How can I use Android's FileProvider to obtain the URI for a file that is located on an external SD?

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To use Android's FileProvider to obtain the URI for a file that is located on an external SD, you will need to follow these steps:

1. Add the following code in your AndroidManifest.xml file inside the application tag:

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

1. Create a file_paths.xml file in your res/xml folder, and add the following code:

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_sd" path="."/>
</paths>

1. Use the following code to get the URI of the file:

File file = new File(Environment.getExternalStorageDirectory(), "fileName.jpg");
Uri fileUri = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", file);

Note: Replace "fileName.jpg" with the actual name of your file. Also, make sure that you have the necessary permissions to access external storage. You can use the new Storage Access Framework introduced in Android 4.4 KitKat to request permission to access external storage.