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Android Build a Weather App (2015) Hooking Up the Model to the View Using Butter Knife for Views

Declaring Views

Instead of using Butter Knife for declaring the views, can't I just declare the views all on one line? Or is there some reason we instantiate them within the OnCreate method?

For example,

private TextView mTemperatureLabel = (TextView) findViewById(R.id.temperaturelabel);

1 Answer

OnCreate() is responsible to create views, bind data to lists, etc. This is where all the lifecycle of your app start, you could declare your TextView and also initiate it inside this method but doing that you are limiting this TextView just for this method (Local Scope), The reason to declare variables and views outside the Oncreate() is to make them accessible for the whole class (Global scope) and just after it you initiate them inside the method OnCreate that finally will create the views and etc.