一:判断WebView内容高度与WebView高度

mWebViewList.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                // TODO Auto-generated method stub
                super.onPageFinished(view, url);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        int contentHeight = mWebViewList.getContentHeight();
                        int viewHeight = mWebViewList.getHeight();
                        if (contentHeight > viewHeight) {//内容高度>View高度
                            imgPullDown.setVisibility(View.VISIBLE);
                        } else {//内容高度<View高度
                            imgPullDown.setVisibility(View.GONE);
                        }
                    }
                }, 500);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                // TODO Auto-generated method stub
                view.loadUrl(url);
                return true;
            }

            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                // TODO Auto-generated method stub
                super.onReceivedError(view, errorCode, description, failingUrl);
            }

        });

二:处理WebView滑动事件判断是否滑动到底部

• 自定义WebView重写onScrollChanged方法

public class ObservableWebView extends WebView {

    private OnScrolldListener mOnScrolldListener;

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

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

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

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        // TODO Auto-generated method stub

        super.onScrollChanged(l, t, oldl, oldt);

        mOnScrolldListener.Scroll(l, t, oldl, oldt);
    }

    public OnScrolldListener getOnScrolldListener() {
        return mOnScrolldListener;
    }

    public void setOnScrolldListener(OnScrolldListener mOnScrolldListener) {
        this.mOnScrolldListener = mOnScrolldListener;
    }

    /**
     * Event listener.
     */
    public interface OnScrolldListener {

        void Scroll(int l, int t, int oldl, int oldt);
    }

}

• 判断是否滑动到底部

mWebViewList.setOnScrolldListener(new OnScrolldListener() {

            @Override
            public void Scroll(int l, int t, int oldl, int oldt) {
                // TODO Auto-generated method stub
                // WebView的总高度
                int webViewContentHeight = (int) (mWebViewList.getContentHeight() * mWebViewList.getScale());
                // WebView的现高度
                int webViewCurrentHeight = (mWebViewList.getHeight() + mWebViewList.getScrollY());
                Log.i(TAG, "webViewContentHeight=" + webViewContentHeight);
                Log.i(TAG, "webViewCurrentHeight=" + webViewCurrentHeight);
                if ((webViewContentHeight - webViewCurrentHeight) == 0) {
                    System.out.println("WebView滑动到了底端");
                    if (imgPullDown.getVisibility() == View.VISIBLE)
                        imgPullDown.setVisibility(View.GONE);
                } else {
                    if (imgPullDown.getVisibility() == View.GONE) {
                        imgPullDown.setVisibility(View.VISIBLE);
                    }
                }
            }
        });