Download Android Database Programming by Jason Wei PDF

By Jason Wei

Make the most the ability of data-centric and data-driven Android functions with this functional educational grasp the talents to construct data-centric Android purposes transcend simply code via hard your self to consider functional use-cases with SQLite and others specialise in flushing out excessive point layout thoughts, ahead of drilling down into assorted code examples intimately we are living in an more and more data-centric and data-driven global. On most sensible of that we are living in a really mobile-centric global with the increase of Android clever telephones and capsule units and the surge widespread for the Android platform. in addition to the call for for extra info, there's a call for for effective, "snappy" purposes, and so builders must have a powerful figuring out of whilst diverse info garage tools are acceptable and after they aren't. studying how one can use those fields to effectively create a strong software may help you strengthen your wisdom and talents during this region. "Android Database Programming" is designed to aid builders create and layout data-centric cellular purposes on Google's Android platform. because the international is going more and more cellular and as consumers' call for for data-centric purposes rises, figuring out find out how to mix the 2 successfully turns into an more and more vital asset to have as a developer. The ebook begins by way of taking a look at a number of the neighborhood info garage equipment on Android, and finishes off through analyzing exterior databases and methods you could make the most of them from inside an Android software. This ebook begins by way of neighborhood information garage equipment, concentrating on writing SQLite databases to your software and in addition how one can bind those databases to the person interface. The ebook, via its functional technique, strives to educate you by way of examples. each one bankruptcy makes a speciality of flushing out excessive point layout options, earlier than drilling down into assorted code examples.

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And now that we have a solid foundation in developing custom SQLite databases for Android, it's time to put the icing on the cake. Though in theory, we could have one universal get() query which returns to us all columns of every row in our database as a Cursor object, and then filter and manipulate each row for our desired data – we can do better. Don't get me wrong – Java is fast – but when it comes to dealing with potentially thousands of rows of data on relatively limited memory, why not optimize things and let SQL do what it does best – that is, query for things!

The adb shell is a versatile command-line interface that allows you to communicate with a running emulator or a connected Android device. html for more details). In order to use adb, simply open your terminal and navigate to //platform-tools/ and type the following command: adb shell or type the following command if you want to target a specific emulator to connect to: adb –s emulator-xxxx shell At this point, you should have started the adb tool, at which point you need to tell it to connect to the emulator's sqlite3 database.

Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { ... STUDENT_ID, cv); return (result >= 0); } } Now we have three simple wrapper methods for adding data into our schema. The first two involve adding new students and new courses into the database and the last one involves adding a new mapping between a student (represented by his/her ID) and a course (essentially, we are enrolling a student into a course through this mapping). Notice that in each wrapper method, we're simply adding the values into a ContentValue object, retrieving the writeable SQLite database, and then inserting this ContentValue as a new row into the specified table.

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