如何自动启动AlarmManager以启动预定活动?

时间:2012-02-21 23:09:03

标签: android broadcastreceiver alarmmanager alarm autostart

本教程来自android-er, 主要活动(AndroidScheduledActivity.java)重复启动AlarmManager以触发BroadcastReceiver(MyScheduledReceiver.java)。在MyScheduledReceiver的onReceive()方法中,它间接启动另一个活动(MyScheduledActivity.java)。这样活动(MyScheduledActivity.java)将在预定的时间间隔内启动。 现在我会使用AutoStart自动启动,但我无法编写AutoStartNotifyReceiver。 请你能告诉我如何管理它吗? 非常感谢!

主要活动,AndroidScheduledActivity.java:

public class AndroidScheduledActivity extends Activity {

  /** 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.start);
      buttonStart.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
    Intent myIntent = new Intent(getBaseContext(),
      MyScheduledReceiver.class);

    PendingIntent pendingIntent
     = PendingIntent.getBroadcast(getBaseContext(),
       0, myIntent, 0);

    AlarmManager alarmManager
      = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.SECOND, 10);
    long interval = 60 * 1000; //
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
      calendar.getTimeInMillis(), interval, pendingIntent);
    finish();
  }});
  }

}

然后是BroadcastReceiver,MyScheduledReceiver.java

public class MyScheduledReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) {

 Intent scheduledIntent = new Intent(context, MyScheduledActivity.class);
 scheduledIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 context.startActivity(scheduledIntent);
}
}

和我的问题AutoStartNotifyReceiver:

public class AutoStartNotifyReceiver extends BroadcastReceiver {

 private final String BOOT_COMPLETED_ACTION = "android.intent.action.BOOT_COMPLETED";

 @Override
 public void onReceive(Context context, Intent intent) {

  if(intent.getAction().equals(BOOT_COMPLETED_ACTION)){

????????????????????

  }

 }
}

2 个答案:

答案 0 :(得分:6)

您的AutoStartNotifyReceiver extends BroadcastReceiver课程就在那里,因为当设备重置时警报会被清除。所以,在这个类的onReceive中(你有问号的地方)你需要用相同的代码(当然没有finish())重新设置警报它是onClick AndroidScheduledActivity方法中的第一次。

然后,您需要在Manifest中添加以下条目,让系统知道在系统启动时启动AutoStartNotifyReceiver

<receiver android:name=".AutoStartNotifyReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
        </intent-filter>
</receiver>

以及Manifest中的权限:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

现在,假设您只有一个警报,并且每次只设置一个警报。如果不是这样的话,那会更复杂一些。但根据您提供的小信息,我的解决方案应该做您想要的。

另外,既然你是这里的新手,只是一个善意的提醒:当有人提供问题的充分答案时,提出问题的人(你)会通过点击答案旁边的复选框接受答案。这是回答的人得到信任。欢迎来到SO!

答案 1 :(得分:1)

谢谢,它有效。只需要更多地改进我的java。我必须添加“上下文”,不知道为什么。

public class AutoStartNotifyReceiver extends BroadcastReceiver {
    private final String BOOT_COMPLETED_ACTION = "android.intent.action.BOOT_COMPLETED";
    public void onReceive(Context context, Intent intent) {
        if(intent.getAction().equals(BOOT_COMPLETED_ACTION)){

             Intent myIntent = new Intent(context, MyScheduledReceiver.class);
             PendingIntent pendingIntent = PendingIntent.getBroadcast(context,  0, myIntent, 0);

             AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
             Calendar calendar = Calendar.getInstance();
             calendar.setTimeInMillis(System.currentTimeMillis());
             calendar.add(Calendar.SECOND, 10);
             long interval = 60 * 1000;
             alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);           
        }
    }
}