Android webview加载https网页时http图片无法显示

今天碰到奇怪问题，我们加载网页从http改成https时，网页中的图片都无法加载。报错如下：


“Mixed Content: The page at ‘https://…’ was loaded over HTTPS,  
but requested an insecure image ‘http://image…..jpg‘.  
This content should also be served over HTTPS.”


原因：webview 从Lollipop(5.0)开始 webview默认不允许混合模式，https当中不能加载http资源，如果要加载，需单独设置开启。


解决方案： 

if (Build.VERSION.SDK_INT >= 21) {
               webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
 }