By Zigurd Mednieks, G. Blake Meike, Laird Dornin, Masumi Nakamura
What does it take to construct well-engineered Android purposes? discover Android's middle development blocks and APIs intensive with this authoritative advisor, and the right way to create compelling apps that paintings on an entire diversity of Android units. You'll paintings with confirmed ways to app layout and implementation—including software frameworks so that you can use as a kick off point to your personal projects.
Delve into sensors, local improvement, 3D portraits, and plenty of different issues, and notice the right way to construct apps at the platform of your selection. If you're an intermediate to complex programmer, you'll find out how to make nice Android apps.
• find out how to use the Android SDK with the Eclipse IDE
• follow complicated Java innovations despite your adventure with the language
• Create an Android person interface that's pleasing and simple to navigate
• Use the Fragment API for capsule consumer interfaces
• Make your program suitable with Honeycomb and past versions
• comprehend Android's specific database layout matters and the position of SQLite
• Use sensors and gestures to extend your app's enter past simply tapping and scrolling
• discover Android APIs for multimedia, position, communique, NFC, and different purposes
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Additional info for Programming Android
They both provide a transaction context, but the Required attribute will start a new transaction if one does not exist whereas the Mandatory attribute will not. Regardless of your transaction design strategy, the following best practice can help clarify when to use each attribute: Best Practice: If a method requires a transaction context but is not responsible for marking the transaction as rollback only, that method should have a transaction attribute of Mandatory The rationale for this best practice is based on transaction ownership.
This default attribute can be overridden using methodlevel assignment (we will see this later in the chapter). REQUIRED The Required attribute (PROPAGATION_REQUIRED in Spring) tells the container that a transaction is needed for the particular bean method. If there is an existing transaction context the container will use it; otherwise it will start a new transaction. This is the most common transaction attribute, and the one most developers will use for transaction processing. However, as we will see in the next section sometimes there are good reasons to use the Mandatory attribute instead.
95 54│JAVA TRANSACTION DESIGN STRATEGIES until it is committed. This is the default isolation setting for most databases and is supported by all database vendors. TransactionRepeatableRead Rather than interleaving the transactions, this isolation level setting keeps all transactions isolated from one another. This isolation level ensures that once a set of values is read from the database for a particular transaction, that same set of values will be read every time the select statement is executed (unless the transaction holding the read and write locks modifies the data).