Android8.0 java.lang.IllegalStateException: Not allowed to start service Intent app is in background

报错log如下

04-16 15:48:35.662087 29891 29891 e androidruntime: java.lang.runtimeexception: unable to start receiver com.android.music.mediabuttonintentreceiver: java.lang.illegalstateexception: not allowed to start service intent { act=com.android.music.musicservicecommand cmp=com.android.music/.mediaplaybackservice (has extras) }: app is in background uid uidrecord{9ec86b u0a86 rcvr idle change:uncached procs:1 seq(0,0,0)}
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.activitythread.handlereceiver(activitythread.java:3221)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.activitythread.-wrap17(unknown source:0)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.activitythread$h.handlemessage(activitythread.java:1696)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.os.handler.dispatchmessage(handler.java:106)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.os.looper.loop(looper.java:164)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.activitythread.main(activitythread.java:6523)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at java.lang.reflect.method.invoke(native method)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at com.android.internal.os.runtimeinit$methodandargscaller.run(runtimeinit.java:438)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at com.android.internal.os.zygoteinit.main(zygoteinit.java:857)
04-16 15:48:35.662087 29891 29891 e androidruntime: caused by: java.lang.illegalstateexception: not allowed to start service intent { act=com.android.music.musicservicecommand cmp=com.android.music/.mediaplaybackservice (has extras) }: app is in background uid uidrecord{9ec86b u0a86 rcvr idle change:uncached procs:1 seq(0,0,0)}
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.contextimpl.startservicecommon(contextimpl.java:1522)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.contextimpl.startserviceasuser(contextimpl.java:1495)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.content.contextwrapper.startserviceasuser(contextwrapper.java:666)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.content.contextwrapper.startserviceasuser(contextwrapper.java:666)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at com.android.music.mediabuttonintentreceiver.onreceive(mediabuttonintentreceiver.java:209)
04-16 15:48:35.662087 29891 29891 e androidruntime:     at android.app.activitythread.handlereceiver(activitythread.java:3214)
04-16 15:48:35.662087 29891 29891 e androidruntime:     ... 8 more

网上解决方案

android 8.0 不再允许后台service直接通过startservice方式去启动， 具体行为变更如下：

如果针对 android 8.0 的应用尝试在不允许其创建后台服务的情况下使用 startservice() 函数，则该函数将引发一个 illegalstateexception。 新的 context.startforegroundservice() 函数将启动一个前台服务。现在，即使应用在后台运行， 也允许其调用 context.startforegroundservice()。不过，应用必须在创建服务后的五秒内调用该服务的 startforeground() 函数。

我们则需要 context.startservice()替换为context.startforegroundservice();
代码如下

intent i = new intent(context, mediaplaybackservice.class);
// breeze begin
//context.startserviceasuser(i, userhandle.current);
context.startforegroundserviceasuser(i, userhandle.current);
// breeze end

在mediaplaybackservice的oncreate()方法 设置为前台进程

@override
 public void oncreate() {
       super.oncreate();
       musiclogutils.v(tag, ">> oncreate");
    //wangyannan  begin
    notification status = new notification.builder(mediaplaybackservice.this,
    musicbrowseractivity.music_notification_channel).build();
    startforeground(playbackservice_status, status);
    //wangyannan  end
}

此时会报

faild to post notification  on channel ...

该原因是android8.0对notification的要求,要求每一条通知都需要具体的channel

最终解决方案

notificationmanager mnotificationmanager = (notificationmanager) getsystemservice(context.notification_service);
// notification id
final string channelid = musicbrowseractivity.music_notification_channel;
// create notification channel
 notificationchannel mchannel = new notificationchannel(channelid, "music", notificationmanager.importance_low);
 mnotificationmanager.createnotificationchannel(mchannel);
// set channel id
notification status = new notification.builder(mediaplaybackservice.this).setchannelid(channelid).build();
// start for foreground process
startforeground(playbackservice_status, status);

问题解决!!!