How to Tell If the Sdcard Is Mounted in Android

How to tell if the sdcard is mounted in Android?

If you're trying to access images on the device, the best method is to use the MediaStore content provider. Accessing it as a content provider will allow you to query the images that are present, and map content:// URLs to filepaths on the device where appropriate.

If you still need to access the SD card, the Camera application includes an ImageUtils class that checks if the SD card is mounted as follows:

static public boolean hasStorage(boolean requireWriteAccess) {
    //TODO: After fix the bug,  add "if (VERBOSE)" before logging errors.
    String state = Environment.getExternalStorageState();
    Log.v(TAG, "storage state is " + state);

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        if (requireWriteAccess) {
            boolean writable = checkFsWritable();
            Log.v(TAG, "storage writable is " + writable);
            return writable;
        } else {
            return true;
        }
    } else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return true;
    }
    return false;
}

Check whether the SD card is available or not programmatically

Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
Boolean isSDSupportedDevice = Environment.isExternalStorageRemovable();

if(isSDSupportedDevice && isSDPresent)
{
  // yes SD-card is present
}
else
{
 // Sorry
}

Is there a way to tell if the sdcard is mounted vs not installed at all?

for example:

String state = Environment.getExternalStorageState();

if (state.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {

}

Check out the possible constants at : http://developer.android.com/reference/android/os/Environment.html#getExternalStorageState%28%29

How to check if SD card inserted in Android?

This question has several duplicates, however, you can check for the SD card like this:

Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);

A sure shot method to find if SDCard is present

You should use getExternalFilesDirs method. This method returns path(s) to both internal memory & Micro SD card (if present). The second returned path would be path of Micro SD card. But that path may not be root directory of Micro SD card.

getExternalFilesDirs introduced in API level 19 is the only official method that can be used to get SD card path. All others methods will return either public or private storage locations(paths) of internal memory.

I have tested this method on my phone & emulator. Kindly, note that I have passed null as parameter for getExternalFilesDirs during testing. But You could also pass parameter(s) like Environment.DIRECTORY_PICTURES, Environment.DIRECTORY_MOVIES etc.

TEST RESULTS:-

When my phone has memory card inserted, getExternalFilesDirs returned :

1st path (internal memory): /storage/emulated/0/Android/data/my_package.appname/files

2nd path (Micro SD): /storage/sdcard1/Android/data/my_package.appname/files

Note: root directory of my SD card is: /storage/sdcard1

On my emulator, getExternalFilesDirs returned :

1st path (internal memory): /storage/emulated/0/Android/data/my_package.appname/files

2nd path (Micro SD): /storage/11E9-4214/Android/data/my_package.appname/files

Note: On emulator, SD card is emulated(not real one).

If Micro SD card is ejected (either on phone or emulator) getExternalFilesDirs returns null

1st path (internal memory): path to internal memory - It varies depending on device

2nd path (Micro SD): null

BUT ;

On some devices, you may not get the Micro SD card path. It means getExternalFilesDirs will return only one path(internal memory). Second path would be empty i.e. it will not return any second path.

Reason: OEM of that particular device may not have set the path (i.e. SECONDARY_STORAGE environment variable) in the device.

This answer for this question says,

the OEM must have set the SECONDARY_STORAGE environment variable in
the device specific init.rc file as mentioned here:
https://source.android.com/devices/storage/config-example.html

Also the comment made by somesh on the above mentioned answer says,

If that environment variable is not set, you can't write to the sdcard
by making use of getExternalFilesDirs since its not going to return
the sdcard path.

In those kind of cases, assume that memory card is not present and save whatever you want to save in internal memory.

To Summarize, If getExternalFilesDirs doesn't return second path or returned second path is null, don't store in SD card (store in internal storage); else store in second path returned by getExternalFilesDirs

Suggestion:

To understand about different storage locations in Android, please go through my answer on stackoverflow

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