AsyncTask and Adapter for conflicting ListView

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AsyncTask and Adapter for conflicting ListView

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I'm creating a chat app using socket and after developing the entire layout I decided to get into the connection part ... the problem is that when I get messages the app closes and it shows some errors ... I went through the debug and it tells me so much my adapter and my listview are null. I'm new to android and java.

follows a bit 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)

If you need to see more of the project I have it in GitHub: link

Thank you in advance for anyone who can help me.

android nullpointerexception android-adapter asynctask

asked by anonymous 17.11.2018 / 13:43

1 answer

Not all paths return value Login and authentication in Laravel 5.7

score 0 · Answer 1

Well, your error does not appear to be any type of conflict between AsyncTask and the adapter. From what I saw the error happened in the background yes, but because you tried to access a null object, in this 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've initialized it right, that might be the problem.