I finally found good example code on how to create ContentProviders and FileProviders on https://github.com/commonsguy/cw-omnibus/tree/master/ContentProvider
The actual error in my code was that in the Manifest file I had the provider
tag outside of the application
tag, but it must be inside.
The Manifest must look like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.company.app">
<uses-sdk android:minSdkVersion="13" />
<permission
android:name="com.company.app.fileprovider.READ"
android:description="@string/perm_read"
android:label="@string/perm_read_label"/>
<uses-permission android:name="com.company.app.fileprovider.READ"/>
<application android:label="MyApp">
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.company.app.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
android:readPermission="com.company.app.fileprovider.READ">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>