Android - zoom in/out RelativeLayout with spread/pinch

Question

I have an activity with a RelativeLayout and a private class in it, which extends the SimpleOnScaleGestureListener. In the onScale method of the listener I'd like to zoom in/out of the whole layout (everything the user sees) with the user spreading/pinching his fingers.

I'd like the changes to the layout NOT to be permanent, i.e. when the spread/pinch gesture is over I'd like the layout to go back to what it was in first place (any resetting could be done in the onScaleEnd method of the SimpleOnScaleGestureListener for example).

I've tried to implement it via calling setScaleX and setScaleY on the RelativeLayout and also by using a ScaleAnimation. Neither resulted in smooth zooming (or anything that could at all be called zooming). Is it even possible to zoom in/out a RelativeLayout?

The only idea I have left would be reading a screenshot from the cache and putting it as an ImageView on top of the whole layout and the zoom in/out of this image via setImageMatrix. I have no clue, however, how to implement this.

May layout also contains a container for a fragment, which is empty at the time the zooming is supposed to be possible. In the onScaleEnd gesture, the fragment is put into it's container (already implemented and working fine). Here is my layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_pinch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff" >   


<!-- Layout containing the thumbnail ImageViews -->
<LinearLayout
    android:id="@+id/thumbnail_group_pui"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c1"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c2"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c3"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c4"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c5"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c6"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/tn_c7"/>

</LinearLayout>


<!-- Layout containing the dashed boxes -->
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="152dp"
    android:layout_centerVertical="true"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

   <ImageView
        android:layout_width="177dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="3dp"
        android:layout_marginRight="3dp"
        android:background="@drawable/dashed_box"/>

</LinearLayout>


<!-- Container for the fragments -->
<FrameLayout
    android:id="@+id/fragment_container_pui"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />


</RelativeLayout>

EDIT I found these two related topics:
Extending RelativeLayout, and overriding dispatchDraw() to create a zoomable ViewGroup
Zoom Content in a RelativeLayout

I did not get the implementation, however. What other methods do I have to include in the extended class to actually scale the layout or reset it?

to zoom a layout how do we use `ZoomableRelativeLayout`? Do i need to pass my view as a parameter to its constructor? — mushahid, Aug 10 '15 at 08:12

score 32 · Accepted Answer · edited Feb 13 '14 at 12:16

32

So I created a subclass of RelativeLayout as described in the above mentioned topics. It looks like this:

public class ZoomableRelativeLayout extends RelativeLayout {
float mScaleFactor = 1;
float mPivotX;
float mPivotY;

public ZoomableRelativeLayout(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
}

public ZoomableRelativeLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
}

public ZoomableRelativeLayout(Context context, AttributeSet attrs,
        int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
}

protected void dispatchDraw(Canvas canvas) {
    canvas.save(Canvas.MATRIX_SAVE_FLAG);
    canvas.scale(mScaleFactor, mScaleFactor, mPivotX, mPivotY);
    super.dispatchDraw(canvas);
    canvas.restore();
}

public void scale(float scaleFactor, float pivotX, float pivotY) {
    mScaleFactor = scaleFactor;
    mPivotX = pivotX;
    mPivotY = pivotY;
    this.invalidate();
}

public void restore() {
    mScaleFactor = 1;
    this.invalidate();
}

}

My implementation of the SimpleOnScaleGestureListener looks like this:

private class OnPinchListener extends SimpleOnScaleGestureListener {

    float startingSpan; 
    float endSpan;
    float startFocusX;
    float startFocusY;


    public boolean onScaleBegin(ScaleGestureDetector detector) {
        startingSpan = detector.getCurrentSpan();
        startFocusX = detector.getFocusX();
        startFocusY = detector.getFocusY();
        return true;
    }


    public boolean onScale(ScaleGestureDetector detector) {
        mZoomableRelativeLayout.scale(detector.getCurrentSpan()/startingSpan, startFocusX, startFocusY);
        return true;
    }

    public void onScaleEnd(ScaleGestureDetector detector) {
        mZoomableRelativeLayout.restore();
    }
}

Hope this helps!

