StorageHelper

float getStorageFreeSize()

The remaining storage space inside the device.
return:
Size of remaining space, e.g. 16384

---

float getStorageTotalSize()

Total storage space inside the device.
return:
Total space size, e.g. 6114

---

void updateFile(String filePath)

Update storaged file.
parameter:
filePath: the path of file you need to update.

---

String getSDCardPath()

Get external SD card path. e.g., "storage/3263-3533".
return:
The path of the SD card.

---