我創建了一個片段，我想通過 editText 欄位在其中插入數字以用作在另一個類中創建的函式中的引數（NavFun 類的函式 createPath）。我創建的 NavFun 類有一個建構式，它接受兩個變數，main_activity 的背景關系和一個 mapView。單擊片段中的按鈕后，我想呼叫 createPath 函式。
如何在片段中獲取 main_activity 和 mapView 的背景關系以創建 navFun 的實體？
我想在片段下面做這樣的事情，但我不明白如何獲取背景關系和 mapView
val navFun: NavFun = NavFun(context, mapView)
navFun.routePath(p1lati, p1long, p2lati, p2long)
navFun.mapView.invalidate()
這是我的片段體：
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"
/**
* A simple [Fragment] subclass.
* Use the [CreatePathFragment.newInstance] factory method to
* create an instance of this fragment.
*/
class CreatePathFragment : Fragment() {
private var param1: String? = null
private var param2: String? = null
private lateinit var editTextLatitudineP1: EditText
private lateinit var editTextLongitudineP1: EditText
private lateinit var editTextLatitudineP2: EditText
private lateinit var editTextLongitudineP2: EditText
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
val view: View = inflater.inflate(R.layout.fragment_create_path, container, false)
// create path between editText points
editTextLatitudineP1 = view.findViewById<EditText>(R.id.editTextLatitudineP1)
editTextLongitudineP1 = view.findViewById<EditText>(R.id.editTextLongitudineP1)
editTextLatitudineP2 = view.findViewById<EditText>(R.id.editTextLatitudineP2)
editTextLongitudineP2 = view.findViewById<EditText>(R.id.editTextLongitudineP2)
val b = view.findViewById<Button>(R.id.location)
b.setOnClickListener{
try {
Log.d("Clicked", "Clicked")
val p1lati: Double = editTextLatitudineP1.text.toString().toDouble()
val p1long: Double = editTextLongitudineP1.text.toString().toDouble()
val p2lati: Double = editTextLatitudineP2.text.toString().toDouble()
val p2long: Double = editTextLongitudineP2.text.toString().toDouble()
println("latitudine p1: $p1lati, longitudine p1: $p1long")
println("latitudine p2: $p2lati, longitudine p2: $p2long")
navFun.routePath(p1lati, p1long, p2lati, p2long)
navFun.mapView.invalidate()
} catch (e: Exception) {
Toast.makeText(this, "Error", Toast.LENGTH_SHORT).show()
}
}
// Inflate the layout for this fragment
return view
}
companion object {
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment CreatePathFragment.
*/
@JvmStatic
fun newInstance(param1: String, param2: String) =
CreatePathFragment().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
這是我的 navFun 課程：
class NavFun(private val context: Context, private val mapView: MapView) {
private lateinit var road: Road
val context1: Context = context
val mapView1: MapView = mapView
// function to create path between two points
fun routePath(p1Latit: Double, p1Laong: Double, p2Latit: Double, p2Laong: Double){
println("inizio")
val roadManager: RoadManager = OSRMRoadManager(context, "lolloMaps")
OSRMRoadManager.MEAN_BY_FOOT
println("passo1 - creoArrayList")
val waypoints = arrayListOf<GeoPoint>()
println("passo2 - CreoPuntiEAggiungoInArrayList")
val startPoint: GeoPoint = GeoPoint(p1Latit, p1Laong) //43.12628, 12.04705
waypoints.add(startPoint)
val endPoint: GeoPoint = GeoPoint(p2Latit, p2Laong) //43.12124, 11.97211
waypoints.add(endPoint)
println("passo3 - CreoStrada")
road = roadManager.getRoad(waypoints)
if (road.mStatus != Road.STATUS_OK){
Toast.makeText(context, "Errore nel caricamento di road - status = " road.mStatus, Toast.LENGTH_SHORT).show()
}
println("passo4 - CreoPolilinea")
val roadOverlay: Polyline = RoadManager.buildRoadOverlay(road)
println("passo5 - AggiungoPolilineaAllaMappa")
mapView.overlays.add(roadOverlay)
mapView.invalidate()
// create checkpoints along the route
val nodeIcon: Drawable? = ResourcesCompat.getDrawable(mapView.resources, R.drawable.marker_node, null)
for (i: Int in road.mNodes.indices){
val node: RoadNode = road.mNodes[i]
val nodeMarker: Marker = Marker(mapView)
nodeMarker.position = node.mLocation
nodeMarker.icon = nodeIcon
nodeMarker.title = "Passo $i"
mapView.overlays.add(nodeMarker)
// add information in checkpoint windows
nodeMarker.snippet = node.mInstructions
nodeMarker.subDescription = Road.getLengthDurationText(context,node.mLength, node.mDuration)
// var icon: Drawable = resources.getDrawable(R.drawable.ic_continue)
// nodeMarker.image = icon
}
}
// function to add Marker
private fun mioMarker(lati: Double, longi: Double, i: Int) {
val pinMarker = Marker(mapView)
val geoPoint = GeoPoint(lati, longi)
pinMarker.position = geoPoint
pinMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER)
pinMarker.title = "Title"
pinMarker.subDescription = "io sono il pin #$i con coordinate $lati, $longi."
