解决Android WorkManager多通知覆盖问题：确保唯一通知ID

public final class NotificationHelper {
    private final String CHANNEL_ID = "reminder_channel_id";
    private final int NOTIFICATION_ID = 1; // 固定的通知ID
    // ...
    public void createNotification(@NotNull String title, @NotNull String message) {
        // ...
        NotificationManagerCompat.from(context).notify(NOTIFICATION_ID, notification); // 始终使用ID 1
    }
    // ...
}

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;

import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

import org.jetbrains.annotations.NotNull;

public final class NotificationHelper {
    private final String CHANNEL_ID = "reminder_channel_id";
    private final Context context;

    public NotificationHelper(@NotNull Context context) {
        this.context = context;
    }

    /**
     * 创建并显示一个通知。
     *
     * @param title 通知标题
     * @param message 通知内容
     * @param notificationId 唯一标识此通知的ID
     */
    public void createNotification(@NotNull String title, @NotNull String message, int notificationId) {
        createNotificationChannel();
        // 假设 AnimeActivity 是你的目标Activity，根据实际情况调整
        Intent intent = new Intent(context, AnimeActivity.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_IMMUTABLE);

        Notification notification = new NotificationCompat.Builder(context, CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_launcher_foreground) // 替换为你的应用图标
                .setContentTitle(title)
                .setContentText(message)
                .setContentIntent(pendingIntent)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                .setAutoCancel(true) // 用户点击后自动取消通知
                .build();

        NotificationManagerCompat.from(context).notify(notificationId, notification); // 使用传入的唯一ID
    }

    private final void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { // API 26 (Android O) 及以上需要通知渠道
            NotificationChannel channel = new NotificationChannel(this.CHANNEL_ID, "提醒通知", NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription("用于发送应用提醒的通知渠道");
            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            if (notificationManager != null) {
                notificationManager.createNotificationChannel(channel);
            }
        }
    }

    @NotNull
    public final Context getContext() {
        return this.context;
    }
}

import android.content.Context;

import androidx.annotation.NonNull;
import androidx.work.Worker;
import androidx.work.WorkerParameters;

import org.jetbrains.annotations.NotNull;

import java.util.UUID;

public final class ReminderWorker extends Worker {
    @NotNull
    private final Context context;
    @NotNull
    private final WorkerParameters params;

    public ReminderWorker(@NotNull Context context, @NotNull WorkerParameters params) {
        super(context, params);
        this.context = context;
        this.params = params;
    }

    @NotNull
    @Override
    public Result doWork() {
        // 生成一个唯一的通知ID。
        // 使用UUID的hashCode可以提供较高的唯一性，避免在极短时间内多次触发通知时的ID冲突。
        // 或者可以使用System.currentTimeMillis()，但需注意如果多个通知在同一毫秒内触发可能仍会冲突。
        int uniqueNotificationId = UUID.randomUUID().hashCode();
        if (uniqueNotificationId < 0) { // 确保ID为正数
            uniqueNotificationId = -uniqueNotificationId;
        }

        String title = this.getInputData().getString("title");
        String message = "这是一个提醒通知。"; // 根据实际需求设置通知内容

        new NotificationHelper(this.context).createNotification(title != null ? title : "未知提醒", message, uniqueNotificationId);
        return Result.success();
    }

    @NotNull
    public final Context getContext() {
        return this.context;
    }

    @NotNull
    public final WorkerParameters getParams() {
        return this.params;
    }
}