我有一个每 15 分钟运行一次的定期任务。
保护应用程序时。如果应用程序从后台被杀死,工作管理器将无法工作。
测试设备:一加7T、诺基亚5+、谷歌pixel 2 Emulator
只有当应用程序处于前台或后台时,工作管理器才会被执行。
禁用 proguard 工作管理器在所有 3 个条件下工作
该应用程序在前台
后台应用程序
该应用程序从后台被杀死
根据我在https://issuetracker.google.com/issues/160492142#上提出的问题
proguard 文件中可能有问题。
#noinspection ShrinkerUnresolvedReference
-keepattributes *Annotation*
-keepattributes SourceFile,LineNumberTable
# prevent Crashlytics obfuscation
-keep class com.crashlytics.** { *; }
-dontwarn com.crashlytics.**
-keep public class * extends java.lang.Exception
-keep class com.google.android.gms.measurement.AppMeasurement { *; }
###################################################################################################
# Retrofit does reflection on generic parameters. InnerClasses is required to use Signature and
# EnclosingMethod is required to use InnerClasses.
-keepattributes Signature, InnerClasses, EnclosingMethod
# Retrofit does reflection on method and parameter annotations.
-keepattributes RuntimeVisibleAnnotations, RuntimeVisibleParameterAnnotations
# Retain service method parameters when optimizing.
-keepclassmembers,allowshrinking,allowobfuscation interface * {
@retrofit2.http.* <methods>; }
-keepclassmembers,allowobfuscation class * { @com.squareup.moshi.Json <fields>; }
# Ignore annotation used for build tooling.
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
# Ignore JSR 305 annotations for embedding nullability information.
-dontwarn javax.annotation.**
# Guarded by a NoClassDefFoundError try/catch and only used when on the classpath.
-dontwarn kotlin.Unit
# Top-level functions that can only be used by Kotlin.
-dontwarn retrofit2.KotlinExtensions
-dontwarn retrofit2.KotlinExtensions$*
# With R8 full mode, it sees no subtypes of Retrofit interfaces since they are created with a Proxy
# and replaces all potential values with null. Explicitly keeping the interfaces prevents this.
-if interface * { @retrofit2.http.* <methods>; }
-keep,allowobfuscation interface <1>
# Retrofit does reflection on method and parameter annotations.
###################################################################################################
-keep class com.example.app.data.retrofit.**{ *; }
########################################OKHTTP#####################################################
# JSR 305 annotations are for embedding nullability information.
#-dontwarn javax.annotation.**
# A resource is loaded with a relative path so the package of this class must be preserved.
-keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase
# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*
# OkHttp platform used only on JVM and when Conscrypt dependency is available.
-dontwarn okhttp3.internal.platform.ConscryptPlatform
###################################################################################################
#-keepattributes Annotation
#-keepattributes Signature,RuntimeVisibleAnnotations,AnnotationDefault
#-keepattributes *Annotation*
#-keepclassmembers enum androidx.lifecycle.Lifecycle.Event {
# <fields>;
#}
#-keep !interface * implements androidx.lifecycle.LifecycleObserver {
#}
#-keep class * implements androidx.lifecycle.GeneratedAdapter {
# <init>(...);
#}
##noinspection ShrinkerUnresolvedReference
#-keepclassmembers class android.arch.** { *; }
#-keep class android.arch.** { *; }
#-dontwarn android.arch.**
implementation "androidx.work:work-runtime:2.4.0-rc01"
我已经尝试了所有版本。但同样的问题也存在。它在 Api 级别 27、28、29 中不起作用。
工作管理器在所有旧 API 级别中都能正常工作
并不意味着它仅在app 被杀死时才起作用。
当应用程序在前台和应用程序在后台时,它可以工作。
工作管理器已在应用程序类中手动初始化
public void setWorker() {
Constraints constraints = new Constraints.Builder()
.setRequiredNetworkType(NetworkType.CONNECTED)
.build();
PeriodicWorkRequest myWork =
new PeriodicWorkRequest.
Builder(AppWorker.class,
15, TimeUnit.MINUTES, 5, TimeUnit.MINUTES)
.addTag("app_periodic")
.setConstraints(constraints)
.build();
try {
WorkManager.getInstance(MyApplication.this)
.enqueueUniquePeriodicWork("app_worker_notify", ExistingPeriodicWorkPolicy.KEEP, myWork);
} catch (IllegalStateException e) {
e.printStackTrace();
}
}
示例代码
https://github.com/parmarravi/WorkManagerSample
自 2020 年 11 月 7 日起更新
关于这个问题的详细研究。