ANDROID THREADING MODEL

Android follow a particular threadin model that can be divided in 2 levels, at the kernel level application are executed in different Dalvik VM’s and the application is composed by a single java thread that runs the activities

flowchart LR
subgraph linux kernel
direction LR
subgraph app1
A[dalvik VM]
end
subgraph app2
B[dalvik VM]
end
app1 ~~~ app2
end

the main thread of the application executes the following looper

while(true){
	Message = m.queue.next();
	if(m!=null){
		m.target.dispatch-message(m);
		m.recycle();
	}
}

ANDROID THREAD GROUPS

Android defines different group threads with different scheduling priorities

• foreground
• visible
• service
• background

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