Android - 將時間字符串與當前時間進行比較減去差值並轉換爲毫秒

Question

我對Java/Android開發有點新，我需要比較兩次。其中一個時間值存儲在一個字符串中，另一個存儲在系統時間的當前時間（長） - 我怎樣才能找出兩次以毫秒爲單位的差異並將其存儲爲一個數字？

編輯：

嘗試＃1（響應懶惰忍者）

public class Rules extends Activity { 

private String password; 

private PendingIntent mPendingIntent; 
String TIMELIMIT = "10"; 

TextView textSsid, textSpeed, textRssi, Time; 
private static final int NOTIFY_ME_ID = 1337; 
private int count = 0; 
private NotificationManager notifyMgr = null; 
public Handler mHandler = new Handler(); 
public long mStartRX = 0; 
public long mStartTX = 0; 
public long txBytes; 

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

    String NDEF_PREF = "prefs"; 
    SharedPreferences prefs = getSharedPreferences(NDEF_PREF, 
      Context.MODE_PRIVATE); 
    String name = prefs.getString("name", ""); 
    String code = prefs.getString("corename", ""); 
    String time = prefs.getString("time", ""); 
    String ssid = prefs.getString("restricted", ""); 
    Time = (TextView) findViewById(R.id.Time); 
    Time.setText(time); 

    String dtStart = "09:27:37"; 
    SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss"); 
    try { 
     Date date = format.parse(time); 
    } catch (ParseException e) { 
     e.printStackTrace(); 
    } 

    Long convertedLong = date.getTimeInMillis(); 

    long currentTimeLong = System.currentTimeMillis(); 
    long difference = currentTimeLong - convertedLong; 
    String strDiff = String.valueOf(difference); 

問題：

日期不能得到解決Rules.java的Java問題

Answer 1

確定轉換您的字符串到datetime：

String dtStart = "09:27:37"; 
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss"); 
try { 
    Date date = format.parse(dtStart); 
} catch (ParseException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} 

然後將其轉換爲毫秒

long convertedLong = date.getTimeInMillis(); 

然後

long currentTimeLong = System.currentTimeMillis(); // will get you current time in milli 
long difference = currentTimeLong - convertedLong; 
String strDiff = String.valueOf(difference); 

從那裏數學currentTimeLong - convertedLong。