[英]How does it work - requestLocationUpdates() + LocationRequest/Listener
I am new Android coder and I have problem with requesting updates for my localization. 我是新的Android编码器,在为本地化请求更新时遇到问题。
I working with tutorials from http://developer.android.com/training/location/receive-location-updates.html . 我正在使用http://developer.android.com/training/location/receive-location-updates.html中的教程。
My application can handle exceptions, getting latitude and longitute properly, and geocoder can handle displaying the adress. 我的应用程序可以处理异常,适当地获得纬度和经度,而Geocoder可以处理显示地址。 But I ask for location only once - or when location changes.
但我只要求一次位置-或位置更改时。 I would like to do time intervals.
我想做一些时间间隔。 For now I started implementing code from the tutorials and it looks like that:
现在,我开始从教程中实现代码,看起来像这样:
public class MainActivity extends Activity implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener {
private static final int MILLISECONDS_PER_SECOND = 1000;
public static final int UPDATE_INTERVAL_IN_SECONDS = 5;
private static final long UPDATE_INTERVAL =
MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
private static final int FASTEST_INTERVAL_IN_SECONDS = 1;
private static final long FASTEST_INTERVAL =
MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
private TextView tvStatus;
private TextView tvLatitude;
private TextView tvLongitude;
LocationRequest mLocationRequest;
LocationClient mLocationClient;
Location mCurrentLocation;
boolean bNetworkEnabled;
boolean bGPSEnabled;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvStatus = (TextView)findViewById(R.id.tvStatus);
tvLatitude = (TextView)findViewById(R.id.tvLatitude);
tvLongitude = (TextView)findViewById(R.id.tvLongitude);
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationClient = new LocationClient(this, this, this);
checkProviders();
}
So there are already intervals implemented and location request. 因此,已经实现了间隔和位置请求。 But in the link I gave before there is a comment that I should use somewhere
requestLocationUpdates()
(probably onCreate()
, onStart()
and removal of request on onStop()
), but I have problem with it. 但是在我之前给出的链接中有一条评论,我应该在某处使用
requestLocationUpdates()
(可能是onCreate()
, onStart()
并删除onStop()
上的请求),但是我对此有onStop()
。 So, Eclipse shows me 3 methods: 因此,Eclipse向我展示了3种方法:
requestLocationUpdates(LocationRequest request, LocationListener listener)
requestLocationUpdates(LocationRequest request, PendingIntent CallbackIntent)
requestLocationUpdates(LocationRequest request, LocationListener listener, Looper looper)
So the first one I think is most right in this place. 因此,我认为第一个在这个地方最合适。 What should I place in
LocationListener
slot? 我应该在
LocationListener
插槽中放置什么? I ask for help with little explanation how it works. 我寻求帮助时几乎没有解释它是如何工作的。
You are implementing LocationListener in your activity MainActivity. 您正在活动MainActivity中实现LocationListener。 The call for concurrent location updates will therefor be like this:
因此,并发位置更新的调用将如下所示:
mLocationClient.requestLocationUpdates(mLocationRequest, this);
Be sure that the LocationListener you're implementing is from the google api, that is import this: 确保您要实现的LocationListener来自google api,即导入以下内容:
import com.google.android.gms.location.LocationListener;
and not this: 而不是这样:
import android.location.LocationListener;
and it should work just fine. 它应该可以正常工作。
It's also important that the LocationClient really is connected before you do this. 在执行此操作之前,必须真正连接LocationClient,这一点也很重要。 I suggest you don't call it in the onCreate or onStart methods, but in onResume.
我建议您不要在onCreate或onStart方法中调用它,而应在onResume中调用它。 It is all explained quite well in the tutorial for Google Location Api: https://developer.android.com/training/location/index.html
在Google Location Api的教程中对此进行了很好的解释: https : //developer.android.com/training/location/index.html
I use this one: 我用这个:
LocationManager.requestLocationUpdates(String provider, long minTime, float minDistance, LocationListener listener)
For example, using a 1s interval: 例如,使用1s间隔:
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);
the time is in milliseconds, the distance is in meters. 时间以毫秒为单位,距离以米为单位。
This automatically calls: 这会自动调用:
public void onLocationChanged(Location location) {
//Code here, location.getAccuracy(), location.getLongitude() etc...
}
I also had these included in the script but didnt actually use them: 我也将这些包含在脚本中,但实际上并未使用它们:
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
In short: 简而言之:
public class GPSClass implements LocationListener {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
Log.i("Message: ","Location changed, " + location.getAccuracy() + " , " + location.getLatitude()+ "," + location.getLongitude());
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.