在Android Studio中指定发送通知的时间延迟

Question

我在Android Studio中设置了通知通道来发送通知。

到目前为止，我可以在点击按钮时发送通知。

但是，我想在发送通知时增加一个延迟。。例如在20秒之后发送通知。

我知道System.getTimeInMillis的AlarmManager中有一个函数与此相关，但不确定从这里开始该怎么办。

这是我的代码：

public class MyNotificationPublisher extends Application {
public static final String CHANNEL_1_ID = "channel1";
public static final String CHANNEL_2_ID = "channel2";
@Override
public void onCreate() {
super.onCreate();
createNotificationChannels();
}
private void createNotificationChannels() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel1 = new NotificationChannel(
CHANNEL_1_ID,
"Channel 1",
NotificationManager.IMPORTANCE_HIGH
);
channel1.setDescription("This is Channel 1");
NotificationChannel channel2 = new NotificationChannel(
CHANNEL_2_ID,
"Channel 2",
NotificationManager.IMPORTANCE_LOW
);
channel2.setDescription("This is Channel 2");
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel1);
manager.createNotificationChannel(channel2);
}
}
}

public class EmailActivity extends AppCompatActivity {
private Button btnSend;
private NotificationManagerCompat notificationManager;
private long tenSeconds = 10000L;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_email);
notificationManager = NotificationManagerCompat.from(this);
btnSend = findViewById(R.id.button_send);
}
public void sendOnChannel1(View v) {

Notification notification = new NotificationCompat.Builder(this, CHANNEL_1_ID)
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle("Hi")
.setContentText("Test")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.build();
notificationManager.notify(1, notification);
}
}

Answer 1

您只需安排要发送的通知：-

使用以下方法：

public void scheduleNotification(Context context, long delay, int notificationId)
{
//delay is after how much time(in millis) from current time you want to schedule the notification
NotificationCompat.Builder builder = new NotificationCompat.Builder(context) .setContentTitle(context.getString(R.string.title)) .setContentText(context.getString(R.string.content)) .setAutoCancel(true) .setSmallIcon(R.drawable.app_icon) .setLargeIcon(((BitmapDrawable) context.getResources().getDrawable(R.drawable.app_icon)).getBitmap()) .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)); 
Intent intent = new Intent(context, YourActivity.class);
PendingIntent activity = PendingIntent.getActivity(context, notificationId, intent, PendingIntent.FLAG_CANCEL_CURRENT);
builder.setContentIntent(activity); Notification notification = builder.build();
Intent notificationIntent = new Intent(context, MyNotificationPublisher.class);
notificationIntent.putExtra(MyNotificationPublisher.NOTIFICATION_ID, notificationId);
notificationIntent.putExtra(MyNotificationPublisher.NOTIFICATION, notification); 
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notificationId, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);
long futureInMillis = SystemClock.elapsedRealtime() + delay; 
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, futureInMillis, pendingIntent); 
} 

然后，接收器类别：

public class MyNotificationPublisher extends BroadcastReceiver {
public static String NOTIFICATION_ID = "notification_id"; 
public static String NOTIFICATION = "notification";
@Override 
public void onReceive(final Context context, Intent intent)
{
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = intent.getParcelableExtra(NOTIFICATION);
int notificationId = intent.getIntExtra(NOTIFICATION_ID, 0);
notificationManager.notify(notificationId, notification); 
}
} 

然后，使用适当的参数调用scheduleNotification。

Answer 2

使用处理程序延迟执行通知发送代码

像一样更新你的代码

public void sendOnChannel1(View v) {

Notification notification = new NotificationCompat.Builder(this, CHANNEL_1_ID)
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle("Hi")
.setContentText("Test")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.build();
new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
@Override
public void run() {
notificationManager.notify(1, notification);
}
}, 20000);
}