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As i read in the android annotations for thread document
We have four types of thread,
What is differences?
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When an application is launched in Android, it creates the first thread of execution, known as the “main” thread. The main thread is responsible for dispatching events to the appropriate user interface widgets as well as communicating with components from the Android UI toolkit.
UI Thread and Main Thread are same only in Android. The Main thread, that is responsible for handling the UI events like Draw, Listen and receive the UI events. Ans also it is responsible for interact with running components of the UI toolkit for the corresponding application that belongs to.
Service : is a component of android which performs long running operation in background, mostly with out having UI. Thread : is a O.S level feature that allow you to do some operation in the background.
The "main" thread is being initialized there, and all calls to Activity lifecycle methods are being made from that exact thread. In Activity#attach() method (its source was shown above) the system initializes "ui" thread to "this" thread, which is also happens to be the "main" thread.
The differences is:
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