崩溃！

自建异常捕获信息如下
Caused by: com.XXX.flutter.crash.FlutterException: PlatformException(error, Attempt to invoke virtual method 'android.view.Window android.app.Activity.getWindow()' on a null object reference, null)
2at @. (:149)
3at @. MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:156)
4at @. HapticFeedback.mediumImpact (package:flutter/src/services/haptic_feedback.dart:52)

代码位置如下：
private void playSystemSound(SoundType soundType) {
if (soundType == SoundType.CLICK) {
View view = this.activity.getWindow().getDecorView();
view.playSoundEffect(0);
}
}

this.activity.getWindow().getDecorView();
activity 为空导致大量崩溃。

Start at the playSystemSound method shown in the issue and trace how this.activity is initialized and used during Flutter haptic or system-sound calls. Confirm the lifecycle path that leaves the activity null and define done as preventing the reported null dereference without breaking sound feedback; the payload names no file or regression test.

Written by the indexing model from the issue text.