如何在GoogleApiClient

如何在GoogleApiClient

本文介绍了如何在GoogleApiClient onConnected()上返回值?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我使用GoogleApiClient获取用户位置。我创建了一个单例类来获取用户位置。这里是这个类:

  public class LocationUtils {

private static LocationUtils locationUtils;
私有GoogleApiClient googleApiClient;

public static LocationUtils getInstance(){

if(locationUtils == null)
locationUtils = new LocationUtils();
返回locationUtils;


private LocationUtils(){}

public Location getLocation(Context context){

final Location [] location = {空值};

googleApiClient = new GoogleApiClient.Builder(App.getContext())
.addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks(){
@Override
public void onConnected(Bundle Bundle){
if(ContextCompat.checkSelfPermission(App.getContext(),Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED)
location [0] = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);

googleApiClient.disconnect();
}

@Override
public void onConnectionSuspended(int i){

}
})
.addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener(){
@Override
public void onConnectionF ailed(ConnectionResult connectionResult){

}
})
.addApi(LocationServices.API)
.build();

googleApiClient.connect();

return location [0];

}



}

我想通过LocationUtils.getInstance()。getLocation(context)获取用户位置。当我调用getLocation()方法时,它应该连接到GoogleApiClient,返回用户位置并断开连接到每个调用的GoogleApiClient。但是当我调用该方法时,它将返回null。主线程不会等待onConnected()方法,并将位置对象返回为null。它如何等待onConnect()方法?或者我怎么能在onConnected()中返回Location对象?



已解决根据Tim Castelijns的回答

首先我创建了一个接口:

  public interface LocationCallbackInterface {
void onComplete(Location location);
}

然后在getLocationMethod()中使用它:



public void getLocation(Context context,final LocationCallbackInterface callback){

  final Location [] location = {空值}; 

googleApiClient = new GoogleApiClient.Builder(App.getContext())
.addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks(){
@Override
public void onConnected(Bundle Bundle){
if(ContextCompat.checkSelfPermission(App.getContext(),Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED){
location [0] = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
//Toast.makeText(App.getContext(),location came:+ location [0] .toString(),Toast.LENGTH_LONG).show();
callback.onComplete(location [ 0]);
}

googleApiClient.disconnect();
}

@Override
public void onConnectionSuspended(int i){

}
})
.addOnConnectionFailedListener(新的GoogleApiClient.OnConnect ctionFailedListener(){
@Override
public void onConnectionFailed(ConnectionResult connectionResult){

$ b})
.addApi(LocationServices.API)
.build();

googleApiClient.connect();

}

然后调用该方法一个活动:

$ $ p $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ b @Override
public void onComplete(Location location){
if(location!= null){
Toast.makeText(getActivity(),location:+ location.toString() ,Toast.LENGTH_SHORT).show();
initCamera(location);
} else
Toast.makeText(getActivity(),location is null,Toast.LENGTH_SHORT).show( );
}
});


解决方案

由于位置是异步获取的,因此您应该使用回调返回的位置,否则您的返回值将始终为空,因为googleApiClient尚未完成。



定义一个类似这样的接口

  public interface LocationCallback {
void onComplete(Location location);

更改

 public Location getLocation(Context context)

to

  public Location getLocation(Context context,LocationCallback callback)

并且像这样称呼它

  LocationUtils.getLocation(context,new LocationCallback(){
@Override
onComplete(位置位置){
//当调用这个函数时,您将获得一个位置
}
});


I am using GoogleApiClient to get user location. I created a singleton class to get user location. Here is that class:

public class LocationUtils {

    private static LocationUtils locationUtils;
    private GoogleApiClient googleApiClient;

    public static LocationUtils getInstance() {

        if(locationUtils == null)
            locationUtils = new LocationUtils();
        return locationUtils;
    }

    private LocationUtils() {}

    public Location getLocation(Context context){

        final Location[] location = {null};

        googleApiClient = new GoogleApiClient.Builder(App.getContext())
                .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                    @Override
                    public void onConnected(Bundle bundle) {
                        if(ContextCompat.checkSelfPermission(App.getContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
                            location[0] =  LocationServices.FusedLocationApi.getLastLocation(googleApiClient );

                        googleApiClient.disconnect();
                    }

                    @Override
                    public void onConnectionSuspended(int i) {

                    }
                })
                .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(ConnectionResult connectionResult) {

                    }
                })
                .addApi( LocationServices.API )
                .build();

        googleApiClient.connect();

        return location[0];

    }



}

I want to get user location with LocationUtils.getInstance().getLocation(context) . When i call getLocation() method, it should connect to GoogleApiClient, return user location and disconnect to GoogleApiClient for every call. But when i call that method, it returns null. The main thread does not wait for onConnected() method and returns location object as null. How can it waits for onConnect() method ? OR how can i return Location object in onConnected() ?

SOLVED according to Tim Castelijns's answer

First i created an interface:

public interface LocationCallbackInterface {
    void onComplete(Location location);
}

then used it in getLocationMethod() :

public void getLocation(Context context, final LocationCallbackInterface callback){

final Location[] location = {null};

googleApiClient = new GoogleApiClient.Builder(App.getContext())
        .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
            @Override
            public void onConnected(Bundle bundle) {
                if(ContextCompat.checkSelfPermission(App.getContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                    location[0] = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
                    //Toast.makeText(App.getContext(), "location came :" + location[0].toString(), Toast.LENGTH_LONG).show();
                    callback.onComplete(location[0]);
                }

                googleApiClient.disconnect();
            }

            @Override
            public void onConnectionSuspended(int i) {

            }
        })
        .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
            @Override
            public void onConnectionFailed(ConnectionResult connectionResult) {

            }
        })
        .addApi( LocationServices.API )
        .build();

googleApiClient.connect();

}

then called that method in an activity:

 LocationUtils.getInstance().getLocation(getActivity(), new LocationCallbackInterface() {

            @Override
            public void onComplete(Location location) {
                if (location != null) {
                    Toast.makeText(getActivity(), "location :" + location.toString(), Toast.LENGTH_SHORT).show();
                    initCamera(location);
                } else
                    Toast.makeText(getActivity(), "location is null", Toast.LENGTH_SHORT).show();
            }
        });
解决方案

Since the location is acquired asynchronously, you should use a callback to return the location, otherwise your return value will always be null because the googleApiClient is not done yet.

Define an interface like this

public interface LocationCallback {
    void onComplete(Location location);
}

Change

public Location getLocation(Context context)

to

public Location getLocation(Context context, LocationCallback callback)

and call it like this

LocationUtils.getLocation(context, new LocationCallback() {
    @Override
    onComplete(Location location) {
        // when this is called, you will have a location.
    }
});

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08-28 03:49