Android 闹钟设置

     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=0;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,0, 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, 0);
                                calendar.set(Calendar.MILLISECOND, 0);
                                /* 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, 0,
                                                intent, 0);
                                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()
                                        + (10 * 1000), (24 * 60 * 60 * 1000),
                                        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, 0, intent, 0);
                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() == 1)
            s = "0" + s;
        return s;
    }
}

代码:这里