Android - Basic Steps (Thread)

Thread

UI Thread - Is the main thread
UI Toolkit is not thread-safe

Methods

The following methods allows to run in the UI Thread

View.post(Runnable r)
Activity.runOnUiThread(Runnable r)

AsyncTask

Manage the Backgroud Thread & UI Thread
Used for relative short tasks that lasting few seconds

Background Thread

Performs work
Indicate progress

UI Thread

Does Setup
Publishes intermediate progress
Uses Results

Workflow

onPreExecute()

Run in UI Thread before doInBackground()
Do the setup

doInBackground()

Do the work in the background
Return the result in a Result object

pulishProgress()

This method may be invoked

onProgressUpdate()

If pulishProgress() is invoked then this method continue
Runs in the UI Thread

onPostExecute

Runs after doInBackground()

Handler

Handle two threads of any kind
One thread can hand off work to another thread by messages & posting runnables to handler associated with the second thread

Elements

Runnable

Contains an instance of the Runnable instance
Sender implements response

Message

Contains

Message code
Object & Integer arguments

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