我正在开发一款Android应用，我在这方面还是绿色。
在我的应用程序中，我使用FusedLocationApi来获取最后知道位置并进行位置更新请求，我遇到了问题，即使在Android Studio模拟器和三星Galaxy S5上激活了位置和WiFi，我也是从来没有得到LocationListener的onLocationChanged（）调用。
这是我的代码：
package com.trackit.app.locationupdatetest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
private static final String TAG = MapsActivity.class.getSimpleName();
public static final String STARTING_POSITION = "Rio de Janeiro"; //Application's default position
public static final int MY_PERMISSIONS_REQUEST_FINE_LOCATION = 1; //Fine location permission
private GoogleMap mMap;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private MapsActivity mActivity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
(findViewById(R.id.Location)).setEnabled(false);
(findViewById(R.id.StreetView)).setEnabled(false);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
if (mGoogleApiClient == null)
buildGoogleAPIClient();
//Create and configure a Location Request object to used while looking for location updates
if(mLocationRequest == null)
buildLocationRequest();
mActivity = this;
}
private synchronized void buildGoogleAPIClient() {
//Configuring the Google API client before connect
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
private synchronized void buildLocationRequest() {
mLocationRequest = LocationRequest.create()
.setInterval(10000)
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setFastestInterval(1000)
.setSmallestDisplacement(1);
}
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
/**
* This method is called when the Activity is no longer visible to the user.
*/
@Override
protected void onStop() {
if(mGoogleApiClient.isConnected())
mGoogleApiClient.disconnect();
super.onStop();
}
/**
* This callback is triggered when the map is ready to be used.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
public void buttonPressed(View buttonPressed){
displayUserLocation();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
(findViewById(R.id.Location)).setEnabled(true);
(findViewById(R.id.StreetView)).setEnabled(true);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.e(TAG,"onConnectionFailed:"+connectionResult.getErrorCode()+","+connectionResult.getErrorMessage());
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull
int[] grantResults) {
//Process the user permission's response
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_FINE_LOCATION:
processLocationPermissionResult(grantResults);
break;
default:
}
}
public void processLocationPermissionResult(@NonNull int grantResults[]) {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED)
displayLocation();
else {} // permission denied, boo! Disable the functionality that depends on this permission.
}
public void displayUserLocation(){
//Verify if the app have permission to access user's location
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.
ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.
permission.ACCESS_FINE_LOCATION)) {
//Asks the permission to access the user's location
Toast.makeText(this, "This app needs to access your location. " +
"Allow the app to access it?", Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
MapsActivity.MY_PERMISSIONS_REQUEST_FINE_LOCATION);
}
} else displayLocation(); //If the permission was granted
}
public void displayLocation() throws SecurityException{
Location lastLocation = LocationServices.FusedLocationApi.
getLastLocation(mGoogleApiClient);
if(lastLocation != null) {
Log.e(TAG, "!!!!!!");
LatLng position = new LatLng(lastLocation.getLatitude(), lastLocation.
getLongitude());
mMap.addMarker(new MarkerOptions().position(position).title("Marker in " +
MapsActivity.STARTING_POSITION));
mMap.moveCamera(CameraUpdateFactory.newLatLng(position));
} else{
Log.e(TAG, "??????");
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
}
}
@Override
public void onLocationChanged(Location location) {
if(location.getAccuracy() < 10 && location.getSpeed() < 55.55555555555556){
Log.e(TAG, "onLocationChanged() started");
LatLng position = new LatLng(location.getLatitude(), location.getLongitude());
mMap.addMarker(new MarkerOptions().position(position).title("Marker in " +
MapsActivity.STARTING_POSITION));
mMap.moveCamera(CameraUpdateFactory.newLatLng(position));
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
Log.e(TAG, "onLocationChanged() terminated");
}
/*else{
//Continue listening for a more accurate location
}*/
}
}
以下是我的AndroidManifest.xml和我的gradle：
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.trackit.app.locationupdatetest">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
摇篮
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.1"
defaultConfig {
applicationId "com.trackit.app.locationupdatetest"
minSdkVersion 21
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.google.android.gms:play-services:9.4.0'
}
我本周搜索了很多，但我还没有得到有用的答案= s
这些是我搜索过的一些主题（我不想看起来像个懒人，因为我不是，我只是被卡住了）
onLocationChanged does not get called using fusedLocationAPI.requestLocationUpdates
Unable to get location updates
onLocationChanged not called on some devices
on locaton changed never gets called in android google client api
onLocationChanged isn't being called
有人可以指出我的错误吗？ = S
答案 0 :(得分：1)
这是另一个答案。
为了永远调用onlocationChanged，有一行代码至关重要：
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
在您的情况下，此代码非常深入地存在于您的代码中，需要满足许多条件才能达到此目的：
您需要的条件：
我会考虑在您的代码中添加MORE LOGS，以确定这些条件实际上已得到满足......从以下方向追溯：
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
PS - 我看到你正在使用Android N权限模型。由于它似乎造成的混乱，我还没有把我的脚趾放在水里...我只是设置我的目标SDK = 22. :)
答案 1 :(得分：0)
我冒昧地回答这个问题......如果它有用，那就太棒了......如果没有，抱歉......
我有一个使用FusedLocationprovider的类似Activity。
我不是专家，不能说你为什么不工作，但我的工作正常，我注意到以下不同之处：
您的代码：
private synchronized void buildGoogleAPIClient() {
//Configuring the Google API client before connect
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
private synchronized void buildLocationRequest() {
mLocationRequest = LocationRequest.create()
.setInterval(10000)
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setFastestInterval(1000)
.setSmallestDisplacement(1);
}
我的代码：
protected synchronized void buildGoogleApiClient() {
this.mGoogleApiClient = new GoogleApiClient.Builder(this).
addConnectionCallbacks(this).
addOnConnectionFailedListener(this).
addApi(LocationServices.API).build();
createLocationRequest();
}
protected void createLocationRequest() {
this.mLocationRequest = new LocationRequest();
this.mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
this.mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
this.mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
的差异：
1）你说：
if(mLocationRequest == null)
buildLocationRequest();
。这有必要吗？在onCreate（）？
中，mLocationRequest总是为空2）你的方法是私人的，受到地雷保护
3）您的createLocationrequest（）标记为＆＃39; synchronized＆＃39; ......因此可能无法正常工作？
4）你使用setSmallestDisplacement（）方法。我看过帖子说这个方法不能正常工作，导致onLocationChanged（）没有被调用。
5）您使用以下内容实例化您的LocationRequest：＆＃39; LocationRequest.create（）＆＃39;而不是＆＃34;新的LocationRequest（）＆＃39;这可能是问题吗？
这有帮助吗？