Android 如何删除SQLite数据库？

我想从设备中删除SQLite数据库。我试图删除它，但它没有得到删除，因为我可以看到数据库的旧记录

尝试按如下方式删除：

        deleteDatabase(Constants.DATABASE_NAME);

            DatabaseHelper db = new DatabaseHelper(this);
            db.createDatabase();

常数：

    public class Constants {

    public static final int DATABASE_VERSION = 12;
    public static final String DATABASE_NAME = "contactsApp";
}

数据库助手：

public class DatabaseHelper extends SQLiteOpenHelper {

    private static final String USER_TABLE = "userTable";
    private static final String KEY_USER_NAME = "userName";
    private static final String KEY_EMAIL_ID = "emailId";
    private static final String KEY_MOBILE_NO = "mobileNo";
    private static final String KEY_PROFILE_IMAGE = "profileImage";
    private static final String KEY_FULL_NAME = "fullName";
    private static final String KEY_DEVICE_ID = "deviceId";
    private static final String KEY_PASSWORD ="password";
    private static final String KEY_USER_ID = "userId";
    private static final String KEY_JOB_TITLE = "jobTitle";
    private static final String KEY_WORK_ADDRESS = "workAddress";
    private static final String KEY_WORK_PHONE = "workPhone";
    private static final String KEY_HOME_ADDRESS = "homeAddress";


    private static final String CONTACT_TABLE = "contactTable";
    private static final String KEY_CONTACT_NAME = "contactName";
    private static final String KEY_CONTACT_EMAIL_ID = "contactEmailId";
    private static final String KEY_CONTACT_MOBILE_NO = "contactMobileNo";
    private static final String KEY_CONTACT_PROFILE_IMAGE = "contactProfileImage";
    private static final String KEY_CONTACT_ID = "contactId";
    private static final String KEY_CONTACT_FULL_NAME = "fullName";
    private static final String KEY_CONTACT_JOB_TITLE = "jobTitle";
    private static final String KEY_CONTACT_WORK_ADDRESS = "workAddress";
    private static final String KEY_CONTACT_WORK_PHONE = "workPhone";
    private static final String KEY_CONTACT_HOME_ADDRESS = "homeAddress";

    private Context context;

    public DatabaseHelper(Context context) {
        super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
        //3rd argument to be passed is CursorFactory instance
        this.context = context;
    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {

        createTable(db);

    }

    public void createDatabase(){
        context.deleteDatabase(Constants.DATABASE_NAME + ".db");
        SQLiteDatabase db = this.getReadableDatabase();
    }


    public void createTable(SQLiteDatabase db){
        String CREATE_USER_TABLE = "CREATE TABLE " + USER_TABLE + "("
                + KEY_USER_ID + " TEXT,"
                + KEY_USER_NAME + " TEXT,"
                + KEY_PASSWORD + " TEXT,"
                + KEY_MOBILE_NO + " TEXT,"
                + KEY_EMAIL_ID + " TEXT,"
                + KEY_PROFILE_IMAGE + " TEXT,"
                + KEY_FULL_NAME + " TEXT,"
                + KEY_DEVICE_ID + " TEXT,"
                + KEY_JOB_TITLE + " TEXT,"
                + KEY_HOME_ADDRESS + " TEXT,"
                + KEY_WORK_ADDRESS + " TEXT,"
                + KEY_WORK_PHONE + " TEXT " + ")";

        db.execSQL(CREATE_USER_TABLE);

        String CREATE_CONTACT_TABLE = "CREATE TABLE " + CONTACT_TABLE + "("
                + KEY_CONTACT_ID + " TEXT,"
                + KEY_CONTACT_NAME + " TEXT,"
                + KEY_CONTACT_MOBILE_NO + " TEXT,"
                + KEY_CONTACT_EMAIL_ID + " TEXT,"
                + KEY_CONTACT_PROFILE_IMAGE + " TEXT,"
                + KEY_CONTACT_FULL_NAME + " TEXT,"
                + KEY_CONTACT_JOB_TITLE+ " TEXT,"
                + KEY_CONTACT_WORK_ADDRESS + " TEXT,"
                + KEY_CONTACT_WORK_PHONE + " TEXT,"
                + KEY_CONTACT_HOME_ADDRESS + " TEXT " + ")";

        db.execSQL(CREATE_CONTACT_TABLE);

    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + USER_TABLE);
        db.execSQL("DROP TABLE IF EXISTS " + CONTACT_TABLE);

        context.deleteDatabase(Constants.DATABASE_NAME + ".db");

        createTable(db);

    }

}

我还尝试只删除表，但没有删除

---

问题是什么？有人能帮忙吗？谢谢..

请确保在删除之前关闭所有数据库连接。否则，您必须重新启动应用程序才能看到更改

String myPath = DB_PATH + DB_NAME;
SQLiteDatabase.deleteDatabase(new File(myPath));

或

如需了解更多详情。。

运行此行时，应删除数据库。

---

这是通过getDatabasePath（）创建数据库后删除数据库文件的正确方法。//

关于：删除方法在哪里？我尝试了context.deleteDatabase（数据库名称）；但它仍然没有被删除@Nikhil Borason升级方法从上到下交换最后两行。。删除后，您将创建一个新数据库。如果我交换，它将如何创建新数据库@Nikhil Boradosen没有帮助。@Nikhil Boradhsen如何获取您的路径此答案：String myPath=DB_path+DB_NAME；@Nikhil Boradi如果我重新启动应用程序，我仍然看不到更改@在删除之前，您是否确保与数据库的所有连接都已关闭？

 context.deleteDatabase(DATABASE_NAME);

context.deleteDatabase(DATABASE_NAME);