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Improvement for deferred configuration
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97
demo/src/main/java/com/peterlaurence/mapview/demo/fragments/DeferredFragment.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,97 @@ | ||
| package com.peterlaurence.mapview.demo.fragments | ||
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| import android.os.Bundle | ||
| import android.view.LayoutInflater | ||
| import android.view.View | ||
| import android.view.ViewGroup | ||
| import androidx.fragment.app.Fragment | ||
| import com.peterlaurence.mapview.MapView | ||
| import com.peterlaurence.mapview.MapViewConfiguration | ||
| import com.peterlaurence.mapview.core.TileStreamProvider | ||
| import com.peterlaurence.mapview.demo.R | ||
| import kotlinx.coroutines.* | ||
| import java.io.InputStream | ||
| import kotlin.coroutines.CoroutineContext | ||
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| /** | ||
| * An example showing deferred configuration of [MapView]. In this example, a [MapView] is first | ||
| * added to the view hierarchy, then a few moment later it's configured. | ||
| * | ||
| * It demonstrates that the [MapView] configuration can be done later (when all necessary data is | ||
| * gathered). It's important since the Android framework requires a view to be added inside the | ||
| * [onCreateView] lifecycle callback to have its state saved and restored upon device rotation. | ||
| * But inside [onCreateView] we may not have (yet) all information needed to call [MapView.configure]. | ||
| */ | ||
| class DeferredFragment : Fragment(), CoroutineScope { | ||
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| private lateinit var mapView: MapView | ||
| private lateinit var parentView: ViewGroup | ||
| private var job: Job? = null | ||
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| override val coroutineContext: CoroutineContext | ||
| get() = Dispatchers.Main + Job().also { job = it } | ||
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| /** | ||
| * The [MapView] should always be added inside [onCreateView], to ensure state save/restore. | ||
| */ | ||
| override fun onCreateView( | ||
| inflater: LayoutInflater, | ||
| container: ViewGroup?, | ||
| savedInstanceState: Bundle? | ||
| ): View? { | ||
| return inflater.inflate(R.layout.fragment_layout, container, false).also { | ||
| parentView = it as ViewGroup | ||
| context?.let { ctx -> | ||
| MapView(ctx).addToFragment() | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Assign an id the the [MapView] (it's necessary to enable state save/restore). | ||
| * And keep a ref on the [MapView] | ||
| */ | ||
| private fun MapView.addToFragment() { | ||
| this@DeferredFragment.mapView = this | ||
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| mapView.id = R.id.mapview_id | ||
| mapView.isSaveEnabled = true | ||
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| parentView.addView(mapView, 0) | ||
| } | ||
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| /** | ||
| * In this example, the configuration isn't done **immediately** after the [MapView] is added to | ||
| * the view hierarchy, in [onCreateView]. It's done in [onStart]. | ||
| * But it's not mandatory, it could have been done right after the [MapView] creation. | ||
| */ | ||
| override fun onStart() { | ||
| super.onStart() | ||
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| val tileStreamProvider = object : TileStreamProvider { | ||
| override fun getTileStream(row: Int, col: Int, zoomLvl: Int): InputStream? { | ||
| return try { | ||
| context?.assets?.open("tiles/esp/$zoomLvl/$row/$col.jpg") | ||
| } catch (e: Exception) { | ||
| null | ||
| } | ||
| } | ||
| } | ||
| val tileSize = 256 | ||
| val config = MapViewConfiguration( | ||
| 5, 8192, 8192, tileSize, tileStreamProvider | ||
| ).setMaxScale(2f).setPadding(tileSize * 2) | ||
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| launch { | ||
| delay(500) // simulate delay | ||
| mapView.configure(config) | ||
| } | ||
| } | ||
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| override fun onStop() { | ||
| super.onStop() | ||
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| job?.cancel() | ||
| } | ||
| } |
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