Asynctask and Adapter for Listview in conflict

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I’m creating a chat app using socket and after developing all the layout I decided to enter the connection part... the problem is that when I receive messages the app closes and presents some errors... I passed in debug and tells me that both my Adapter and my listview are null. I’m new in android and java.

follows a piece of error (line 224 is where adapterMessage.add(message)

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.stevenilson.appchat, PID: 26141
java.lang.RuntimeException: An error occured while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:304)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void adapters.MessageAdapter.add(objetos.Message)' on a null object reference
    at com.stevenilson.appchat.TelaDrawer.receive(TelaDrawer.java:224)
    at AsyncTask.TaskConnect.doInBackground(TaskConnect.java:80)
    at AsyncTask.TaskConnect.doInBackground(TaskConnect.java:26)
    at android.os.AsyncTask$2.call(AsyncTask.java:292)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
    at java.lang.Thread.run(Thread.java:818) 

In case you need to see more of the project I have it on Github: https://github.com/LucasGitDev/AppChat

I thank from now on those who can help me.

android nullpointerexception android-adapter asynctask

1 answer

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Well, your mistake doesn’t seem to be any kind of conflict between Asynctask and Adapter. From what I saw the error happened in the background yes, but because you tried to access a null object, in the case, the Messageadapter is null.

Caused by: java.lang.Nullpointerexception: Attempt to invoke virtual method 'void Adapters.MessageAdapter.add(objects.Message)' on a null Object Reference

Make sure you get it started right, maybe that’s the problem.

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