需求：新的平臺要實現關機啟動，所以要了解一下鬧鐘的機制

這個鏈接寫得比較詳細（我只是動手試了試，畢竟應用不是專長）：http://www.cnblogs.com/mengdd/p/3819806.html

１、AlarmManager　這個是鬧鐘的核心　

里面有void set函數，void setInexactRepeating函數　通過這些函數來設置　

源碼鏈接：http://download.csdn.net/detail/weiqifa0/9173341

設置鬧鐘的代碼：

package com.example.helloworld;

import java.util.Calendar;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.TimePickerDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;

public class AlarmTest extends Activity
{
?? ?Button setTime;
?? ?AlarmManager aManager;
?? ?Calendar currentTime = Calendar.getInstance();

?? ?@Override
?? ?public void onCreate(Bundle savedInstanceState)
?? ?{
?? ??? ?super.onCreate(savedInstanceState);
?? ??? ?setContentView(R.layout.activity_main);

?? ??? ?setTime = (Button) findViewById(R.id.setTime);

?? ??? ?aManager = (AlarmManager) getSystemService(
?? ??? ??? ?Service.ALARM_SERVICE);

?? ??? ?setTime.setOnClickListener(new OnClickListener()
?? ??? ?{
?? ??? ??? ?@Override
?? ??? ??? ?public void onClick(View source)
?? ??? ??? ?{
?? ??? ??? ??? ?Calendar currentTime = Calendar.getInstance();
?? ??? ??? ??? ?new TimePickerDialog(AlarmTest.this, 0,
?? ??? ??? ??? ??? ?new TimePickerDialog.OnTimeSetListener()
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ?@Override
?? ??? ??? ??? ??? ??? ?public void onTimeSet(TimePicker tp,
?? ??? ??? ??? ??? ??? ??? ?int hourOfDay, int minute)
?? ??? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ??? ??? ?Intent intent = new Intent(AlarmTest.this,
?? ??? ??? ??? ??? ??? ??? ??? ?AlarmActivity.class);
?? ??? ??? ??? ??? ??? ??? ?PendingIntent pi = PendingIntent.getActivity(
?? ??? ??? ??? ??? ??? ??? ??? ?AlarmTest.this, 0, intent, 0);
?? ??? ??? ??? ??? ??? ??? ?Calendar c = Calendar.getInstance();
?? ??? ??? ??? ??? ??? ??? ?c.set(Calendar.HOUR, hourOfDay);
?? ??? ??? ??? ??? ??? ??? ?c.set(Calendar.MINUTE, minute);
?? ??? ??? ??? ??? ??? ??? ?aManager.set(AlarmManager.RTC_WAKEUP,
?? ??? ??? ??? ??? ??? ??? ??? ?c.getTimeInMillis(), pi);? //這個是代碼的核心部分 ??? ??? ??? ??? ??? ????
?? ??? ??? ??? ??? ??? ??? ?Toast.makeText(AlarmTest.this, "設置鬧鐘成功"
?? ??? ??? ??? ??? ??? ??? ??? ?, Toast.LENGTH_SHORT).show();
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?}, currentTime.get(Calendar.HOUR_OF_DAY), currentTime
?? ??? ??? ??? ??? ??? ?.get(Calendar.MINUTE), false).show();
?? ??? ??? ?}
?? ??? ?});
?? ?}
}

到時后就會去啟動另一個Activity ,核心代碼如下：

package com.example.helloworld;
?
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.widget.Toast;
?
/**
?* Description:
?* <br/>��?: <a href="http://www.crazyit.org">���Java����</a>
?* <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
?* <br/>This program is protected by copyright laws.
?* <br/>Program Name:
?* <br/>Date:
?* @author? Yeeku.H.Lee kongyeeku@163.com
?* @version? 1.0
?*/
public class AlarmActivity extends Activity
{
?? ?MediaPlayer alarmMusic;
?
?? ?@Override
?? ?public void onCreate(Bundle savedInstanceState)
?? ?{
?? ??? ?super.onCreate(savedInstanceState);
?? ??? ?Toast.makeText(AlarmActivity.this, "設置鬧鐘時間到"
?? ??? ??? ??? ?, Toast.LENGTH_SHORT).show();
?? ??? ?new AlertDialog.Builder(AlarmActivity.this).setTitle("����")
?? ??? ??? ?.setMessage("１,２")
?? ??? ??? ?.setPositiveButton("ＯＫ", new OnClickListener()
?? ??? ??? ?{
?? ??? ??? ??? ?@Override
?? ??? ??? ??? ?public void onClick(DialogInterface dialog, int which)
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?// ??����
?? ??? ??? ??? ??? ?//alarmMusic.stop();
?? ??? ??? ??? ??? ?// �����Activity 　　//瘋狂android里面顯示的聲音　簡單的用法我把聲音去掉了
?? ??? ??? ??? ??? ?AlarmActivity.this.finish();
?? ??? ??? ??? ?}
?? ??? ??? ?}).show();
?? ?}
}

AndroidMainfest.xml的代碼，每一個Activity都要在里面注冊，我第一次寫的時候沒有注冊，結果啟動不成功

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
??? package="com.example.helloworld"
??? android:versionCode="1"
??? android:versionName="1.0" >

??? <uses-sdk
??????? android:minSdkVersion="8"
??????? android:targetSdkVersion="18" />

??? <application
??????? android:allowBackup="true"
??????? android:icon="@drawable/ic_launcher"
??????? android:label="@string/app_name"?????? ?
??????? android:theme="@style/AppTheme" >
??????? <activity
??????????? android:name="com.example.helloworld.AlarmTest"
??????????? android:label="@string/app_name" >
??????????? <intent-filter>
??????????????? <action android:name="android.intent.action.MAIN" />

??????????????? <category android:name="android.intent.category.LAUNCHER" />
??????????? </intent-filter>
??????? </activity>
?? ??? ?<activity android:name=".AlarmActivity"/>　//剛開始忘記了這行代碼
??? </application>

</manifest>

總結

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