[Android]使用AlarmManager设置周期性任务

设置周期性任务每隔一小时执行一次任务

闹钟

import android.app.AlarmManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.os.SystemClock/// 4.设置闹钟
/// 1小时
fun setupAlarmAction(context: Context) {val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManagerval intent = Intent(context, MyAlarmReceiver::class.java)// 设置 PendingIntent 时使用了 PendingIntent.FLAG_UPDATE_CURRENT 标志，这意味着如果相同的 PendingIntent 已经存在，它将被更新，而不是创建新的 PendingIntent。val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)// 设置每小时触发一次的闹钟val interval = AlarmManager.INTERVAL_HOURval triggerAtMillis = SystemClock.elapsedRealtime() + intervalalarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,triggerAtMillis,interval,pendingIntent)
}/// 30秒
fun setupAlarmAction1(context: Context) {val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManagerval intent = Intent(context, MyAlarmReceiver::class.java)val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)// 设置每30秒触发一次的闹钟val interval: Long = 20000L // 30秒 = 30,000毫秒val triggerAtMillis = SystemClock.elapsedRealtime() + intervalalarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,triggerAtMillis,interval,pendingIntent)
}

MyAlarmReceiver

import android.app.ActivityManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.os.PowerManager
import com.mofang.call.callphone.utils.NSLog/// 每小时打开屏幕一次，避免设备强制睡眠
class MyAlarmReceiver : BroadcastReceiver() {override fun onReceive(context: Context, intent: Intent) {NSLog("MyAlarmReceiver onReceive")// 重启应用restartApp(context)}/*** 检查应用是否正在运行：通过 ActivityManager 检查应用是否正在运行。* 根据应用状态决定是否重启：如果应用正在运行，则只打开应用；如果应用被杀掉，则重启应用。* */private fun restartApp(context: Context) {val packageManager = context.packageManagerval packageName = context.packageNameval intent = packageManager.getLaunchIntentForPackage(packageName)if (intent != null) {NSLog("MyAlarmReceiver 重启APP")/// 2if (isAppInForeground(context, packageName)) {// 如果应用正在前台运行，忽略启动操作NSLog("应用正在前台运行，忽略启动操作")return} else {// 打开屏幕NSLog("打开屏幕")// 获取电源管理器val powerManager = context.getSystemService(Context.POWER_SERVICE) as PowerManager// 获取 PowerManager 实例，用于控制设备电源状态val wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK orPowerManager.ACQUIRE_CAUSES_WAKEUP orPowerManager.ON_AFTER_RELEASE, "MyApp::MyWakeLockTag")// 创建一个 WakeLock，确保设备在启动应用时保持唤醒状态。获取 WakeLock 并保持 10 分钟（防止设备在这段时间内进入休眠）wakeLock.acquire(10*60*1000L /*10 minutes*/)// 释放 WakeLock，允许设备在适当时机进入休眠wakeLock.release()}}}/// 判断APP是否在前台运行private fun isAppInForeground(context: Context, packageName: String): Boolean {val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManagerval runningAppProcesses = activityManager.runningAppProcessesfor (processInfo in runningAppProcesses) {if (processInfo.processName == packageName) {if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {return true}}}return false}}

AndroidManifest.xml

    <!-- AlarmManager闹钟管理权限 --><uses-permission android:name="android.permission.WAKE_LOCK" /><application><!-- 闹钟管理 --><receiver android:name=".MyAlarmReceiver"android:enabled="true"android:exported="false"><intent-filter><action android:name="android.intent.action.BOOT_COMPLETED" /></intent-filter></receiver></application>

首页

当你从登录页进入首页时设置了一次 AlarmManager 闹钟，然后退出登录再次进入首页并重新设置一次 AlarmManager 闹钟，此时你实际上只有一个闹钟。原因是你在设置 PendingIntent 时使用了 PendingIntent.FLAG_UPDATE_CURRENT 标志，这意味着如果相同的 PendingIntent 已经存在，它将被更新，而不是创建新的 PendingIntent。

/*** 首页* */
class StartPageActivity : BaseActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)// 设置 AlarmManagersetupAlarmAction(this)}}