如何删除SQLite数据库android?-HowtodeleteSQLitedatabaseandroid?

I want to delete the SQLite database from device. I am trying to delete it but its not getting delete, because I can see the old records of database.

我想从设备中删除SQLite数据库。我正在尝试删除它，但是没有得到删除，因为我可以看到数据库的旧记录。

Trying to delete like this:

试着像这样删除:

        deleteDatabase(Constants.DATABASE_NAME);

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

Constants :

常量:

    public class Constants {

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

DatabaseHelper :

DatabaseHelper:

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);

    }

}

I also tried to delete only tables, but its not getting delete.

我也尝试只删除表，但它没有得到删除。

What can be the issue? Can anyone help please? Thank you..

有什么问题呢?谁能帮助好吗?谢谢你！

2 个解决方案

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

 context.deleteDatabase(DATABASE_NAME);