Update:

You can integrate OnPinchListener for your ZoomableRelativelayout by using ScaleGestureDetector:

ScaleGestureDetector scaleGestureDetector = new ScaleGestureDetector(this, new OnPinchListener());

And you are required to bind touch listener of Zoomable layout with the touch listener of ScaleGestureDetector:

mZoomableLayout.setOnTouchListener(new OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    // TODO Auto-generated method stub
                    scaleGestureDetector.onTouchEvent(event);
                    return true;
                }
            });

edited Feb 13 '14 at 12:16

Paresh Mayani

127,700
71
241
295

answered Apr 05 '12 at 13:14

Schnodahipfe

1,053
1
13
20

2

how to apply this `OnPinchListener` to RelativeLayout. – Herry May 18 '12 at 06:43
To apply onPinchListner I think you need to implement onTouch where you need to specify mOnPinchListener.onTouchEvent(ev); – kendrelaxman Oct 17 '12 at 08:27
what mZoomableRelativeLayout variable means? – Iulia Barbu Feb 07 '13 at 11:44
It's the ZoomableRelativeLayout instance – Schnodahipfe Apr 08 '13 at 12:36
hi thanks @Schnodahipfe can u please tell me how to implement OnPinchListener to RelativeLayout – Dilip May 25 '13 at 07:11
@Schnodahipfe Your solution only scales the canvas and not the View itself. You need to transform all the touch points and clip rects of the children for it to be complete. what bugs is that setScaleX/Y does that for you but i stymied as to why the zoom is not smooth. – numan salati Jul 02 '13 at 20:37
2

It seems many are having queries regarding implementing OnPinchListener for ZoomableRelativeLayout and for the same I have **updated code**! Cheers – Paresh Mayani Feb 13 '14 at 12:18
3

@Schnodahipfe : I implemented your above classes, and the relative layout is zooming perfect. But I want to hold the zoomed out/in view after removing fingers from screen. So for this I remove the " mZoomableRelativeLayout.restore();" from "onScaleEnd" function. This works perfect. But problem is the touch of the elements in that relative layout doesn't get update, as they still remains at the position when they are present when "mScaleFactor" of relative layout is 1. Please Help....Need to update touches of buttons inside relative layout along with zoom in/out. – Navjot May 29 '14 at 07:36
how to apply move event to this custom relative view – Binod Singh Aug 14 '14 at 06:37
Do I need to create the OnPinchListener in ZoomableRelativeLayout and how zoomableRelativeLayout Object is created? – Mohammed Rampurawala Aug 14 '14 at 06:54
Awesome Functionality.. Done with my Relative Layout – Mohammed Rampurawala Aug 14 '14 at 07:20
Pinch zoom in/out not working properly. When I try to pinch zoom in/out its like zooming in something and going back to normal. – AndroidDev Aug 21 '14 at 12:28
how to restrict zoom out or zoom in @PareshMayani – Rishabh Srivastava Apr 13 '15 at 13:19
I found out if (detector.getCurrentSpan() <= startingSpan) { relMain.scale(detector.getCurrentSpan() / startingSpan, startFocusX, startFocusY); } – Rishabh Srivastava Apr 13 '15 at 13:30
how to pass the Layout i want to zoom to this class? – mushahid Aug 11 '15 at 06:11
grabbing a hold of startingSpan and later dividing for the scale just saved my day. thank you. – imnk Sep 25 '15 at 08:15
@NavjotBedi can you or Schnodahipfe share your xml and activity snippet, because i tried this approach but couldn't even get the error free compilation. I need this thing badly so please if you can share this thing, it will be highly appreciated. Thanks. – Umair Jul 03 '16 at 13:09
how it goes with my Activity? Relative layout has many views and it is a part of the activity. How `layout_pinch` will be zoomed by using `ZoomableRelativeLayout` ???? – Prabs Apr 12 '17 at 08:46
@Schnodahipfe , If you don't want your layout to restore, simply comment the line thats says mZoomableRelativeLayout.restore(); in the OnPinchListener class. excellnt answer – Amin Keshavarzian May 04 '18 at 20:47
1

