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| 保活的核心思路
Android 限制后台运行，但以下机制能最大限度保活：
启动一个前台服务（Foreground Service）
系统认为“前台服务 = 用户主动任务”，不会轻易杀。
应用被杀后，可通过 BOOT_COMPLETED 或 WORKMANAGER 自动重启
创建service
/**
* 前台保活服务 + 告警通知
*/
class KeepAliveService : Service() {
override fun onCreate() {
super.onCreate()
startForegroundNotification()
}
private fun startForegroundNotification() {
val channelId = "keep_alive_channel"
val channelName = "后台保活服务"
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channel = NotificationChannel(
channelId,
channelName,
NotificationManager.IMPORTANCE_LOW
)
getSystemService(NotificationManager::class.java)?.createNotificationChannel(channel)
}
val notification = NotificationCompat.Builder(this, channelId)
.setContentTitle("应用后台运行中")
.setContentText("保持应用活动")
.setSmallIcon(R.mipmap.logo) // 替换成你的图标
.setOngoing(true)
.build()
startForeground(1001, notification)
}
override fun onBind(intent: Intent?): IBinder? = null
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
// 保活策略
return START_STICKY
}
companion object {
/**
* 启动前台保活服务
*/
fun start(context: Context) {
val intent = Intent(context, KeepAliveService::class.java)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(intent)
} else {
context.startService(intent)
}
}
/**
* 发送告警通知
*/
fun showAlarmNotification(context: Context, title: String, content: String) {
// Android 13+ 需要检查通知权限
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
if (ContextCompat.checkSelfPermission(context, Manifest.permission.POST_NOTIFICATIONS)
!= PackageManager.PERMISSION_GRANTED
) {
// 没权限，直接返回
return
}
}
val channelId = "alarm_channel"
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channel = NotificationChannel(
channelId,
"告警通知",
NotificationManager.IMPORTANCE_HIGH
)
context.getSystemService(NotificationManager::class.java)?.createNotificationChannel(channel)
}
// 创建点击通知跳转的 Intent
val intent = Intent(context, NotificationActivity::class.java) // 替换为你要跳转的 Activity
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
val pendingIntent = PendingIntent.getActivity(
context,
0,
intent,
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
PendingIntent.FLAG_IMMUTABLE
else
0
)
val notification = NotificationCompat.Builder(context, channelId)
.setContentTitle(title)
.setContentText(content)
.setSmallIcon(R.mipmap.logo)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
.build()
NotificationManagerCompat.from(context).notify(System.currentTimeMillis().toInt(), notification)
}
}
}
添加权限
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
配置service
<service
android:name=".service.KeepAliveService"
android:enabled="true"
android:exported="false"
android:foregroundServiceType="connectedDevice|dataSync" />
启动服务
// 启动前台保活服务
KeepAliveService.start(this)
KeepAliveService.showAlarmNotification(
this@CottonApplication,
"",
""
)
进阶保活方案
开机自启
<receiver android:name=".receiver.BootReceiver" android:enabled="true" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
class BootReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
if (intent.action == Intent.ACTION_BOOT_COMPLETED) {
val serviceIntent = Intent(context, MqttForegroundService::class.java)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(serviceIntent)
} else {
context.startService(serviceIntent)
}
}
}
}
自恢复（守护）
可以每隔一段时间用 WorkManager 检查服务是否存活。
若服务被杀死则自动重启。
应用白名单
提醒用户在系统设置中“电池优化”里将你的应用加入白名单。
例如华为/小米设备，可在首次启动时引导用户开启。
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