我正在从服务中注册广播接收器。如果设备位置不正确，我需要向用户显示通知，代码工作正常，但接收方无法创建通知。我可以看到有关更改位置状态的logcat消息，但未创建通知。请检查问题！有什么方法可以更新当前的服务通知吗？
这是服务：
public class LockService extends Service {
BroadcastReceiver mReceiver;
Handler handler;
LocationManager locationManager;
@Override
public IBinder onBind(Intent intent) {
return null;
}
private static final int NOTIF_ID = 1;
@Override
public void onCreate() {
final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
filter.addAction(LocationManager.PROVIDERS_CHANGED_ACTION);
mReceiver = new com.example.fizatanveerkhan.citycops.ScreenReceiver();
registerReceiver(mReceiver, filter);
super.onCreate();
}
private void startForeground() {
startForeground(NOTIF_ID, getMyActivityNotification(""));
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
this.startForeground();
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
if (mReceiver != null) {
unregisterReceiver(mReceiver);
mReceiver = null;
Log.i("onDestroy Reciever", "Called");
}
super.onDestroy();
}
public class LocalBinder extends Binder {
LockService getService() {
return LockService.this;
}
}
private Notification getMyActivityNotification(String text) {
CharSequence title = "new";
Notification notification = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String NOTIFICATION_CHANNEL_ID = " com.example.fizatanveerkhan.citycops";
String channelName = "My Background Service";
NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
chan.setLightColor(Color.BLUE);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager manager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
assert manager != null;
manager.createNotificationChannel(chan);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
notification = notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.abc)
.setContentTitle("Service running")
.setContentText("new")
.setPriority(NotificationManager.IMPORTANCE_MIN)
.setCategory(Notification.CATEGORY_SERVICE)
.build();
}
return notification;
}
/* public 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);
}*/
}
这是广播接收器：
public class ScreenReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;
private static final int POWER_OFF_TIMEOUT = 500;
private Handler handler = new Handler();
private Runnable powerOffCounterReset = new PowerOfTimeoutReset();
private int countPowerOff = 0;
private boolean screenOff;
//private LockService updateService = new LockService();
private final static String TAG = "LocationProviderChanged";
boolean isGpsEnabled;
boolean isNetworkEnabled;
@Override
public void onReceive(final Context context, final Intent intent) {
if (intent.getAction().matches("android.location.PROVIDERS_CHANGED")) {
Log.i(TAG, "Location Providers changed");
LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
isGpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
//Start your Activity if location was enabled:
if (isGpsEnabled || isNetworkEnabled) {
Log.i(TAG, "Location Providers on");
}
else {
Log.i(TAG, "Location Providers off");
Notification notification = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String NOTIFICATION_CHANNEL_ID = " com.example.fizatanveerkhan.citycops";
String channelName = "My Background Service";
NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
chan.setLightColor(Color.BLUE);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
assert manager != null;
manager.createNotificationChannel(chan);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
notification = notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.abc)
.setContentTitle("Service running")
.setContentText("new")
.setPriority(NotificationManager.IMPORTANCE_MIN)
.setCategory(Notification.CATEGORY_SERVICE)
.build();
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, notification);
}
}
}
我可以看到有关更改位置状态的logcat消息，但未创建通知
答案 0 :(得分：0)
更改通知代码可以解决问题
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String NOTIFICATION_CHANNEL_ID = "
com.example.fizatanveerkhan.citycops";
CharSequence name = "My Background Service";
String description = "My Background Service";
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, name, importance);
channel.setDescription(description);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
notification = notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.abc)
.setContentTitle("Service running")
.setContentText("new")
.setPriority(NotificationManager.IMPORTANCE_MIN)
.setCategory(Notification.CATEGORY_SERVICE)
.build();
NotificationManagerCompat notificationManagerq =
NotificationManagerCompat.from(context);
// notificationId is a unique int for each notification that you must define
notificationManagerq.notify(1, notificationBuilder.build());
}
答案 1 :(得分：0)
因此，基本上，您需要创建一个前台通知并在位置更改时更新其内容。
您可以使用以下代码创建前台通知：-
//for foreground service notification
public Notification showForegroundNotification(String notificationTitle, String notificationBody, Intent intent, ServiceName serviceName) {
String id = mContext.getString(R.string.upload_notification_channel_id);
PendingIntent lowIntent = PendingIntent.getActivity(mContext, 100, intent, PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(mContext, id);
NotificationManager mNotifyManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = mContext.getString(R.string.upload_notification_channel_name);
String description = mContext.getString(R.string.upload_notification_channel_description); //user visible
int importance = NotificationManager.IMPORTANCE_LOW;
AudioAttributes att = new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_NOTIFICATION)
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.build();
NotificationChannel mChannel = new NotificationChannel(id, name, importance);
mChannel.setDescription(description);
mChannel.enableLights(false);
mChannel.enableVibration(false);
mChannel.setVibrationPattern(new long[]{0L});
mChannel.setSound(null, att);
if (mNotifyManager != null) {
mNotifyManager.createNotificationChannel(mChannel);
}
notificationBuilder
.setSmallIcon(R.mipmap.ic_launcher)
.setCategory(NotificationCompat.CATEGORY_SERVICE)
.setVibrate(new long[]{0L})
.setSound(null)
.setColor(ContextCompat.getColor(mContext, R.color.colorPrimary))
.setContentTitle(notificationTitle)
.setAutoCancel(true)
.setContentIntent(lowIntent);
} else {
notificationBuilder.setContentTitle(notificationTitle)
.setSmallIcon(R.mipmap.ic_launcher)
.setCategory(NotificationCompat.CATEGORY_SERVICE)
.setVibrate(new long[]{0L})
.setSound(null)
.setColor(ContextCompat.getColor(mContext, R.color.colorPrimary))
.setAutoCancel(true)
.setContentIntent(lowIntent);
}
if (notificationBody != null) {
notificationBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(notificationBody));
}
notificationBuilder.setContentText(notificationBody);
return notificationBuilder.build();
}
，您需要调用startForegroundService（）;
private void startForegroundService(){
String dataTitle = SharedPrefer.getLastUpdatedLocationName();
String dataContent = SharedPrefer.getLastUpdatedLocation();
Intent intent = new Intent(WITHU.getAppContext(), MapLocateActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);
startForeground(121, showNotification.showForegroundNotification(dataTitle, dataContent, intent, ServiceName.SMART_LOCATION, -1, false));
}
因此它将传递更新的位置名称和位置，您可以从SharedPreference收集该位置，也可以直接在LocationChanged上调用它。