Android设备挂载的所有存储器 手机存储 ，sd卡

获取Android设备挂载的所有存储器

android系统提供了Environment.getExternalStorageDirectory()接口获得存储器的路径，但是这个接口往往给的结果并不是我们想要的，在某些设备上它返回的是手机内部存储，某些设备它返回的手机外部存储。还有就是某些Android设备支持扩展多个sdcard，这个时候想要获得所有存储器的挂载路径，这个接口是没有办法办到的。

怎么获取Android设备所有存储器的位置呢？或者说获得所有的挂载点系统提供了一个StorageManager，它有一个方法叫getVolumeList，这个方法的返回值是一个StorageVolume数组，StorageVolume类中封装了挂载路径，挂载状态，以及是否可以移除等等信息。但是很可惜，这个方法是隐藏的api，所以我们只能通过反射来调用这个方法了，下面是这个方法。

只返回手机存储目录调用这个方法 实测可用

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();
//不可删除的并且挂载的是手机存储
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 ;

}

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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;        }    }

通过反射，获取到Android设备所有存储器。

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publicclassStorageInfo{ publicStringpath; publicStringstate; publicbooleanisRemoveable;   publicStorageInfo(Stringpath){ this.path=path; }   publicbooleanisMounted(){ return"mounted".equals(state); } }

public static List<StorageInfo> listAvaliableStorage(Context context) {
ArrayList<StorageInfo> storagges = new ArrayList<StorageInfo>();
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;
}

如何判断存储器是内置存储还是外置存储呢？StorageVolume这个类中提供了一个isRemovable()接口，通过反射调用它就可以知道存储器是否可以移除。把可以移除的存储器认定为外置sdcard，不可移除的存储器认定为内置存储器。

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

如何判断存储器的挂载状态呢？同上面一样，需要反射系统接口才可以获取到挂载状态。下面是代码片段

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

总结通过反射系统的StorageManager以及StorageVolume类提供的接口，就可以拿到Android设备挂载的所有存储器路径，以及存储器类型（内置存储还是外置存储），还有存储器的挂载状态等信息。