Android SQLite数据库存储，怎样创建一个的数据库？

Question

今天看《第一行代码--Android》,有一个地方没看懂，创建一个名为bookstore.db的数据库，
这个数据库在哪里创建，也就是创建数据库的代码在哪里写？

Answer 1

SQLiteOpenHelper类的构造方法中传入db名称自然就会创建数据库了，然后在SQLiteOpenHelper.onCreate()方法里创建表。

 // A string that defines the SQL statement for creating a table
private static final String SQL_CREATE_MAIN = "CREATE TABLE " +
    "main " +                       // Table's name
    "(" +                           // The columns in the table
    " _ID INTEGER PRIMARY KEY, " +
    " WORD TEXT"
    " FREQUENCY INTEGER " +
    " LOCALE TEXT )";
...
/**
 * Helper class that actually creates and manages the provider's underlying data repository.
 */
protected static final class MainDatabaseHelper extends SQLiteOpenHelper {

    /*
     * Instantiates an open helper for the provider's SQLite data repository
     * Do not do database creation and upgrade here.
     */
    MainDatabaseHelper(Context context) {
        super(context, DBNAME, null, 1);
    }

    /*
     * Creates the data repository. This is called when the provider attempts to open the
     * repository and SQLite reports that it doesn't exist.
     */
    public void onCreate(SQLiteDatabase db) {

        // Creates the main table
        db.execSQL(SQL_CREATE_MAIN);
    }
}

更详细的可以查看google developer官方说明：http://developer.android.com/guide/topics/providers/content-provider-creating.html