1.public abstract Context getApplicationContext ()Return the context of the single, global Application object of the current process.2.public abstract ApplicationInfo getApplicationInfo ()Return the full application info for this context's package.3.public abstract ContentResolver getContentResolver ()Return a ContentResolver instance for your application's package.4.public abstract PackageManager getPackageManager ()Return PackageManager instance to find global package information.5.public abstract String getPackageName ()Return the name of this application's package.6.public abstract Resources getResources ()Return a Resources instance for your application's package.7.public abstract SharedPreferences getSharedPreferences (String name, int mode)Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values. Only one instance of the SharedPreferences object is returned to any callers for the same name, meaning they will see each other's edits as soon as they are made.8.public final String getString (int resId)Return a localized string from the application's package's default string table.9.public abstract Object getSystemService (String name)Return the handle to a system-level service by name. The class of the returned object varies by the requested name. Currently available names are: