Issue
GoogleMap by default doesn't provide event for map drag start and drag stop. I have already reported that problem here.
I want to make custom handler
that will use plain onTouch
event and combine it with setOnCameraChangeListener
.
However i failed to find how I can access onTouch
event of GoogleMap
object. It doesn't provide such callback.
I wonder how can i handle onTouch event for map in Google Map API v2?
Solution
Here is a possible workaround for determining drag start and drag end events:
You have to extend SupportMapFragment
or MapFragment
. In onCreateView()
you have to wrap your MapView
in a customized FrameLayout
(in example below it is the class TouchableWrapper
), in which you intercepts touch events and recognizes whether the map is tapped or not. If your onCameraChange
gets called, just check whether the map view is pressed or not (in example below this is the variable mMapIsTouched
).
Example code:
UPDATE 1:
- return original created view in
getView()
- use
dispatchTouchEvent()
instead ofonInterceptTouchEvent()
Customized FrameLayout:
private class TouchableWrapper extends FrameLayout {
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mMapIsTouched = true;
break;
case MotionEvent.ACTION_UP:
mMapIsTouched = false;
break;
}
return super.dispatchTouchEvent(ev);
}
}
In your customized MapFragment:
@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;
}
In your camera change callback method:
private final OnCameraChangeListener mOnCameraChangeListener = new OnCameraChangeListener() {
@Override
public void onCameraChange(CameraPosition cameraPosition) {
if (!mMapIsTouched) {
refreshClustering(false);
}
}
};
Answered By - AZ13
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