[android-developers] Can't properly stop a thread

In my application I am connecting to a server and downloading some
things. Not much but the connection it self takes a while. Off course
this is done in a thread (class that implements runnable). If some
error occurs, the thread sends a message to the UI using a Handler and
the UI displays an dialog window.

My problem is that I can't stop the thread in the UI properly. For
example if during the connection I would press the 'home' button on
the phone, after some seconds I get an error saying that my
application couldn't create a dialog window (because it is not running
anymore). That means that my thread was not stopped and kept on
working until an error (i.e. timeout) occurred and tried to send a
massege to the UI by a handler.

to Stop the thread I have a function that I found:

public synchronized Thread stopThread(Thread thr){
if(thr != null){
Thread temp = thr;
thr = null;
temp.interrupt();
}
return thr;
}

And I use it like:

@Override
public void onDestroy()
{
super.onDestroy();
senderTh= stopThread(senderTh);
finish();
}

Why this doesn't stop my Thread? How can I do it from the UI?

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