平移地图时禁用滚动视图

Question

我对 android 编程非常陌生，对 kotlin 甚至很新，但我正在尝试实现一个简单的活动作为概念证明，其中地图片段是可滚动列表的一部分，稍后将用于捕获用户信息(以及地图上的标记位置)。

我使用谷歌开发人员教程让我的地图片段显示地图，现在我已经将该地图片段嵌入到滚动视图中。除了当我尝试垂直平移地图(北/南)时，我的滚动视图开始滚动之外，一切都正常。

如果我触摸地图片段区域，如何防止滚动视图移动？提前感谢您的帮助！

下面是活动的 XML 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorAccent">
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="TextView1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editTextTextPersonName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="172dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" />
<fragment
android:id="@+id/map_fragment"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_marginTop="28dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView3" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="200dp"
android:layout_marginBottom="16dp"
android:text="HELLO WORLD DOWN HERE"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/map_fragment" />

</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</LinearLayout>

这是koitlin活动MainActivity.kt：

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.codelabs.buildyourfirstmap
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.UiSettings
import com.google.android.gms.maps.model.LatLngBounds
import com.google.android.gms.maps.model.MarkerOptions
import com.google.codelabs.buildyourfirstmap.place.Place
import com.google.codelabs.buildyourfirstmap.place.PlacesReader
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val mapFragment = supportFragmentManager.findFragmentById(R.id.map_fragment) as? SupportMapFragment
mapFragment?.getMapAsync {
googleMap->addMarkers(googleMap)
}
mapFragment?.getMapAsync { googleMap ->
// Ensure all places are visible in the map.
googleMap.setOnMapLoadedCallback {
val bounds = LatLngBounds.builder()
places.forEach { bounds.include(it.latLng) }
googleMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds.build(), 20))
val uisettings = googleMap.uiSettings
googleMap.uiSettings.isZoomControlsEnabled = true
}
}
}
private val places: List<Place> by lazy {
PlacesReader(this).read()
}
/**
* Adds marker representations of the places list on the provided GoogleMap object
*/
private fun addMarkers(googleMap: GoogleMap) {
places.forEach { place ->
val marker = googleMap.addMarker(
MarkerOptions()
.title(place.name)
.position(place.latLng)
)
}
}
}

Answer 1

您应该在地图准备就绪后立即添加这些行：

googleMap.setOnCameraMoveStartedListener(OnCameraMoveStartedListener { i ->
if (i == OnCameraMoveStartedListener.REASON_GESTURE) {
blockScrollView()
}
})
googleMap.setOnCameraMoveCanceledListener(OnCameraMoveCanceledListener { enableScrollView() })

声明您的滚动视图并禁用，在blockScrollView()、enableScrollView()方法中启用它。

可选步骤：在类级别声明GoogleMap map;，并在getMapAsync方法中初始化googleMap。并且使用map而不是每次使用map时都调用getMapAsync。多次调用getMapAsync是错误的。