我正在尝试使用Flutter android_alarm_manager创建一些后台任务，但如果没有firebase身份验证，似乎无法使其正常工作。我遵循了readme on the plugin，但是仅在import numpy as np
from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
import matplotlib.pyplot as plt
def main():
# plotting parameters
num_polartheta = 12
num_p = 6
num_polarphi = 6 * num_polartheta - 5
# range of hydrostatic stress (p) to plot p = (x + y + z)/3
pmin = 0
pmax = 100
p = np.linspace(pmin, pmax, num=num_p)
# 360 degrees in the shperical phi
polar_phi = np.linspace(0, 2 * np.pi, num_polarphi)
# along theta angle
th1 = np.linspace(-np.pi / 6, np.pi / 6, num=num_polartheta)
th2 = np.linspace(np.pi / 6, -np.pi / 6, num=num_polartheta)
polar_theta = np.r_[th1, th2[1:], th1[1:], th2[1:], th1[1:], th2[1:]]
# create grid
grd_phi = np.tile(polar_phi, (num_p, 1))
grd_th = np.tile(polar_theta, (num_p, 1))
grd_p = np.tile(p.reshape(num_p, 1), (1, num_polarphi))
# Material parameter
# effective friction angle,
mat_phi = 30
mat_phi = np.radians(mat_phi)
# Matsuoka-Nakai yield surface
kmn = (9 - np.sin(mat_phi) ** 2) / (1 - np.sin(mat_phi) ** 2)
A1 = (kmn - 3) / (kmn - 9)
A2 = kmn / (kmn - 9)
sqrtJ2 = grd_p / (
2
/ np.sqrt(3)
* np.sqrt(A1)
* np.cos(1 / 3 * np.arccos(A2 / A1 ** (3 / 2) * np.sin(3 * grd_th)))
)
X = grd_p + np.sqrt(2 / 3) * sqrtJ2 * np.cos(grd_phi + 2 * np.pi / 3)
Y = grd_p + np.sqrt(2 / 3) * sqrtJ2 * np.cos(grd_phi)
Z = grd_p + np.sqrt(2 / 3) * sqrtJ2 * np.cos(grd_phi - 2 * np.pi / 3)
fig = plt.figure()
ax = fig.add_subplot(111, projection="3d")
surf = ax.plot_surface(X, Y, Z, cmap=cm.coolwarm)
ax.view_init(elev=40, azim=45)
ax.set_xlabel(r"$\sigma_1$")
ax.set_ylabel(r"$\sigma_2$")
ax.set_zlabel(r"$\sigma_3$")
plt.show()
if __name__ == "__main__":
main()
中添加android_alarm_manager插件会导致应用在启动时立即崩溃（模拟器和真实设备）。如何避免Firebase集成并仍然使用警报管理器插件？
答案 0 :(得分：1)
回复： but can't seem to get it working without the firebase auth
也许在您尝试回到2018年时，您的应用程序中出现了一些意外纠缠或其他问题，但是到目前为止，https://pub.dev/packages/android_alarm_manager不需要任何Firebase。
只需在清单中设置一些权限，服务和接收者，然后此示例即可运行：
import 'package:android_alarm_manager/android_alarm_manager.dart';
void printHello() {
final DateTime now = DateTime.now();
final int isolateId = Isolate.current.hashCode;
print("[$now] Hello, world! isolate=${isolateId} function='$printHello'");
}
main() async {
final int helloAlarmID = 0;
await AndroidAlarmManager.initialize();
runApp(...);
await AndroidAlarmManager.periodic(const Duration(minutes: 1), helloAlarmID, printHello);
}