这个问题可能会被问到很多次，但我找不到任何解决方案。 我需要让用户在后台的位置持续15分钟。
GPS打开时工作正常，但当GPS关闭时，应用程序没有获得位置更新。我需要它至少获得网络位置或wifi位置。
如何使用融合位置API实现此目的。
位置管理器具有此功能，但位于融合位置。由于Google建议开发人员使用Play服务API中的Location，因此我不想使用位置管理器。 我怎样才能实现这一点，让我发布到目前为止我所尝试的内容：
import android.content.Context;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
/**
* Created by 4264 on 14-10-2016.
*/
public class Locationlistener implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,LocationListener {
private Location mlocation; // location
private double latitude; // latitude
private double longitude; // longitude
private GoogleApiClient mGAC;
private Context mContext;
public static final String TAG = "GPSresource";
private FusedLocationProviderApi fusedLocationProviderApi;
private LocationRequest locationRequest;
public Locationlistener(Context c)
{
mContext = c;
try {
buildGoogleApiClient();
mGAC.connect();
}
catch(Exception e)
{
Log.d(TAG,e.toString());
}
}
protected synchronized void buildGoogleApiClient() {
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_LOW_POWER);
locationRequest.setInterval(1);
locationRequest.setFastestInterval(1);
mGAC = new GoogleApiClient.Builder(mContext)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
public double getLatitude(){
if(mlocation != null){
latitude = mlocation.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (mlocation != null) {
longitude = mlocation.getLongitude();
}
// return longitude
return longitude;
}
public Location GetLocationBlocking() throws InterruptedException {
// String lat=String.valueOf(moCurrentLocation.getLatitude());
// String longt=String.valueOf(moCurrentLocation.getLongitude());
// Toast.makeText(oContext,"Lat"+lat+"long"+longt,Toast.LENGTH_SHORT).show();
return mlocation;
}
@Override
public void onConnected(Bundle bundle) {
Location oLocation = LocationServices.FusedLocationApi.getLastLocation(mGAC);
if (mGAC != null) {
mlocation = oLocation;
getLatitude();
getLongitude();
if (oLocation != null){
Log.d("lat",String.valueOf(mlocation.getLatitude()));
Log.d("long",String.valueOf(mlocation.getLongitude()));
}
else{
LocationServices.FusedLocationApi.requestLocationUpdates(mGAC, locationRequest, this);
} }}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
mlocation=location;
}
}
答案 0 :(得分：2)
我不明白当你说你不想使用位置管理器和GPS时......看看这个Location Strategies ...基于这个doc我们有3个策略来访问位置：
但是对于您的位置问题，这是我的提议： 在活动内部，输入以下内容以连接并开始接收位置更新：
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private long UPDATE_INTERVAL = 10 * 1000; /* 10 secs */
private long FASTEST_INTERVAL = 2000; /* 2 sec */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the location client to start receiving updates
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
}
protected void onStart() {
super.onStart();
// Connect the client.
mGoogleApiClient.connect();
}
protected void onStop() {
// Disconnecting the client invalidates it.
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
// only stop if it's connected, otherwise we crash
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onStop();
}
public void onConnected(Bundle dataBundle) {
// Get last known recent location.
Location mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
// Note that this can be NULL if last location isn't already known.
if (mCurrentLocation != null) {
// Print current location if not null
Log.d("DEBUG", "current location: " + mCurrentLocation.toString());
LatLng latLng = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
}
// Begin polling for new location updates.
startLocationUpdates();
}
@Override
public void onConnectionSuspended(int i) {
if (i == CAUSE_SERVICE_DISCONNECTED) {
Toast.makeText(this, "Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show();
} else if (i == CAUSE_NETWORK_LOST) {
Toast.makeText(this, "Network lost. Please re-connect.", Toast.LENGTH_SHORT).show();
}
}
// Trigger new location updates at interval
protected void startLocationUpdates() {
// Create the location request
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FASTEST_INTERVAL);
// Request location updates
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
}
然后使用onLocationChanged注册位置更新：
public void onLocationChanged(Location location) {
// New location has now been determined
String msg = "Updated Location: " +
Double.toString(location.getLatitude()) + "," +
Double.toString(location.getLongitude());
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
// You can now create a LatLng Object for use with maps
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
}
有关Fused Location API的更多信息，请参阅Make ypur app Location Aware 排查位置更新
应始终使用GoogleApiClient利用LocationServices.API完成位置更新，如上所示。不要使用较不可靠的旧位置API。即使使用正确的FusedLocationApi，也有很多可能出错的事情。考虑以下潜在问题：
INTERNET和ACCESS_COARSE_LOCATION权限以确保这一点
可以按照上面的指南中的说明访问位置。LocationServices.FusedLocationApi.getLastLocation？这很正常
因为此方法仅在已有位置时才返回
最近被另一个应用程序检索如果返回null，则为此
意味着您需要开始接收位置更新
LocationServices.FusedLocationApi.requestLocationUpdates之前
收到如上所示的位置。