CP470 Exam Questions With 100% Correct
Answers
What are parcelables? - answer-Uses putExtra with parcelable as the object
-Class has to implement parcelable
What two methods do you need for Parcelables? - answerdescribeContents() and
WriteToParcel() - called when startActivity is executed, tak...
What are parcelables? - answer✔-Uses putExtra with parcelable as the object
-Class has to implement parcelable
What two methods do you need for Parcelables? - answer✔describeContents() and
WriteToParcel() - called when startActivity is executed, takes parcel as input parameter
How do you retrieve a Parcelable from another activity? - answer✔getParcelableExtra()
How can you store files? - answer✔-SharedPreferences
-Internal/External
-SQL Databases
-Content Providers
External Storage - answer✔-could be SD Card
-World-readable
-Permissions set on AM
Internal Storage - answer✔-Always available
-Device's file system
-Only app can access files
-System removes all upon uninstall
-getFilesDir() for permanent
-getCacheDir() for temporary
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 - 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? - answer✔Must call super
super(context, DB_NAME, NULL, VER)
SQLiteDB - onCreate - answer✔-if DB doesn't exist, this will be called
-Creating tables should occur here
-execSQL used to execute SQL statements
SQLiteDB - onUpgrade() - 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? - answer✔Database = dbHelper.getWritableDatabase()
Content values - answer✔-Class used for inserting rows into DB
-put(columnName, value)
rawQuery - answer✔-allows for arguments in queries
Cursor - answer✔-queries always return a cursor object
-storage object that contains rows from a query
-pointer to table rows
-getCount - num rows
-moveToFirst, moveToNext
-getXXX for column data
-getColumnIndex(name) with matching name
-isAfterLast() - if cursor after last row
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