Uri file android target >= api 24

file_provider_paths.xml

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

manifest.xml

<!-- FILE PROVIDER PATHS -->
<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.mypackage.mobile.file_provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_provider_paths" />
</provider>

test.java

  if(file!=null)
  {
      Intent intent = new Intent();
      intent.setAction(Intent.ACTION_VIEW);

      Uri fileUri = FileProvider.getUriForFile(getActivity(), getActivity().getApplicationContext().getPackageName() + ".file_provider", file);

      intent.setDataAndType( fileUri, "image/*");
      intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
      startActivity(intent);
  }