Question

How do I open and write to a file in an Android class outside an activity?

FileWriter is my external class, initialized from MainActivity. The following line in FileWriter:

FileOutputStream fos = openFileOutput("filename", Context.MODE_PRIVATE);

Yields this compilation error:

The method openFileOutput(String, int) is undefined for the type FileWriter

I guess that the class requires some application context – how do I pass it?

Answer 1

Simply pass a Context object to the FileWriter class and change your call to this:

FileOutputStream fos = context.openFileOutput("filename", Context.MODE_PRIVATE);

Hope this helps.