This is not making zoom again from the same size(zoomed value which already zoomed by pinching) of the layout, its pinching works perfect.Please tell me what should i update in this code do so ? – Md Aman Nov 30 '20 at 18:23

score 19 · Answer 2 · edited Dec 01 '20 at 23:54

Create class called Zoomlayout which extends any layout that you want to zoom in my case it is Relative Layout.

public class ZoomLayout extends RelativeLayout implements ScaleGestureDetector.OnScaleGestureListener {

private enum Mode {
   NONE,
   DRAG,
   ZOOM
 }

 private static final String TAG = "ZoomLayout";
 private static final float MIN_ZOOM = 1.0f;
 private static final float MAX_ZOOM = 4.0f;

 private Mode mode = Mode.NONE;
 private float scale = 1.0f;
 private float lastScaleFactor = 0f;

 // Where the finger first  touches the screen
 private float startX = 0f;
 private float startY = 0f;

 // How much to translate the canvas
 private float dx = 0f;
 private float dy = 0f;
 private float prevDx = 0f;
 private float prevDy = 0f;

 public ZoomLayout(Context context) {
   super(context);
   init(context);
 }

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

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

 public void init(Context context) {
   final ScaleGestureDetector scaleDetector = new ScaleGestureDetector(context, this);
   this.setOnTouchListener(new OnTouchListener() {
     @Override
     public boolean onTouch(View view, MotionEvent motionEvent) {
       switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
         case MotionEvent.ACTION_DOWN:
           Log.i(TAG, "DOWN");
           if (scale > MIN_ZOOM) {
             mode = Mode.DRAG;
             startX = motionEvent.getX() - prevDx;
             startY = motionEvent.getY() - prevDy;
           }
           break;
         case MotionEvent.ACTION_MOVE:
           if (mode == Mode.DRAG) {
             dx = motionEvent.getX() - startX;
             dy = motionEvent.getY() - startY;
           }
           break;
         case MotionEvent.ACTION_POINTER_DOWN:
           mode = Mode.ZOOM;
           break;
         case MotionEvent.ACTION_POINTER_UP:
           mode = Mode.DRAG;
           break;
         case MotionEvent.ACTION_UP:
           Log.i(TAG, "UP");
           mode = Mode.NONE;
           prevDx = dx;
           prevDy = dy;
           break;
       }
       scaleDetector.onTouchEvent(motionEvent);

       if ((mode == Mode.DRAG && scale >= MIN_ZOOM) || mode == Mode.ZOOM) {
         getParent().requestDisallowInterceptTouchEvent(true);
         float maxDx = (child().getWidth() - (child().getWidth() / scale)) / 2 * scale;
         float maxDy = (child().getHeight() - (child().getHeight() / scale))/ 2 * scale;
         dx = Math.min(Math.max(dx, -maxDx), maxDx);
         dy = Math.min(Math.max(dy, -maxDy), maxDy);
         Log.i(TAG, "Width: " + child().getWidth() + ", scale " + scale + ", dx " + dx
           + ", max " + maxDx);
         applyScaleAndTranslation();
       }

       return true;
     }
   });
 }

 // ScaleGestureDetector

 @Override
 public boolean onScaleBegin(ScaleGestureDetector scaleDetector) {
   Log.i(TAG, "onScaleBegin");
   return true;
 }

 @Override
 public boolean onScale(ScaleGestureDetector scaleDetector) {
   float scaleFactor = scaleDetector.getScaleFactor();
   Log.i(TAG, "onScale" + scaleFactor);
   if (lastScaleFactor == 0 || (Math.signum(scaleFactor) == Math.signum(lastScaleFactor))) {
     scale *= scaleFactor;
     scale = Math.max(MIN_ZOOM, Math.min(scale, MAX_ZOOM));
     lastScaleFactor = scaleFactor;
   } else {
     lastScaleFactor = 0;
   }
   return true;
 }

