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    <blockquote> <p>Is above statement true or false?</p> </blockquote> <p>No object "runs" on a thread, anywhere in Java. <em>Methods</em> run on threads.</p> <p>Hence, a more accurate statement is that the lifecycle methods on <code>Service</code> -- <code>onCreate()</code>, <code>onStartCommand()</code>, <code>onBind()</code>, and <code>onDestroy()</code> -- are called on the main application thread.</p> <blockquote> <p>Can someone explain this statement from android reference for Service</p> </blockquote> <p>I don't know how to explain that much better than it is written. While a <code>Service</code> <em>can manage</em> a background thread, a <code>Service</code> is not <em>itself</em> a <code>Thread</code>.</p> <blockquote> <p>If service runs in UI thread then it is not suitable for heavy work</p> </blockquote> <p>No object "runs" on a thread, anywhere in Java. <em>Methods</em> run on threads.</p> <p>Hence, a more accurate statement is that you should not take much time in work directly triggered by the aforementioned lifecycle methods.</p> <blockquote> <p>If there is no activity running then in which thread service will be running?</p> </blockquote> <p>No object "runs" on a thread, anywhere in Java. <em>Methods</em> run on threads.</p> <p>The aforementioned lifecycle methods are called on the main application thread, regardless of whether or not there is an activity in the foreground, or even if an activity exists.</p> <blockquote> <p>Then If I declare Handler in service as well as activity what would happen?</p> </blockquote> <p>You would have an instance of <code>Handler</code>.</p> <blockquote> <p>Because a single Thread has one instance of Handler</p> </blockquote> <p>The default behavior of <code>Handler</code> is to tie itself to the main application thread, no matter whether you create a <code>Handler</code> in an <code>Activity</code> or a <code>Service</code>.</p>
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    1. POAre Activity and Service running in the same thread?
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    1. COso if my service start a thread and i want a communication channel like this: Thread can send data to service and service can send data to activity. if the service and activity handlers are bound with the application handler then which handler will receive the message if thread sends a message to service?
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      1. USKanwar Saad
    2. CO@KanwarSaad: The message will go to the `Handler` on which you called `sendMessage()`.
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    3. COIm verifying your statement right now .. thanks
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