Added SingleSat selection dialog. Setting up the WorldMapFragment for future track drawing feature.

app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt

@@ -58,6 +58,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
 
     var tleMainList = loadTwoLineElementFile()
     var tleSelectedMap = mutableMapOf<TLE, Boolean>()
+    var selectedSingleSat = tleMainList[0]
     var passPrefs = SatPassPrefs(
         preferences.getInt(keyHours, 8),
         preferences.getDouble(keyMaxEl, 16.0)
@@ -73,6 +74,10 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         }
     }
 
+    fun updateSelectedSingleSat(sat: TLE) {
+        selectedSingleSat = sat
+    }
+
     suspend fun getPasses() {
         val passList = mutableListOf<SatPass>()
         withContext(Dispatchers.Default) {

app/src/main/java/com/rtbishop/lookingsat/ui/SkyFragment.kt

@@ -100,7 +100,7 @@ class SkyFragment : Fragment() {
     }
 
     private fun showSelectSatDialog() {
-        val tleMainList: List<TLE> = viewModel.tleMainList
+        val tleMainList = viewModel.tleMainList
         val tleNameArray = arrayOfNulls<String>(tleMainList.size)
         val tleCheckedArray = BooleanArray(tleMainList.size)
         val selectedSatMap = viewModel.tleSelectedMap

app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt

@@ -1,14 +1,41 @@
 package com.rtbishop.lookingsat.ui
 
+import android.content.Context
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.FrameLayout
+import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import com.github.amsacode.predict4java.PassPredictor
+import com.github.amsacode.predict4java.TLE
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+import com.rtbishop.lookingsat.MainViewModel
 import com.rtbishop.lookingsat.R
+import kotlinx.coroutines.launch
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
 
 class WorldMapFragment : Fragment() {
 
+    private val delay = 3000L
+    private val service = Executors.newSingleThreadScheduledExecutor()
+
+    private lateinit var viewModel: MainViewModel
+    private lateinit var trackView: TrackView
+    private lateinit var mapFrame: FrameLayout
+    private lateinit var fab: FloatingActionButton
+    private lateinit var selectedSat: TLE
+    private lateinit var predictor: PassPredictor
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        viewModel = ViewModelProvider(activity as MainActivity).get(MainViewModel::class.java)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -16,4 +43,47 @@ class WorldMapFragment : Fragment() {
     ): View? {
         return inflater.inflate(R.layout.fragment_worldmap, container, false)
     }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        mapFrame = view.findViewById(R.id.worldmap_frame)
+        fab = view.findViewById(R.id.worldmap_fab)
+        fab.setOnClickListener { showSelectSatDialog() }
+
+        selectedSat = viewModel.selectedSingleSat
+        lifecycleScope.launch {
+            predictor = PassPredictor(selectedSat, viewModel.gsp.value)
+        }
+
+        trackView = TrackView(activity as MainActivity)
+        mapFrame.addView(trackView)
+
+        service.scheduleAtFixedRate({ trackView.invalidate() }, delay, delay, TimeUnit.MILLISECONDS)
+    }
+
+    private fun showSelectSatDialog() {
+        val tleMainList = viewModel.tleMainList
+        val tleNameArray = arrayOfNulls<String>(tleMainList.size)
+        var selection = viewModel.selectedSingleSat
+
+        tleMainList.withIndex().forEach { (position, tle) ->
+            tleNameArray[position] = tle.name
+        }
+
+        val builder = AlertDialog.Builder(activity as MainActivity)
+        builder.setTitle("Select Sat to track")
+            .setSingleChoiceItems(tleNameArray, -1) { _, which ->
+                selection = tleMainList[which]
+            }
+            .setPositiveButton("Ok") { _, _ ->
+                viewModel.updateSelectedSingleSat(selection)
+            }
+            .setNegativeButton("Cancel") { dialog, _ ->
+                dialog.cancel()
+            }
+            .create()
+            .show()
+    }
+
+    inner class TrackView(context: Context) : View(context)
 }