Android 工作管理器与服务

Android 工作管理器与服务

kotlin
// 定义下载任务的工作
class DownloadWorker(context: Context, workerParams: WorkerParameters) : Worker(context, workerParams) {
    override fun doWork(): Result {
        // 下载文件的逻辑
        // ...
        return Result.success()
    }
}
// 启动工作管理器
fun startDownloadWork(context: Context) {
    val constraints = Constraints.Builder()
        .setRequiredNetworkType(NetworkType.UNMETERED)
        .setRequiresCharging(true)
        .build()
    val downloadRequest = OneTimeWorkRequestBuilder()
        .setConstraints(constraints)
        .build()
    WorkManager.getInstance(context).enqueue(downloadRequest)
}
// 定义后台服务
class DownloadService : Service() {
    override fun onBind(intent: Intent): IBinder? {
        return null
    }
    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        // 启动下载任务
        startDownloadWork(applicationContext)
        // 返回 START_STICKY 让服务在被销毁后重新启动
        return START_STICKY
    }
}