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androidgoogle-mapsmapstouchgoogle-maps-api-2

Google Maps Android API v2 - detect touch on map


I can't find an example on how to intercept the map touch on the new Google Maps API v2.

I need to know when the user touches the map in order to stop a thread (the centering of the map around my current location).


Solution

  • @ape wrote an answer here on how to intercept the map clicks, but I need to intercept the touches, and then he suggested the following link in a comment of its answer, How to handle onTouch event for map in Google Map API v2?.

    That solution seems to be a possible workaround, but the suggested code was incomplete. For this reason I rewrote and tested it, and now it works.

    Here it is the working code:

    I created the class 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;
        }
    }
    

    I even created the class 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);
        }
    }
    

    In the layout I declare it this way:

    <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"
    />
    

    Just for test in the main Activity I wrote only the following:

    public class MainActivity extends FragmentActivity {
        public static boolean mMapIsTouched = false;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
    }