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Hema Explorer [Android] - Storing maps on an SD card

Author: Robert Taylor Reference Number: AA-00330 Views: 13685 Created: 2014-04-28 20:37 Last Updated: 2017-03-03 11:41 69 Rating/ 4 Voters

NOTE!

This article assumes that you already have the Hema Explorer app installed on your device.

Some devices will support 64Gb and 128Gb SD cards, and some will not. It would be wise to check that your device is compatible with large SD cards before making your purchase!

On some devices and/or versions of Android, the app will not be able to see the external storage path to be able to use it. Some device vendors do not configure their device correctly, causing the device to not present external storage in the standard way to apps.

WARNING for devices running Android 4.4 or higher

Google changed the way SD cards are accessed when they released version 4.4 of the Android operating system. The app was modified starting at version 1.5 to cater for these changes. However, Google continues to modify the security surrounding SD Card storage with updates to Android.

If you are running the Hema Explorer app on an Android device which has an SD card slot, and you have an SD card in the slot, you can store the offline maps on the SD card to reduce the space used on the device's internal storage memory.

If you are going to the trouble and expense of getting an SD card, we would generally recommend one of 8Gb in size or larger.

When this article was written the current "sweet spot" (ie. best bang for buck), was a 16Gb card.

If you are going to use an SD card for storage, it is easier to set up the app BEFORE you download any maps.

Configuring the app to use the SD card for storage

Go to the Settings panel

Scroll down until you see the Root Folder setting, and tap the option.

You will see a popup with some options. The options you see will depend on the version of Android which is on your device.

Android version older than 4.4

Root folder setting

If you wish to use an SD card for storage and your device is running an Android version earlier than 4.4, you should use the Choose custom location option.

Point the selector at the top-level of the SD card.

NOTE

You will need to browse the folder structure on your device to find the path to the external  SD card storage.

Different manufacturers do this in different ways, and the same device's path may change when the Android version is updated, so it is not possible for us to tell you exactly what the external SD card storage path will be on your specific device.

Newer versions of Android on Samsung devices, for example, often show paths such as /storage/3631-3532/.

If you are not sure for your device, try searching Google, you may find what you need to know there!

Hema Explorer will create its own folder on the SD card. Do NOT create your own folder!

Android version 4.4 or newer


If you wish to use an SD card for storage and your device is running an Android version later than 4.4, the possible paths for external storage should be displayed here. Different devices may expose different locations for their external storage. In some cases, a device may not provide the app with a storage location which the app understands, in which case the external storage path may not appear on the Root Folder dialog window. In this case, create a ticket in the Hema Support system, and advise the storage path which is not working in the ticket details, along with details of your device etc.

The app will create its own folder on the SD card. Do NOT create your own folder!

Note

You will only be able to use the Choose custom location option on devices running Android versions of 4.3 or lower.

Moving existing content

If you have already downloaded maps to the internal storage on your device, and you use an option to move the content to the external SD card storage, you should see a dialog telling you that the app is moving the existing data, as shown in the example below:

Moving file cache message

If you have already downloaded ALL map content, expect this move operation to take a while, as it there is around 2.5Gb of data being moved from your device's internal storage to the SD card. This takes time!

If the move of existing maps does not work on your device, try uninstalling and re-installing the app.


Not all Android devices have an SD card slot!

It can be an advantage if your device has an SD card slot as it allows you to extend your storage capacity (in a similar way to adding an extra hard drive to your PC).

On a device which has an SD card slot, the internal storage is often referred to as the "internal SD card" even though, technically, it is NOT an SD card.

Generally, we refer to a physical SD card as an "external" SD card to differentiate it from the internal storage.

NOTE

You will need to browse the folder structure on your device to find the path to the external  SD card storage.

Different manufacturers do this in different ways, and the same device's path may change when the Android version is updated, so it is not possible for us to tell you exactly what the external SD card storage path will be on your specific device.

If you are not sure for your device, try searching Google, you may find what you need to know there! 

The table below shows a few examples of how the path to the external SD card is defined on different devices and versions of Android (we'll add more examples as we come across them):

DeviceAndroid Version
SD Card Storage Path
 Acer Iconia
4.4.4
/storage/sdcard1
 Samsung Galaxy S2
4.0.4
/sdcard/external_sd
   
 Samsung Galaxy S3
4.4.4
/extSdCard
 Samsung Galaxy S3
4.3/storage/extSdCard/
 LG G3 phone
5.0
/storage/external_SD
   
   
   

WARNING!

Do NOT create a folder on the SD card, and point the app at the folder.

If you wish to use the SD card to store the Map content used by the Hema Explorer app, you simply point the Root Folder setting to the top-level of the external SD card.

When you point the app at the top level of the SD card, the app will create its own folder, which contains app content and other sub-folders.

If you have issues accessing the SD card storage on your device, make sure the card is inserted correctly in the device slot. Try ejecting and re-inserting the card in the slot.

The following link will take you to the online user guide for info on changing the app settings to use the SD card for storage:

http://help.hema-labs.com/Android/webhelp/


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