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Permissions

If you want to read a document from the gallery, you need to make sure that your application has permission to read from external storage. You can check it using the following code:

// checking for image browsing permissions
if (ContextCompat.checkSelfPermission(MainActivity.this,
    Manifest.permission.READ_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED) {

    ActivityCompat.requestPermissions(MainActivity.this,
        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
        PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
} else {
    // start image browsing
    createImageBrowsingRequest();
}

// checking for image browsing permissions
if (ContextCompat.checkSelfPermission(this@MainActivity,
    Manifest.permission.READ_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED) {

    ActivityCompat.requestPermissions(this@MainActivity,
        arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE),
        PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE
} else {
    // start image browsing
    createImageBrowsingRequest()
}

In order to use NFC, you should include the following permission to the Android Manifest:

android.permission.NFC