MAUI Blazor Android 输入框软键盘遮挡问题

前言

最近才发现MAUI Blazor Android存在输入框软键盘遮挡这个问题，搜索了一番，原来这是安卓webview一个由来已久的问题，还好有大佬提出了解决方案 AndroidBug5497Workaround，但是这是Java代码，MAUI中需要做一些小的修改，修改一些方法名还有类的明确引用。废话不多说，直接上代码。

解决方案

第一步

将下面的代码添加到Platforms/Android文件夹中，注意using ，一个也不能少，我最开始就是因为缺少using Rect = Android.Graphics.Rect;没有成功。命名空间也别忘了更改。

using Android.App; using Android.Widget; using static Android.Resource; using Rect = Android.Graphics.Rect; using View = Android.Views.View;  namespace MauiApp3.Platforms.Android {     public class AndroidBug5497Workaround     {          // For more information, see https://code.google.com/p/android/issues/detail?id=5497         // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.          public static void AssistActivity(Activity activity)         {             new AndroidBug5497Workaround(activity);         }          private View mChildOfContent;         private int usableHeightPrevious;         private FrameLayout.LayoutParams frameLayoutParams;          private AndroidBug5497Workaround(Activity activity)         {             FrameLayout content = (FrameLayout)activity.FindViewById(Id.Content);             mChildOfContent = content.GetChildAt(0);             mChildOfContent.ViewTreeObserver.GlobalLayout += (s, o) => PossiblyResizeChildOfContent();             frameLayoutParams = (FrameLayout.LayoutParams)mChildOfContent.LayoutParameters;         }          private void PossiblyResizeChildOfContent()         {             int usableHeightNow = ComputeUsableHeight();             if (usableHeightNow != usableHeightPrevious)             {                 int usableHeightSansKeyboard = mChildOfContent.RootView.Height;                 int heightDifference = usableHeightSansKeyboard - usableHeightNow;                 if (heightDifference > (usableHeightSansKeyboard / 4))                 {                     // keyboard probably just became visible                     frameLayoutParams.Height = usableHeightSansKeyboard - heightDifference;                 }                 else                 {                     // keyboard probably just became hidden                     frameLayoutParams.Height = usableHeightSansKeyboard;                 }                 mChildOfContent.RequestLayout();                 usableHeightPrevious = usableHeightNow;             }         }          private int ComputeUsableHeight()         {             Rect r = new Rect();             mChildOfContent.GetWindowVisibleDisplayFrame(r);             return (int)(r.Bottom - r.Top);// 全屏模式下： return r.bottom         }      } }  

第二步

Platforms/Android/MainActivity.cs中添加以下代码

protected override void OnCreate(Bundle savedInstanceState)     {         base.OnCreate(savedInstanceState);         AndroidBug5497Workaround.AssistActivity(this);     } 

后记

网上还有一些其他人针对底部导航栏和华为的修复，貌似加的也不多，参考着改改就能用了