MapView inside a ScrollView?

AndroidGoogle MapsAndroid Maps

Android Problem Overview

I would like to have a MapView inside a ScrollView, however when I try to scroll the map, the ScrollView takes priority! Is there a way to give the MapView priority when scrolling inside the map, and the ScrollView otherwise?

Thanks!

Android Solutions

Solution 1 - Android

I have had a same problem for 10 days, but I got a solution a few minutes ago!! Here is the solution. I made a custom MapView and override onTouchEvent() like this.

@Override
public boolean onTouchEvent(MotionEvent ev) {
	int action = ev.getAction();
	switch (action) {
	case MotionEvent.ACTION_DOWN:
		// Disallow ScrollView to intercept touch events.
		this.getParent().requestDisallowInterceptTouchEvent(true);
		break;
		
	case MotionEvent.ACTION_UP:
		// Allow ScrollView to intercept touch events.
		this.getParent().requestDisallowInterceptTouchEvent(false);
		break;
	}

	// Handle MapView's touch events.
	super.onTouchEvent(ev);
	return true;
}

Solution 2 - Android

A better/simpler way to do this without manipulating individual touch events. This will work if you are using MapView:

  @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        /**
         * Request all parents to relinquish the touch events
         */
        getParent().requestDisallowInterceptTouchEvent(true);
        return super.dispatchTouchEvent(ev);
    }

Full class:

public class CustomMapView extends MapView {

    public CustomMapView(Context context) {
        super(context);
    }

    public CustomMapView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomMapView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CustomMapView(Context context, GoogleMapOptions options) {
        super(context, options);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        /**
         * Request all parents to relinquish the touch events
         */
        getParent().requestDisallowInterceptTouchEvent(true);
        return super.dispatchTouchEvent(ev);
    }
}

If you are using a MapFragment then you can put the fragment in a Custom View, and in the dispatchTouchEvent() make the requestDisallowInterceptTouchEvent call.

Solution 3 - Android

Make your own map and use it. It works fully for me.

public class CustomMapView extends MapView {

public CustomMapView(Context context, AttributeSet attrs) {
	super(context, attrs);
}

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
	switch (ev.getAction()) {
	case MotionEvent.ACTION_UP:
		System.out.println("unlocked");
		this.getParent().requestDisallowInterceptTouchEvent(false);
		break;
	case MotionEvent.ACTION_DOWN:
		System.out.println("locked");
		this.getParent().requestDisallowInterceptTouchEvent(true);
		break;
	}
	return super.dispatchTouchEvent(ev);
}}

In your layout xml,

<com.yourpackage.xxxx.utils.CustomMapView
                android:id="@+id/customMap"
                android:layout_width="match_parent"
                android:layout_height="400dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                />

Solution 4 - Android

For those who want the whole working code . here it is

Custom map view class

public class CustomMapView extends MapView {

private ViewParent mViewParent;
public CustomMapView(Context context) {
    super(context);
}

public CustomMapView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomMapView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

public CustomMapView(Context context, GoogleMapOptions options) {
    super(context, options);
}

public void setViewParent(@Nullable final ViewParent viewParent) { //any ViewGroup
    mViewParent = viewParent;
}

@Override
public boolean onInterceptTouchEvent(final MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            if (null == mViewParent) {
                getParent().requestDisallowInterceptTouchEvent(true);
            } else {
                mViewParent.requestDisallowInterceptTouchEvent(true);
            }
            break;
        case MotionEvent.ACTION_UP:
            if (null == mViewParent) {
                getParent().requestDisallowInterceptTouchEvent(false);
            } else {
                mViewParent.requestDisallowInterceptTouchEvent(false);
            }
            break;
        default:
            break;
    }

    return super.onInterceptTouchEvent(event);
  }
}

Activity layout xml

  <ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <location.to.your.CustomMapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="250dp"
         />
    
</ScrollView>

Instantiating the custom map class in your activity or fragment

       CustomMapView mapView = (CustomMapView) findViewById(R.id.mapView);

That's it enjoy

Solution 5 - Android

You can create a custom MapView like this:

public class CustomMapView extends MapView {

    private MapFragment.ControlLock mCallbackControl;

    public CustomMapView(Context context) {
        this(context, null);
    }

    public CustomMapView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomMapView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CustomMapView(Context context, GoogleMapOptions options) {
        super(context, options);
    }

    public void setCallback(MapFragment.ControlLock callbackControl) {
        this.mCallbackControl = callbackControl;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_UP:
                System.out.println("unlocked");
                mCallbackControl.unlock(); /* Interface */
                break;
            case MotionEvent.ACTION_DOWN:
                System.out.println("locked");
                mCallbackControl.lock(); /* Interface */
                break;
        }

        return super.dispatchTouchEvent(event);
    }
}

Solution 6 - Android

I've tried with overriding MapView.onTouchEvent(...), but it didn't work for me. Here is code which works well (overriding MapView.onInterceptTouchEvent(...)):

public class MyMapView extends MapView {
    private ViewParent mViewParent;

//add constructors here
    
    public void setViewParent(@Nullable final ViewParent viewParent) { //any ViewGroup
            mViewParent = viewParent;
    }
    
    @Override
        public boolean onInterceptTouchEvent(final MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    if (null == mViewParent) {
                        getParent().requestDisallowInterceptTouchEvent(true);
                    } else {
                        mViewParent.requestDisallowInterceptTouchEvent(true);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (null == mViewParent) {
                        getParent().requestDisallowInterceptTouchEvent(false);
                    } else {
                        mViewParent.requestDisallowInterceptTouchEvent(false);
                    }
                    break;
                default:
                    break;
            }
    
            return super.onInterceptTouchEvent(event);
        }
}

Solution 7 - Android

You can simply put the MapView in a Layout itself and override onTouch or set an Click-Listener - easiest way for me since i needed a touch on the whole MapView in my ScrollView.

Solution 8 - Android

If you have mapview in scroll view then you have to explicity mention the follwing paramets to the MapView:

mMapView.setClickable(true);
mMapView.setFocusable(true);
mMapView.setDuplicateParentStateEnabled(false);

Solution 9 - Android

If somebody wants this class in kotlin.
I used dispatchTouchEvent like suggested by @rotem

class CustomMapView : MapView {
           constructor(context: Context):
            super(context)
    constructor(context: Context, googleMapOptions: GoogleMapOptions):
            super(context, googleMapOptions)
    constructor(context: Context, attributeSet: AttributeSet):
            super(context, attributeSet)
    constructor(context: Context, attributeSet: AttributeSet, int: Int):
            super(context, attributeSet, int)

    override fun dispatchTouchEvent(event: MotionEvent?): Boolean {
        Log.d("CustomWebView", "touchevent")
        when(event?.action) {
            MotionEvent.ACTION_UP -> {
                Log.d("CustomWebView", "disallow Intercept")
                parent.requestDisallowInterceptTouchEvent(false)
            }
            MotionEvent.ACTION_DOWN -> {
                Log.d("CustomWebView", "allow Intercept")
                parent.requestDisallowInterceptTouchEvent(true)
            }
        }
        return super.dispatchTouchEvent(event)
    }
}
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