如何更新Android前台服务的通知文本？

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public class NotificationService extends Service {
    private static final int ONGOING_NOTIFICATION = 1;
    private Notification notification;
    @Override
    public void onCreate() {
        super.onCreate();
        this.notification = new Notification(R.drawable.statusbar, getText(R.string.app_name), System.currentTimeMillis());
        Intent notificationIntent = new Intent(this, AbList.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
        this.notification.setLatestEventInfo(this, getText(R.string.app_name), "Update This Text", pendingIntent);
        startForeground(ONGOING_NOTIFICATION, this.notification);
    }

    // Start Notification Service
    Intent serviceIntent = new Intent(this, NotificationService.class);
    startService(serviceIntent);

private static final int NOTIF_ID=1;
@Override
public void onCreate(){
        this.startForeground();
private void startForeground(){
        startForeground(NOTIF_ID,getMyActivityNotification(""));
private Notification getMyActivityNotification(String text){
        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){
        ((NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(
        NotificationChannel("timer_notification","Timer Notification",NotificationManager.IMPORTANCE_HIGH))
        // The PendingIntent to launch our activity if the user selects
        // this notification
        PendingIntent contentIntent=PendingIntent.getActivity(this,
        0,new Intent(this,MyActivity.class),0);
        return new NotificationCompat.Builder(this,"my_channel_01")
        .setContentTitle("some title")
        .setContentText(text)
        .setOnlyAlertOnce(true) // so when data is updated don't make sound and alert in android 8.0+
        .setOngoing(true)
        .setSmallIcon(R.drawable.ic_launcher_b3)
        .setContentIntent(contentIntent)
        .build();
 * This is the method that can be called to update the Notification
private void updateNotification(){
        String text="Some text that will update the notification";
        Notification notification=getMyActivityNotification(text);
        NotificationManager mNotificationManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(NOTIF_ID,notification);
}

private void notify(@NonNull String action) {
    boolean isForegroundNotificationVisible = false;
    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    StatusBarNotification[] notifications = notificationManager.getActiveNotifications();
    for (StatusBarNotification notification : notifications) {
        if (notification.getId() == FOREGROUND_NOTE_ID) {
            isForegroundNotificationVisible = true;
            break;
    Log.v(getClass().getSimpleName(), "Is foreground visible: " + isForegroundNotificationVisible);
    if (isForegroundNotificationVisible){
        notificationManager.notify(FOREGROUND_NOTE_ID, buildForegroundNotification(action));
    } else {
        startForeground(FOREGROUND_NOTE_ID, buildForegroundNotification(action));
}

private Notification buildForegroundNotification(@NonNull String action) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        createNotificationChannel();
    //Do any customization you want here
    String title;
    if (ACTION_STOP.equals(action)) {
        title = getString(R.string.fg_notitifcation_title_stopping);
    } else {
        title = getString(R.string.fg_notitifcation_title_starting);
    //then build the notification
    return new NotificationCompat.Builder(this, CHANNEL_ID)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(title)
            .setOngoing(true)
            .build();
@RequiresApi(Build.VERSION_CODES.O)
private void createNotificationChannel(){
    NotificationChannel chan = new NotificationChannel(CHANNEL_ID, getString(R.string.fg_notification_channel), NotificationManager.IMPORTANCE_DEFAULT);

如何更新Android前台服务的通知文本？

3 个回答