MapView inside a ScrollView?

Question

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 scr

Answer 1

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.

Answer 2

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);
    }
}

Answer 3

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);
        }
}

Answer 4

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)
    }
}

Answer 5

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

Answer 6

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"
                />