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13 Application Context

http://stackoverflow.com/a/3572553/3708094

Uitleg:

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).

Use cases

  • 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, ...);