生成下载pdf时出现android.os.FileUriExposedException错误

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

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="." />
</paths>

File file = new File(Environment.getExternalStorageDirectory(), "example.pdf");
Uri fileUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", file);

Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("application/pdf");
intent.putExtra(Intent.EXTRA_STREAM, fileUri);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(Intent.createChooser(intent, "Share PDF"));