无论您在 android 上的哪个位置缩放,都保持地图居中
Keep map centered regardless of where you pinch zoom on android
我正在寻找类似于 Uber 处理双指缩放事件的方法。无论您在屏幕上的哪个位置捏合,它都会使地图居中并在中心位置放大。有没有办法在不覆盖地图片段的情况下做到这一点?或者我应该只禁用地图事件,在地图片段上创建一个叠加层,并处理叠加层中的所有缩放/其他事件?
就我个人而言,我只会在地图上禁用缩放手势,在叠加层上检测收缩,然后将其他所有内容传递给地图。
google-maps v2 API 没有任何明确的自定义缩放处理。虽然我确定您可以注入一些东西,但使用覆盖方法可以使您免受 google-maps 更改的影响,并让您在需要时更轻松地支持其他地图提供商。
(仅出于完整性考虑:您还可以处理 post-相机更改事件并重新居中,但这将是一种卡顿、糟糕的用户体验。)
这是 MechEthan 正在考虑的代码。
首先,您必须检测覆盖视图上的双击。
public class TouchableWrapper extends FrameLayout {
private final GestureDetector.SimpleOnGestureListener mGestureListener
= new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDoubleTap(MotionEvent e) {
//Notify the event bus (I am using Otto eventbus of course) that you have just received a double-tap event on the map, inside the event bus event listener
EventBus_Singleton.getInstance().post(new EventBus_Poster("double_tapped_map"));
return true;
}
};
public TouchableWrapper(Context context) {
super(context);
mGestureDetector = new GestureDetectorCompat(context, mGestureListener);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
mGestureDetector.onTouchEvent(ev);
return super.onInterceptTouchEvent(ev);
}
}
无论您在何处抓取 mapView,都将该 mapView 包装在上面创建的 TouchableWrapper 中。我就是这样做的,因为我有需要将 mapFragment 添加到另一个片段中的问题,所以我需要一个自定义 SupportMapFragment 来执行此操作
public class CustomMap_Fragment extends SupportMapFragment {
TouchableWrapper mTouchView;
public CustomMap_Fragment() {
super();
}
public static CustomMap_Fragment newInstance() {
return new CustomMap_Fragment();
}
@Override
public View onCreateView(LayoutInflater arg0, ViewGroup arg1, Bundle arg2) {
View mapView = super.onCreateView(arg0, arg1, arg2);
Fragment fragment = getParentFragment();
if (fragment != null && fragment instanceof OnMapReadyListener) {
((OnMapReadyListener) fragment).onMapReady();
}
mTouchView = new TouchableWrapper(getActivity());
mTouchView.addView(mapView);
return mTouchView;
}
public static interface OnMapReadyListener {
void onMapReady();
}
}
在我的 Map_Fragment 中(最终将位于 activity 的 FrameLayout 中,支持用于切换视图的导航抽屉和片段事务)
mMapFragment = CustomMap_Fragment.newInstance();
getChildFragmentManager().beginTransaction().replace(R.id.map_container, mMapFragment).commit();
现在终于在我刚拿到地图的同一个 Fragment 中,EventBus 接收器在接收到 "double_tapped_map":
时将执行以下操作
@Subscribe public void eventBus_ListenerMethod(AnswerAvailableEvent event) {
//Construct a CameraUpdate object that will zoom into the exact middle of the map, with a zoom of currentCameraZoom + 1 unit
zoomInUpdate = CameraUpdateFactory.zoomIn();
//Run that with a speed of 400 ms.
map.animateCamera(zoomInUpdate, 400, null);
}
注意:要完美实现这一点,您可以在地图上禁用缩放手势(这意味着您可以 myMap.getUiSettings().setZoomGesturesEnabled(false);
。如果不这样做,您将能够在地图上双击非常快,您会看到它会远离中心,因为双击的实现与我在发布的第一个答案中的完全一样,即他们从之前的点击时间中减去当前时间,因此 window 你可以在第三次点击时滑动并且它不会触发事件总线事件并且 google 地图将捕获它;所以禁用缩放手势。
但是,你会发现 pinch-in/out 将不再起作用,你还必须处理捏,我也做过,但需要大约 1 小时,我还没有时间去做但是 100% 我会在这样做时更新答案。
提示:Uber 也禁用了地图上的旋转手势。 map.getUiSettings().setRotateGesturesEnabled(false);
在 google 上搜索了大约 3 天后,我找到了完整的解决方案。我的答案是从 .
