android studio 艾宾浩斯曲线算法使用

艾宾浩斯曲线算法（Ebbinghaus Forgetting Curve）可以用来帮助我们更好的记忆知识点，Android Studio 上的实现方式可以通过使用定时器（Timer）和通知栏（Notification）来实现。

首先，定义一个数组来存储需要记忆的知识点，以及相应的记忆时间间隔。例如：

String[] knowledgePoints = {
    "Android四大组件", "1小时",
    "Android生命周期", "30分钟",
    "Android布局", "2小时",
    "Android网络编程", "4小时",
    "Android数据存储", "3小时"
};

接下来，在 Activity 中创建一个定时器，并设置定时器任务来发送通知。在定时器任务中，遍历知识点数组，如果当前时间已经超过了下一次复习的时间，那么就发送一条通知提醒用户复习对应的知识点。

Timer timer = new Timer();
timer.schedule(new TimerTask() {
    @Override
    public void run() {
        for (int i = 0; i < knowledgePoints.length; i += 2) {
            String knowledgePoint = knowledgePoints[i];
            long timeInterval = getTimeInterval(knowledgePoints[i + 1]);
            long nextReviewTime = getNextReviewTime(knowledgePoint, timeInterval);
            if (System.currentTimeMillis() >= nextReviewTime) {
                sendNotification(knowledgePoint);
                updateNextReviewTime(knowledgePoint, nextReviewTime);
            }
        }
    }
}, 0, 60 * 1000); // 每分钟检查一次

其中，`getTimeInterval()` 方法用于将时间间隔字符串转换为毫秒数，`getNextReviewTime()` 方法用于计算下一次复习的时间，`sendNotification()` 方法用于发送通知，`updateNextReviewTime()` 方法用于更新下一次复习的时间。

private long getTimeInterval(String timeIntervalStr) {
    long hour = 60 * 60 * 1000;
    long minute = 60 * 1000;
    if (timeIntervalStr.endsWith("小时")) {
        return Long.parseLong(timeIntervalStr.replace("小时", "")) * hour;
    } else if (timeIntervalStr.endsWith("分钟")) {
        return Long.parseLong(timeIntervalStr.replace("分钟", "")) * minute;
    } else {
        return 0;
    }
}

private long getNextReviewTime(String knowledgePoint, long timeInterval) {
    SharedPreferences sp = getSharedPreferences("review", MODE_PRIVATE);
    long lastReviewTime = sp.getLong(knowledgePoint, 0);
    if (lastReviewTime == 0) {
        return System.currentTimeMillis() + timeInterval;
    } else {
        return lastReviewTime + (long) (timeInterval * 1.5);
    }
}

private void sendNotification(String knowledgePoint) {
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "review")
            .setSmallIcon(R.drawable.ic_notification)
            .setContentTitle("复习 " + knowledgePoint)
            .setContentText("点击查看详情")
            .setAutoCancel(true);
    Intent intent = new Intent(this, ReviewActivity.class);
    intent.putExtra("knowledgePoint", knowledgePoint);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(pendingIntent);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel("review", "复习提醒", NotificationManager.IMPORTANCE_HIGH);
        manager.createNotificationChannel(channel);
    }
    manager.notify(knowledgePoint.hashCode(), builder.build());
}

private void updateNextReviewTime(String knowledgePoint, long nextReviewTime) {
    SharedPreferences sp = getSharedPreferences("review", MODE_PRIVATE);
    sp.edit().putLong(knowledgePoint, nextReviewTime).apply();
}

最后，在通知点击后进入 ReviewActivity 中，展示对应知识点的详细内容。

String knowledgePoint = getIntent().getStringExtra("knowledgePoint");
// 根据知识点展示详细内容