如何在Android中检测WebView的Scrollend?

问题描述

我的是我的本机应用程序，如果用户滚动到Webview的末尾，我想在其中显示/隐藏一个按钮.我在这里并获得了如何通过接口注册回调的完整思路.我的主要问题是我无法在onScrollChanged方法中获取我的计算结果.我已经尝试过将诸如getHeight()，getContentHeight()，top之类的东西组合在一起，但是似乎触发得太早了.我尝试了一个简单的页面，例如Google的页面，但内容相对较少，还有一个新闻页面.

Mine is a native app where I want to show/ hide a button if the user scrolls to the end of webview. I looked at an answer here and got the entire idea of how to register the callback via interface. My major issue is that I am not able to get my calculations right inside the onScrollChanged method. I have tried combination of things like getHeight(), getContentHeight(), top etc but it just seems to fire too early. I tried with a simple page like google's with comparatively lesser content as well as a news page.

对于正常的滚动视图，这些逻辑可以正常工作.由于网页内容很多，可能会使计算混乱.粘贴示例代码:不起作用.

These logics work fine for a normal scroll view. Since the webpage has a lot of content, it could be messing up the calculations. Pasting a sample code: does not work.

@Override
protected void onScrollChanged(int left, int top, int oldLeft, int oldTop) {
    if ( mOnWebViewBottomReachedListener != null ) {
        //if ( (getContentHeight() - (top + getHeight())) <= mMinDistance )
        int diff = (getBottom() - (getHeight() + getScrollY()));
        Log.e("values ", diff+" o");
        if ((int) Math.floor(getContentHeight() * getScaleY()) == top)
            mOnWebViewBottomReachedListener.onBottomReached(this);
    }
    super.onScrollChanged(left, top, oldLeft, oldTop);
}

需要帮助.谢谢.

推荐答案

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    int height = (int) Math.floor(this.getContentHeight() * this.getScale());
    int webViewHeight = this.getMeasuredHeight();
    if(this.getScrollY() + webViewHeight >= height){
       Log.i("THE END", "reached");
    }
    super.onScrollChanged(l, t, oldl, oldt);
}

此逻辑适用于Web视图.

This logic works fine for a webview.

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