獲取Android設備掛載的所有存儲器

android系統提供了Environment.getExternalStorageDirectory()接口獲得存儲器的路徑，但是這個接口往往給的結果並不是我們想要的，在某些設備上它返回的是手機內部存儲，某些設備它返回的手機外部存儲。還有就是某些Android設備支持擴展多個sdcard，這個時候想要獲得所有存儲器的掛載路徑，這個接口是沒有辦法辦到的。

• 怎麼獲取Android設備所有存儲器的位置呢？或者說獲得所有的掛載點系統提供了一個StorageManager，它有一個方法叫getVolumeList，這個方法的返回值是一個StorageVolume數組，StorageVolume類中封裝了掛載路徑，掛載狀態，以及是否可以移除等等信息。但是很可惜，這個方法是隱藏的api，所以我們只能通過反射來調用這個方法了，下面是這個方法。

   

  只返回手機存儲目錄調用這個方法 實測可用
  

  public File getStorage(){
  		StorageManager manager =(StorageManager) getSystemService(STORAGE_SERVICE);
  		try {
  		Class[] paramClasses = {};
             Method getVolumeList;
  	
  			getVolumeList = StorageManager.class.getMethod("getVolumeList", paramClasses);
  			  getVolumeList.setAccessible(true);
  			  Object[] params = {};
  			  Object[] invokes = (Object[]) getVolumeList.invoke(manager, params);
  			  if (invokes != null) {
  				  for (int i = 0; i < invokes.length; i++) {
  	                    Object obj = invokes[i];
  	                    Method getPath = obj.getClass().getMethod("getPath", new Class[0]);
  	                    String path = (String) getPath.invoke(obj, new Object[0]);
  	                    File file = new File(path);
  	                    if ((file.exists()) && (file.isDirectory()) && (file.canWrite())) {
  	                        Method isRemovable = obj.getClass().getMethod("isRemovable", new Class[0]);
  	                        String state = null;
  	                        try {
  	                            Method getVolumeState = StorageManager.class.getMethod("getVolumeState", String.class);
  	                            state = (String) getVolumeState.invoke(manager, path);
  	                          
  	                        } catch (Exception e) {
  	                            e.printStackTrace();
  	                        }
  	                    boolean canRemovable =    ((Boolean) isRemovable.invoke(obj, new Object[0])).booleanValue();
  	                    //不可刪除的並且掛載的是手機存儲
  	                    if (!canRemovable&&state.equals(Environment.MEDIA_MOUNTED)) {
  							return file ;
  						}
  	                   
  	                    }
  	                  
  				  }  
  			  }
  		} catch (NoSuchMethodException e) {
  			// TODO Auto-generated catch block
  			e.printStackTrace();
  		} catch (IllegalAccessException e) {
  			// TODO Auto-generated catch block
  			e.printStackTrace();
  		} catch (IllegalArgumentException e) {
  			// TODO Auto-generated catch block
  			e.printStackTrace();
  		} catch (InvocationTargetException e) {
  			// TODO Auto-generated catch block
  			e.printStackTrace();
  		}
  		return null ;
           
  	}

  
  
  
  12345678910111213141516 public StorageVolume[] getVolumeList() { if (mMountService == null) return new StorageVolume[0]; try { Parcelable[] list = mMountService.getVolumeList(); if (list == null) return new StorageVolume[0]; int length = list.length; StorageVolume[] result = new StorageVolume[length]; for (int i = 0; i < length; i++) { result[i] = (StorageVolume)list[i]; } return result; } catch (RemoteException e) { Log.e(TAG, "Failed to get volume list", e); return null; } }

   

• 通過反射，獲取到Android設備所有存儲器。
• 
  

   

  1 2 3 4 5 6 7 8 9 10 11 12 13 publicclassStorageInfo{ publicStringpath; publicStringstate; publicbooleanisRemoveable; publicStorageInfo(Stringpath){ this.path=path; } publicbooleanisMounted(){ return"mounted".equals(state); } }
  

   

• public static List listAvaliableStorage(Context context) {
          ArrayList storagges = new ArrayList();
          StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
          try {
              Class[] paramClasses = {};
              Method getVolumeList = StorageManager.class.getMethod("getVolumeList", paramClasses);
              getVolumeList.setAccessible(true);
              Object[] params = {};
              Object[] invokes = (Object[]) getVolumeList.invoke(storageManager, params);
              if (invokes != null) {
                  StorageInfo info = null;
                  for (int i = 0; i < invokes.length; i++) {
                      Object obj = invokes[i];
                      Method getPath = obj.getClass().getMethod("getPath", new Class[0]);
                      String path = (String) getPath.invoke(obj, new Object[0]);
                      info = new StorageInfo(path);
                      File file = new File(info.path);
                      if ((file.exists()) && (file.isDirectory()) && (file.canWrite())) {
                          Method isRemovable = obj.getClass().getMethod("isRemovable", new Class[0]);
                          String state = null;
                          try {
                              Method getVolumeState = StorageManager.class.getMethod("getVolumeState", String.class);
                              state = (String) getVolumeState.invoke(storageManager, info.path);
                              info.state = state;
                          } catch (Exception e) {
                              e.printStackTrace();
                          }
  
  
                          if (info.isMounted()) {
                              info.isRemoveable = ((Boolean) isRemovable.invoke(obj, new Object[0])).booleanValue();
                              storagges.add(info);
                          }
                      }
                  }
              }
          } catch (NoSuchMethodException e1) {
              e1.printStackTrace();
          } catch (IllegalArgumentException e) {
              e.printStackTrace();
          } catch (IllegalAccessException e) {
              e.printStackTrace();
          } catch (InvocationTargetException e) {
              e.printStackTrace();
          }
          storagges.trimToSize();
  
  
          return storagges;
      }

  
  
  
   
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• 如何判斷存儲器是內置存儲還是外置存儲呢？StorageVolume這個類中提供了一個isRemovable()接口，通過反射調用它就可以知道存儲器是否可以移除。把可以移除的存儲器認定為外置sdcard，不可移除的存儲器認定為內置存儲器。

   

  1 MethodisRemovable=obj.getClass().getMethod("isRemovable",newClass[0]);

   

   

• 如何判斷存儲器的掛載狀態呢？同上面一樣，需要反射系統接口才可以獲取到掛載狀態。下面是代碼片段

   

  1 2 3 MethodgetVolumeState=StorageManager.class.getMethod("getVolumeState",String.class); state=(String)getVolumeState.invoke(storageManager,info.path); info.state=state;

   

• 總結通過反射系統的StorageManager以及StorageVolume類提供的接口，就可以拿到Android設備掛載的所有存儲器路徑，以及存儲器類型（內置存儲還是外置存儲），還有存儲器的掛載狀態等信息。
•