这个问题可能被问了很多次,但我找不到任何解决方案。 我需要在后台获取用户位置 15 分钟。
当 GPS 打开时,它工作正常,但当 GPS 关闭时,应用程序无法获取位置更新。我需要它至少获取网络位置或 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。因为 Google 建议开发人员使用播放服务 API 中的位置,所以我不想使用位置管理器。 我怎样才能实现这一目标,所以让我发布我迄今为止尝试过的内容:
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;
}
}
最佳答案
我不明白你说你不想使用位置管理器和 GPS...看看这个 Location Strategies ...基于此文档,我们有 3 种访问位置的策略:
- 全局定位系统
- 网络位置提供商
- 或同时使用
但对于您的位置问题,这是我的报价: 在 Activity 中,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 位置更新问题排查
位置更新应始终使用 GoogleApiClient
利用 LocationServices.API
完成,如上所示。不要使用较旧的位置 API,它们的可靠性要差得多。即使使用正确的 FusedLocationApi
,也有很多事情可能会出错。考虑以下潜在问题:
- 您是否添加了必要的权限?确保您的应用拥有
INTERNET
和ACCESS_COARSE_LOCATION
权限,以确保 可以按照上面指南中的说明访问位置。 - 调用时是否返回 null
LocationServices.FusedLocationApi.getLastLocation
? 这是正常现象 因为此方法仅在已有位置时返回 最近被另一个应用程序检索到。如果返回 null,则此 意味着您需要开始接收位置更新LocationServices.FusedLocationApi.requestLocationUpdates
之前 接收如上所示的位置。 - 您是否尝试获取 genymotion 模拟器的位置?确保 您已启用 GPS 并正确配置了纬度/经度。尝试重新启动 如果需要,模拟器并重新启用 GPS 或尝试设备(或 官方模拟器)来排除 genymotion 特定问题。
关于android - 即使 GPS 关闭,如何使用融合位置 API 获取位置更新?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40055001/