爲什麼AlarmManager不會立即啓動，即使設置10000毫秒？

Question

以下代碼必須在設置時間（單擊按鈕）10000毫秒後開始鬧鈴..但AlarmManager在點擊按鈕後立即啓動服務爲什麼？ package pit.opensource.notificationapp;

import java.util.Calendar; 

import android.app.Activity; 
import android.app.AlarmManager; 
import android.app.PendingIntent; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

public class NotificationAppActivity extends Activity { 

    private PendingIntent pendingIntent; 

    /** Called when the activity is first created. */ 

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main); 

     Button buttonStart = (Button)findViewById(R.id.btnset); 

     buttonStart.setOnClickListener(new Button.OnClickListener(){ 

      @Override 

      public void onClick(View arg0) { 

       setAlarm(); 
       //setAlarm(25); 

      }}); 

    } 

    void setAlarm(){ 

     Intent myIntent = new Intent(NotificationAppActivity.this, ShowNotification.class); 
     AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 

     alarmManager.cancel(pendingIntent); 

     pendingIntent = PendingIntent.getService(NotificationAppActivity.this, 445454, myIntent, 0); 



     //alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis()-cal2.getTimeInMillis(), pendingIntent); 
     alarmManager.set(AlarmManager.RTC_WAKEUP, 10000, pendingIntent); 


    } 

} 

ShowNotification服務

package pit.opensource.notificationapp; 
import android.app.Service; 
import android.content.Intent; 
import android.os.IBinder; 
import android.util.Log; 
import android.widget.Toast; 

public class ShowNotification extends Service { 

    @Override 
    public void onCreate() { 
     // TODO Auto-generated method stub 
    } 
    @Override 
    public IBinder onBind(Intent intent) { 
     // TODO Auto-generated method stub 
     return null; 
    } 
    @Override 
    public void onDestroy() { 
     // TODO Auto-generated method stub 
     super.onDestroy(); 
     Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show(); 
    } 
    @Override 
    public void onStart(Intent intent, int startId) { 
     // TODO Auto-generated method stub 
     super.onStart(intent, startId); 
     Toast.makeText(this, "Alaaaaaaaaaarm ", Toast.LENGTH_LONG).show(); 
     Log.d("Aalram","Alaaaaaaaaaarm"); 

    } 

} 

Answer 1

第二個參數是不是相對於現在的延遲，但時間報警應熄滅。使用類似System.currentTimeMillis() + 10000的東西。它會立刻消失，因爲你過去開始時間。