编辑的
public class CustomMapView extends MapView {
private int fingers = 0;
private GoogleMap googleMap;
private long lastZoomTime = 0;
private float lastSpan = -1;
private Handler handler = new Handler();
private ScaleGestureDetector scaleGestureDetector;
private GestureDetector gestureDetector;
public CustomMapView(Context context) {
super(context);
}
public CustomMapView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomMapView(Context context, AttributeSet attrs, int style) {
super(context, attrs, style);
}
public CustomMapView(Context context, GoogleMapOptions options) {
super(context, options);
}
public void init(GoogleMap map) {
scaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
if (lastSpan == -1) {
lastSpan = detector.getCurrentSpan();
} else if (detector.getEventTime() - lastZoomTime >= 50) {
lastZoomTime = detector.getEventTime();
googleMap.animateCamera(CameraUpdateFactory.zoomBy(getZoomValue(detector.getCurrentSpan(), lastSpan)), 50, null);
lastSpan = detector.getCurrentSpan();
}
return false;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
lastSpan = -1;
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
lastSpan = -1;
}
});
gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
disableScrolling();
googleMap.animateCamera(CameraUpdateFactory.zoomIn(), 400, null);
return true;
}
});
googleMap = map;
}
private float getZoomValue(float currentSpan, float lastSpan) {
double value = (Math.log(currentSpan / lastSpan) / Math.log(1.55d));
return (float) value;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
gestureDetector.onTouchEvent(ev);
switch (ev.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
fingers = fingers + 1;
break;
case MotionEvent.ACTION_POINTER_UP:
fingers = fingers - 1;
break;
case MotionEvent.ACTION_UP:
fingers = 0;
break;
case MotionEvent.ACTION_DOWN:
fingers = 1;
break;
}
if (fingers > 1) {
disableScrolling();
} else if (fingers < 1) {
enableScrolling();
}
if (fingers > 1) {
return scaleGestureDetector.onTouchEvent(ev);
} else {
return super.dispatchTouchEvent(ev);
}
}
private void enableScrolling() {
if (googleMap != null && !googleMap.getUiSettings().isScrollGesturesEnabled()) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
googleMap.getUiSettings().setAllGesturesEnabled(true);
}
}, 50);
}
}
private void disableScrolling() {
handler.removeCallbacksAndMessages(null);
if (googleMap != null && googleMap.getUiSettings().isScrollGesturesEnabled()) {
googleMap.getUiSettings().setAllGesturesEnabled(false);
}
}
}
并自定义 MapFragment
public class CustomMapFragment extends Fragment {
CustomMapView view;
Bundle bundle;
GoogleMap map;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bundle = savedInstanceState;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_map, container, false);
view = (CustomMapView) v.findViewById(R.id.mapView);
view.onCreate(bundle);
view.onResume();
map = view.getMap();
view.init(map);
MapsInitializer.initialize(getActivity());
return v;
}
public GoogleMap getMap() {
return map;
}
@Override
public void onResume() {
super.onResume();
view.onResume();
}
@Override
public void onPause() {
super.onPause();
view.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
view.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
view.onLowMemory();
}
}
最后,在你的activity中:
....
<fragment
android:id="@+id/map"
class="yourpackage.CustomMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
...
我已经在 Android 4.1 (API 16) 和更高版本上进行了测试,它运行良好且流畅。 (大约 API < 16,我没有任何设备可以测试)。
您可以使用 LatLngBounds 来限制地图从您想要的位置移动。 (可以将边界的东北角和西南角设置为同一个点) .
