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I want some simple example on thread creation and invoking of threads in android.
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A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. Every thread has a priority. Threads with higher priority are executed in preference to threads with lower priority.
There're 3 types of thread: Main thread, UI thread and Worker thread. Main thread: when an application is launched, the system creates a thread of execution for the application, called main.
Working on multiple tasks at the same time is Multitasking. In the same way, multiple threads running at the same time in a machine is called Multi-Threading. Technically, a thread is a unit of a process.
When an application is launched in Android, it creates the primary thread of execution, referred to as the “main” thread. Most thread is liable for dispatching events to the acceptable interface widgets also as communicating with components from the Android UI toolkit.
This is a nice tutorial:
http://android-developers.blogspot.de/2009/05/painless-threading.html
Or this for the UI thread:
http://developer.android.com/guide/faq/commontasks.html#threading
Or here a very practical one:
http://www.androidacademy.com/1-tutorials/43-hands-on/115-threading-with-android-part1
and another one about procceses and threads
http://developer.android.com/guide/components/processes-and-threads.html
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One of Androids powerful feature is the AsyncTask class.
To work with it, you have to first extend it and override doInBackground(...). doInBackground automatically executes on a worker thread, and you can add some listeners on the UI Thread to get notified about status update, those functions are called: onPreExecute(), onPostExecute() and onProgressUpdate()
You can find a example here.
Refer to below post for other alternatives:
Handler vs AsyncTask vs Thread
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