question: public void init ( ) { if ( mContext == null ) { return ; } if ( mName . isEmpty ( ) ) { mName = mContext . getPackageName ( ) ; } if ( mMode == INVALID_VALUE || ( mMode != MODE_PRIVATE && mMode != MODE_WORLD_READABLE && mMode != MODE_WORLD_WRITEABLE ) ) { mMode = MODE_PRIVATE ; } mSharedPreferences = mContext . getSharedPreferences ( mName , mMode ) ; }
target:  Initial the instance of the preferences manager.