android应用如何有效获取管理存储

注： 作者原创，转载请标明出处。

谷歌原生没有提供有效的获取内部存储、SD卡、OTG设备文件区分，那么，怎样有效获取？

一般情况：

1.   通过反射调用：

StorageManager.getVolumeList();

2. 通过调用得到StorageVolume 列表，但是我们不能有效的区分哪一个是sd,otg,内部存储，怎么办？

一般内部存储的文件path以"/storage/emulated"开头，通过该标志可判断内部存储

关于sd卡和otg怎么判断？

根据前面获取到的列表数据： 

DiskInfo di= mStorageManager.findVolumeByUuid(sv.getUuid()).getDisk();

di对象有isSd()、isUsb()方法，至此可以区分开来。

具体可参考如下：

package com.fileexplorer.service;import android.app.Service;import android.content.Intent;import android.os.Environment;import android.os.IBinder;import android.os.storage.StorageManager;import android.os.storage.StorageEventListener;import android.os.storage.StorageVolume;import android.os.storage.DiskInfo;import android.util.Log;import com.fileexplorer.service.FileManageService;import java.io.File;import java.util.ArrayList;import java.util.Collections;import java.util.List;/** * Created by Xuehao.Jiang on 2017/6/27. */public class FileManageService extends Service {    private static final String TAG = FileManageService.class.getSimpleName();    private StorageManager mStorageManager;    private StorageVolume[]  storageVolumes = null;    private static List storageVolumeAll = new ArrayList();    private List sListeners = new ArrayList();    private static  final int PHONE_ROOT = 0;    private static  final int SD_ROOT = 1;    private static  final int OTG_ROOT = 2;    private static  final int NONE_ROOT = -1;    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public void onCreate() {        super.onCreate();        Log.d(TAG,"  onCreate .... ");        mStorageManager = (StorageManager) getSystemService(STORAGE_SERVICE);        mStorageManager.registerListener(mStorageListener);        init();    }    @Override    public void onDestroy() {        super.onDestroy();        mStorageManager.unregisterListener(mStorageListener);        Log.d(TAG,"  onDestroy .... ");    }    private final StorageEventListener mStorageListener = new StorageEventListener() {        @Override        public void onStorageStateChanged(String path, String oldState, String newState) {            refresh();            notifyStorageChanged(path,oldState,newState);        }    };    public  void init(){        Log.d(TAG,"  init .... ");        refresh();    }    private void refresh(){        storageVolumeAll.clear();        storageVolumes = mStorageManager.getVolumeList();        if(storageVolumes != null && storageVolumes.length>0){            for(int i=0; i< storageVolumes.length ; i++){                StorageVolume sv = storageVolumes[i];                Log.d(TAG,"   ....storageVolumes[ "+i+"] = "+sv +" mfsUuid="+ sv.getUuid()+"  path="+ sv.getPath() +" label="+ sv.getDescription(this));                File f =sv.getPathFile();                if( f.exists()&& f.isDirectory() && f.canWrite()){                    if(Environment.MEDIA_MOUNTED.equals(sv.getState())){                        storageVolumeAll.add(sv);                    }                }            }            Log.d(TAG,"  storageVolumeAll  size="+ storageVolumeAll.size());        }    }    public static List getStorageVolumes(){        return storageVolumeAll;    }    public static int getRootPath(String path){        if(storageVolumeAll.size()>0){            for(StorageVolume sv: storageVolumeAll){                String mPath = sv.getPath();                if(path!=null && path.equals(mPath)){                    if(path.startsWith("/storage/emulated")){                        return PHONE_ROOT;                    }else {                        DiskInfo di= mStorageManager.findVolumeByUuid(sv.getUuid()).getDisk();                        if(di.isSd()){                            return SD_ROOT;                        }else if(di.isUsb()){                            return OTG_ROOT;                        }                    }                }            }        }        return NONE_ROOT;    }    public interface CallBackListener{        public void notifyStorageChanged(String path, String oldState, String newState);    }    private final Object sLock = new Object();    public void addCallBackListener(CallBackListener scl) {        synchronized (sLock) {            sListeners.add(scl);        }    }    public void removeCallBackListener(CallBackListener scl) {        synchronized (sLock) {            sListeners.remove(scl);        }    }    public void notifyStorageChanged(String path, String oldState, String newState) {        synchronized (sLock) {            for (CallBackListener l : sListeners) {                l.notifyStorageChanged(path, oldState, newState);            }        }    }}