我使用带有 fused api 的已启动服务，并直接在其上实现位置侦听器。
即使屏幕锁定，位置也会持续更新，但如果屏幕关闭，位置就会停止。
那么，有没有什么方法可以确保屏幕关闭时位置保持更新呢？
我读了很多其他问题，但我真的不知道我错过了什么。
public class CLocationService extends Service implements GoogleApiClient.ConnectionCallbacks, LocationListener,
GoogleApiClient.OnConnectionFailedListener {
private GoogleApiClient mGoogleApiClient;
private PowerManager.WakeLock mWakeLock;
private LocationRequest mLocationRequest;
// Flag that indicates if a request is underway.
private boolean mInProgress;
private Boolean servicesAvailable = false;
private boolean isStarted;
public static final int LOCATION_SERVICE_NOTIFICATION_ID = 4567654;
private void showNotification() {
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
Notification notification = new Notification.Builder(this)
.setContentTitle(getText(R.string.app_name))
.setContentText("")
.setSmallIcon(R.mipmap.ic_notification)
.setContentIntent(pendingIntent)
.setTicker("")
.build();
startForeground(LOCATION_SERVICE_NOTIFICATION_ID, notification);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
setUpLocationClientIfNeeded();
startLocationServices();
}
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
protected synchronized void buildGoogleApiClient() {
this.mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
private boolean servicesConnected() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
return true;
} else {
return false;
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
PowerManager mgr = (PowerManager) getSystemService(Context.POWER_SERVICE);
/*
WakeLock is reference counted so we don't want to create multiple WakeLocks. So do a check before initializing and acquiring.
This will fix the "java.lang.Exception: WakeLock finalized while still held: MyWakeLock" error that you may find.
*/
if (this.mWakeLock == null) { //**Added this
this.mWakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
}
if (!this.mWakeLock.isHeld()) { //**Added this
this.mWakeLock.acquire();
}
if (!servicesAvailable || mGoogleApiClient.isConnected() || mInProgress)
return START_STICKY;
setUpLocationClientIfNeeded();
if (!mGoogleApiClient.isConnected() || !mGoogleApiClient.isConnecting() && !mInProgress) {
mInProgress = true;
mGoogleApiClient.connect();
}
return START_STICKY;
}
private void setUpLocationClientIfNeeded() {
if (mGoogleApiClient == null)
buildGoogleApiClient();
}
@Override
public void onDestroy() {
stopLocationServices();
super.onDestroy();
}
private void startLocationServices() {
mInProgress = false;
// Create the LocationRequest object
mLocationRequest = LocationRequest.create();
// Use high accuracy
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
// Set the update interval to 5 seconds
mLocationRequest.setInterval(5000);
// Set the fastest update interval to 1 second
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setSmallestDisplacement(0);
servicesAvailable = servicesConnected();
}
private void stopLocationServices() {
// Turn off the request flag
this.mInProgress = false;
if (this.servicesAvailable && this.mGoogleApiClient != null) {
this.mGoogleApiClient.unregisterConnectionCallbacks(this);
this.mGoogleApiClient.unregisterConnectionFailedListener(this);
this.mGoogleApiClient.disconnect();
// Destroy the current location client
this.mGoogleApiClient = null;
}
// Display the connection status
// Toast.makeText(this, DateFormat.getDateTimeInstance().format(new Date()) + ":
// Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show();
if (this.mWakeLock != null) {
this.mWakeLock.release();
this.mWakeLock = null;
}
}
private void cancelNotification() {
NotificationManager nMgr = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
nMgr.cancel(LOCATION_SERVICE_NOTIFICATION_ID);
}
@Override
public void onLocationChanged(Location location) {
// log the new location
}
@Override
public void onConnected(@Nullable Bundle bundle) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(this.mGoogleApiClient,
mLocationRequest, this); // This is the changed line.
}
@Override
public void onConnectionSuspended(int i) {
// Turn off the request flag
mInProgress = false;
// Destroy the current location client
mGoogleApiClient = null;
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
mInProgress = false;
/*
* Google Play services can resolve some errors it detects.
* If the error has a resolution, try sending an Intent to
* start a Google Play services activity that can resolve
* error.
*/
if (connectionResult.hasResolution()) {
// If no resolution is available, display an error dialog
} else {
}
}
}
