Disable scrolling View Programmatically?

Question

I would like to enable ScrollView and disable it with the click of a button.
Disable means that if ScrollView was not there .. and enable it returns ScrollView.

I want this because I have a gallery with text images, and when I click the button, the screen orientation changes, so the text becomes larger in landscape orientation. And I want ScrollView so that the image does not stretch and the text becomes unreadable.

scrollview.Enabled=false/setVisibility(false) does nothing.

XML:

 <ScrollView android:id="@+id/QuranGalleryScrollView" android:layout_height="fill_parent" android:layout_width="fill_parent"> <Gallery android:id="@+id/Gallery" android:layout_width="fill_parent" android:layout_height="fill_parent" android:scrollbars="horizontal"></Gallery> </ScrollView> 

thank

Edit1: I cannot use the visibility (left), since this would also hide the gallery that I want to hide the ScrollView effect. When there is a ScrollView, the images in the Gallery become scrollable and do not fit on the screen, so you need to scroll to see the whole image, I do not want to turn it off / on at the click of a button.

I tried this:

 ((ScrollView)findViewById(R.id.QuranGalleryScrollView)).setOnTouchListener(null); ((ScrollView)findViewById(R.id.QuranGalleryScrollView)).setHorizontalScrollBarEnabled(false); ((ScrollView)findViewById(R.id.QuranGalleryScrollView)).setVerticalScrollBarEnabled(false); ((ScrollView)findViewById(R.id.QuranGalleryScrollView)).setEnabled(false); 

Nevertheless, the images in the Gallery scroll and do not fit on the screen. What is the solution?

Answer 1

A few points to start:

1. You cannot disable ScrollView scrolling. You will need to extend ScrollView and override the onTouchEvent method onTouchEvent that it returns false when any condition is met.
2. The Gallery component scrolls horizontally regardless of whether it is in ScrollView or not - ScrollView provides only vertical scrolling (horizontal scrolling is required for horizontal scrolling)
3. You seem to say that you have a problem with stretching the image itself - it has nothing to do with ScrollView, you can change the way ImageView scales from android:scaleType android:scaleType (XML) setScaleType or setScaleType method - for example, ScaleType.CENTER will not stretch your image and will center it in the original size

You can change ScrollView as follows to disable scrolling

 class LockableScrollView extends ScrollView { ... // true if we can scroll (not locked) // false if we cannot scroll (locked) private boolean mScrollable = true; public void setScrollingEnabled(boolean enabled) { mScrollable = enabled; } public boolean isScrollable() { return mScrollable; } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: // if we can scroll pass the event to the superclass return mScrollable && super.onTouchEvent(ev); default: return super.onTouchEvent(ev); } } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { // Don't do anything with intercepted touch events if // we are not scrollable return mScrollable && super.onInterceptTouchEvent(ev); } } 

Would you then use

 <com.mypackagename.LockableScrollView android:id="@+id/QuranGalleryScrollView" android:layout_height="fill_parent" android:layout_width="fill_parent"> <Gallery android:id="@+id/Gallery" android:layout_width="fill_parent" android:layout_height="fill_parent" android:scrollbars="horizontal"> </Gallery> </com.mypackagename.LockableScrollView> 

in your XML file (just ScrollView to your special LockableScrollView ).

Then call

 ((LockableScrollView)findViewById(R.id.QuranGalleryScrollView)).setScrollingEnabled(false); 

disable view scrolling.

I think that you have more than just the problem of disabling scrolling, although in order to achieve the desired result (for example, the gallery will be scrolled using the above code) - I would recommend doing some more research on each of the three components (Gallery, ScrollView, ImageView) to see what properties everyone has and how he behaves.

Answer 2

I went like this:

  scrollView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub return isBlockedScrollView; } }); 

Answer 3

Found this simple solution by simply installing

 ScrollView.requestDisallowInterceptTouchEvent(true); 

Answer 4

Disablend ScrollView

 ScrollView sw = (ScrollView) findViewById(R.id.scrollView1); sw.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return true; } }); 

Answer 5

to start, I used the code posted in the first comment, but I changed it as follows:

  public class LockableScrollView extends ScrollView { public LockableScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } public LockableScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public LockableScrollView(Context context) { super(context); } // true if we can scroll (not locked) // false if we cannot scroll (locked) private boolean mScrollable = true; public void setScrollingEnabled(boolean enabled) { mScrollable = enabled; } public boolean isScrollable() { return mScrollable; } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: // if we can scroll pass the event to the superclass if (mScrollable) return super.onTouchEvent(ev); // only continue to handle the touch event if scrolling enabled return mScrollable; // mScrollable is always false at this point default: return super.onTouchEvent(ev); } } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: // if we can scroll pass the event to the superclass if (mScrollable) return super.onInterceptTouchEvent(ev); // only continue to handle the touch event if scrolling enabled return mScrollable; // mScrollable is always false at this point default: return super.onInterceptTouchEvent(ev); } } } 

then i called it that way

 ((LockableScrollView)findViewById(R.id.scrollV)).setScrollingEnabled(false); 

because i tried

 ((LockableScrollView)findViewById(R.id.scrollV)).setIsScrollable(false); 

but he said setIsScrollable is undefined

Hope this helps you

Answer 6

Here is a simpler solution. Override onTouch() for ScrollView OnTouchListener and return false if you want to bypass scrolling by clicking. Software scrolling still works, and there is no need to extend the ScrollView class.

