AlarmManager 闹钟服务

 一.闹钟服务流程

1.0.AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 获得系统提供的AlarmManager服务的对象
1.1.Intent设置要启动的组件: Intent intent = new Intent(MainActivity.this, SecondActivity.class);
1.3.PendingIntent对象设置动作,启动的是Activity还是Service,又或者是广播!

?

1 2 3 4 5

PendingIntent pi = PendingIntent.getActivity(MainActivity.this, 0, intent, 0); 注意:      a.获取的是getActivity、getService、getBroadcast      b.假如你用的是alarmManager发送广播,广播再激活Activity的话，        则需要为Intent设置一个flag: intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

1.4.调用AlarmManager的set( )方法设置单次闹钟的闹钟类型,启动时间以及PendingIntent对象

?

1 2 3 4 5 6

alarmManager.set(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(), pi); 注意:      a.set(int type,long startTime,PendingIntent pi)：一次性闹钟      b.setExact(int type, long triggerAtMillis, PendingIntent operation): 在规定的时间精确的执行闹钟，比set方法设置的精度更高      c.setRepeating(int type，long startTime，long intervalTime，PendingIntent pi): 重复性闹钟,和3有区别,3闹钟间隔时间不固定      d.cancel(PendingIntent pi): 取消AlarmManager的定时服务

 

 二.举个栗子……

2.0. 实例每天23:59:00 闹钟

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

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.util.Log;   public class MainActivity extends Activity {       AlarmManager alarmManager;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);         Calendar calendar = Calendar.getInstance();         calendar.set(Calendar.HOUR_OF_DAY, 23);         calendar.set(Calendar.MINUTE, 59);         calendar.set(Calendar.SECOND, 0);         calendar.set(Calendar.MILLISECOND, 0);           Intent intent = new Intent();         intent.setClassName("com.gatsby.networktime", "com.gatsby.networktime.SecondActivity");         intent.putExtra("msg", "helloWorld");           // 当前系统 时间戳         long systemTime = System.currentTimeMillis();         Log.d("gatsby", "systemTime->" + System.currentTimeMillis());         // 闹钟 时间戳         long alarmTime = calendar.getTimeInMillis();         Log.d("gatsby", "alarmTime->" + calendar.getTimeInMillis());           if (systemTime > alarmTime) {             // 如果设置的时间小于当前时间,闹钟时间 将添加一天,即明天             calendar.add(Calendar.DAY_OF_YEAR, 1);             alarmTime = calendar.getTimeInMillis();             Log.d("gatsby", "alarmTime2->" + calendar.getTimeInMillis());         }           PendingIntent pi = PendingIntent.getActivity(MainActivity.this, 0, intent, 0);         // 重复每天提醒         alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime, AlarmManager.INTERVAL_DAY, pi);         Log.d("gatsby", "alarmTime.setRepeating->" + calendar.getTimeInMillis());       }   }

2.1.取消闹钟

?

1	alarmManager.cancel(pi);