新建SQLite数据库的代码

好的，下面是在Eclipse中新建SQLite数据库的代码示例：

1. 在"MyDatabaseHelper.java"中定义数据库的名称、版本号、表名以及列名等信息：

public class MyDatabaseHelper extends SQLiteOpenHelper {
    private static final String DB_NAME = "mydatabase.db"; // 数据库名称
    private static final int DB_VERSION = 1; // 数据库版本号
    private static final String TABLE_NAME = "mytable"; // 表名
    private static final String COLUMN_ID = "_id"; // 列名1
    private static final String COLUMN_NAME = "name"; // 列名2
    private static final String COLUMN_AGE = "age"; // 列名3

    public MyDatabaseHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableSql = "CREATE TABLE " + TABLE_NAME + " (" +
            COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COLUMN_NAME + " VARCHAR(20), " +
            COLUMN_AGE + " INTEGER)";
        db.execSQL(createTableSql);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String dropTableSql = "DROP TABLE IF EXISTS " + TABLE_NAME;
        db.execSQL(dropTableSql);
        onCreate(db);
    }
}

2. 在MainActivity中实例化"MyDatabaseHelper.java"，并调用getWritableDatabase()方法获取可写数据库对象，用于进行增删改查操作：

public class MainActivity extends AppCompatActivity {
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        MyDatabaseHelper dbHelper = new MyDatabaseHelper(this);
        database = dbHelper.getWritableDatabase();
    }
}

3. 将数据库文件从assets文件夹中复制到应用程序的data/data/package_name/databases目录下，以便应用程序能够访问该数据库文件：

private void copyDatabase() throws IOException {
    InputStream inputStream = getAssets().open("mydatabase.db");
    String outFileName = getDatabasePath(DB_NAME).getPath();
    OutputStream outputStream = new FileOutputStream(outFileName);

    byte[] buffer = new byte[1024];
    int length;
    while ((length = inputStream.read(buffer)) > 0) {
        outputStream.write(buffer, 0, length);
    }

    outputStream.flush();
    outputStream.close();
    inputStream.close();
}

以上是在Eclipse中新建SQLite数据库的代码示例，希望对您有所帮助。