请检查以下内容link。
https://developers.google.com/maps/documentation/android-api/views
我也有同样的需求。为了解决这个问题,我必须了解android中事件是如何处理的,因为我们必须拦截缩放的触摸事件并将滚动事件传递给地图。
为此,我们需要一个基于 Google 地图视图的自定义视图。我们的自定义视图拦截触摸事件,并决定是不给底层地图处理机会还是让底层地图自己处理所有事件来决定是否处理后续事件。
现在编码时间 -
我们在这里需要两件事 - 一个自定义片段,一个自定义视图。
自定义片段
public class CustomMapFragment extends SupportMapFragment implements OnMapReadyCallback {
public View mapView = null;
public WrapperView wrapperView = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
mapView = super.onCreateView(inflater, parent, savedInstanceState);
wrapperView = new WrapperView(getActivity());
wrapperView.addView(mapView);
SupportMapFragment mapFragment = (SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
return wrapperView;
}
@Override
public View getView() {
return mapView;
}
@Override
public void onMapReady(GoogleMap googleMap) {
wrapperView.setGoogleMap(googleMap);
}
自定义视图
public class WrapperView extends FrameLayout {
private GoogleMap googleMap;
Activity activity = null;
ScaleGestureDetector scaleGestureDetector;
public WrapperView(Activity activity) {
super(activity);
this.activity=activity;
scaleGestureDetector = new ScaleGestureDetector(activity ,new MyOnScaleGestureListener());
}
public void setGoogleMap(GoogleMap map){
googleMap = map;
}
private boolean isZoomInProgress(MotionEvent event){
if(event.getPointerCount()>1){
return true;
}
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event){
return isZoomInProgress(event);
}
@Override
public boolean onTouchEvent(MotionEvent event){
return scaleGestureDetector.onTouchEvent(event);
}
public class MyOnScaleGestureListener extends
ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
float previousSpan = detector.getPreviousSpan();
float currentSpan = detector.getCurrentSpan();
float targetSpan;
if(previousSpan>currentSpan){
targetSpan = previousSpan-currentSpan;
}else{
targetSpan = currentSpan-previousSpan;
}
float scaleFactor = detector.getScaleFactor();
if (scaleFactor > 1) {
if(googleMap.getCameraPosition().zoom!=googleMap.getMaxZoomLevel()) {
for(int j=0;j<(targetSpan*2);j++){
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(googleMap.getCameraPosition().target, googleMap.getCameraPosition().zoom + 0.002f));
}
}
} else {
if (googleMap.getCameraPosition().zoom != googleMap.getMinZoomLevel()) {
for(int j=0;j<(targetSpan*2);j++){
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(googleMap.getCameraPosition().target, googleMap.getCameraPosition().zoom - 0.002f));
}
}
}
return true;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {}
}
在您的视图中使用新的自定义片段,如下所示 -
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="yourpackage.CustomMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />
我正在寻找类似于 Uber 处理双指缩放事件的方法。无论您在屏幕上的哪个位置捏合,它都会使地图居中并在中心位置放大。有没有办法在不覆盖地图片段的情况下做到这一点?或者我应该只禁用地图事件,在地图片段上创建一个叠加层,并处理叠加层中的所有缩放/其他事件?
就我个人而言,我只会在地图上禁用缩放手势,在叠加层上检测收缩,然后将其他所有内容传递给地图。
google-maps v2 API 没有任何明确的自定义缩放处理。虽然我确定您可以注入一些东西,但使用覆盖方法可以使您免受 google-maps 更改的影响,并让您在需要时更轻松地支持其他地图提供商。
(仅出于完整性考虑:您还可以处理 post-相机更改事件并重新居中,但这将是一种卡顿、糟糕的用户体验。)
这是 MechEthan 正在考虑的代码。
首先,您必须检测覆盖视图上的双击。
public class TouchableWrapper extends FrameLayout { private final GestureDetector.SimpleOnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() { @Override public boolean onDoubleTap(MotionEvent e) { //Notify the event bus (I am using Otto eventbus of course) that you have just received a double-tap event on the map, inside the event bus event listener EventBus_Singleton.getInstance().post(new EventBus_Poster("double_tapped_map")); return true; } }; public TouchableWrapper(Context context) { super(context); mGestureDetector = new GestureDetectorCompat(context, mGestureListener); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { mGestureDetector.onTouchEvent(ev); return super.onInterceptTouchEvent(ev); } }
无论您在何处抓取 mapView,都将该 mapView 包装在上面创建的 TouchableWrapper 中。我就是这样做的,因为我有需要将 mapFragment 添加到另一个片段中的问题,所以我需要一个自定义 SupportMapFragment 来执行此操作
public class CustomMap_Fragment extends SupportMapFragment { TouchableWrapper mTouchView; public CustomMap_Fragment() { super(); } public static CustomMap_Fragment newInstance() { return new CustomMap_Fragment(); } @Override public View onCreateView(LayoutInflater arg0, ViewGroup arg1, Bundle arg2) { View mapView = super.onCreateView(arg0, arg1, arg2); Fragment fragment = getParentFragment(); if (fragment != null && fragment instanceof OnMapReadyListener) { ((OnMapReadyListener) fragment).onMapReady(); } mTouchView = new TouchableWrapper(getActivity()); mTouchView.addView(mapView); return mTouchView; } public static interface OnMapReadyListener { void onMapReady(); } }
