网页高度用 java 调用 js 获取 ，实际是用 js 代码进行获取。
view高度：

//网页高度用 java 调用 js 获取 ，实际是用 js 代码进行获取
        ViewTreeObserver viewTreeObserver  = webView.getViewTreeObserver();

        viewTreeObserver.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                int height = webView.getMeasuredHeight();
                if( height != 0 ){
                    Toast.makeText(context, "height:"+height,Toast.LENGTH_SHORT).show();
                    webView.getViewTreeObserver().removeOnPreDrawListener(this);
                    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,height);
                    webView.setLayoutParams(layoutParams);
                }
                return false;
            }
        });