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[英]Floating action button not visible over the Google Map in Android Studio
[英]Floating Action Button not visible over Mapbox Android
自从我开发 Android 应用程序以来已经有一段时间了。 所以目前的开发工作对我来说是很新的。 我正在尝试创建一个基于 Mapbox Android API 的应用程序。 到目前为止,我已成功加载用户位置并根据位置变化移动相机; 但是,我在布局上添加的 FAB 没有显示在模拟器或我的手机中。 它在 XML 设计视图中可见。 我相信这可能是由于 MapsActivity.kt 中的setContentView(mapView)
,我不知道它是如何无法加载整个布局的。 我错过了什么吗?
activity_maps.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<com.mapbox.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="40.7128"
mapbox:mapbox_cameraTargetLng="-74.0060"
mapbox:mapbox_cameraZoom="9.0">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:backgroundTint="@color/purple_200"
android:layout_margin="16dp"
android:contentDescription="@string/fab_description"
android:src="@drawable/ic_plus_icon"
tools:ignore="ImageContrastCheck" />
</com.mapbox.maps.MapView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
MapsActivity.kt
package com.example.pinpoint
import android.Manifest
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.core.app.ActivityCompat
import com.example.pinpoint.com.example.pinpoint.LocationInitHelper
import com.example.pinpoint.com.example.pinpoint.LocationListeningCallback
import com.example.pinpoint.databinding.ActivityMapsBinding
import com.mapbox.android.core.location.LocationEngine
import com.mapbox.android.core.location.LocationEngineProvider
import com.mapbox.android.core.location.LocationEngineRequest
import com.mapbox.maps.CameraOptions
import com.mapbox.maps.MapView
import com.mapbox.maps.Style
import com.mapbox.maps.plugin.gestures.gestures
import com.mapbox.maps.plugin.locationcomponent.location
import java.lang.ref.WeakReference
class MapsActivity : AppCompatActivity() {
private lateinit var mapView: MapView
private lateinit var locationEngine: LocationEngine
private val callback = LocationListeningCallback(this)
private lateinit var locationPermissionHelper: LocationPermissionHelper
private lateinit var locationInitHelper: LocationInitHelper
private lateinit var binding: ActivityMapsBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMapsBinding.inflate(layoutInflater)
mapView = MapView(binding.root.context)
setContentView(mapView)
locationInitHelper = LocationInitHelper(WeakReference(this))
locationInitHelper.setMapView(mapView)
mapView.getMapboxMap().loadStyleUri(Style.MAPBOX_STREETS)
locationEngine = LocationEngineProvider.getBestLocationEngine(this)
locationPermissionHelper = LocationPermissionHelper(WeakReference(this))
onMapReady()
}
private fun onMapReady(){
val DEFAULT_INTERVAL_IN_MILLISECONDS = 1000L
val DEFAULT_MAX_WAIT_TIME = DEFAULT_INTERVAL_IN_MILLISECONDS * 5
locationEngine = LocationEngineProvider.getBestLocationEngine(this)
var request = LocationEngineRequest.Builder(DEFAULT_INTERVAL_IN_MILLISECONDS)
.setPriority(LocationEngineRequest.PRIORITY_NO_POWER)
.setMaxWaitTime(DEFAULT_MAX_WAIT_TIME)
.build()
if (ActivityCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_FINE_LOCATION
) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_COARSE_LOCATION
) != PackageManager.PERMISSION_GRANTED
) {
locationPermissionHelper.checkPermissions { onMapReady() }
}
locationEngine.requestLocationUpdates(request, callback, mainLooper)
locationEngine.getLastLocation(callback)
mapView.getMapboxMap().setCamera(
CameraOptions.Builder()
.zoom(12.0)
.build()
)
locationInitHelper.initLocationComponent()
locationInitHelper.setupGesturesListener()
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
}
override fun onDestroy() {
super.onDestroy()
mapView.location
.removeOnIndicatorBearingChangedListener(locationInitHelper.onIndicatorBearingChangedListener)
mapView.location
.removeOnIndicatorPositionChangedListener(locationInitHelper.onIndicatorPositionChangedListener)
mapView.gestures.removeOnMoveListener(locationInitHelper.onMoveListener)
}
override fun onStop() {
super.onStop()
locationEngine.removeLocationUpdates(callback)
}
}
尝试这个
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<com.mapbox.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="40.7128"
mapbox:mapbox_cameraTargetLng="-74.0060"
mapbox:mapbox_cameraZoom="9.0">
</com.mapbox.maps.MapView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:backgroundTint="@color/purple_200"
android:layout_margin="16dp"
android:src="@drawable/ic_app_icon"
android:tint="@color/white"
tools:ignore="ImageContrastCheck" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
尝试像这样在 mapview 之外声明浮动操作按钮:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<com.mapbox.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="40.7128"
mapbox:mapbox_cameraTargetLng="-74.0060"
mapbox:mapbox_cameraZoom="9.0"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:backgroundTint="@color/purple_200"
android:layout_margin="16dp"
android:contentDescription="@string/fab_description"
android:src="@drawable/ic_plus_icon"
tools:ignore="ImageContrastCheck" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
我能够通过 MapsActivity.kt 解决这个问题。 因为我怀疑setContentView()
得到了错误的视图,所以我替换了那个部分并手动将视图分配给mapView
。 该脚本如下所示:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_maps)
mapView = findViewById(R.id.mapView)
locationInitHelper = LocationInitHelper(WeakReference(this))
locationInitHelper.setMapView(mapView)
mapView.getMapboxMap().loadStyleUri(Style.MAPBOX_STREETS)
locationEngine = LocationEngineProvider.getBestLocationEngine(this)
locationPermissionHelper = LocationPermissionHelper(WeakReference(this))
onMapReady()
}
感谢所有的答案!
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