Swipe to refresh

[smichel17]

• Remove 'sync' from main menu
• Add pull down to sync
• Show spinner animation when background sync is happening
  • Replaces deprecated indeterminateProgressBar that's currently in use

Bad quality from webm -> gif conversion

[smichel17]

This doesn't seem difficult. I'll look in to it.

[smichel17]

It's really easy. See https://developer.android.com/training/swipe/index.html

Summary:

• Wrap the recyclerview in an <android.support.v4.widget.SwipeRefreshLayout
• Add this:

mySwipeRefreshLayout.setOnRefreshListener(
    new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            Log.i(LOG_TAG, "onRefresh called from SwipeRefreshLayout");

            // This method performs the actual data-refresh operation.
            // The method calls setRefreshing(false) when it's finished.
            myUpdateOperation();
        }
    }
);

• Add setRefreshing(false) to the end of the dropbox sync function.
• Done

I'm not going to implement it right now, but only because it's a dropbox-only feature, so I want to implement #590 first so we don't need to duplicate xml.