在Android中可以通过AlarmManager 来实现闹钟，AlarmManager类是专门用来设定在某个指定的时间去完成指定的事件。AlarmManager 提供了访问系统警报的服务，只要在程序中设置了警报服务，AlarmManager 就会通过onReceive()方法去执行这些事件，就算系统处于待机状态，同样不会影响运行。可以通过 Context.getSystemService 方法来获得该服务。 AlarmManager 中的方法很少。如下所示
AlarmManager 的方法
方法 说明
cancel 取消AlarmManager服务
set 设置AlarmManager服务
setInexactRepeating 设置不精确周期
setRepeating 设置精确周期
setTimeZone 设置时区
要实现闹钟，首先需要创建一个继承自 BroadcastReceiver 的类，实现 onReceive
方法来接收这个Alarm服务，然后通过建立Intent 和 PendingIntent连接来调用
Alarm组件。当我们点击“设置闹钟”按钮时，通过 TimePickerDialog 来设置时间，当时间到我们指定的时间后onReceive
方法接收Alarm服务 运行效果见下图
设置闹钟时间
时间到后的Toast提示
首先看看我们实现的接收 Alarm 服务的 AlarmReceiver类，很简单，就是在收到消息后用一个 Toast 来提示用户，代码如下：
首先，要用到闹钟，就要用到BroadcastReceiver，比如，在闹钟响时就显示一句话，那么这个类的代码如下：
package com.FeifeiSchedule.activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
/*
* author:Tammy Pi
* function:用于闹钟提醒的broadcase
*/
public class MyBroadCast extends BroadcastReceiver{ @Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
Log.i("info","进入");
Toast.makeText(arg0,"闹钟响了",Toast.LENGTH_SHORT).show();
}
}
要用到Receiver，那么就需要在AndroidMainfest.xml中声明，该声明放在application中，activity后：
<!-- 设置Receiver -->
<receiver
android:name=".MyBroadCast"
android:process=":remote">
</receiver>
然后，再查下数据库，满足条件的全部设置上闹钟：
//循环数据库，将闹钟事件放入
List<TbSchedule> alarmList = FeifeiScheduleService.getInstance(this).findAlarmSchedule();
for(int i=;i<alarmList.size();i++){ AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(FeifeiScheduleActivity.this,MyBroadCast.class);
TbSchedule tbSchedule = alarmList.get(i);
PendingIntent pi = PendingIntent.getBroadcast(FeifeiScheduleActivity.this,, intent, PendingIntent.FLAG_UPDATE_CURRENT); Calendar calendar = Calendar.getInstance();
Date date = null;
try {
date = new SimpleDateFormat("yyyy-MM-dd hh:mm").parse(tbSchedule.getMydate());
TimeZone tm = TimeZone.getTimeZone("GMT");
calendar.setTimeZone(tm);
calendar.clear();
calendar.setTime(date); //设置闹钟时间
alarmManager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pi);
myMap.put(tbSchedule.getScheduleid(),pi);
}catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i("info",e.getMessage());
}
}
然后就只需要对"设置闹钟"、"取消闹钟" 的事件进行监听了，代码如下：
package com.yarin.android.Examples_07_07; import java.util.Calendar; import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker; public class Activity01 extends Activity {
Button mButton1;
Button mButton2; TextView mTextView; Calendar calendar; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.main);
calendar = Calendar.getInstance(); mTextView = (TextView) findViewById(R.id.TextView01);
mButton1 = (Button) findViewById(R.id.Button01);
mButton2 = (Button) findViewById(R.id.Button02); mButton1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
calendar.setTimeInMillis(System.currentTimeMillis());
int mHour = calendar.get(Calendar.HOUR_OF_DAY);
int mMinute = calendar.get(Calendar.MINUTE);
new TimePickerDialog(Activity01.this,
new TimePickerDialog.OnTimeSetListener() {
public void onTimeSet(TimePicker view,
int hourOfDay, int minute) {
calendar.setTimeInMillis(System
.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, );
calendar.set(Calendar.MILLISECOND, );
/* 建立Intent和PendingIntent，来调用目标组件 */
Intent intent = new Intent(Activity01.this,
AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent
.getBroadcast(Activity01.this, ,
intent, );
AlarmManager am;
/* 获取闹钟管理的实例 */
am = (AlarmManager) getSystemService(ALARM_SERVICE);
/* 设置闹钟 */
am.set(AlarmManager.RTC_WAKEUP, calendar
.getTimeInMillis(), pendingIntent);
/* 设置周期闹 */
am.setRepeating(AlarmManager.RTC_WAKEUP, System
.currentTimeMillis()
+ ( * ), ( * * * ),
pendingIntent);
String tmpS = "设置闹钟时间为" + format(hourOfDay)
+ ":" + format(minute);
mTextView.setText(tmpS);
}
}, mHour, mMinute, true).show();
}
}); mButton2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Activity01.this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
Activity01.this, , intent, );
AlarmManager am;
/* 获取闹钟管理的实例 */
am = (AlarmManager) getSystemService(ALARM_SERVICE);
/* 取消 */
am.cancel(pendingIntent);
mTextView.setText("闹钟已取消！");
}
});
} /* 格式化字符串(7:3->07:03) */
private String format(int x) {
String s = "" + x;
if (s.length() == )
s = "" + s;
return s;
}
}
代码:这里