Question

我的时间戳显示当前时间提前4小时（例如当前时间下午12:30，显示下午4:30）任何人都可以帮我改变这个吗？这是代码：

public class MessagesDBAdapter {

    public static final String KEY_RECIPIENT = "recipient";
    public static final String KEY_MESSAGE = "message";
    public static final String KEY_TIME = "time";
    public static final String KEY_ROWID = "_id";

    private static final String TAG = "MessagesDBAdapter";
    private DatabaseHelper mDbHelper;
    private SQLiteDatabase mDb;

     //Database creation sql statement

    private static final String DATABASE_CREATE =
             "create table notes (" + KEY_ROWID + " integer primary key autoincrement, "
        + KEY_RECIPIENT + " text not null, " + KEY_MESSAGE + " text not null, " + KEY_TIME + " TIMESTAMP DEFAULT CURRENT_TIMESTAMP);";

    private static final String DATABASE_NAME = "data";
    private static final String DATABASE_TABLE = "notes";
    public static final String KEY_TIMESTAMP = "timeStamp";
    private static final int DATABASE_VERSION = 3;


    private final Context mCtx;

    private static class DatabaseHelper extends SQLiteOpenHelper {

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

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

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                    + newVersion + ", which will destroy all old data");
            db.execSQL("DROP TABLE IF EXISTS notes");
            onCreate(db);
        }
    }

    /**
     * Constructor - takes the context to allow the database to be
     * opened/created
     * 
     * @param ctx the Context within which to work
     */
    public MessagesDBAdapter(Context ctx) {
        this.mCtx = ctx;
    }

    public MessagesDBAdapter open() throws SQLException {
        mDbHelper = new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        mDbHelper.close();
    }

    public long createNote(String phoneNo, String message) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_RECIPIENT, phoneNo);
        initialValues.put(KEY_MESSAGE, message);

        open();

        return mDb.insert(DATABASE_TABLE, null, initialValues);
    }

    public boolean deleteNote(long rowId) {

        return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
    }

    public Cursor fetchAllNotes() {

        return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RECIPIENT,
                KEY_MESSAGE, KEY_TIME}, null, null, null, null, KEY_TIME + " DESC");
    }

    public Cursor fetchNote(long rowId) throws SQLException {

        Cursor mCursor =

            mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                    KEY_RECIPIENT, KEY_MESSAGE, KEY_TIME}, KEY_ROWID + "=" + rowId, null,
                    null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;

    }

    public long saveMessages(Timestamp date, String phoneNo, String message) {
        ContentValues initialValues = createContentValues(date, phoneNo, message);
        return mDb.insert(DATABASE_TABLE, null, initialValues);
        }//

    private ContentValues createContentValues(Timestamp date, String phoneNo, String message) {
        ContentValues values = new ContentValues();
        values.put(KEY_TIME, date.toString());
        values.put(KEY_RECIPIENT, phoneNo);
        values.put(KEY_MESSAGE, message);
        return values;
        }//

    public Cursor getAllNotes() {

        Cursor mCursor = 

                mDb.rawQuery("SELECT _id, time, message, recipient, " +
                "datetime(timestampColumn, 'localtime') AS timestampColumn FROM notes", null);
        return mCursor;
    }

    public boolean updateMessage(long rowId, String phoneNo, String message) {
        ContentValues args = new ContentValues();
        args.put(KEY_RECIPIENT, phoneNo);
        args.put(KEY_MESSAGE, message);

        return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
    }
}

无论如何得到当前的时间戳？

Answer 1

使用

System.currentTimeMillis的（）;

获取本地区域的实时时间戳。将其与其他内容值一起插入。

Answer 2

数据库中的默认CURRENT_TIMESTAMP是GMT，而不是机器的时区 这可能是你的问题。您可以检索数据并转换为您的时区并显示给用户。

Answer 3

StringBuffer sb=new StringBuffer();

    Calendar c = Calendar.getInstance();

    System.out.println("current: " + c.getTime());

    Log.i("GMT +", c.getTime().toString());
    // Log.i("GMT +", c.getTimeZone().toString());
    String gmt = c.getTime().toString();
    // String gmt = c.getTimeZone().toString();


    TimeZone z = c.getTimeZone();

    int offset = z.getRawOffset();
    int offsetHrs = offset / 1000 / 60 / 60;
    int offsetMins = offset / 1000 / 60 % 60;

    System.out.println("offset: hours " + offsetHrs);
    System.out.println("offset: min " + offsetMins);

    c.add(Calendar.HOUR_OF_DAY, (-offsetHrs));
    c.add(Calendar.MINUTE, (-offsetMins));

Android时间戳错了

3 个答案: