插件类继承 ActivityAware，重写onAttachedToActivity、onDetachedFromActivityForConfigChanges、onReattachedToActivityForConfigChanges、onDetachedFromActivity四个方法，其中在onAttachedToActivity、onReattachedToActivityForConfigChanges可以获取到getActivity
public class MyFfPlugin implements FlutterPlugin, MethodCallHandler, ActivityAware {}
@Override
public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {
activity = binding.getActivity();
}
那么如何获取FragmentActivity呢？现在很多插件库都是需要用到FragmentActivity，如果传入activity 是不行的
答案：找到 MainActivity
image.png
public class MainActivity extends FlutterActivity {
}
这里的FlutterActivity 显然是继承了Activity，所以你在插件onAttachedToActivity中拿到的就是Activity
image.png
如果你想拿到FragmentActivity，MainActivity就不能继承FlutterActivity ，而是继承FlutterFragmentActivity
修改后
import io.flutter.embedding.android.FlutterFragmentActivity;
public class MainActivity extends FlutterFragmentActivity {
}
然后回到插件类中,把fragmentActivity 保存到顶部，方便其他方法使用
@Override
public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {
if (binding.getActivity() instanceof FragmentActivity) {
fragmentActivity = (FragmentActivity) binding.getActivity();
}
}
