Map Fragment | Maps SDK | Android Docs

Use a MapView inside a map fragment and fragment backstack.

Kotlin

FragmentBackStackActivity.kt


package com.mapbox.maps.testapp.examples

import android.annotation.SuppressLint
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.maps.MapboxMap
import com.mapbox.maps.Style
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ActivityEmptyFabBinding
import com.mapbox.maps.testapp.examples.fragment.MapFragment

class FragmentBackStackActivity : AppCompatActivity() {

  private lateinit var mapFragment: MapFragment

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding = ActivityEmptyFabBinding.inflate(layoutInflater)
    setContentView(binding.root)

    if (savedInstanceState == null) {
      mapFragment = MapFragment()
      mapFragment.getMapAsync {
        initMap(it)
      }
      supportFragmentManager.beginTransaction().apply {
        add(R.id.container, mapFragment, FRAGMENT_TAG)
      }.commit()
    } else {
      supportFragmentManager.findFragmentByTag(FRAGMENT_TAG)?.also { fragment ->
        if (fragment is MapFragment) {
          fragment.getMapAsync {
            initMap(it)
          }
        }
      }
    }

    binding.displayOnSecondDisplayButton.setOnClickListener { handleClick() }
    binding.fragmentButton.setOnClickListener { addNewFragment() }
  }

  private fun addNewFragment() {
    supportFragmentManager.beginTransaction().apply {
      replace(
        R.id.container,
        MapFragment().also {
          it.getMapAsync { mapboxMap -> initMap(mapboxMap) }
        }
      )
      addToBackStack("map_new_fragment_${System.currentTimeMillis()}")
    }.commit()
  }

  private fun initMap(mapboxMap: MapboxMap) {
    mapboxMap.loadStyle(Style.SATELLITE)
  }

  private fun handleClick() {
    supportFragmentManager.beginTransaction().apply {
      replace(R.id.container, EmptyFragment.newInstance())
      addToBackStack("map_empty_fragment")
    }.commit()
  }

  class EmptyFragment : androidx.fragment.app.Fragment() {

    companion object {
      fun newInstance(): EmptyFragment {
        return EmptyFragment()
      }
    }

    @SuppressLint("SetTextI18n")
    override fun onCreateView(
      inflater: LayoutInflater,
      container: ViewGroup?,
      savedInstanceState: Bundle?
    ): View {
      val textView = TextView(inflater.context)
      textView.text = "This is an empty Fragment"
      return textView
    }
  }

  companion object {
    private const val FRAGMENT_TAG = "map_fragment"
  }
}

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