multithreading - android, error when create a thread in onCreate() -


i want long operation (like copying/loading file) when application created. created thread so, thread not update ui. got error saying cannot create handler in thread without calling looper.prepare(). what's wrong code?

public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); threadfilemanager = new thread ( new runnable() { public void run() { filemanager fm = new filemanager(); fm.copyfilefromassettostorage(); } }); threadfilemanager.start(); }

edit:the error lied in filemanager class, when subclass of activity. changing service worked.

the application class wrong place this. if want, it's acceptable use application's oncreate() method start service. should implement background thread in service, purpose of service things in background. application class should seldom used. it's last resort maintaining minimal amounts of global state.

once move code service, looper.prepare() have been called android.

edit:

op trying create handler inside of thread when invoked constructor of filemanager class. while comment above still true, not relevant op's question subclassing activity , not application.

to clear, actual problem was creating handler inside thread had not yet called looper.prepare() (via new filemanager()). correct fix create handler on main thread, i.e. in 1 of activity or service callbacks.


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