在我的 Map_Fragment 中(最终将位于 activity 的 FrameLayout 中,支持用于切换视图的导航抽屉和片段事务)
mMapFragment = CustomMap_Fragment.newInstance(); getChildFragmentManager().beginTransaction().replace(R.id.map_container, mMapFragment).commit();
现在终于在我刚拿到地图的同一个 Fragment 中,EventBus 接收器在接收到 "double_tapped_map":
时将执行以下操作@Subscribe public void eventBus_ListenerMethod(AnswerAvailableEvent event) { //Construct a CameraUpdate object that will zoom into the exact middle of the map, with a zoom of currentCameraZoom + 1 unit zoomInUpdate = CameraUpdateFactory.zoomIn(); //Run that with a speed of 400 ms. map.animateCamera(zoomInUpdate, 400, null); }
注意:要完美实现这一点,您可以在地图上禁用缩放手势(这意味着您可以 myMap.getUiSettings().setZoomGesturesEnabled(false);
。如果不这样做,您将能够在地图上双击非常快,您会看到它会远离中心,因为双击的实现与我在发布的第一个答案中的完全一样,即他们从之前的点击时间中减去当前时间,因此 window 你可以在第三次点击时滑动并且它不会触发事件总线事件并且 google 地图将捕获它;所以禁用缩放手势。
但是,你会发现 pinch-in/out 将不再起作用,你还必须处理捏,我也做过,但需要大约 1 小时,我还没有时间去做但是 100% 我会在这样做时更新答案。
提示:Uber 也禁用了地图上的旋转手势。 map.getUiSettings().setRotateGesturesEnabled(false);
在 google 上搜索了大约 3 天后,我找到了完整的解决方案。我的答案是从
public class CustomMapView extends MapView {
private int fingers = 0;
private GoogleMap googleMap;
private long lastZoomTime = 0;
private float lastSpan = -1;
private Handler handler = new Handler();
private ScaleGestureDetector scaleGestureDetector;
private GestureDetector gestureDetector;
public CustomMapView(Context context) {
super(context);
}
public CustomMapView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomMapView(Context context, AttributeSet attrs, int style) {
super(context, attrs, style);
}
public CustomMapView(Context context, GoogleMapOptions options) {
super(context, options);
}
public void init(GoogleMap map) {
scaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
if (lastSpan == -1) {
lastSpan = detector.getCurrentSpan();
} else if (detector.getEventTime() - lastZoomTime >= 50) {
lastZoomTime = detector.getEventTime();
googleMap.animateCamera(CameraUpdateFactory.zoomBy(getZoomValue(detector.getCurrentSpan(), lastSpan)), 50, null);
lastSpan = detector.getCurrentSpan();
}
return false;
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
lastSpan = -1;
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
lastSpan = -1;
}
});
gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
disableScrolling();
googleMap.animateCamera(CameraUpdateFactory.zoomIn(), 400, null);
return true;
}
});
googleMap = map;
}
private float getZoomValue(float currentSpan, float lastSpan) {
double value = (Math.log(currentSpan / lastSpan) / Math.log(1.55d));
return (float) value;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
gestureDetector.onTouchEvent(ev);
switch (ev.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_POINTER_DOWN:
fingers = fingers + 1;
break;
case MotionEvent.ACTION_POINTER_UP:
fingers = fingers - 1;
break;
case MotionEvent.ACTION_UP:
fingers = 0;
break;
case MotionEvent.ACTION_DOWN:
fingers = 1;
break;
}
if (fingers > 1) {
disableScrolling();
} else if (fingers < 1) {
enableScrolling();
}
if (fingers > 1) {
return scaleGestureDetector.onTouchEvent(ev);
} else {
return super.dispatchTouchEvent(ev);
}
}
private void enableScrolling() {
if (googleMap != null && !googleMap.getUiSettings().isScrollGesturesEnabled()) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
googleMap.getUiSettings().setAllGesturesEnabled(true);
}
}, 50);
}
}
private void disableScrolling() {
handler.removeCallbacksAndMessages(null);
if (googleMap != null && googleMap.getUiSettings().isScrollGesturesEnabled()) {
googleMap.getUiSettings().setAllGesturesEnabled(false);
}
}
}
并自定义 MapFragment
public class CustomMapFragment extends Fragment {
CustomMapView view;
Bundle bundle;
GoogleMap map;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bundle = savedInstanceState;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_map, container, false);
view = (CustomMapView) v.findViewById(R.id.mapView);
view.onCreate(bundle);
view.onResume();
map = view.getMap();
view.init(map);
MapsInitializer.initialize(getActivity());
return v;
}
public GoogleMap getMap() {
return map;
}
@Override
public void onResume() {
super.onResume();
view.onResume();
}
@Override
public void onPause() {
super.onPause();
view.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
view.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
view.onLowMemory();
}
}
最后,在你的activity中:
....
