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- Question: Why saving a file to Android “External Storage” sometimes saves it to the “Internal Storage”, sometimes to the “SD Card”, and sometimes not at all?
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Why saving a file to Android “External Storage” sometimes saves it to the “Internal Storage”, sometimes to the “SD Card”, and sometimes not at all?
Saving a file to Android’s “External Storage” can sometimes be confusing because the term “External Storage” can refer to different locations depending on the device and its configuration.
In general, Android devices have two types of external storage: “primary external storage” and “secondary external storage”. The primary external storage is typically the built-in storage that is non-removable, while the secondary external storage is typically a removable SD card.
When you request access to the “External Storage” in your app, Android will determine the appropriate storage location based on the device and its configuration. If the device has a removable SD card, Android will prefer to use it as the “External Storage” if it is available and writable. If there is no SD card available, Android will use the built-in storage as the “External Storage”.
Sometimes, however, your app may not have permission to write to the “External Storage” due to changes in Android’s permissions model. Starting from Android 10, you need to request a special permission to access the “External Storage”, and even then, you may not be able to access certain directories such as the root directory.
To ensure that your app can save files to a consistent location, you should use the appropriate APIs to determine the actual storage location and request permission to write to it. For example, you can use the getExternalStorageState() method to determine the state of the external storage (whether it is mounted or not) and the getExternalFilesDir() method to get the path to the directory where your app can save its files.
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Bài 11 Save To Internal Storage
What is internal and external storage in Android?
In Android, internal and external storage refer to the two types of storage that are available for storing data on an Android device.
Internal storage refers to the built-in storage space on the device that is used to store system data, apps, and user data. This storage is not accessible to other devices and can only be accessed by the device itself. Typically, internal storage is not removable and has limited capacity, ranging from a few gigabytes to several hundred gigabytes depending on the device.
External storage, on the other hand, refers to storage that is external to the device itself, such as a microSD card or a USB flash drive. External storage can be added or removed from the device as needed and can be used to store user data, such as photos, videos, and music. External storage can also be used to store app data, but not all apps support this feature.
It’s important to note that in some newer Android devices, external storage may not be available or may be limited due to security concerns or hardware limitations. Additionally, some apps may not be able to access external storage due to permission restrictions.
What is the permission you need to declare when writing files to external storage?
When writing files to external storage on an Android device, you need to declare the “WRITE_EXTERNAL_STORAGE” permission in your app’s manifest file.
This permission allows your app to write to shared external storage, which includes the device’s SD card, and enables your app to share files with other apps that have the same permission. Without this permission, your app will not be able to write to external storage and may encounter errors when attempting to save files.
It’s important to note that starting from Android 11, the WRITE_EXTERNAL_STORAGE permission has become more restricted, and apps may not be able to access shared external storage by default. Instead, apps should use the Storage Access Framework to request access to specific directories and files on external storage.
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