奥利奥 - 在前台启动服务
Oreo - Starting a service in the foreground
我创建了一项服务,可以在设备移动时跟踪其位置。该服务由绑定到它的 Activity 启动,在这个 activity 中有一个 "Start Tracking" 按钮。按下此按钮时,我需要服务在前台启动,以便它存储设备移动到的位置,即使绑定到它的 Activity 已关闭,或者应用程序已最小化。
我了解要使服务位于前台,必须显示通知。我已经尝试这样做,但是当 activity 被销毁时,我无法获得显示的通知或在前台工作的服务。
由于通知渠道的原因,Oreo 中的通知似乎发生了变化,但我不知道需要做哪些不同的事情。我正在测试的设备是 8.0.0.
这是我的服务:
public class LocationTrackerService extends Service {
private LocationListener locationListener;
private LocationManager locationManager;
private IBinder binder = new LocalBinder();
private boolean isTracking;
private ArrayList<Location> trackedWaypoints;
private String bestProvider;
private Timer timer;
private Distance distance;
@SuppressLint("MissingPermission")
@Override
public void onCreate() {
super.onCreate();
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
bestProvider = locationManager.getBestProvider(criteria, true);
isTracking = false;
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Intent intent = new Intent("location_update");
intent.putExtra("latitude", location.getLatitude());
intent.putExtra("longitude", location.getLongitude());
sendBroadcast(intent);
if (isTracking) {
if (trackedWaypoints.size() > 1) {
distance.add(trackedWaypoints.get(trackedWaypoints.size() - 1).distanceTo(location));
}
trackedWaypoints.add(location);
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) { }
@Override
public void onProviderEnabled(String s) { }
@Override
public void onProviderDisabled(String s) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
};
locationManager.requestLocationUpdates(bestProvider, 0, 0, locationListener);
}
@Override
public void onDestroy() {
super.onDestroy();
if (locationManager != null) {
locationManager.removeUpdates(locationListener);
}
}
public void startTracking() {
trackedWaypoints = new ArrayList<Location>();
timer = new Timer();
distance = new Distance();
timer.start();
isTracking = true;
startInForeground();
}
private void startInForeground() {
Intent notificationIntent = new Intent(this, WorkoutActivity.class);
PendingIntent pendingIntent =
PendingIntent.getActivity(this, 0, notificationIntent, 0);
Notification notification =
new Notification.Builder(this)
.setContentTitle("TEST")
.setContentText("HELLO")
.setSmallIcon(R.drawable.ic_directions_run_black_24dp)
.setContentIntent(pendingIntent)
.setTicker("TICKER")
.build();
startForeground(101, notification);
}
public void stopTracking() {
isTracking = false;
stopForeground(true);
}
public boolean isTracking() {
return isTracking;
}
public ArrayList<Location> getTrackedWaypoints() {
return trackedWaypoints;
}
public Timer getTime() {
timer.update();
return timer;
}
public Distance getDistance() {
return distance;
}
public int getSteps() {
return 0;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return binder;
}
public class LocalBinder extends Binder {
public LocationTrackerService getLocationTrackerInstance() {
return LocationTrackerService.this;
}
}
}
在显示通知之前,您必须创建通知渠道:
private void createNotificationChannel() {
if (Build.VERSION_CODES.O <= Build.VERSION.SDK_INT) {
NotificationChannel notificationChannel =
new NotificationChannel(PRIMARY_CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(notificationChannel);
}
}
然后更改创建通知生成器
new Notification.Builder(context, PRIMARY_CHANNEL_ID)
尝试使用以下代码更改您的 startInForeground() 方法:
private void startInForeground() {
Intent notificationIntent = new Intent(this, WorkoutActivity.class);
PendingIntent pendingIntent=PendingIntent.getActivity(this,0,notificationIntent,0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,NOTIFICATION_CHANNEL_ID)
.setSmallIcon(R.drawable.shsl_notification)
.setContentTitle("TEST")
.setContentText("HELLO")
.setTicker("TICKER")
.setContentIntent(pendingIntent);
Notification notification=builder.build();
if(Build.VERSION.SDK_INT>=26) {
NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
channel.setDescription(NOTIFICATION_CHANNEL_DESC);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(channel);
}
startForeground(NOTIFICATION_ID, notification);
}
因此,当您的 Android 版本是 Oreo(或更高版本)时,将创建通知渠道,否则不会。
我创建了一项服务,可以在设备移动时跟踪其位置。该服务由绑定到它的 Activity 启动,在这个 activity 中有一个 "Start Tracking" 按钮。按下此按钮时,我需要服务在前台启动,以便它存储设备移动到的位置,即使绑定到它的 Activity 已关闭,或者应用程序已最小化。
我了解要使服务位于前台,必须显示通知。我已经尝试这样做,但是当 activity 被销毁时,我无法获得显示的通知或在前台工作的服务。
由于通知渠道的原因,Oreo 中的通知似乎发生了变化,但我不知道需要做哪些不同的事情。我正在测试的设备是 8.0.0.
