经过一段时间后重复运行方法的服务

我想创建一个服务，一次又一次地在10秒后运行一个方法，直到我停止它，即使该应用程序已关闭。 我的尝试代码如下

package com.example.tauben; import java.util.Timer; import java.util.TimerTask; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class Reminder extends Service { @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { TimerTask task = new TimerTask() { public void run(){ f(); } }; Timer timer = new Timer(); timer.scheduleAtFixedRate(task, 0, 10000); } public void f(){ Toast t = Toast.makeText(this, "Service is still running", Toast.LENGTH_SHORT); t.show(); } } 

这就是我开始服务的方式。

 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.d(Log_TAG,"_____________RESTART__________"); Intent i= new Intent(this, Reminder.class); startService(i); } 

该程序立即停止运行; 如何更改我的代码以获得所需的行为？

Answer 1

创建一个广播接收器，它将在从AlarmManager接收广播后启动您的服务：

 public class SyncAlarm extends BroadcastReceiver { @Override public void onReceive(Context context, Intent data) { // set alarm to start service Calendar calendar = new GregorianCalendar(); calendar.setTimeInMillis(System.currentTimeMillis()); Calendar cal = new GregorianCalendar(); cal.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR)); cal.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY)); // start service after an hour cal.set(Calendar.MINUTE, calendar.get(Calendar.MINUTE) + 60); cal.set(Calendar.SECOND, calendar.get(Calendar.SECOND)); cal.set(Calendar.MILLISECOND, calendar.get(Calendar.MILLISECOND)); cal.set(Calendar.DATE, calendar.get(Calendar.DATE)); cal.set(Calendar.MONTH, calendar.get(Calendar.MONTH)); // set alarm to start service again after receiving broadcast AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(context, SyncAlarm.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_ONE_SHOT); am.cancel(pendingIntent); am.set(AlarmManager.RTC, cal.getTimeInMillis(), pendingIntent); intent = new Intent(context, Reminder.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startService(intent); } } 

在您启动应用程序时首次启动广播接收器：

  AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(context, SyncAlarm.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_ONE_SHOT); am.cancel(pendingIntent); am.set(AlarmManager.RTC, System.currentTimeMillis(), pendingIntent); 

另外将此添加到您的清单文件：

如果您希望在资源可用时立即由Android系统启动您的服务而不是通过AlarmManager接收广播，那么您也应该参与此START_STICKY 。