将Android时间选择器小时数和MInutes添加到Android中的SQLite数据库

Question

嗨，我是初学的Android程序员。我试图在SQLiteDatabase中添加TimePicker小时和分钟。我的代码工作正常，但是当我查看数据库表时，我看到的唯一的事情是列小时和列分钟。下面是我的代码：我的主类，DatabaseHandler类和Constructor类。

我的MainActivity课程：

public class MainActivity extends Activity {

    static final int TIME_DIALOG_ID = 999;

    private TextView tvDisplayTime;
    private TimePicker timePicker1;
    private Button btnChangeTime;

    private int hour;
    private int minute;
    DataBaseHandler db;

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

        db = new DataBaseHandler(this);

        setCurrentTimeOnView();
        addListenerOnButton();
    }

    public void setCurrentTimeOnView() {

        tvDisplayTime = (TextView) findViewById(R.id.tvTime);
        timePicker1 = (TimePicker) findViewById(R.id.timePicker1);

        final Calendar c = Calendar.getInstance();
        hour = c.get(Calendar.HOUR_OF_DAY);
        minute = c.get(Calendar.MINUTE);

        tvDisplayTime.setText(new StringBuilder().append(pad(hour)).append(":").append(pad(minute)));

        timePicker1.setCurrentHour(hour);
        timePicker1.setCurrentMinute(minute);
    }

    public void addListenerOnButton() {
        btnChangeTime = (Button) findViewById(R.id.btnChangeTime);
        btnChangeTime.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                showDialog(TIME_DIALOG_ID);
            }
        });
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case TIME_DIALOG_ID:
                return new TimePickerDialog(this, timePickerListener, hour, minute, false);
        }
        return null;
    }

    private TimePickerDialog.OnTimeSetListener timePickerListener = new TimePickerDialog.OnTimeSetListener() {

        @Override
        public void onTimeSet(TimePicker view, int selectedHour, int selectedMinute) {
            hour = selectedHour;
            minute = selectedMinute;

            tvDisplayTime.setText(new StringBuilder().append(pad(hour)).append(":").append(pad(minute)));

            timePicker1.setCurrentHour(hour);
            timePicker1.setCurrentMinute(minute);

            final Calendar c = Calendar.getInstance();
            hour = 5;
            minute = 56;

            String HourPrompt = String.valueOf(hour);
            String MinutePrompt = String.valueOf(minute);

            db.addTheTime(new TimeConstructor(HourPrompt, MinutePrompt));
            Toast.makeText(getApplicationContext(), "Time Saved", Toast.LENGTH_LONG).show();
        }
    };

    private static String pad(int c) {
        if (c >= 10)
            return String.valueOf(c);
        else
            return "0" + String.valueOf(c);
    }
}

我的SQLiteOpenHelper：

public class DataBaseHandler extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "SampleDatabase";
    private static final String TABLE_TIME = "time";
    public static final String HOUR = "hour";
    public static final String MINUTE = "minute";
    public static final String CREATE_TIME = "create table TABLE_TIME (hour text not null, minute text not null);";

    SQLiteDatabase db;

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

    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TIME);
    }

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        db.execSQL("DROP TABLE IF EXISTS " + TABLE_TIME);

        onCreate(db);
    }

    public void addTheTime(TimeConstructor prompt) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues theTime = new ContentValues();
        theTime.put(HOUR, prompt.hour);
        theTime.put(MINUTE, prompt.minute);

        db.insert(TABLE_TIME, null, theTime);
        db.close();
    }

    public Cursor returndata() {
        SQLiteDatabase db = this.getReadableDatabase();
        return db.query(TABLE_TIME, new String[]{HOUR, MINUTE}, null, null, null, null, null);
    }
}

我的TimeConstructor课程：

public class TimeConstructor {

    String hour;
    String minute;

    public TimeConstructor(String newHour, String newMinute) {
        this.hour = newHour;
        this.minute = newMinute;
    }
}