Android Open Source - Billy Notifying Scroll View

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.vibin.billy;
/*  ww  w .j  av a  2s  . c o  m*/
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ScrollView;

import com.android.volley.toolbox.NetworkImageView;

/**
 * @author Cyril Mottier
 * A custom ScrollView which notifies when user scrolls.
 */
public class NotifyingScrollView extends ScrollView {

    private static final float DEFAULT_PARALLAX_FACTOR = 2.5F;
    NetworkImageView header;
    private OnScrollChangedListener mOnScrollChangedListener;

    public interface OnScrollChangedListener {
        void onScrollChanged(ScrollView who, int l, int t, int oldl, int oldt);
    }

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

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

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        header = (NetworkImageView) findViewById(R.id.image_header);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        float parallaxFactor = DEFAULT_PARALLAX_FACTOR;
        header.setTranslationY((float) t / parallaxFactor);
        if (mOnScrollChangedListener != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            mOnScrollChangedListener.onScrollChanged(this, l, t, oldl, oldt);
        }
    }

    public void setOnScrollChangedListener(OnScrollChangedListener listener) {
        mOnScrollChangedListener = listener;
    }

}

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