Question

我的代码在单击按钮时运行得非常好，但我现在需要自动在Alarm Service中运行它。当我调用方法（updateDays()）在**Runnable**接口中执行时，它根本不会被调用。数据库未按预期更新。我真的做得对吗？

DbAdapter  mDbHelper;

Cursor mCursor;

Runnable mUpdateTask = new Runnable() {
    public void run() {
      long maxWaitTime = System.currentTimeMillis() + 10*1000;
      while (System.currentTimeMillis() < maxWaitTime) {
        synchronized (mBinder) {
          try {
             updateDays();
             mBinder.wait(maxWaitTime - System.currentTimeMillis());
          } catch (Exception e) {

          }
       }
   }
}



private void updateDays() {
    mDbHelper.open();
    if(mCursor != null) {
      mDbHelper.updateDL (DbAdapter.KEY_ID,
               mCursor.getInt(mCursor.getColumnIndex(DbAdapter.KEY_DAYS))-1,
               DbAdapter.KEY_DATE_TIME);
      mDbHelper.close();

Toast.makeText(this, "Update done !", Toast.LENGTH_SHORT).show();
}

}

修改

广播接收器中的

onReceive 方法

public void onReceive(Context context, Intent intent) {
int rowid = intent.getExtras().getInt(DbAdapter.KEY_ID);

        Intent i = new Intent(context, AlarmService.class);
        i.putExtra(DbAdapter.KEY_ID, rowid);
        context.startService(i);
        }

编辑2

我的服务**onCreate**方法

@Override
public void onCreate() {
mNofitication = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

displayNotification();

Thread tr = new Thread(null, mUpdateTask, "AlarmService");
tr.start();
}

Answer 1

如果您的服务覆盖NullPointerException并且不链接到超类，那么我可以看到您可以在IntentService.java的第116行获得onCreate()的唯一方法。

Answer 2

根据您的要求，我觉得您需要使用待处理的意图以及警报管理器。相同的样本如下所示：

//Creating a PendingIntent
Intent intent = new Intent(MainActivity.this, MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(
MainActivity.this, UNIQUE_ID_RANDOM, intent, 0);
//Creating an AlarmManager and setting the pendingIntent to him
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
+ (5 * 1000), pendingIntent);
Toast.makeText(MainActivity.this, "Alarm set in " + 5 + " seconds",
Toast.LENGTH_SHORT).show();

现在在服务开始后你说5秒，你可以把你的上面的代码，并试一试。以下是样本：

public class MyService extends Service{

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

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    //Your database opening code should come here. But take care of the syntax related constructs.
    return START_NOT_STICKY;
 }


@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}

}

我希望这会对你有所帮助。

此致

ZAX

如何在Android中的AlarmManager中更新SQLite数据库值

2 个答案: