我找不到如何拦截新的Google Maps API v2上的地图触摸的示例。
我需要知道用户何时触摸地图以停止线程(地图围绕我当前位置的居中位置)。
我找不到如何拦截新的Google Maps API v2上的地图触摸的示例。
我需要知道用户何时触摸地图以停止线程(地图围绕我当前位置的居中位置)。
Answers:
@ape在这里写了一个关于如何拦截地图点击的答案,但是我需要拦截触摸,然后他在其答案的注释中建议了以下链接,即如何在Google Map API v2中处理地图的onTouch事件?。
该解决方案似乎是一种可能的解决方法,但是建议的代码不完整。因此,我重写并测试了它,现在它可以工作了。
这是工作代码:
我创建了类MySupportMapFragment.java
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;
}
}
我什至创建了类TouchableWrapper.java:
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"
/>
为了在主要活动中进行测试,我只编写了以下内容:
public class MainActivity extends FragmentActivity {
public static boolean mMapIsTouched = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
这是一个根据用户选择来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其他功能:)
这是开发人员说明(问题4636):
2016年8月发行的版本引入了一组新的摄像机更改侦听器,用于摄像机运动的开始,进行中和结束事件。您还可以查看相机为什么运动,这是由用户手势,内置API动画还是开发人员控制的运动引起的。有关详细信息,请参阅相机更改事件指南: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上方创建了一个空的FrameLayout。然后,我在此视图上设置一个onTouchListener,以便知道何时触摸了地图,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.
}
});
ACTION_DOWN
将导致ACTION_UP
中断,并且onTouch
不会为此调用它。
请参阅此链接。实现接口并填写onMapClick()
方法或所需的任何方法,然后将设置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
}
}
onMarkerDragListener
吗?developers.google.com/maps/documentation/android/reference/com/...
Gaucho有一个很好的答案,看到我认为有很多反对意见,可能需要另一种实现:
我需要它来使用听众,因此我可以对触摸做出反应,而不必经常检查。
我将所有类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
}
}
});
mapfragment需要为TouchSupportMapFragment类型,在布局xml中需要以下行:
<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);
}
}
}
// 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
}
}
});
对于Mono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);
}
}
}
我有一个不同于的更简单的解决方案,TouchableWrapper
并且适用于的最新版本play-services-maps:10.0.1
。此解决方案仅使用maps事件,而不使用自定义视图。不使用不推荐使用的功能,可能会支持多个版本。
首先,您需要一个标志变量,用于存储是通过动画还是通过用户输入来移动地图(此代码假定并非由动画触发的每个摄像机移动均由用户触发)
GoogleMap googleMap;
boolean movedByApi = false;
您的碎片化或活动必须实现GoogleMap.OnMapReadyCallback
,GoogleMap.CancelableCallback
public class ActivityMap extends Activity implements OnMapReadyCallback, GoogleMap.CancelableCallback{
...
}
这迫使你实现方法onMapReady
,onFinish
,onCancel
。并且中的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,如果您创建了用于移动地图的通用函数,那就更好了
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);
}
或仅在每次移动地图时,在动画之前激活标志
movedByApi = true;
googleMap.animateCamera(cu, this);
我希望这有帮助!
我从公认的答案中汲取了想法,并通过转换为Kotlin并添加了允许在标记中声明可触摸包装器的构造函数,并对触摸检测使用settable回调属性来消除与活动的直接耦合,从而改进了该思想。可以更轻松地重用:
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>
然后像这样设置您的回调:
findViewById<TouchableWrapper>(R.id.viewMapWrapper)
.onTouch = {
if (MotionEvent.ACTION_DOWN == it.action) {
//Handle touch down on the map
}
}
@Gaucho MySupportMapFragment显然会被其他某些活动或活动(其中视图元素可能多于地图片段)使用。因此,如何将这个事件调度到下一个将要使用的片段。我们是否需要再次编写一个接口来做到这一点?