 @Override
 public void onScaleEnd(ScaleGestureDetector scaleDetector) {
   Log.i(TAG, "onScaleEnd");
 }

 private void applyScaleAndTranslation() {
   child().setScaleX(scale);
   child().setScaleY(scale);
   child().setTranslationX(dx);
   child().setTranslationY(dy);
 }

 private View child() {
   return getChildAt(0);
 }

}

After this add ZoomLayout in xml that has only one child.For example

<?xml version="1.0" encoding="utf-8"?>
<com.focusmedica.digitalatlas.headandneck.ZoomLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:id="@+id/zoomLayout"
    android:background="#000000"
    android:layout_height="match_parent">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<TextView
    android:paddingTop="5dp"
    android:textColor="#ffffff"
    android:text="Heading"
    android:gravity="center"
    android:textAlignment="textStart"
    android:paddingLeft="5dp"
    android:textSize="20sp"
    android:textStyle="bold"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/tvSubtitle2"
    android:layout_toLeftOf="@+id/ivOn"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<ImageView
    android:id="@+id/ivOff"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:src="@drawable/off_txt"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

<ImageView
    android:id="@+id/ivOn"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:src="@drawable/on_txt"
    android:layout_alignParentTop="true"
    android:layout_alignLeft="@+id/pinOn"
    android:layout_alignStart="@+id/pinOn" />

<ImageView
    android:id="@+id/pinOff"
    android:visibility="invisible"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:src="@drawable/pin_off"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

<ImageView
    android:id="@+id/pinOn"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:src="@drawable/pin_on"
    android:layout_alignParentTop="true"
    android:layout_toLeftOf="@+id/ivOff"
    android:layout_toStartOf="@+id/ivOff" />

<RelativeLayout
    android:id="@+id/linear"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true">

<ImageView
    android:src="@drawable/wait"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:id="@+id/fullIVideo"/>

    <ImageView
        android:src="@drawable/wait"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:id="@+id/colorCode"/>

    <ImageView
        android:src="@drawable/wait"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:id="@+id/labelText"/>

<ImageView
    android:src="@drawable/download"
    android:layout_marginTop="91dp"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:id="@+id/label_play"
    android:layout_alignTop="@+id/fullIVideo"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />
    </RelativeLayout>

<LinearLayout
    android:orientation="vertical"
    android:id="@+id/custom_toast_layout"
    android:layout_width="300dp"
    android:layout_above="@+id/up"
    android:background="@drawable/rectangle_frame"
    android:paddingLeft="10dp"
    android:paddingBottom="10dp"
    android:paddingTop="10dp"
    android:paddingRight="10dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:layout_height="wrap_content">

    <TextView
        android:textSize="15sp"
        android:textColor="#ffffff"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Medium Text"
        android:id="@+id/tvLabel" />

    <TextView
        android:textColor="#ffffff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:text="New Text"
        android:layout_gravity="center"
        android:id="@+id/tvLabelDescription" />
</LinearLayout>

<ImageView
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:src="@drawable/up"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:id="@+id/up" />
    </RelativeLayout>
</com.focusmedica.digitalatlas.headandneck.ZoomLayout>

Now in MainActivity create object of ZoomLayout and define id.Like

ZoomLayout zoomlayout= findViewbyId(R.id.zoomLayout);
zoomlayout.setOnTouchListener(FullScreenVideoActivity.this);
 public boolean onTouch(View v, MotionEvent event) {
     linear.init(FullScreenVideoActivity.this);
     return false;
 }

what is linear in this line linear.init(FullScreenVideoActivity.this); — AwaisMajeed, Apr 11 '17 at 06:40
I don't think you need init call inside on touch it also works when it is outside bellow findViewById — uberchilly, Sep 27 '19 at 18:45
How to temporarily disable this zoom feature programatically without removing it from layout? — ashishdhiman2007, Nov 04 '20 at 09:49
Is it possible to put some child view on some fix cordinate position without zooming — Dhaval Solanki, Jan 23 '23 at 11:40

score 6 · Answer 3 · answered Nov 05 '14 at 22:02

I think I managed to improve Schnodahipfe's answer a little bit. I added two methods to the ZoomableRelativeLayout class.

