如何在特定时间在android上发出通知？

我想在特定时间通知我的应用程序。比如说，即使应用程序关闭，我每天都必须在早上7点发出通知

我该怎么做？有教程吗？

---

请提及该链接。

您可以使用

AlarmManager

在指定时间设置报警

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
if (!prefs.getBoolean("firstTime", false)) {

    Intent alarmIntent = new Intent(this, AlarmReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);

    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 7);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 1);

    manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
            AlarmManager.INTERVAL_DAY, pendingIntent);

    SharedPreferences.Editor editor = prefs.edit();
    editor.putBoolean("firstTime", true);
    editor.apply();
}

我使用

SharedReferences

检查这不是第一次运行应用程序，如果是，则设置该警报，否则不执行任何操作，而不是在每次启动应用程序时重置警报。
使用

广播接收器

在警报发生时收听

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // show toast
        Toast.makeText(context, "Alarm running", Toast.LENGTH_SHORT).show();
    }
}

使用另一个接收器收听设备启动，以便重置警报

public class DeviceBootReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            // on device boot compelete, reset the alarm
            Intent alarmIntent = new Intent(context, AlarmReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);

            AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 7);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 1);

            manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                    AlarmManager.INTERVAL_DAY, pendingIntent);
        }
    }
}

将权限添加到清单中

<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

然后注册你的接收者

<receiver android:name=".DeviceBootReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>
<receiver android:name=".AlarmReceiver" />

---

首先，您需要使用广播接收器。因为一个广播接收器只启动了很短的时间

在处理广播时，应用程序会得到一组固定的时间（目前为10秒）来完成它的工作。如果没有在这段时间内完成，应用程序将被视为行为异常，其进程将立即进入后台状态，以便在需要时为内存而终止

使用意图服务是一种更好的做法。这里有一个示例，说明如何使用意图服务

这是广播接收器类

public class MyReceiver extends BroadcastReceiver {
    public MyReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        Intent intent1 = new Intent(context, MyNewIntentService.class);
        context.startService(intent1);
    }
}

并在舱单上登记

<receiver
    android:name=".MyReceiver"
    android:enabled="true"
    android:exported="false" >
</receiver>

<service
    android:name=".MyNewIntentService"
    android:exported="false" >
</service>

并在舱单上登记

<receiver
    android:name=".MyReceiver"
    android:enabled="true"
    android:exported="false" >
</receiver>

<service
    android:name=".MyNewIntentService"
    android:exported="false" >
</service>

---

我希望这将对您有所帮助。

由于后台服务限制（），来自公认答案的解决方案将无法在Android 8 Oreo（api级别26）及更高版本上正常工作，并且在应用程序处于后台时将导致类似的异常：

java.lang.IllegalStateException: Not allowed to start service Intent xxx: app is in background

可能的解决方法之一是使用：

从

JobIntentService

而不是

IntentService

扩展您的

Service

，并使用

onHandleWork

方法而不是

onhandlecontent

将

android:permission=“android.permission.BIND_JOB_SERVICE”

添加到

AndroidManifest.xml

中的

服务中

• 从系统获取报警服务
• 创建挂起的意图，传入广播接收器类的名称
• 制作日历对象并将其时间设置为上午8点
• 检查当前时间是否超过8。如果是，则再增加一天
• 调用AlarmManager类的set repeating方法

相同的示例代码：

alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);   
alarmIntent = new Intent(context of current file, AlarmReceiver1.class); 
AlarmReceiver1 = broadcast receiver

    pendingIntent = PendingIntent.getBroadcast(  Menu.this, 0, alarmIntent, 
PendingIntent.FLAG_UPDATE_CURRENT);
    alarmIntent.setData((Uri.parse("custom://"+System.currentTimeMillis())));
    alarmManager.cancel(pendingIntent);

    Calendar alarmStartTime = Calendar.getInstance();
    Calendar now = Calendar.getInstance();
    alarmStartTime.set(Calendar.HOUR_OF_DAY, 8);
    alarmStartTime.set(Calendar.MINUTE, 00);
    alarmStartTime.set(Calendar.SECOND, 0);
    if (now.after(alarmStartTime)) {
        Log.d("Hey","Added a day");
        alarmStartTime.add(Calendar.DATE, 1);
    }

     alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
alarmStartTime.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
     Log.d("Alarm","Alarms set for everyday 8 am.");

来上广播接收机课。您需要在清单中注册广播接收器。这将导致您接收时钟事件。 覆盖此广播接收器的onReceive方法，并在其中自行发出通知，或创建单独的通知生成服务，并在其中生成和显示通知

清单代码段：

public class AlarmReceiver1 extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
  Intent service1 = new Intent(context, NotificationService1.class);
service1.setData((Uri.parse("custom://"+System.currentTimeMillis())));
          context.startService(service1);
}

public class NotificationService1 extends IntentService{

private NotificationManager notificationManager;
private PendingIntent pendingIntent;
private static int NOTIFICATION_ID = 1;
Notification notification;
@Override
protected void onHandleIntent(Intent intent) {
Context context = this.getApplicationContext();
       notificationManager = 
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent mIntent = new Intent(this, Activity to be opened after clicking on the 
notif);
        Bundle bundle = new Bundle(); 
        bundle.putString("test", "test");
        mIntent.putExtras(bundle);
        pendingIntent = PendingIntent.getActivity(context, 0, mIntent, 
PendingIntent.FLAG_UPDATE_CURRENT);     

        Resources res = this.getResources();
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        notification = new NotificationCompat.Builder(this)
                    .setContentIntent(pendingIntent)
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
                    .setTicker("ticker value")
                    .setAutoCancel(true)
                    .setPriority(8)
                    .setSound(soundUri)
                    .setContentTitle("Notif title")
                    .setContentText("Text").build();
        notification.flags |= Notification.FLAG_AUTO_CANCEL | Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE;
        notification.ledARGB = 0xFFFFA500;
        notification.ledOnMS = 800;
        notification.ledOffMS = 1000;
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(NOTIFICATION_ID, notification);
        Log.i("notif","Notifications sent.");

}

}

广播接收器代码段：

public class AlarmReceiver1 extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
  Intent service1 = new Intent(context, NotificationService1.class);
service1.setData((Uri.parse("custom://"+System.currentTimeMillis())));
          context.startService(service1);
}

public class NotificationService1 extends IntentService{

private NotificationManager notificationManager;
private PendingIntent pendingIntent;
private static int NOTIFICATION_ID = 1;
Notification notification;
@Override
protected void onHandleIntent(Intent intent) {
Context context = this.getApplicationContext();
       notificationManager = 
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent mIntent = new Intent(this, Activity to be opened after clicking on the 
notif);
        Bundle bundle = new Bundle(); 
        bundle.putString("test", "test");
        mIntent.putExtras(bundle);
        pendingIntent = PendingIntent.getActivity(context, 0, mIntent, 
PendingIntent.FLAG_UPDATE_CURRENT);     

        Resources res = this.getResources();
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        notification = new NotificationCompat.Builder(this)
                    .setContentIntent(pendingIntent)
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
                    .setTicker("ticker value")
                    .setAutoCancel(true)
                    .setPriority(8)
                    .setSound(soundUri)
                    .setContentTitle("Notif title")
                    .setContentText("Text").build();
        notification.flags |= Notification.FLAG_AUTO_CANCEL | Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE;
        notification.ledARGB = 0xFFFFA500;
        notification.ledOnMS = 800;
        notification.ledOffMS = 1000;
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(NOTIFICATION_ID, notification);
        Log.i("notif","Notifications sent.");

}

}

通知建筑服务代码段：

public class AlarmReceiver1 extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
  Intent service1 = new Intent(context, NotificationService1.class);
service1.setData((Uri.parse("custom://"+System.currentTimeMillis())));
          context.startService(service1);
}

public class NotificationService1 extends IntentService{

private NotificationManager notificationManager;
private PendingIntent pendingIntent;
private static int NOTIFICATION_ID = 1;
Notification notification;
@Override
protected void onHandleIntent(Intent intent) {
Context context = this.getApplicationContext();
       notificationManager = 
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent mIntent = new Intent(this, Activity to be opened after clicking on the 
notif);
        Bundle bundle = new Bundle(); 
        bundle.putString("test", "test");
        mIntent.putExtras(bundle);
        pendingIntent = PendingIntent.getActivity(context, 0, mIntent, 
PendingIntent.FLAG_UPDATE_CURRENT);     

