Android中AlarmManager使用示例（持续更新，已经更改）

现在普遍的手机都会有一个闹钟的功能，如果使用Android来实现一个闹钟可以使用AtarmManager来实现。AtarmManager提供了一种系统级的提示服务，允许你安排在将来的某个时间执行一个服务。AlarmManager对象一般不直接实例化，而是通过Context.getsystemservice(Context.ALARM_SERVICE）方法获得。

下面是我们运用之前用到的TimePickerDialog结合AlarmManager，实现一个可以设定任意时间而且可以重复的闹钟，演示效果如下（大概每晚23:48会有闹钟通知）：

layout中activity_main.xml布局文件代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.alarmdemo.MainActivity">
    <TextView
        android:id="@+id/time_tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请设置闹铃时间"
        android:clickable="true"
        android:onClick="setTime"
        android:gravity="center"/>
    <TextView
        android:id="@+id/time_tv2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请设置响铃间隔时间"
        android:clickable="true"
        android:onClick="setIntervalTime"
        android:gravity="center"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="open"
        android:text="开启闹钟"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="stop"
        android:text="结束闹钟"/>
</LinearLayout>

AndroidMainfest.xml配置文件（添加自定义重复闹铃receiver）：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.alarmdemo">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver
            android:name=".RepeatAlarmReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="repeatAlarm" />
            </intent-filter>
        </receiver>
        <activity android:name=".Main2Activity"></activity>
    </application>

</manifest>

RepeatAlarmReceiver.java广播接收文件：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class RepeatAlarmReceiver extends BroadcastReceiver {
    public RepeatAlarmReceiver() {
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "重复闹钟", Toast.LENGTH_SHORT).show();
    }
}

MainActivity.java代码实现：

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.TimePicker;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
    AlarmManager alarmManagerSet;
    PendingIntent pendingIntentSet;
    int myHour,myMinute;//声明响铃时间
    int intervalHour,intervalMinute,intervalSecond;//声明间隔时间（响铃周期）
    Calendar calendar;//声明日历
    TextView time_tv,time_tv2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        alarmManagerSet= (AlarmManager) getSystemService(ALARM_SERVICE);
        //设置声明时间格式
        calendar = Calendar.getInstance();
        myHour=calendar.get(Calendar.HOUR_OF_DAY);
        myMinute=calendar.get(Calendar.MINUTE);
        intervalHour=calendar.get(Calendar.HOUR_OF_DAY);
        intervalMinute=calendar.get(Calendar.MINUTE);
        //获取时间设置的TextView
        time_tv= (TextView) findViewById(R.id.time_tv);
        time_tv2= (TextView) findViewById(R.id.time_tv2);
    }
    //使用timePickerDialog设置闹铃响铃时间
    public void setTime(View view){
        TimePickerDialog timePickerDialog =new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                myHour=hourOfDay;
                myMinute=minute;
                time_tv.setText(myHour+":"+myMinute);
            }
        },myHour,myMinute,true);
        timePickerDialog.show();
    }
    //使用timePickerDialog设置闹铃响铃周期（间隔）
    public void setIntervalTime(View view){
        TimePickerDialog timePickerDialog =new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                intervalHour=hourOfDay;
                intervalMinute=minute;
                time_tv2.setText(intervalHour+":"+intervalMinute);
            }
        },intervalHour,intervalMinute,true);
        timePickerDialog.show();
    }
    public void open(View view){
        //分别获取闹铃响铃时间以及闹铃间隔时间（用冒号分割存储于数组中）
        String[] triggerTime=time_tv.getText().toString().split(":"); 
        String[] intervalTime=time_tv2.getText().toString().split(":");
        //通过Calendar分别获取对应的小时和分钟（需要将String转换为int）
        Calendar calendar1 = Calendar.getInstance();
        calendar1.set(Calendar.HOUR_OF_DAY,Integer.parseInt(triggerTime[0]));
        calendar1.set(Calendar.MINUTE,Integer.parseInt(triggerTime[1]));
        //得到点击触发的毫秒值（即闹钟提醒时间）
        long triggerAtMillis= calendar1.getTimeInMillis();
        //设定pendinngIntent接受自定义闹铃广播
        pendingIntentSet = PendingIntent.getBroadcast(this,0,new Intent("repeatAlarm"),0);
        //判断如果当前系统时间大于设置的闹铃时间，则在第二天开始启用该闹铃
        if(System.currentTimeMillis()>triggerAtMillis){
            triggerAtMillis=triggerAtMillis+24*60*60*1000;
        }
        //使用.setRepeating设置重复闹铃
        alarmManagerSet.setRepeating(AlarmManager.RTC_WAKEUP,triggerAtMillis,intervalMillis,pendingIntentSet);
    }
    public void stop(View v){
        alarmManagerSet.cancel(pendingIntentSet);
    }
}