You can achieve the synchronized scrolling with LiveData from Android Architecture Components. Declare an interface
interface LobbyReservationHSVListener{
void updateScrollPosition(int scrollX);
}
Declare a MutableLiveData variable and implement the LobbyReservationHSVListener in your activity like below:
public class HorizontalActivity extends AppCompatActivity implements
LobbyReservationHSVListener {
MutableLiveData<Integer> hsvPosition = new MutableLiveData<Integer>();
@Override
public void updateScrollPosition(int scrollX) {
hsvPosition.setValue(scrollX);
}
}
In onCreate in your activity start observing the MutableLiveData you declared. Whenever its value changes, loop through all children views of container and update their scroll positions.
hsvPosition.observe(this,new Observer<Integer>() {
@Override
public void onChanged(Integer integer) {
for(int i=0; i<container.getChildCount();i++){
HorizontalScrollView hsv = container.getChildAt(i).findViewById(R.id.horizontal_timebar_view);
hsv.smoothScrollTo(integer,0);
}
}
});
In your LobbyReservationRowView create a function to set the LobbyReservationHSVListener object and call updateScrollPosition whenever scroll changes.
public class LobbyReservationRowView extends FrameLayout implements
OnClickListener, OnItemClickListener, HorizontalScrollView.OnScrollChangeListener {
private LobbyReservationHSVListener hsvUpdateListener;
@BindView(R.id.horizontal_timebar_view)
HorizontalScrollView mHorizontalTimeBarView;
public void setHSVUpdateListener(LobbyReservationHSVListener hsvUpdateListener){
this.hsvUpdateListener = hsvUpdateListener;
}
@Override
public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
hsvUpdateListener.updateScrollPosition(scrollX);
}
}
Don't forget to call setHSVUpdateListener(this) on your LobbyReservationRowView object whenever adding it to your container
You should get something like this:
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