r3dm4n r3dm4n - 5 days ago 7
Android Question

Enable panning on Google Maps and disable scrolling (inside a CoordinatorLayout)

When I try to pan the google map, the CoordinatorLayout scrolls down, and of course I want to pan the map instead.
If I hold outside the Map and then try to pan then it works perfectly, but that wouldn't be a very good end user experience.

The OnTouchListener fixes part of the problem... but only if I pan horizontally. The moment my finger goes up or down it stops panning the map.
How can I fix this?

public class HomeFragment extends Fragment {

private TextView aboutTxt;
private SupportMapFragment mSupportMapFragment;
private GoogleMap mMap;
public HomeFragment() {
// Required empty public constructor
}


// TODO: Rename and change types and number of parameters
public static HomeFragment newInstance() {
HomeFragment fragment = new HomeFragment();

return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {

}
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_home, container, false);


view.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {



if (event.getAction()==MotionEvent.ACTION_DOWN) {

Log.e(TAG,"Down");
return true;
}

if (event.getAction()==MotionEvent.ACTION_MOVE){

Log.e(TAG,"Move");
return true;

}
if (event.getAction()==MotionEvent.ACTION_UP){

Log.e(TAG,"Up");
return true;
}


return false;
}
});



mSupportMapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
if (mSupportMapFragment == null) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
mSupportMapFragment = SupportMapFragment.newInstance();
fragmentTransaction.replace(R.id.map, mSupportMapFragment).commit();
}

if (mSupportMapFragment != null) {
mSupportMapFragment.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap googleMap) {
if (googleMap != null) {

mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

// Add a marker in Sydney and move the camera
LatLng myMap = new LatLng(xx.xxxx, xx.xxxx);
mMap.addMarker(new MarkerOptions().position(gradiMap).title("My marker));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myMap, 17));

}


}
});
}


XML





<android.support.design.widget.AppBarLayout
android:id="@+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">

<FrameLayout
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax" />


<android.support.v7.widget.Toolbar
android:id="@+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>

<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<TextView
android:id="@+id/aboutTxt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lineSpacingExtra="8dp"
android:padding="@dimen/activity_horizontal_margin"
android:textColor="@color/colorBlack"
android:textSize="17sp" />

</android.support.v4.widget.NestedScrollView>

<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/activity_horizontal_margin"
android:src="@drawable/whitestar"
app:layout_anchor="@id/main.appbar"
app:layout_anchorGravity="bottom|right|end" />



Answer

Found the answer here. Like Teimoor Alam Khan said, just make a custom class and use that.

public class CustomScrollView extends ScrollView {

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

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

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

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action) {
    case MotionEvent.ACTION_DOWN:
        //Log.i("CustomScrollView", "onInterceptTouchEvent: DOWN super false" );
        super.onTouchEvent(ev);
        break;

    case MotionEvent.ACTION_MOVE:
        return false; // redirect MotionEvents to ourself

    case MotionEvent.ACTION_CANCEL:
        // Log.i("CustomScrollView", "onInterceptTouchEvent: CANCEL super false" );
        super.onTouchEvent(ev);
        break;

    case MotionEvent.ACTION_UP:
        //Log.i("CustomScrollView", "onInterceptTouchEvent: UP super false" );
        return false;

    default:
        //Log.i("CustomScrollView", "onInterceptTouchEvent: " + action );
        break;
}

return false;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
super.onTouchEvent(ev);
//Log.i("CustomScrollView", "onTouchEvent. action: " + ev.getAction() );
return true;
  }
}

XML:

<com.app.ui.views.CustomScrollView
android:id="@+id/scrollView"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:orientation="vertical">
</com.app.ui.views.CustomScrollView>
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