<fragment
android:id="@+id/map"
class="yourpackage.CustomMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
...
我已经在 Android 4.1 (API 16) 和更高版本上进行了测试,它运行良好且流畅。 (大约 API < 16,我没有任何设备可以测试)。
您可以使用 LatLngBounds 来限制地图从您想要的位置移动。 (可以将边界的东北角和西南角设置为同一个点) .
请检查以下内容link。
https://developers.google.com/maps/documentation/android-api/views
我也有同样的需求。为了解决这个问题,我必须了解android中事件是如何处理的,因为我们必须拦截缩放的触摸事件并将滚动事件传递给地图。 为此,我们需要一个基于 Google 地图视图的自定义视图。我们的自定义视图拦截触摸事件,并决定是不给底层地图处理机会还是让底层地图自己处理所有事件来决定是否处理后续事件。
现在编码时间 - 我们在这里需要两件事 - 一个自定义片段,一个自定义视图。
自定义片段
public class CustomMapFragment extends SupportMapFragment implements OnMapReadyCallback { public View mapView = null; public WrapperView wrapperView = null; @Override public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) { mapView = super.onCreateView(inflater, parent, savedInstanceState); wrapperView = new WrapperView(getActivity()); wrapperView.addView(mapView); SupportMapFragment mapFragment = (SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map); mapFragment.getMapAsync(this); return wrapperView; } @Override public View getView() { return mapView; } @Override public void onMapReady(GoogleMap googleMap) { wrapperView.setGoogleMap(googleMap); }
自定义视图
public class WrapperView extends FrameLayout { private GoogleMap googleMap; Activity activity = null; ScaleGestureDetector scaleGestureDetector; public WrapperView(Activity activity) { super(activity); this.activity=activity; scaleGestureDetector = new ScaleGestureDetector(activity ,new MyOnScaleGestureListener()); } public void setGoogleMap(GoogleMap map){ googleMap = map; } private boolean isZoomInProgress(MotionEvent event){ if(event.getPointerCount()>1){ return true; } return false; } @Override public boolean onInterceptTouchEvent(MotionEvent event){ return isZoomInProgress(event); } @Override public boolean onTouchEvent(MotionEvent event){ return scaleGestureDetector.onTouchEvent(event); } public class MyOnScaleGestureListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { @Override public boolean onScale(ScaleGestureDetector detector) { float previousSpan = detector.getPreviousSpan(); float currentSpan = detector.getCurrentSpan(); float targetSpan; if(previousSpan>currentSpan){ targetSpan = previousSpan-currentSpan; }else{ targetSpan = currentSpan-previousSpan; } float scaleFactor = detector.getScaleFactor(); if (scaleFactor > 1) { if(googleMap.getCameraPosition().zoom!=googleMap.getMaxZoomLevel()) { for(int j=0;j<(targetSpan*2);j++){ googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(googleMap.getCameraPosition().target, googleMap.getCameraPosition().zoom + 0.002f)); } } } else { if (googleMap.getCameraPosition().zoom != googleMap.getMinZoomLevel()) { for(int j=0;j<(targetSpan*2);j++){ googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(googleMap.getCameraPosition().target, googleMap.getCameraPosition().zoom - 0.002f)); } } } return true; } @Override public boolean onScaleBegin(ScaleGestureDetector detector) { return true; } @Override public void onScaleEnd(ScaleGestureDetector detector) {} }
在您的视图中使用新的自定义片段,如下所示 -
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="yourpackage.CustomMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />