在android上刷新和SQLite数据库

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "my_database.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建数据库表
        db.execSQL("CREATE TABLE IF NOT EXISTS my_table (id INTEGER PRIMARY KEY, name TEXT)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 升级数据库
        db.execSQL("DROP TABLE IF EXISTS my_table");
        onCreate(db);
    }
}

public class MainActivity extends AppCompatActivity {
    private DatabaseHelper mDatabaseHelper;

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

        // 创建SQLiteOpenHelper实例
        mDatabaseHelper = new DatabaseHelper(this);

        // 刷新数据库
        refreshDatabase();
    }

    private void refreshDatabase() {
        // 获取可写的SQLite数据库实例
        SQLiteDatabase db = mDatabaseHelper.getWritableDatabase();

        // 删除旧数据
        db.delete("my_table", null, null);

        // 插入新数据
        ContentValues values = new ContentValues();
        values.put("name", "John Doe");
        db.insert("my_table", null, values);
    }
}