception doInBackground(Void... params) {            try {                mStorageManager.mount(mVolumeId);                return null;            } catch (Exception e) {                return e;            }        }        @Override        protected void onPostExecute(Exception e) {        }    }    public static class UnmountTask extends AsyncTask {        private final Context mContext;        private final StorageManager mStorageManager;        private final String mVolumeId;        private final String mDescription;        public UnmountTask(Context context, VolumeInfo volume) {            mContext = context.getApplicationContext();            mStorageManager = mContext.getSystemService(StorageManager.class);            mVolumeId = volume.getId();            mDescription = mStorageManager.getBestVolumeDescription(volume);        }        @Override        protected Exception doInBackground(Void... params) {            try {                mStorageManager.unmount(mVolumeId);                return null;            } catch (Exception e) {                return e;            }        }        @Override        protected void onPostExecute(Exception e) {        }    }
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