Android 如何使用Firebase JobDispatcher进行nv websocket客户端的异步重新连接?
在Android应用程序中(使用Android 如何使用Firebase JobDispatcher进行nv websocket客户端的异步重新连接?,android,firebase,websocket,android-jobscheduler,firebase-job-dispatcher,Android,Firebase,Websocket,Android Jobscheduler,Firebase Job Dispatcher,在Android应用程序中(使用MinsdkVersion16),我使用库: 在AndroidManifest.xml中,我有: <service android:name=".MainActivity$ReconnectService" android:exported="false"> <intent-filter> <action android:name="com.firebase.jobdispatcher.ACTI
MinsdkVersion16
),我使用库:
在AndroidManifest.xml中,我有:
<service
android:name=".MainActivity$ReconnectService"
android:exported="false">
<intent-filter>
<action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
</intent-filter>
</service>
有人知道这里出了什么问题吗
我还将我的问题提交为。将
重新连接服务
放在它自己的类中(不是MainActivity
的内部类)。或者,尝试使内部类静态
Java中非静态内部类的工作方式是,它们只能由外部类的实例实例化。这就是允许内部类的实例访问外部类的成员的原因。所以,当Android试图创建内部类的实例时,它不能这样做,因为它不知道外部类的哪个实例应该是它的一部分。错误消息有点误导。谢谢Doug(+1)周日的回复!),但是如果我将内部类更改为static
,那么我就无法再访问mWs
、mWsFactory
和mWsListener
。如何解决这个问题?另外,我也很困惑,如果调用mWs.connectAsynchronously()
并因此(重新)使用另一个线程后,我应该通过onStartJob()
返回true
。是的,这不是Android中服务的工作方式。他们有自己完全独立于活动的背景。他们应该以这种方式保持孤立。考虑重新构造代码,以便在活动本身内不管理WebSoT,或者查看另一种方式来重新连接服务(例如,带有调度消息的处理程序)。
private FirebaseJobDispatcher mReconnectDispatcher;
public class ReconnectService extends JobService {
@Override
public boolean onStartJob(JobParameters job) {
try {
mWs = mWsFactory.createSocket("ws://demos.kaazing.com/echo");
mWs.addListener(mWsListener);
mWs.connectAsynchronously(); // uses background thread
} catch (Exception ex) {
Log.w(TAG, "Can not create WebSocket connection", ex);
}
return true; // Answers the question: "Is there still work going on?"
}
@Override
public boolean onStopJob(JobParameters job) {
return false; // Answers the question: "Should this job be retried?"
}
}
private void reconnect() {
Job myJob = mReconnectDispatcher.newJobBuilder()
.setService(ReconnectService.class)
.setTag(ReconnectService.class.getSimpleName())
.setRecurring(false)
.setLifetime(Lifetime.UNTIL_NEXT_BOOT)
.setTrigger(Trigger.executionWindow(0, 60))
.setReplaceCurrent(true)
.setConstraints(Constraint.ON_ANY_NETWORK)
.build();
mReconnectDispatcher.mustSchedule(myJob);
}
<service
android:name=".MainActivity$ReconnectService"
android:exported="false">
<intent-filter>
<action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
</intent-filter>
</service>
16998-16998/de.slova E/AndroidRuntime: FATAL EXCEPTION: main
Process: de.slova, PID: 16998
java.lang.RuntimeException: Unable to instantiate service de.slova.MainActivity$ReconnectService: java.lang.InstantiationException: java.lang.Class<de.slova.MainActivity$ReconnectService> has no zero argument constructor
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3389)
at android.app.ActivityThread.-wrap4(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.InstantiationException: java.lang.Class<de.slova.MainActivity$ReconnectService> has no zero argument constructor
at java.lang.Class.newInstance(Native Method)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3386)
at android.app.ActivityThread.-wrap4(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
1472-1487/? I/ActivityManager: Showing crash dialog for package de.slova u0
public class ReconnectService extends JobService {
public ReconnectService() {
}