wesley tanaka

Tech

What is Gradle? (comparison of gradle vs ant vs make)

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Gradle is a build tool similar to make or ant which is being adopted by the Android project as a replacement for ant scripts and the automated "build" step in Eclipse.

There's a useful book about Gradle available online for free at http://www.gradleware.com/registered/books/building-and-testing/

Here is a comparison between gradle and two other commonly used build tools:

Android SQLiteOpenHelper onUpgrade()

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It's not necessary to wrap your SQLiteOpenHelper.onUpgrade() code in beginTransaction() and endTransaction() pairs, because ever since the earliest version of SQLiteOpenHelper, the Android source code has done this for you:

Query the COUNT of rows in a SQLite table in Android

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There's a function DatabaseUtils.queryNumEntries() which can be used to query SELECT COUNT(*) FROM table; in a SQLite database in Android.

java.lang.VerifyError: com.google.analytics.tracking.android.AppFieldsDefaultProvider

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The Google Analytics SDK for Android v3 (Beta) does not support Android 1.5 (API version 3).  When you try to call EasyTracker.getInstance(this).activityStart(this); you will get this error:

java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable

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"java.lang.IllegalStateException: attempt to acquire a reference on a close SQLiteClosable" can occur in an Android program if you try to do an operation (like run a .query()) on a SQLiteDatabase object which has already been

Regression testing sqlite database migrations in Android

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One strategy to test Android sqlite database upgrades is to make a copy of your SQLiteOpenHelper class each time you create a new database version. That way, you can use the older revisions of SQLiteOpenHelper to create legacy versions of your database schema and make sure that when you open the database with newer versions, the upgrade works properly.

3D models from a single photo

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Drop, modify, change or rename a column from a SQLite table in Android

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SQLite only supports a limited subset of ALTER TABLE, so to modify an existing column, it's necessary to create a separate table. The SQLite documentation recommends doing two separate INSERT/SELECT operations using a temporary table, instead of doing an INSERT/SELECT followed by an ALTER TABLE RENAME TO.

Running a SQLite database transaction in Android

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The idiom for SQLite transactions in Android is:

db.beginTransaction();
try {
  // Do database operations here ...
  db.setTransactionSuccessful();
} finally {
  db.endTransaction();
}

Responsive AdSense Leaderboard ad unit for Twitter Bootstrap 2.3.2

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Twitter Bootstrap 2.3.2 sets its media query responsive layout breaks at 768px, 980px, (and 1200px), which are suitable for including a Mobile Banner (320 x 50), Leaderboard (728 x 90), or a  Large Leaderboard (970 x 90). It's possible to do this with the new beta Responsive ad unit AdSense ad size.

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by Wesley Tanaka