如何检测滚动的滚动视图

Question

I had a view with multiple scroll view so my question is how to detect which scroll view is scrolled?

For example if I had 3 vertical scroll view, how to know which scroll is scrolled by the user?

this is my code:

public void fillFormules(List<Category> objectsTextToShow)
{
    LinearLayout layoutItemDetail = (LinearLayout) view.findViewById(R.id.middle);
    LinearLayout relativeLayout = (LinearLayout) view.findViewById(R.id.titles);

     LinearLayout layout = new LinearLayout(getActivity());
    layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    layout.setOrientation(LinearLayout.HORIZONTAL);
     ScrollView scrollView = null;
    for (int j = 0; j <objectsTextToShow.size() ; j++){

        TextView textCat = new TextView(getActivity());
        textCat.setText(Check.Languages(objectsTextToShow.get(j).getName(), LANGUAGE_ID));
        textCat.setTextSize(24);
        textCat.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1f));
        textCat.setTextColor(colorUtils.TITLE);
        textCat.setGravity(Gravity.CENTER);

        relativeLayout.addView(textCat);
        textCat.setBackgroundColor(colorUtils.backgroundColor);
        LinearLayout parentLayout = new LinearLayout(getActivity());
        parentLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, (float) 1.0));
        parentLayout.setOrientation(LinearLayout.VERTICAL);
        scrollView = new ScrollView(getActivity());
        scrollView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, (float) 1.0));


        for (int i = 0; i <objectsTextToShow.get(j).getItems().size() ; i++)

                {
                    TextView textView = new TextView(getActivity());
                    textView.setTextSize(24);

                    textView.setText(Check.Languages(objectsTextToShow.get(j).getItems().get(i).getName(), LANGUAGE_ID));

                    textView.setTextColor(colorUtils.TITLE);
                    LinearLayout separator = new LinearLayout(getActivity());
                    separator.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 100));
                    parentLayout.addView(separator);
                    parentLayout.addView(textView);
                }
        scrollView.setVisibility(View.VISIBLE);
        scrollView.addView(parentLayout);
        layout.addView(scrollView);
    }
    layoutItemDetail.addView(layout);
}

Answer 1

Wherever you want to know it, you'll be in some callback, that will get a View argument passed to it. That's the view in question, or maybe view.getParent().

scrollView = new ScrollView(getActivity());
// add a tag to each scrollView. It can be any Object, I'll use the
// the `j` index from the for
scrollView.setTag(Integer.valueOf(j));

scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
    @Override
    public void onScrollChanged() {
        onScrollViewScrolled(finalScrollView);
    }

    public void onScrollViewScrolled(ScrollView scroll) {
        height = 10; // or view.getHeight();
        scroll.scrollTo(0, height);
        // scroll.getTag() returns the object we set by setTag()
        Log.e("j: " + scroll.getTag() + ", id : "+scroll.getId(),"height: "+height);
    }
});

Answer 2

You can do something like this:

mScrollView.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener() {

    @Override
    public void onScrollChanged() {
        onScrollViewScrolled(mScrollView.getId());
    }
});

You will get notified when someone scroll mScrollView . Inside the callback you get the ID of the scrolled view and pass it to onScrollViewScrolled . This way you will know the ID of the scrolled view.

Answer 3

the problem was in scrollview declaration

    public void fillFormules(List<Category> objectsTextToShow) {
    LinearLayout layoutItemDetail = (LinearLayout) view.findViewById(R.id.middle);
    LinearLayout relativeLayout = (LinearLayout) view.findViewById(R.id.titles);

     LinearLayout layout = new LinearLayout(getActivity());
    layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    layout.setOrientation(LinearLayout.HORIZONTAL);
     **ScrollView scrollView = null;**
    for (int j = 0; j <objectsTextToShow.size() ; j++){

        TextView textCat = new TextView(getActivity());
        textCat.setText(Check.Languages(objectsTextToShow.get(j).getName(), LANGUAGE_ID));
        textCat.setTextSize(24);
        textCat.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1f));
        textCat.setTextColor(colorUtils.TITLE);
        textCat.setGravity(Gravity.CENTER);

        relativeLayout.addView(textCat);
        textCat.setBackgroundColor(colorUtils.backgroundColor);
        LinearLayout parentLayout = new LinearLayout(getActivity());
        parentLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, (float) 1.0));
        parentLayout.setOrientation(LinearLayout.VERTICAL);
        *ScrollView* scrollView = new ScrollView(getActivity());
        scrollView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, (float) 1.0));


        for (int i = 0; i <objectsTextToShow.get(j).getItems().size() ; i++)

                {
                    TextView textView = new TextView(getActivity());
                    textView.setTextSize(24);

                    textView.setText(Check.Languages(objectsTextToShow.get(j).getItems().get(i).getName(), LANGUAGE_ID));

                    textView.setTextColor(colorUtils.TITLE);
                    LinearLayout separator = new LinearLayout(getActivity());
                    separator.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 100));
                    parentLayout.addView(separator);
                    parentLayout.addView(textView);


                }


        scrollView.setVisibility(View.VISIBLE);
        scrollView.addView(parentLayout);
        layout.addView(scrollView);


    }
    layoutItemDetail.addView(layout);


}

it works now, thank you guys !