Serialized Intent Extras seem empty after starting new Activity

Question

So i've benn working on App which needs a BlockingQueue to communicate between the UI Thread and a handler thread. So i createt a LinkedBlockingQueue and the Thread in the onCreate of my first Activity.

BlockingQueue<String> UIqueueRx = new LinkedBlockingDeque<String>();
BlockingQueue<String> UIqueueTx = new LinkedBlockingDeque<String>();

final main m = new main(UIqueueRx,UIqueueTx);
Thread myMainThread = new Thread(m);
myMainThread.setName("AdapterThread");
myMainThread.start();

I need the BlockingQueue also during the next Actyvities, so put them into the Intent.putExtra and startet next Activity.

Intent myIntent = new Intent(v.getContext(),Start.class);
myIntent.putExtra("UIqueueRx",(Serializable) UIqueueRx);
myIntent.putExtra("UIqueueTx",(Serializable) UIqueueTx);
startActivity(myIntent);

So in my new Actyvity i wanted to take the BlockingQueue fron the Intent and bind it to my local class.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_start);
    BlockingQueue<String> UIqueueRx = (BlockingQueue<String>) getIntent().getSerializableExtra("UIqueueRx");
    BlockingQueue<String> UIqueueTx = (BlockingQueue<String>) getIntent().getSerializableExtra("UIqueueTx");
    //...
}

But if i later use the Queue to send Strings to the Thread nothing hapens, the String stays in Queue. So i tried to debug and mentions the id number of the Queues changed so they arent connected anymore. I also checked the Intent itself, after open the new activity there are no Extras anymore.

Anyone mention a mistake i overlooked? Is this kind of code even rational or is there a spimler way?

Answer 1

The onCreate() method only gets called once when the Activity is created. If its paused, resumed or restarted later on it skips the onCreate Method.

If you want to persist the Extras from the Intent, you should use class fields.