        Resources res = this.getResources();
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
        notification = new NotificationCompat.Builder(this)
                    .setContentIntent(pendingIntent)
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
                    .setTicker("ticker value")
                    .setAutoCancel(true)
                    .setPriority(8)
                    .setSound(soundUri)
                    .setContentTitle("Notif title")
                    .setContentText("Text").build();
        notification.flags |= Notification.FLAG_AUTO_CANCEL | Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE;
        notification.ledARGB = 0xFFFFA500;
        notification.ledOnMS = 800;
        notification.ledOffMS = 1000;
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(NOTIFICATION_ID, notification);
        Log.i("notif","Notifications sent.");

}

}

---

使用NotifyMe Android库进行简单通知。当您希望弹出通知时，可以非常轻松地设置延迟或时间。通知将通过系统重新启动弹出

使用Jitpack.io下载库 将此添加到应用程序的build.gradle文件中

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

将其添加到项目的build.gradle中的依赖项中

dependencies {
        implementation 'com.github.jakebonk:NotifyMe:1.0.1'
}

范例 创建NotifyMe生成器对象

NotifyMe.Builder notifyMe = new NotifyMe.Builder(getApplicationContext());

然后设置所需的字段

notifyMe.title(String title);
notifyMe.content(String content);
notifyMe.color(Int red,Int green,Int blue,Int alpha);//Color of notification header
notifyMe.led_color(Int red,Int green,Int blue,Int alpha);//Color of LED when 
notification pops up
notifyMe.time(Calendar time);//The time to popup notification
notifyMe.delay(Int delay);//Delay in ms
notifyMe.large_icon(Int resource);//Icon resource by ID
notifyMe.rrule("FREQ=MINUTELY;INTERVAL=5;COUNT=2")//RRULE for frequency of 
//notification
notifyMe.addAction(Intent intent,String text); //The action will call the intent when 
//pressed

设置完所有需要的字段后，只需调用build（）

---

这是我的解决方案，在安卓10上测试。还与所有以前版本的android兼容

MainActivity.class

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    ....
    reminderNotification();

}

public void reminderNotification()
{
    NotificationUtils _notificationUtils = new NotificationUtils(this);
    long _currentTime = System.currentTimeMillis();
    long tenSeconds = 1000 * 10;
    long _triggerReminder = _currentTime + tenSeconds; //triggers a reminder after 10 seconds.
    _notificationUtils.setReminder(_triggerReminder);
}

public class NotificationUtils extends ContextWrapper
{

    private NotificationManager _notificationManager;
    private Context _context;

    public NotificationUtils(Context base)
    {
        super(base);
        _context = base;
        createChannel();
    }

    public NotificationCompat.Builder setNotification(String title, String body)
    {
        return new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.noti_icon)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);
    }

    private void createChannel()
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, TIMELINE_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            getManager().createNotificationChannel(channel);
        }
    }

    public NotificationManager getManager()
    {
        if(_notificationManager == null)
        {
            _notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }

        return _notificationManager;
    }

    public void setReminder(long timeInMillis)
    {
        Intent _intent = new Intent(_context, ReminderBroadcast.class);
        PendingIntent _pendingIntent = PendingIntent.getBroadcast(_context, 0, _intent, 0);

        AlarmManager _alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        _alarmManager.set(AlarmManager.RTC_WAKEUP, timeInMillis, _pendingIntent);
    }

}

public class ReminderBroadcast extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        NotificationUtils _notificationUtils = new NotificationUtils(context);
        NotificationCompat.Builder _builder = _notificationUtils.setNotification("Testing", "Testing notification system");
        _notificationUtils.getManager().notify(101, _builder.build());
    }
}

NotificationUtils.class

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    ....
    reminderNotification();

}

public void reminderNotification()
{
    NotificationUtils _notificationUtils = new NotificationUtils(this);
    long _currentTime = System.currentTimeMillis();
    long tenSeconds = 1000 * 10;
    long _triggerReminder = _currentTime + tenSeconds; //triggers a reminder after 10 seconds.
    _notificationUtils.setReminder(_triggerReminder);
}

public class NotificationUtils extends ContextWrapper
{

    private NotificationManager _notificationManager;
    private Context _context;

    public NotificationUtils(Context base)
    {
        super(base);
        _context = base;
        createChannel();
    }

    public NotificationCompat.Builder setNotification(String title, String body)
    {
        return new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.noti_icon)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);
    }

    private void createChannel()
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, TIMELINE_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            getManager().createNotificationChannel(channel);
        }
    }

    public NotificationManager getManager()
    {
        if(_notificationManager == null)
        {
            _notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }

        return _notificationManager;
    }

    public void setReminder(long timeInMillis)
    {
        Intent _intent = new Intent(_context, ReminderBroadcast.class);
        PendingIntent _pendingIntent = PendingIntent.getBroadcast(_context, 0, _intent, 0);

        AlarmManager _alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        _alarmManager.set(AlarmManager.RTC_WAKEUP, timeInMillis, _pendingIntent);
    }

}

public class ReminderBroadcast extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        NotificationUtils _notificationUtils = new NotificationUtils(context);
        NotificationCompat.Builder _builder = _notificationUtils.setNotification("Testing", "Testing notification system");
        _notificationUtils.getManager().notify(101, _builder.build());
    }
}

提醒广播类

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    ....
    reminderNotification();

}

public void reminderNotification()
{
    NotificationUtils _notificationUtils = new NotificationUtils(this);
    long _currentTime = System.currentTimeMillis();
    long tenSeconds = 1000 * 10;
    long _triggerReminder = _currentTime + tenSeconds; //triggers a reminder after 10 seconds.
    _notificationUtils.setReminder(_triggerReminder);
}

public class NotificationUtils extends ContextWrapper
{

    private NotificationManager _notificationManager;
    private Context _context;

    public NotificationUtils(Context base)
    {
        super(base);
        _context = base;
        createChannel();
    }

    public NotificationCompat.Builder setNotification(String title, String body)
    {
        return new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.noti_icon)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);
    }

    private void createChannel()
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, TIMELINE_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            getManager().createNotificationChannel(channel);
        }
    }

    public NotificationManager getManager()
    {
        if(_notificationManager == null)
        {
            _notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }

        return _notificationManager;
    }

    public void setReminder(long timeInMillis)
    {
        Intent _intent = new Intent(_context, ReminderBroadcast.class);
        PendingIntent _pendingIntent = PendingIntent.getBroadcast(_context, 0, _intent, 0);

        AlarmManager _alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        _alarmManager.set(AlarmManager.RTC_WAKEUP, timeInMillis, _pendingIntent);
    }

}

public class ReminderBroadcast extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        NotificationUtils _notificationUtils = new NotificationUtils(context);
        NotificationCompat.Builder _builder = _notificationUtils.setNotification("Testing", "Testing notification system");
        _notificationUtils.getManager().notify(101, _builder.build());
    }
}

AndroidManifest.xml

<application>
    ...
    <receiver android:name=".custom.ReminderBroadcast"/>
</application>

...

注意：

CHANNEL\u ID

和

TIMELINE\u CHANNEL\u NAME

已在另一个类上创建

比如说,

CHANNEL\u ID=“通知频道”

TIMELINE\u CHANNEL\u NAME=“TIMELINE notification”

---

如果对我的代码和bug有任何误解，请随时发表评论。我会尽快回复。

对我不起作用，尝试手动设置时间，但仍然无效。使用广播的原因是什么？不认为这是必要的/有用的。你可以直接用一个挂起的帐篷与你的意向服务对话。它在Pie版本中有效吗？似乎没有这样做：（@NarendraSingh，这是因为您需要android O及更高版本的通知通道。查看是否在打开应用程序时也发送通知？您可以在

onCreate（）中添加通知代码）

启动程序活动的方法。感谢您的回复。

SharedReference

第二天将如何工作？因为布尔值将为False。欢迎使用。

SharedReference

在应用程序首次启动时仅工作一次以设置警报，然后将布尔值设置为true，即应用程序在或者，为了避免反复重置警报。如果您的意图神奇地消失，您可能需要放置一个标志：。此外，如果您的

可序列化的
对象未包装在
包中，则它们可能会变为空值。
：。当使用接受答案中给出的代码并根据您的说明修改它时，此方法不起作用。这不是调用ing
BroadCastReceiver
。我该如何解决这个问题？如果没有看到您的代码，很难说。如果您的接收器有问题，它发生在启动服务之前，我的意思是，无论您使用我的建议还是从接受方的答案。您是否已在清单中注册了接收器？为什么不一起删除服务？Settin通知应该足够快，以便在广播接收器中完成。