 mScroller.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return isScrollable; } }); 

Answer 7

I don’t have enough points to comment on the answer, but I wanted to say that the mikec answer worked for me, except that I had to change it in order to return! isScrollable, for example:

 mScroller.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return !isScrollable; } }); 

Answer 8

 @Override public boolean onInterceptTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: // if we can scroll pass the event to the superclass if (mScrollable) return super.onInterceptTouchEvent(ev); // only continue to handle the touch event if scrolling enabled return mScrollable; // mScrollable is always false at this point default: return super.onInterceptTouchEvent(ev); } } 

Answer 9

@JosephEarl +1 He has a great solution that worked fine for me with some minor changes to his programming programming.

---

Here are the small changes I made:

LockableScrollView Class:

 public boolean setScrollingEnabled(boolean enabled) { mScrollable = enabled; return mScrollable; } 

MainActivity:

 LockableScrollView sv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); sv = new LockableScrollView(this); sv.setScrollingEnabled(false); } 

Answer 10

I had a layout over NestedScrollView that used a touch event and turned off scrolling:

 progressBarLayout.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent motionEvent) { return true; } }); 

and enable:

 progressBarLayout.setOnTouchListener(null); 

Answer 11

 public class LockableScrollView extends ScrollView { private boolean mScrollable = true; public LockableScrollView(Context context) { super(context); } public LockableScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public LockableScrollView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public LockableScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } public void setScrollable(boolean enabled) { mScrollable = enabled; } public boolean isScrollable() { return mScrollable; } @Override public boolean onTouchEvent(MotionEvent ev) { return mScrollable && super.onTouchEvent(ev); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { return mScrollable && super.onInterceptTouchEvent(ev); } } 

Answer 12

Does it help?

 ((ScrollView)findViewById(R.id.QuranGalleryScrollView)).setOnTouchListener(null); 

Answer 13

You can expand the gallery and use some flag to disable scrolling if you want:

 public class MyGallery extends Gallery { public boolean canScroll; public MyGallery(Context context, AttributeSet attrs) { canScroll = true; super(context, attrs); } public void setCanScroll(boolean flag) { canScroll = flag; } @Override public boolean onScroll(android.view.MotionEvent e1, android.view.MotionEvent e2, float distanceX, float distanceY) { if (canScroll) return super.onScroll(e1,e2,distancex,distancey); else return false; } @Override public boolean onSingleTapUp(MotionEvent e) { if (canScroll) return super.onSingleTapUp(ey); else return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (canScroll) return super.onFling(e1,e2,velocityX,velocityY); else return false; } } 

Answer 14

You can create a CustomScrollView for which you can disable its interaction with other views. Although this can sometimes annoy the end user. Use it with caution.

This is the code:

 import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.ViewParent; public class CustomScrollView extends android.widget.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) { /* Prevent parent controls from stealing our events once we've gotten a touch down */ if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) { ViewParent p = getParent(); if (p != null) p.requestDisallowInterceptTouchEvent(true); } return false; } } 

How to use CustomScrollView?

You can add CustomScrollView as a parent to the screen on which you want to add another Scrollview as a child view, and the whole screen scrolls. I used this for RelativeLayout.

 <?xml version="1.0" encoding="utf-8"?> <**package.**CustomScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/some_id" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:tools="http://schemas.android.com/tools"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> #**Inside this I had a TableLayout and TableRow. Inside the TableRow,** #**I had a TextView which I made scrollable from Java Code.** #**textView.setMovementMethod(new ScrollingMovementMethod());** </RelativeLayout> </ankit.inventory.ankitarora.inventorymanagementsimple.CustomScrollView> 

It worked for my case.

Answer 15

ScrollView / HorizontalScrollView contains a private OverScroller object. You can get mScroller (this object) and call OverScroller # forceFinished. But these are private fields, and you should get them using reflections.

 private void stopScrolling(HorizontalScrollView view) { try { Class<? extends HorizontalScrollView> hsvClass = view.getClass(); Field fieldScroller = hsvClass.getDeclaredField("mScroller"); fieldScroller.setAccessible(true); OverScroller overScroller = (OverScroller) fieldScroller.get(view); overScroller.forceFinished(true); } catch (Exception e) { e.printStackTrace(); } } 

But you should be aware that using reflection in your code is dangerous. And this is a big crutch!

Answer 16

As you can see in the documentation , you cannot set the visibility to false. In your case, you should probably use:

 scrollview.setVisibility(Visibility.GONE); 

Answer 17

at the touch of a button just

 ScrollView sView = (ScrollView)findViewById(R.id.ScrollView01); sView.setVerticalScrollBarEnabled(false); sView.setHorizontalScrollBarEnabled(false); 

so that the scrollbar is not turned on when the button is pressed