Android天文臺自己實現

Question

我開發了一個自己的天文臺實現。我做了如下：

1. 創建服務（CronoService），使用該執行的線程Runnable對象。 Runnable將循環每個0.1秒。

2. Messenger對象將接收來自Ui的消息以啓動，暫停或恢復計時器。

3. 將在每個Runnable對象循環後廣播時間的意圖。

的代碼是：

public class CronoService extends Service { 

public static final int PARAR = 0; 
public static final int EMPEZAR = 1; 
public static final int ESTABLECER_TIEMPO = 2; 

private static final String TAG = "BroadcastService"; 

public static final String BROADCAST_ACTION = "jose.planilla.mostrartiempo"; 
final Messenger mMessenger = new Messenger(new IncomingHandler()); 

private final Handler handler = new Handler(); 
private Intent intent; 
private long mDec; 
private long mTotalMilis; 
private long mLastMilis; 
private long mElapsedTime; 
private long mCurrentMilis; 
private int mSeconds; 
private int mMin; 

private Runnable sendUpdatesToUI = new Runnable() { 
    public void run() { 
     mCurrentMilis = System.currentTimeMillis(); 
     mElapsedTime = mCurrentMilis - mLastMilis; 
     mLastMilis = mCurrentMilis; 
     mTotalMilis += mElapsedTime; 
     DisplayLoggingInfo(); 
     handler.postDelayed(this, 100); // 0.1 seconds 
     Log.d("run()", String.valueOf(mTotalMilis)); 
    } 
}; 



@Override 
public void onCreate(){ 
    super.onCreate(); 

    intent = new Intent(BROADCAST_ACTION); 

} 

@Override 
public void onStart(Intent intent, int startId){ 
    mTotalMilis = intent.getLongExtra("milis", 0); 
    handler.removeCallbacks(sendUpdatesToUI); 
    handler.postDelayed(sendUpdatesToUI, 100); // 0.1 second 
} 

@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
    Log.d(TAG, "onStart()"); 
    mLastMilis = mElapsedTime = System.currentTimeMillis(); 
    mTotalMilis = intent.getLongExtra("milis", 0); 
    handler.removeCallbacks(sendUpdatesToUI); 
    DisplayLoggingInfo(); 
    //handler.postDelayed(sendUpdatesToUI, 100); // 0.1 second 

    return START_NOT_STICKY; 
}  

@Override 
public IBinder onBind(Intent arg0) { 
    return mMessenger.getBinder(); 
} 


private void DisplayLoggingInfo() { 
    String tiempo; 

    mDec = mTotalMilis % 1000; 
    mDec = mDec/100; 
    mSeconds = (int) (mTotalMilis/1000); 
    mMin = mSeconds/60; 
    mSeconds = mSeconds % 60; 
    tiempo = "" + mDec; 

    if(mSeconds < 10) 
     tiempo = ":0" + mSeconds + "." + tiempo; 
    else 
     tiempo = ":" + mSeconds + "." + tiempo; 

    if(mMin < 10) 
     tiempo = "0" + mMin + tiempo; 
    else 
     tiempo = mMin + tiempo; 

    intent.putExtra("tiempo", tiempo); 
    intent.putExtra("milis", mTotalMilis); 
    sendBroadcast(intent); 
} 

@Override 
public void onDestroy() {  
    handler.removeCallbacks(sendUpdatesToUI); 
    super.onDestroy(); 
} 

public void pause(){ 
    handler.removeCallbacks(sendUpdatesToUI); 
} 

public void resume(){ 
    handler.postDelayed(sendUpdatesToUI, 100); 
} 

class IncomingHandler extends Handler { 
    @Override 
    public void handleMessage(Message msg){ 
     switch(msg.what) { 
      case PARAR: 
       pause(); 
       break; 
      case EMPEZAR: 
       resume(); 
       break; 
      case ESTABLECER_TIEMPO: 
       mTotalMilis = (Long) msg.obj; 
       break; 
      default: 
       super.handleMessage(msg); 
     } 
    } 
} 

我的問題是，我的天文臺表比正常的速度慢了一點。它每秒鐘都會丟失一點時間。 我做錯了什麼，但我找不到問題。 非常感謝。

編輯 更新了工作代碼。

Answer 1

有已經工作的罰款對我來說更簡單的方法：用Sistem.getCurrentMillis()

玩看看這個： Android: Chronometer with Milliseconds?