AndroidX

[!] 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.

在 gradle.properties 中添加如下代码即可

android.enableJetifier=true
android.useAndroidX=true

flutter 超出容器

只需要在外面包裹一层

SingleChildScrollView(
    child:xxx
)

flutter 应用前后台

@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  switch (state) {
    case AppLifecycleState.inactive: // 处于这种状态的应用程序应该假设它们可能在任何时候暂停。
      break;
    case AppLifecycleState.resumed:  // 应用程序可见，前台
      break;
    case AppLifecycleState.paused:   // 应用程序不可见，后台
      break;
    case AppLifecycleState.detached: // 申请将暂时暂停
      break;
  }
}