我找不到有关如何在新的 Google Maps API v2 上拦截地图触摸的示例。
我需要知道用户何时触摸地图以停止线程(地图以我当前位置为中心)。
我找不到有关如何在新的 Google Maps API v2 上拦截地图触摸的示例。
我需要知道用户何时触摸地图以停止线程(地图以我当前位置为中心)。
@ape 在这里写了一个关于如何拦截地图点击的答案,但我需要拦截触摸,然后他在其答案的评论中建议了以下链接,How to handle onTouch event for map in Google Map API v2? .
该解决方案似乎是一种可能的解决方法,但建议的代码不完整。出于这个原因,我重写并测试了它,现在它可以工作了。
这是工作代码:
我创建了 MySupportMapFragment.java 类
import com.google.android.gms.maps.SupportMapFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MySupportMapFragment extends SupportMapFragment {
public View mOriginalContentView;
public TouchableWrapper mTouchView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
mOriginalContentView = super.onCreateView(inflater, parent, savedInstanceState);
mTouchView = new TouchableWrapper(getActivity());
mTouchView.addView(mOriginalContentView);
return mTouchView;
}
@Override
public View getView() {
return mOriginalContentView;
}
}
我什至创建了 TouchableWrapper.java 类:
import android.content.Context;
import android.view.MotionEvent;
import android.widget.FrameLayout;
public class TouchableWrapper extends FrameLayout {
public TouchableWrapper(Context context) {
super(context);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
MainActivity.mMapIsTouched = true;
break;
case MotionEvent.ACTION_UP:
MainActivity.mMapIsTouched = false;
break;
}
return super.dispatchTouchEvent(event);
}
}
在布局中,我这样声明:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_below="@+id/buttonBar"
class="com.myFactory.myApp.MySupportMapFragment"
/>
只是为了在主要活动中进行测试,我只写了以下内容:
public class MainActivity extends FragmentActivity {
public static boolean mMapIsTouched = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
这是根据用户选择获取位置的简单解决方案(单击地图上的选项):
googleMap.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng arg0) {
// TODO Auto-generated method stub
Log.d("arg0", arg0.latitude + "-" + arg0.longitude);
}
});
现在支持此功能以及更多功能:)
这是开发人员说明(问题 4636):
2016 年 8 月的版本引入了一组新的摄像机变化侦听器,用于摄像机运动开始、正在进行和结束事件。您还可以查看相机移动的原因,无论是由用户手势、内置 API 动画还是开发人员控制的移动引起的。有关详细信息,请参阅相机更换事件指南: https ://developers.google.com/maps/documentation/android-api/events#camera-change-events
另外,请参阅发行说明: https ://developers.google.com/maps/documentation/android-api/releases#august_1_2016
这是文档页面中的代码片段
public class MyCameraActivity extends FragmentActivity implements
OnCameraMoveStartedListener,
OnCameraMoveListener,
OnCameraMoveCanceledListener,
OnCameraIdleListener,
OnMapReadyCallback {
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_camera);
SupportMapFragment mapFragment =
(SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap map) {
mMap = map;
mMap.setOnCameraIdleListener(this);
mMap.setOnCameraMoveStartedListener(this);
mMap.setOnCameraMoveListener(this);
mMap.setOnCameraMoveCanceledListener(this);
// Show Sydney on the map.
mMap.moveCamera(CameraUpdateFactory
.newLatLngZoom(new LatLng(-33.87365, 151.20689), 10));
}
@Override
public void onCameraMoveStarted(int reason) {
if (reason == OnCameraMoveStartedListener.REASON_GESTURE) {
Toast.makeText(this, "The user gestured on the map.",
Toast.LENGTH_SHORT).show();
} else if (reason == OnCameraMoveStartedListener
.REASON_API_ANIMATION) {
Toast.makeText(this, "The user tapped something on the map.",
Toast.LENGTH_SHORT).show();
} else if (reason == OnCameraMoveStartedListener
.REASON_DEVELOPER_ANIMATION) {
Toast.makeText(this, "The app moved the camera.",
Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCameraMove() {
Toast.makeText(this, "The camera is moving.",
Toast.LENGTH_SHORT).show();
}
@Override
public void onCameraMoveCanceled() {
Toast.makeText(this, "Camera movement canceled.",
Toast.LENGTH_SHORT).show();
}
@Override
public void onCameraIdle() {
Toast.makeText(this, "The camera has stopped moving.",
Toast.LENGTH_SHORT).show();
}
}
我在布局中的 MapFragment 之上创建了一个空的 FrameLayout。然后我在这个视图上设置了一个 onTouchListener,这样我就知道地图何时被触摸,但返回 false 以便将触摸传递给地图。
<FrameLayout
android:id="@+id/map_touch_layer"
android:layout_width="match_parent"
android:layout_height="match_parent" />
mapTouchLayer.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Utils.logDebug(TAG, "Map touched!");
timeLastTouched = System.currentTimeMillis();
return false; // Pass on the touch to the map or shadow layer.
