Created
August 19, 2017 13:36
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| package em.zed.literallynothing | |
| import android.os.Bundle | |
| import android.support.v7.app.AppCompatActivity | |
| import android.support.v7.widget.LinearLayoutManager | |
| import android.support.v7.widget.RecyclerView | |
| import android.view.LayoutInflater | |
| import android.view.View | |
| import android.view.ViewGroup | |
| import android.widget.ProgressBar | |
| import android.widget.TextView | |
| import kotlinx.coroutines.experimental.* | |
| import kotlinx.coroutines.experimental.android.UI | |
| import kotlinx.coroutines.experimental.channels.BroadcastChannel | |
| import kotlinx.coroutines.experimental.channels.Channel | |
| import kotlinx.coroutines.experimental.channels.SendChannel | |
| typealias Action<T> = T.() -> Unit | |
| fun fetchItems(view: SendChannel<Action<MainActivity>>) = launch(CommonPool) { | |
| view.send { spin(true) } | |
| delay(10_000) | |
| val items = listOf("foo", "bar", "baz", "quux") | |
| view.send { | |
| spin(false) | |
| (rv.adapter as MyAdapter).let { | |
| it.items = items | |
| it.notifyDataSetChanged() | |
| } | |
| } | |
| } | |
| class Scope { | |
| val actions = BroadcastChannel<Action<MainActivity>>(Channel.CONFLATED) | |
| init { | |
| fetchItems(actions) | |
| } | |
| } | |
| class MainActivity : AppCompatActivity() { | |
| internal lateinit var rv: RecyclerView | |
| internal lateinit var spinner: ProgressBar | |
| private lateinit var our: Scope | |
| private lateinit var loop: Job | |
| override fun onRetainCustomNonConfigurationInstance(): Any = our | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| our = lastCustomNonConfigurationInstance as? Scope ?: Scope() | |
| super.onCreate(savedInstanceState) | |
| setContentView(R.layout.activity_main) | |
| rv = findViewById(R.id.the_list) as RecyclerView | |
| rv.adapter = MyAdapter() | |
| rv.layoutManager = LinearLayoutManager(this) | |
| spinner = findViewById(R.id.the_spinner) as ProgressBar | |
| } | |
| override fun onResume() { | |
| super.onResume() | |
| loop = launch(UI) { | |
| our.actions.open().use { | |
| for (action in it) action() | |
| } | |
| } | |
| } | |
| override fun onPause() { | |
| super.onPause() | |
| loop.cancel(CancellationException("activity paused.")) | |
| } | |
| internal fun spin(busy: Boolean) { | |
| if (busy) { | |
| rv.visibility = View.GONE | |
| spinner.visibility = View.VISIBLE | |
| } else { | |
| rv.visibility = View.VISIBLE | |
| spinner.visibility = View.GONE | |
| } | |
| } | |
| } | |
| class MyAdapter : RecyclerView.Adapter<MyViewHolder>() { | |
| internal var items: List<String> = listOf() | |
| override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = LayoutInflater | |
| .from(parent.context) | |
| .inflate(android.R.layout.simple_selectable_list_item, parent, false) | |
| .let(::MyViewHolder) | |
| override fun onBindViewHolder(holder: MyViewHolder, position: Int) { | |
| holder.label.text = items[position] | |
| } | |
| override fun getItemCount() = items.size | |
| } | |
| class MyViewHolder(root: View) : RecyclerView.ViewHolder(root) { | |
| internal val label = root as TextView | |
| } |
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