这是我的服务:
public class LocationTrackerService extends Service {
private LocationListener locationListener;
private LocationManager locationManager;
private IBinder binder = new LocalBinder();
private boolean isTracking;
private ArrayList<Location> trackedWaypoints;
private String bestProvider;
private Timer timer;
private Distance distance;
@SuppressLint("MissingPermission")
@Override
public void onCreate() {
super.onCreate();
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
bestProvider = locationManager.getBestProvider(criteria, true);
isTracking = false;
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Intent intent = new Intent("location_update");
intent.putExtra("latitude", location.getLatitude());
intent.putExtra("longitude", location.getLongitude());
sendBroadcast(intent);
if (isTracking) {
if (trackedWaypoints.size() > 1) {
distance.add(trackedWaypoints.get(trackedWaypoints.size() - 1).distanceTo(location));
}
trackedWaypoints.add(location);
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) { }
@Override
public void onProviderEnabled(String s) { }
@Override
public void onProviderDisabled(String s) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
};
locationManager.requestLocationUpdates(bestProvider, 0, 0, locationListener);
}
@Override
public void onDestroy() {
super.onDestroy();
if (locationManager != null) {
locationManager.removeUpdates(locationListener);
}
}
public void startTracking() {
trackedWaypoints = new ArrayList<Location>();
timer = new Timer();
distance = new Distance();
timer.start();
isTracking = true;
startInForeground();
}
private void startInForeground() {
Intent notificationIntent = new Intent(this, WorkoutActivity.class);
PendingIntent pendingIntent =
PendingIntent.getActivity(this, 0, notificationIntent, 0);
Notification notification =
new Notification.Builder(this)
.setContentTitle("TEST")
.setContentText("HELLO")
.setSmallIcon(R.drawable.ic_directions_run_black_24dp)
.setContentIntent(pendingIntent)
.setTicker("TICKER")
.build();
startForeground(101, notification);
}
public void stopTracking() {
isTracking = false;
stopForeground(true);
}
public boolean isTracking() {
return isTracking;
}
public ArrayList<Location> getTrackedWaypoints() {
return trackedWaypoints;
}
public Timer getTime() {
timer.update();
return timer;
}
public Distance getDistance() {
return distance;
}
public int getSteps() {
return 0;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return binder;
}
public class LocalBinder extends Binder {
public LocationTrackerService getLocationTrackerInstance() {
return LocationTrackerService.this;
}
}
}
在显示通知之前,您必须创建通知渠道:
private void createNotificationChannel() {
if (Build.VERSION_CODES.O <= Build.VERSION.SDK_INT) {
NotificationChannel notificationChannel =
new NotificationChannel(PRIMARY_CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(notificationChannel);
}
}
然后更改创建通知生成器
new Notification.Builder(context, PRIMARY_CHANNEL_ID)
尝试使用以下代码更改您的 startInForeground() 方法:
private void startInForeground() {
Intent notificationIntent = new Intent(this, WorkoutActivity.class);
PendingIntent pendingIntent=PendingIntent.getActivity(this,0,notificationIntent,0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this,NOTIFICATION_CHANNEL_ID)
.setSmallIcon(R.drawable.shsl_notification)
.setContentTitle("TEST")
.setContentText("HELLO")
.setTicker("TICKER")
.setContentIntent(pendingIntent);
Notification notification=builder.build();
if(Build.VERSION.SDK_INT>=26) {
NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
channel.setDescription(NOTIFICATION_CHANNEL_DESC);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(channel);
}
startForeground(NOTIFICATION_ID, notification);
}
因此,当您的 Android 版本是 Oreo(或更高版本)时,将创建通知渠道,否则不会。