}
});
Gaucho 有一个很好的答案,看到许多赞成票,我认为可能需要另一种实现:
我需要它来使用监听器,这样我就可以对触摸做出反应,而不必经常检查它。
我将所有内容放在一个可以像这样使用的类中:
mapFragment.setNonConsumingTouchListener(new TouchSupportMapFragment.NonConsumingTouchListener() {
@Override
public void onTouch(MotionEvent motionEvent) {
switch (motionEvent.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// map is touched
break;
case MotionEvent.ACTION_UP:
// map touch ended
break;
default:
break;
// use more cases if needed, for example MotionEvent.ACTION_MOVE
}
}
});
其中 mapfragment 需要是 TouchSupportMapFragment 类型,并且在布局 xml 中需要这一行:
<fragment class="de.bjornson.maps.TouchSupportMapFragment"
...
这是课程:
package de.bjornson.maps;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import com.google.android.gms.maps.SupportMapFragment;
public class TouchSupportMapFragment extends SupportMapFragment {
public View mOriginalContentView;
public TouchableWrapper mTouchView;
private NonConsumingTouchListener mListener;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
mOriginalContentView = super.onCreateView(inflater, parent, savedInstanceState);
mTouchView = new TouchableWrapper(getActivity());
mTouchView.addView(mOriginalContentView);
return mTouchView;
}
@Override
public View getView() {
return mOriginalContentView;
}
public void setNonConsumingTouchListener(NonConsumingTouchListener listener) {
mListener = listener;
}
public interface NonConsumingTouchListener {
boolean onTouch(MotionEvent motionEvent);
}
public class TouchableWrapper extends FrameLayout {
public TouchableWrapper(Context context) {
super(context);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (mListener != null) {
mListener.onTouch(event);
}
return super.dispatchTouchEvent(event);
}
}
}
请参阅此链接。实现接口并填写onMapClick()
方法或任何您需要的方法并将其设置onMapClickListener
为正确的实现。
public class YourActivity extends Activity implements OnMapClickListener {
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
...
my_map.setOnMapClickListener(this)
...
}
public void onMapClick (LatLng point) {
// Do Something
}
}
// Initializing
markerPoints = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment sfm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
map = sfm.getMap();
// Enable MyLocation Button in the Map
map.setMyLocationEnabled(true);
// Setting onclick event listener for the map
map.setOnMapClickListener(new OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
// Already two locations
if(markerPoints.size()>1){
markerPoints.clear();
map.clear();
}
// Adding new item to the ArrayList
markerPoints.add(point);
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(point);
if(markerPoints.size()==1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
}else if(markerPoints.size()==2){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
map.addMarker(options);
// Checks, whether start and end locations are captured
if(markerPoints.size() >= 2){
LatLng origin = markerPoints.get(0);
LatLng dest = markerPoints.get(1);
//Do what ever you want with origin and dest
}
}
});
我从接受的答案中汲取了这个想法,并通过转换为 Kotlin 并添加允许在标记中声明可触摸包装器的构造函数来改进它,并使用可设置的回调属性进行触摸检测以直接删除与允许的活动的耦合它更容易重复使用:
class TouchableWrapper : FrameLayout {
constructor(context: Context) : this(context, null)
constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
var onTouch: ((event :MotionEvent) -> Unit)? = null
override fun dispatchTouchEvent(event: MotionEvent): Boolean {
onTouch?.invoke(event)
return super.dispatchTouchEvent(event)
}
}
