What is Context in Android?

As the name suggests, its the context of current state of the application/object. It lets newly created objects understand what has been going on. Typically you call it to get information regarding another part of your program (activity, package/application)
You can get the context by invoking getApplicationContext()getContext()getBaseContext() or this (when in the activity class).
Typical uses of context:
  • Creating New objects: Creating new views, adapters, listeners:
    TextView tv = new TextView(getContext());
    ListAdapter adapter = new SimpleCursorAdapter(getApplicationContext(), ...);
  • Accessing Standard Common Resources: Services like LAYOUT_INFLATER_SERVICE, SharedPreferences:
    context.getSystemService(LAYOUT_INFLATER_SERVICE)   
    getApplicationContext().getSharedPreferences(*name*, *mode*);
  • Accessing Components Implicitly: Regarding content providers, broadcasts, intent
    getApplicationContext().getContentResolver().query(uri, ...);

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