Select File from file manager via Intent

You can use this:

Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*"); 
startActivityForResult(intent, REQUEST_CODE);

For samsung devices to open file manager use this:

Intent intent = new Intent("com.sec.android.app.myfiles.PICK_DATA");
intent.putExtra("CONTENT_TYPE", "*/*");
intent.addCategory(Intent.CATEGORY_DEFAULT);

For more reference checkout http://developer.android.com/guide/topics/providers/document-provider.html

So for my Samsung device this worked:

Intent intent = new Intent("com.sec.android.app.myfiles.PICK_DATA");
intent.putExtra("CONTENT_TYPE", "*/*");
intent.addCategory(Intent.CATEGORY_DEFAULT);
startActivityForResult(intent, FILE_SELECT_CODE);