webView scroll滑动事件

public class ScrollWebView extends WebView{    private OnScrollChangedCallback mOnScrollChangedCallback;    public ScrollWebView(final Context context)    {        super(context);    }    public ScrollWebView(final Context context, final AttributeSet attrs)    {        super(context, attrs);    }    public ScrollWebView(final Context context, final AttributeSet attrs, final int defStyle)    {        super(context, attrs, defStyle);    }    @Override    protected void onScrollChanged(final int l, final int t, final int oldl, final int oldt)    {        super.onScrollChanged(l, t, oldl, oldt);        if(mOnScrollChangedCallback != null) mOnScrollChangedCallback.onScroll(l, t);    }    public OnScrollChangedCallback getOnScrollChangedCallback()    {        return mOnScrollChangedCallback;    }    public void setOnScrollChangedCallback(final OnScrollChangedCallback onScrollChangedCallback)    {        mOnScrollChangedCallback = onScrollChangedCallback;    }    /**     * Impliment in the activity/fragment/view that you want to listen to the webview     */    public static interface OnScrollChangedCallback    {        public void onScroll(int l, int t);    }}wv = (ScrollWebView) findViewById(R.id.scorllableWebview); wv.setOnScrollChangedCallback(new OnScrollChangedCallback(){    public void onScroll(int l, int t){      //Do stuff      Log.d(TAG,"We Scrolled etc...");    } });
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