MapView inside a ScrollView?

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!

Solution 1:

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:

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:

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:

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