How to make zoomable scrollview?

Question

In my android application I need to create activities zoom able. I found useful code for zooming linear layout here . But in my application couple of activities start with scrollview and this code does not recognize scrollview. How can I make pinch zoom for scrollable activity? This is one of my layout.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/scrollViewZoom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >

<LinearLayout
    android:id="@+id/wd_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:orientation="vertical" >

    <!-- Start Circle -->

    <TableRow
        android:id="@+id/row_circl1"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:background="@color/purple_color" >

        <RelativeLayout
            android:id="@+id/circle_layout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/white_color" >

            <ImageView
                android:id="@+id/img_engin_circle1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:background="@drawable/circle_engin_bg"
                android:contentDescription="TODO" />
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/circle_layout2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@color/white_color" >

            <ImageView
                android:id="@+id/img_engin_circle2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:background="@drawable/circle_engin_bg"
                android:contentDescription="TODO" />
        </RelativeLayout>
    </TableRow>

    <TableRow
        android:id="@+id/row_name_circle"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:layout_marginTop="30dp" >

        <RelativeLayout
            android:id="@+id/circle_name_layout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="-15dp"
            android:background="@color/white_color" >

            <ImageView
                android:id="@+id/img_name_circle1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:background="@drawable/circle_gauge_name"
                android:contentDescription="TODO" />
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/circle_name_layout2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="-15dp"
            android:background="@color/white_color" >

            <ImageView
                android:id="@+id/img_name_circle2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:background="@drawable/circle_gauge_name"
                android:contentDescription="TODO" />
        </RelativeLayout>
    </TableRow>

    <!-- End Circle -->

</LinearLayout>

</ScrollView>

Any idea would help me. Thanks.

Answer 1

Ok. After plowing the net, finally found my answer. I found onTouchEvent() for scrollview does not work so I have to use dispatchTouchEvent() instead of onTouchEvent(). At the top you can see my xml code (in my question) an here is my Activity code of course with comments.

    // step 1: add some instance
private float mScale = 1f;
private ScaleGestureDetector mScaleDetector;
GestureDetector gestureDetector;

//step 2: create instance from GestureDetector(this step sholude be place into onCreate())
gestureDetector = new GestureDetector(this, new GestureListener());

// animation for scalling
mScaleDetector = new ScaleGestureDetector(this, new ScaleGestureDetector.SimpleOnScaleGestureListener() 
    {                                   
        @Override
        public boolean onScale(ScaleGestureDetector detector) 
        {
            float scale = 1 - detector.getScaleFactor();

            float prevScale = mScale;
            mScale += scale;

            if (mScale < 0.1f) // Minimum scale condition:
                mScale = 0.1f;

            if (mScale > 10f) // Maximum scale condition:
                mScale = 10f;
            ScaleAnimation scaleAnimation = new ScaleAnimation(1f / prevScale, 1f / mScale, 1f / prevScale, 1f / mScale, detector.getFocusX(), detector.getFocusY());
            scaleAnimation.setDuration(0);
            scaleAnimation.setFillAfter(true);
            ScrollView layout =(ScrollView) findViewById(R.id.scrollViewZoom);
            layout.startAnimation(scaleAnimation);
            return true;
        }
    });


// step 3: override dispatchTouchEvent()
 @Override
 public boolean dispatchTouchEvent(MotionEvent event) {
    super.dispatchTouchEvent(event);
    mScaleDetector.onTouchEvent(event);
    gestureDetector.onTouchEvent(event);
    return gestureDetector.onTouchEvent(event);
 }

//step 4: add private class GestureListener

private class GestureListener extends GestureDetector.SimpleOnGestureListener {
    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }
    // event when double tap occurs
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        // double tap fired.
        return true;
    }
}

Thanks a lot.