How can I limit fling in Android gallery to just one item per fling?

Question

I have a gallery with several full screen images. I want to limit the fling gesture to only advance one image at a time (like the HTC Gallery app). What's the right/easiest way to achieve this?

Here is another possible answer! http://stackoverflow.com/questions/2373617/how-to-stop-scrolling-in-a-gallery-widget?lq=1 — Lunf, Mar 26 '13 at 15:38

olen_garn · Accepted Answer · 2012-04-22T02:43:44.083

27

Simply override the Gallery Widget's onFling() method and don't call the superclass onFling() method.

This will make the gallery advance one item per swipe.

edited Apr 22 '12 at 02:43

answered Dec 14 '10 at 20:14

olen_garn

892
7
16

Excellent! Exactly what I was looking for. – Gunnar Lium Dec 15 '10 at 08:43
To be precise, you have to return false on the overridden method. – Andrew Chen Aug 11 '15 at 18:58

score 20 · Answer 2 · answered May 03 '11 at 12:45

I had the same requirement and I just discovered that it will slide just one item per fling if I'll just return false.

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                       float velocityY) {        
    return false;
}

Someone Somewhere · Answer 3 · 2014-05-20T20:03:11.683

code example to answer the question:

public class SlowGallery extends Gallery
{


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

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

    public SlowGallery(Context context)
    {
        super(context);
    }


    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
    {

        //limit the max speed in either direction
        if (velocityX > 1200.0f)
        {
            velocityX = 1200.0f;
        }
        else if(velocityX < -1200.0f)
        {
            velocityX = -1200.0f;
        }

        return super.onFling(e1, e2, velocityX, velocityY);
    }

}

I think it should be: else if(velocityX < -1200.0f) – MataMix Jun 05 '12 at 14:46 — MataMix, Jun 05 '12 at 14:46

score 7 · Answer 4 · answered Mar 16 '11 at 22:34

7

I have a solution, which, although it does not guarantee at most one advance, is extremely simple (and likely does what you would do manually in code): simply decrease the x-velocity in the onFling parameter. That is, override the onFling to simply look like this:

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
    return super.onFling(e1, e2, velocityX / 4, velocityY);
}

Best,

Michael

answered Mar 16 '11 at 22:34

Michael F

333
3
7

This is a good one, you can reduce its speed with some animation :D like /2 , /3 – Sruit A.Suk Aug 08 '12 at 12:54

score 3 · Answer 5 · edited May 31 '12 at 14:35

Hi faced same problem , i solved issue using below logic .

1-> Create One class that class Should extends Gallery
2-> and Override onFling method .

see below code :

package com.sra;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Gallery;

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

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


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


    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                           float velocityY) {        
        return false;
    }

}

use this class in xml as a gallery :

<com.sra.GallView
                android:id="@+id/Gallery01"
                android:layout_width="fill_parent"
                android:layout_height="250dip" >
            </com.sra.GallView>

I used it. Its working. Now how can I make it endless gallery? I mean... first image after last image.... — Seshu Vinay, Jul 06 '12 at 04:44

score 0 · Answer 6 · answered Dec 14 '10 at 18:33

0

I could not find any way to limit scrolling, but I solved the issue implementing/adapting with some success this code: http://permalink.gmane.org/gmane.comp.handhelds.android.devel/101327

it implements a gallery with "fling"

answered Dec 14 '10 at 18:33

FrancescoR

535
1
4
12

How can I limit fling in Android gallery to just one item per fling?

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