android应用如何有效获取管理存储

#android应用如何有效获取管理存储| 来源: 网络整理| 查看: 265

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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); } } } }

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