public void relativeScale(float scaleFactor, float pivotX, float pivotY)
{
    mScaleFactor *= scaleFactor;

    if(scaleFactor >= 1)
    {
        mPivotX = mPivotX + (pivotX - mPivotX) * (1 - 1 / scaleFactor);
        mPivotY = mPivotY + (pivotY - mPivotY) * (1 - 1 / scaleFactor);
    }
    else
    {
        pivotX = getWidth()/2;
        pivotY = getHeight()/2;

        mPivotX = mPivotX + (pivotX - mPivotX) * (1 - scaleFactor);
        mPivotY = mPivotY + (pivotY - mPivotY) * (1 - scaleFactor);
    }

    this.invalidate();
}

public void release()
{
    if(mScaleFactor < MIN_SCALE)
    {
        final float startScaleFactor = mScaleFactor;

        Animation a = new Animation()
        {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t)
            {
                scale(startScaleFactor + (MIN_SCALE - startScaleFactor)*interpolatedTime,mPivotX,mPivotY);
            }
        };

        a.setDuration(300);
        startAnimation(a);
    }
    else if(mScaleFactor > MAX_SCALE)
    {
        final float startScaleFactor = mScaleFactor;

        Animation a = new Animation()
        {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t)
            {
                scale(startScaleFactor + (MAX_SCALE - startScaleFactor)*interpolatedTime,mPivotX,mPivotY);
            }
        };

        a.setDuration(300);
        startAnimation(a);
    }
}

and rewrote the OnPinchListener class like this

private class OnPinchListener extends ScaleGestureDetector.SimpleOnScaleGestureListener
{
    float currentSpan;
    float startFocusX;
    float startFocusY;

    public boolean onScaleBegin(ScaleGestureDetector detector)
    {
        currentSpan = detector.getCurrentSpan();
        startFocusX = detector.getFocusX();
        startFocusY = detector.getFocusY();
        return true;
    }

    public boolean onScale(ScaleGestureDetector detector)
    {
        ZoomableRelativeLayout zoomableRelativeLayout= (ZoomableRelativeLayout) ImageFullScreenActivity.this.findViewById(R.id.imageWrapper);

        zoomableRelativeLayout.relativeScale(detector.getCurrentSpan() / currentSpan, startFocusX, startFocusY);

        currentSpan = detector.getCurrentSpan();

        return true;
    }

    public void onScaleEnd(ScaleGestureDetector detector)
    {
        ZoomableRelativeLayout zoomableRelativeLayout= (ZoomableRelativeLayout) ImageFullScreenActivity.this.findViewById(R.id.imageWrapper);

        zoomableRelativeLayout.release();
    }
}

The original answer would reset the scale every time the touch event ended, but like this you can zoom in and out multiple times.

I suggest using 1.0f for MIN_SCALE. I used 20.0f on MAX_SCALE, but this depends on what you want to do. — Douglas Vanny, Jun 09 '15 at 02:42
It's a timeline for a video editor and I want users be able to zoom in and out vertically and horizontally. So I should find the write number for MIN_SCALE and MAX_SCALE experimentally, am I right? — Eftekhari, Jun 09 '15 at 09:04
how do i pass the relative layout to ZoomableRelativeLayout? — mushahid, Aug 10 '15 at 11:28

score 3 · Answer 4 · edited Jul 22 '22 at 04:52

3

for fragments you just need to pass getActivity() instead of Activity Name

final ZoomLayout zoomlayout = (ZoomLayout) findViewById(R.id.zoomLayout);
zoomlayout.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        zoomlayout.init(getActivity());
        return false;
    }
});

edited Jul 22 '22 at 04:52

Saeed Zhiany

2,051
9
30
41

answered Nov 23 '16 at 17:13

Brian Begun

509
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24

Not working for me. No compilation errors and no crash but pinch to zoom just do nothing. I'm using it in a fragment just the way it describes here. Any help? – Diego Perez Jun 13 '17 at 10:13
@Ashish Kumar Pal pinch to zoom not working .@Diego Perez did u got answer? – Jithish P N Nov 23 '17 at 11:52

Android - zoom in/out RelativeLayout with spread/pinch

4 Answers4

Update:

Linked

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