pinMarker.isDraggable = true
mapView.overlays.add(pinMarker)
mapView.invalidate()
}
}
這是我的主要活動：
class MainActivity : AppCompatActivity() {
private var backPressedTime = 0L
private lateinit var toggle: ActionBarDrawerToggle
private lateinit var drawerLayout: DrawerLayout
private lateinit var mapView : MapView
private lateinit var myLocationNewOverlay: MyLocationNewOverlay
private lateinit var compassOverlay: CompassOverlay
private lateinit var mapController: IMapController
override fun onCreate(savedInstanceState: Bundle?) {
// disabilita la policy di strictMode nella onCreate per non fare chiamate network in async tasks
val policy: StrictMode.ThreadPolicy = StrictMode.ThreadPolicy.Builder().permitAll().build()
StrictMode.setThreadPolicy(policy)
super.onCreate(savedInstanceState)
//richiesta per gestire i permessi
requestPermission()
// inizializza la configurazione di osmdroid, non funziona se non si importa org.osmdroid.config.Configuration.*
getInstance().load(this, PreferenceManager.getDefaultSharedPreferences(this))
//crea la mappa
setContentView(R.layout.activity_main)
mapView = findViewById<MapView>(R.id.map)
mapView.setTileSource(TileSourceFactory.MAPNIK)
mapView.zoomController.setVisibility(CustomZoomButtonsController.Visibility.NEVER)
// crea MapController e setta posizione iniziale
mapController = mapView.controller
// crea overlay posizione
myLocationNewOverlay = MyLocationNewOverlay(GpsMyLocationProvider(this), mapView)
myLocationNewOverlay.enableMyLocation()
myLocationNewOverlay.enableMyLocation()
myLocationNewOverlay.isDrawAccuracyEnabled = true
myLocationNewOverlay.runOnFirstFix { runOnUiThread {
mapController.animateTo(myLocationNewOverlay.myLocation)
mapController.setZoom(9.0)
}
}
mapView.overlays.add(myLocationNewOverlay)
//set user agent
Configuration.getInstance().userAgentValue = "lolloMaps"
// controllo
println(myLocationNewOverlay.myLocation)
println("creato")
// attiva bussola, Non Funziona!