然后在您的布局中:
<com.yourpackage.views.TouchableWrapper
android:id="@+id/viewMapWrapper"
android:layout_height="match_parent"
android:layout_width="match_parent">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</com.yourpackage.views.TouchableWrapper>
然后像这样设置你的回调:
findViewById<TouchableWrapper>(R.id.viewMapWrapper)
.onTouch = {
if (MotionEvent.ACTION_DOWN == it.action) {
//Handle touch down on the map
}
}
对于单声道爱好者:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;
using Android.Gms.Maps;
namespace apcurium.MK.Booking.Mobile.Client.Controls
{
public class TouchableMap : SupportMapFragment
{
public View mOriginalContentView;
public TouchableWrapper Surface;
public override View OnCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)
{
mOriginalContentView = base.OnCreateView(inflater, parent, savedInstanceState);
Surface = new TouchableWrapper(Activity);
Surface.AddView(mOriginalContentView);
return Surface;
}
public override View View
{
get
{
return mOriginalContentView;
}
}
}
public class TouchableWrapper: FrameLayout {
public event EventHandler<MotionEvent> Touched;
public TouchableWrapper(Context context) :
base(context)
{
}
public TouchableWrapper(Context context, IAttributeSet attrs) :
base(context, attrs)
{
}
public TouchableWrapper(Context context, IAttributeSet attrs, int defStyle) :
base(context, attrs, defStyle)
{
}
public override bool DispatchTouchEvent(MotionEvent e)
{
if (this.Touched != null)
{
this.Touched(this, e);
}
return base.DispatchTouchEvent(e);
}
}
}
我有一个更简单的解决方案TouchableWrapper
,它与最新版本的play-services-maps:10.0.1
. 此解决方案仅使用地图事件,不使用自定义视图。不使用不推荐使用的功能,并且可能会支持多个版本。
首先,您需要一个标志变量来存储地图是由动画还是由用户输入移动(此代码假定每个不是由动画触发的相机移动都是由用户触发的)
GoogleMap googleMap;
boolean movedByApi = false;
您的片段或活动必须实施GoogleMap.OnMapReadyCallback
,GoogleMap.CancelableCallback
public class ActivityMap extends Activity implements OnMapReadyCallback, GoogleMap.CancelableCallback{
...
}
这会迫使您实现方法onMapReady
, onFinish
, onCancel
. 并且其中的 googleMap 对象onMapReady
必须为相机移动设置一个事件监听器
@Override
public void onMapReady(GoogleMap mMap) {
//instantiate the map
googleMap = mMap;
[...] // <- set up your map
googleMap.setOnCameraMoveListener(new GoogleMap.OnCameraMoveListener() {
@Override
public void onCameraMove() {
if (movedByApi) {
Toast.makeText(ActivityMap.this, "Moved by animation", Toast.LENGTH_SHORT).show();
[...] // <-- do something whe you want to handle api camera movement
} else {
Toast.makeText(ActivityMap.this, "Moved by user", Toast.LENGTH_SHORT).show();
[...] // <-- do something whe you want to handle user camera movement
}
}
});
}
@Override
public void onFinish() {
//is called when the animation is finished
movedByApi = false;
}
@Override
public void onCancel() {
//is called when the animation is canceled (the user drags the map or the api changes to a ne position)
movedByApi = false;
}
最后,如果您创建一个用于移动地图的通用函数会更好
public void moveMapPosition(CameraUpdate cu, boolean animated){
//activate the flag notifying that the map is being moved by the api
movedByApi = true;
//if its not animated, just do instant move
if (!animated) {
googleMap.moveCamera(cu);
//after the instant move, clear the flag
movedByApi = false;
}
else
//if its animated, animate the camera
googleMap.animateCamera(cu, this);
}
或者只是每次移动地图时,在动画之前激活标志
movedByApi = true;
googleMap.animateCamera(cu, this);
我希望这有帮助!
@Gaucho MySupportMapFragment 显然会被其他一些片段或活动使用(其中可能有比地图片段更多的视图元素)。那么如何将这个事件分派到下一个要使用它的片段。我们是否需要再次编写一个接口来做到这一点?