CP470 UPDATED Actual Exam Questions and CORRECT Answers
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Course
CP470
Institution
CP470
CP470 UPDATED Actual Exam Questions
and CORRECT Answers
What are parcelables? - CORRECT ANSWER- -Uses putExtra with parcelable as the
object
-Class has to implement parcelable
What two methods do you need for Parcelables? - CORRECT ANSWER-
describeContents() and WriteToParcel() - called whe...
CP470 UPDATED Actual Exam Questions
and CORRECT Answers
What are parcelables? - CORRECT ANSWER- ✔✔-Uses putExtra with parcelable as the
object
-Class has to implement parcelable
What two methods do you need for Parcelables? - CORRECT ANSWER-
✔✔describeContents() and WriteToParcel() - called when startActivity is executed, takes
parcel as input parameter
How do you retrieve a Parcelable from another activity? - CORRECT ANSWER-
✔✔getParcelableExtra()
How can you store files? - CORRECT ANSWER- ✔✔-SharedPreferences
-Internal/External
-SQL Databases
-Content Providers
External Storage - CORRECT ANSWER- ✔✔-could be SD Card
-World-readable
-Permissions set on AM
Internal Storage - CORRECT ANSWER- ✔✔-Always available
-Device's file system
-Only app can access files
-System removes all upon uninstall
-getFilesDir() for permanent
-getCacheDir() for temporary
SQLite DB - CORRECT ANSWER- ✔✔A - all or no mods performed
, C - when transaction has completed, all data is in consistent state
I - mods made by concurrent transactions must be isolated
D - effects are permanent
SQLiteOpenHelper - CORRECT ANSWER- ✔✔-Used for creating and opening DB
-Need to override constructor, onCreate, onUpgrade
-SQLiteOpenHelper(context, dbName, null, version)
How do you create an SQL DB? - CORRECT ANSWER- ✔✔Must call super
super(context, DB_NAME, NULL, VER)
SQLiteDB - onCreate - CORRECT ANSWER- ✔✔-if DB doesn't exist, this will be called
-Creating tables should occur here
-execSQL used to execute SQL statements
SQLiteDB - onUpgrade() - CORRECT ANSWER- ✔✔-if DB exists but ver number is newer,
then this is called
-used to drop tables, add tables, do anything else to update new schema
How do you open a read/write database? - CORRECT ANSWER- ✔✔Database =
dbHelper.getWritableDatabase()
Content values - CORRECT ANSWER- ✔✔-Class used for inserting rows into DB
-put(columnName, value)
rawQuery - CORRECT ANSWER- ✔✔-allows for arguments in queries
Cursor - CORRECT ANSWER- ✔✔-queries always return a cursor object
-storage object that contains rows from a query
-pointer to table rows
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