compassOverlay = CompassOverlay(this, InternalCompassOrientationProvider(this), mapView)
compassOverlay.enableCompass()
mapView.overlays.add(compassOverlay)
// attivare griglia latitudine e longitudine
// val overlay = LatLonGridlineOverlay2()
// mapView.overlays.add(overlay)
// abilita gesture rotazione e zoom
val rotationGestureOverlay = RotationGestureOverlay(mapView)
rotationGestureOverlay.isEnabled
mapView.setMultiTouchControls(true)
mapView.overlays.add(rotationGestureOverlay)
// abilita mia posizione
myLocationNewOverlay = MyLocationNewOverlay(GpsMyLocationProvider(this), mapView)
myLocationNewOverlay.enableMyLocation()
mapView.overlays.add(myLocationNewOverlay)
// abilita overlay scala
val dm : DisplayMetrics = resources.displayMetrics
val scaleBarOverlay = ScaleBarOverlay(mapView)
scaleBarOverlay.setCentred(true)
scaleBarOverlay.setScaleBarOffset(dm.widthPixels / 2, 10)
mapView.overlays.add(scaleBarOverlay)
// abilita comandi sulla mappa, single tap e long press
val mapEventsReceiver: MapEventsReceiverImpl = MapEventsReceiverImpl()
val mapEventsOverlay: MapEventsOverlay = MapEventsOverlay(mapEventsReceiver)
mapView.overlays.add(mapEventsOverlay)
//--------------------------------------------------------------------------------------------
// codice per menu laterale
drawerLayout = findViewById(R.id.drawerLayout)
val navView: NavigationView = findViewById(R.id.nav_view)
toggle = ActionBarDrawerToggle(this, drawerLayout, R.string.open, R.string.close)
drawerLayout.addDrawerListener(toggle)
toggle.syncState()
supportActionBar?.setDisplayHomeAsUpEnabled(true)
navView.setNavigationItemSelectedListener {
it.isChecked = true
when(it.itemId){
R.id.nav_create_path -> {
Toast.makeText(applicationContext, "Clicked Crea Percorso", Toast.LENGTH_SHORT).show()
replaceFreagment(CreatePathFragment(), it.title.toString())
}
R.id.nav_saved_paths -> {
Toast.makeText(applicationContext, "Clicked Percorsi Salvati", Toast.LENGTH_SHORT).show()
replaceFreagment(SavedPathsFragment(), it.title.toString())
}
R.id.nav_center_map -> { Toast.makeText(applicationContext, "Clicked Centra Mappa", Toast.LENGTH_SHORT).show()
myLocationNewOverlay.runOnFirstFix {
runOnUiThread {
mapController.animateTo(myLocationNewOverlay.myLocation)
mapController.setZoom(9.0)
}
}
}
R.id.nav_trash -> Toast.makeText(applicationContext, "Clicked Pulisci Mappa", Toast.LENGTH_SHORT).show()
R.id.nav_settings -> Toast.makeText(applicationContext, "Clicked Impostazioni", Toast.LENGTH_SHORT).show()
R.id.nav_share -> Toast.makeText(applicationContext, "Clicked Condividi", Toast.LENGTH_SHORT).show()
R.id.nav_contact_us -> Toast.makeText(applicationContext, "Clicked Contattaci", Toast.LENGTH_SHORT).show()
R.id.nav_exit -> Toast.makeText(applicationContext, "Clicked Esci", Toast.LENGTH_SHORT).show()
}
true
}
}
override fun onResume() {
super.onResume()
mapView.onResume()
}
override fun onPause() {
super.onPause()
mapView.onPause()
}
//funzione per controllare se ho i permessi
private fun hasPermission() : Boolean {
// ritorna true quando abbiamo i permessi
return ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
}
//funzione per richiedere i permessi
private fun requestPermission() {
//aggiungo i permessi ad una lista
val permission = mutableListOf<String>()
// se non ho i permessi
if (!hasPermission()) {
// aggiungo i permesi alla lista
permission.add(Manifest.permission.ACCESS_FINE_LOCATION)
}
// concede i permessi nella lista
if (permission.isNotEmpty()) {
ActivityCompat.requestPermissions(this, permission.toTypedArray(), 0)
}
}
// fragments function
private fun replaceFreagment(fragment: Fragment, title: String) {
val fragmentManager: FragmentManager = supportFragmentManager
val fragmentTransaction: FragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.replace(R.id.frameLayout, fragment)
fragmentTransaction.addToBackStack(null).commit()
drawerLayout.closeDrawers()
setTitle(title)
}
// side menu function
override fun onOptionsItemSelected(item: MenuItem): Boolean {
if (toggle.onOptionsItemSelected(item)){
return true
}
return super.onOptionsItemSelected(item)
}
override fun onBackPressed() {
if (backPressedTime 2000 > System.currentTimeMillis()) {
super.onBackPressed()
}else{
Toast.makeText(this, "Premere ancora per tornare indietro", Toast.LENGTH_SHORT).show()
}
backPressedTime = System.currentTimeMillis()
}
}
uj5u.com熱心網友回復：
您可以通過呼叫在片段中使用背景關系： context 或 requireContext() 并且對于 MapView，您必須傳遞一個具有以下值的變數：findViewById(R.id.your_map_view_id_in_xml)
uj5u.com熱心網友回復：
我通過這樣修改它來解決它：
contextMain = activity?.baseContext!!
mapView = activity?.findViewById<MapView>(R.id.map)!!
這樣做我可以初始化 navFun 類并呼叫 createPath 函式使其作業。
轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/507361.html