Flutter報錯：flutter Your app isn't using AndroidX

運行flutter項目報錯：

Your app isn't using AndroidX.To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY.

安卓運行需要支持AndroidX，解決這個警告的辦法是在gradle.properties添加如下代碼即可：

android.enableJetifier=true
android.useAndroidX=true