Problems with GlobalScope
When we use coroutines in Activity or Fragment, we should try to avoid using them GlobalScope.
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
GlobalScope.launch {
val data = withContext(Dispatchers.IO) {
loadData()
}
initUi(data)
}
}
...
}
GlobalScopeThe life cycle is at the process level, so in the above example, even if the Activity or Fragment has been destroyed, the coroutine is still executing.
Solution
Use androidx.lifecycle:lifecycle-runtime-ktx:2.2.0-alpha01or higher version, will use LifecycleScopeinsteadGlobalScope
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
lifecycleScope.launch {
val data = withContext(Dispatchers.IO) {
loadData()
}
initUi(data)
}
}
...
}
class MyFragment: Fragment() {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
viewLifecycleOwner.lifecycleScope.launch {
val data = withContext(Dispatchers.IO) {
loadData()
}
initUi(data)
}
}
...
}
Refer to https://developer.android.com/topic/libraries/architecture/coroutines