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  • 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!

    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

    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

    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

    alarmManager.cancel(pi);
    

      

      

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  • 原文地址:https://www.cnblogs.com/crushgirl/p/14486250.html
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