Understanding Architecture of Nick Butcher's Plaid App - Part-1

This is the first post in the series which will address the architecture of the Plaid app.
The source code is available at : https://github.com/nickbutcher/plaid

 Checkout some screenshots here :

 

HomeActivity

This is the launcher activity.

Three important classes

• FilterAdapter -  Adapter for showing list of data sources in Drawer
• DataManager - Responsible for loading data from the various sources.Instantiating classes are responsible for Providing the {codeonDataLoaded} method to do something with the data.

• FeedAdapter - main adapter responsible for the feeding the data on home screen based on various source 

Lets look at what happens in OnCreate()

• Inflate the layout from R.layout.activity_home
• Buttterknife helps binding the indivisual views 
• // This snippet shows the system bars. It does this by removing all the flags
  // except for the ones that make the content appear under the system bars.
  private void showSystemUI() {
      drawer.setSystemUiVisibility(
              View.SYSTEM_UI_FLAG_LAYOUT_STABLE
              | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
              | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
  }
• Set toolbar:  Animate it if we are launching it for the first time
• Configuring the setOnApplywindowInsetsListener - Still trying out to figure this out :-(
• Set the icon using setTaskDescription ()
• Set the listener for filteradapter for filterchange and data source change
• Ask data manager to load data from all resources
• Check if the adapter is empty ? - 
   if feedadapter doent have any count then check
     // if grid is empty check whether we're loading or if no filters are selected , if filters selected then show progress bar  else if no filters selected then show that no filters are selected
• Check if there is network connectivity and appropriately show icons