崩溃的应用程序是一个遗留的应用程序，仍然使用GCM进行通知，没有任何支持，但当我将应用程序升级到Target sdk API 33时，它开始在Android API 31或更高版本的手机中崩溃，并开始引发以下异常：

java.lang.IllegalArgumentException: 
Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
 
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depenat android.app.PendingIntent.checkPendingIntent(PendingIntent.java:428)

at android.app.PendingIntent.checkPendingIntent(PendingIntent.java:428)
at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:731)
at android.app.PendingIntent.getBroadcast(PendingIntent.java:718)
at com.google.android.gms.iid.zzl.zzi(Unknown Source:18)
at com.google.android.gms.iid.zzl.zzb(Unknown Source:224)
at com.google.android.gms.iid.zzl.zza(Unknown Source:0)
at com.google.android.gms.iid.InstanceID.zzb(Unknown Source:60)
at com.google.android.gms.iid.InstanceID.getToken(Unknown Source:120)

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当我调试时，我发现应用程序在以下行崩溃：

regid = instanceID.getToken(SENDER_ID, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);

型
没有将GCM更新到Firebase的选项，因为这需要大量的工作和资源。