Question

我正在创建一个应用程序，用户可以为朋友的生日设置提醒，但我坚持将日期类型存储在数据库中，并且还设置了通知，正如我在标题中所述，在指定之前日期。

我该怎么做？

这是我的代码，我只是在文本按钮上显示用户选择的日期，但我想存储该日期并在特定日期前2-3周设置通知。

这是我的代码：

@SuppressLint("ValidFragment")
public class DatePickerFragment extends DialogFragment
        implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        mYear = year;
        mMonth = monthOfYear;
        mDay = dayOfMonth;

        // set selected date in button
        addBirthdayDate.setText(new StringBuilder().append(mMonth + 1)
        .append("-").append(mDay).append("-").append(mYear)
        .append("-"));
    }
}

数据库代码（我在数据库中尝试了一些东西，但我不确定我在做什么）。所以我很感激这里的任何帮助：

public class DBHelper extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 5;
private static final String DATABASE_NAME = "_database";

private static final String BIRTHDAY_TABLE_NAME = "birthday_table";
public static final String BIRTHDAY_ID = "birthday_id";
public static final String BIRTHDAY_NAME = "birthday_name";
public static final String BIRTHDAY_LAST_NAME = "birthday_last_name";
public static final String BIRTHDAY_GENDER = "birthday_gender";
public static final String BIRTHDAY_AGE = "birthday_age";
public static final String BIRTHDAY_DATE = "birthday_date";

private static final String CREATE_TABLE = "CREATE TABLE " + BIRTHDAY_TABLE_NAME + " ( "
        + BIRTHDAY_ID + " INTEGER PRIMARY KEY,"
        + BIRTHDAY_NAME + " TEXT,"
        + BIRTHDAY_LAST_NAME + " TEXT,"
        + BIRTHDAY_GENDER + " TEXT,"
        + BIRTHDAY_DATE + " DATETIME,"
        + BIRTHDAY_AGE + " INTEGER );";

SQLiteDatabase database;

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

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_TABLE);
}

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

public String getDateTime() {
    SimpleDateFormat dateFormat = new SimpleDateFormat(
            "yyyy-MM-dd HH:mm:ss", Locale.getDefault());
    Date date = new Date();
    return dateFormat.format(date);
}

public void setBirthdayData(String birthdayName, String birthdayLastName, String birthdayGender
,int age) {
    database = getWritableDatabase();
    ContentValues cv = new ContentValues();
    cv.put(BIRTHDAY_NAME, birthdayName);
    cv.put(BIRTHDAY_LAST_NAME, birthdayLastName);
    cv.put(BIRTHDAY_GENDER, birthdayGender);
    cv.put(BIRTHDAY_AGE, age);
    cv.put(BIRTHDAY_DATE, getDateTime());
    database.insert(BIRTHDAY_TABLE_NAME, null, cv);
}

Answer 1

如果您仍然有这种担忧，我认为没有必要将其存储在数据库中。只需将其存储在变量中，随时设置警报管理器，如果您不再需要通知，则可以将其删除。

如果您仍想在数据库中存储日期时间，我建议将它们存储为Integer。这是我在我的应用程序中存储时间戳的示例：

private static final String CREATE_TABLE_NOTE = "create table "
        + Constants.NOTES_TABLE
        + "("
        + Constants.COL_ID + " integer primary key autoincrement, "
        + Constants.COL_TITLE + " text not null, "
        + Constants.COL_CONTENT + " text, "
        + Constants.COL_TYPE + " text not null, "
        + Constants.COL_CATID + " integer not null, "
        + Constants.COL_CREATED_TIME + " integer not null, "
        + Constants.COL_MODIFIED_TIME + " integer not null "
        + ")";

如何在指定日期之前在Android中设置通知

1 个答案: