java-使用融合的位置提供程序获取当前位置

概述我有此活动想要获取当前位置,但现在没有如何以正确的方式完成它..REQUEST_CODE_ASK_PERMISSIONS是什么？我必须生成一个吗？publicclassMainActivityextendsAppCompatActivityimplementsGoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedList

我有此活动想要获取当前位置,但现在没有如何以正确的方式完成它..REQUEST_CODE_ASK_PERMISSIONS是什么？
我必须生成一个吗？

public class MainActivity extends AppCompatActivity implements Googleapiclient.ConnectionCallbacks,        Googleapiclient.OnConnectionFailedListener {    private double longitude;    private double latitude;    private TextVIEw latitudeText, longitudeText;    private FusedLocationProvIDerClIEnt fusedLocationProvIDerClIEnt;    private Googleapiclient Googleapiclient;    private LocationManager locationManager;    private LocationListener locationListener;    private LocationRequest locationRequest;    private LocationCallback locationCallback;    final private int REQUEST_CODE_ASK_PERMISSIONS = 123;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        latitudeText = findVIEwByID(R.ID.latitudeText);        longitudeText = findVIEwByID(R.ID.longitudeText);        getLocation();    }    private voID getLocation() {        locationRequest = new LocationRequest()                .setInterval(2000).setFastestInterval(2000).setPriority(1000);        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()                .addLocationRequest(locationRequest);        SettingsClIEnt clIEnt = LocationServices.getSettingsClIEnt(this);        Task<LocationSettingsResponse> task = clIEnt.checkLocationSettings(builder.build());        locationCallback = new LocationCallback() {            @OverrIDe            public voID onLocationResult(LocationResult locationResult) {                for (Location location : locationResult.getLocations()) {                    latitude = location.getLatitude();                    longitude = location.getLongitude();                    latitudeText.setText(String.valueOf(latitude));                    longitudeText.setText(String.valueOf(longitude));                }            }        };        task.addOnSuccessListener(this, new OnSuccessListener<LocationSettingsResponse>() {            @OverrIDe            public voID onSuccess(LocationSettingsResponse locationSettingsResponse) {            }        });    }    @OverrIDe    protected voID onResume() {        super.onResume();        if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)                != PackageManager.PERMISSION_GRANTED){            ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest                    .permission.ACCESS_FINE_LOCATION},REQUEST_CODE_ASK_PERMISSIONS);        } else if(){        }        }    @OverrIDe    public voID onConnected(@Nullable Bundle bundle) {    }    @OverrIDe    public voID onConnectionSuspended(int i) {    }    @OverrIDe    public voID onConnectionFailed(@NonNull ConnectionResult connectionResult) {    }}

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解决方法:

在build.gradle(Module：app)中添加依赖项

implementation 'com.Google.androID.gms:play-services-location:16.0.0' 

声明清单中的必要权限

<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"/>

EasyLocationProvIDer.java

import androID.annotation.Suppresslint;import androID.arch.lifecycle.lifecycle;import androID.arch.lifecycle.lifecycleObserver;import androID.arch.lifecycle.OnlifecycleEvent;import androID.content.Context;import androID.content.IntentSender;import androID.os.Bundle;import androID.os.Looper;import androID.support.annotation.NonNull;import androID.support.annotation.Nullable;import androID.support.v7.app.AppCompatActivity;import androID.util.Log;import androID.Widget.Toast;import com.Google.androID.gms.common.ConnectionResult;import com.Google.androID.gms.common.GoogleAPIAvailability;import com.Google.androID.gms.common.API.APIException;import com.Google.androID.gms.common.API.Googleapiclient;import com.Google.androID.gms.common.API.ResolvableAPIException;import com.Google.androID.gms.location.FusedLocationProvIDerClIEnt;import com.Google.androID.gms.location.LocationCallback;import com.Google.androID.gms.location.LocationRequest;import com.Google.androID.gms.location.LocationResult;import com.Google.androID.gms.location.LocationServices;import com.Google.androID.gms.location.LocationSettingsRequest;import com.Google.androID.gms.location.LocationSettingsResponse;import com.Google.androID.gms.location.LocationSettingsstatusCodes;import com.Google.androID.gms.location.SettingsClIEnt;import com.Google.androID.gms.tasks.OnCanceledListener;import com.Google.androID.gms.tasks.OnFailureListener;import com.Google.androID.gms.tasks.OnSuccessListener;public class EasyLocationProvIDer implements lifecycleObserver {    private EasyLocationCallback callback;    private Context context;    private FusedLocationProvIDerClIEnt mFusedLocationClIEnt;    private SettingsClIEnt mSettingsClIEnt;    private LocationCallback mLocationCallback;    private LocationRequest mLocationRequest;    private Googleapiclient mGoogleapiclient;    private LocationSettingsRequest mLocationSettingsRequest;    private long interval;    private long fastestInterval;    private int priority;    private double Latitude = 0.0, Longitude = 0.0;    private EasyLocationProvIDer(final Builder builder) {        context = builder.context;        callback = builder.callback;        interval = builder.interval;        fastestInterval = builder.fastestInterval;        priority = builder.priority;    }    @Suppresslint("MissingPermission")    public voID requestLocationUpdate() {        mFusedLocationClIEnt.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());    }    private voID connectGoogleClIEnt() {        GoogleAPIAvailability GoogleAPI = GoogleAPIAvailability.getInstance();        int resultCode = GoogleAPI.isGooglePlayServicesAvailable(context);        if (resultCode == ConnectionResult.SUCCESS) {            mGoogleapiclient.connect();        } else {            int REQUEST_Google_PLAY_SERVICE = 988;            GoogleAPI.getErrorDialog((AppCompatActivity) context, resultCode, REQUEST_Google_PLAY_SERVICE);        }    }    @OnlifecycleEvent(lifecycle.Event.ON_CREATE)    private voID onCreateLocationProvIDer() {    }    @OnlifecycleEvent(lifecycle.Event.ON_RESUME)    private voID onLocationResume() {        buildGoogleapiclient();    }    @Suppresslint("MissingPermission")    private synchronized voID buildGoogleapiclient() {        mFusedLocationClIEnt = LocationServices.getFusedLocationProvIDerClIEnt(context);        mSettingsClIEnt = LocationServices.getSettingsClIEnt(context);        mGoogleapiclient = new Googleapiclient.Builder(context)                .addConnectionCallbacks(new Googleapiclient.ConnectionCallbacks() {                    @OverrIDe                    public voID onConnected(@Nullable Bundle bundle) {                        callback.onGoogleapiclient(mGoogleapiclient, "Connected");                        mLocationRequest = new LocationRequest();                        mLocationRequest.setInterval(interval);                        mLocationRequest.setFastestInterval(fastestInterval);                        mLocationRequest.setPriority(priority);                        mLocationRequest.setSmallestdisplacement(0);                        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();                        builder.addLocationRequest(mLocationRequest);                        builder.setAlwaysShow(true);                        mLocationSettingsRequest = builder.build();                        mSettingsClIEnt                                .checkLocationSettings(mLocationSettingsRequest)                                .addOnSuccessListener(new OnSuccessListener<LocationSettingsResponse>() {                                    @OverrIDe                                    public voID onSuccess(LocationSettingsResponse locationSettingsResponse) {                                        showLog("GPS is Enabled Requested Location Update");                                        requestLocationUpdate();                                    }                                }).addOnFailureListener(new OnFailureListener() {                            @OverrIDe                            public voID onFailure(@NonNull Exception e) {                                int statusCode = ((APIException) e).getStatusCode();                                switch (statusCode) {                                    case LocationSettingsstatusCodes.RESolUTION_required:                                        try {                                            int REQUEST_CHECK_SETTINGS = 214;                                            ResolvableAPIException rae = (ResolvableAPIException) e;                                            rae.startResolutionForResult((AppCompatActivity) context, REQUEST_CHECK_SETTINGS);                                        } catch (IntentSender.SendIntentException sIE) {                                            showLog("Unable to Execute Request");                                        }                                        break;                                    case LocationSettingsstatusCodes.SETTINGS_CHANGE_UNAVAILABLE:                                        showLog("Location Settings are Inadequate, and Cannot be fixed here. Fix in Settings");                                }                            }                        }).addOnCanceledListener(new OnCanceledListener() {                            @OverrIDe                            public voID onCanceled() {                                showLog("onCanceled");                            }                        });                    }                    @OverrIDe                    public voID onConnectionSuspended(int i) {                        connectGoogleClIEnt();                        callback.onGoogleapiclient(mGoogleapiclient, "Connection Suspended");                    }                })                .addOnConnectionFailedListener(new Googleapiclient.OnConnectionFailedListener() {                    @OverrIDe                    public voID onConnectionFailed(@NonNull ConnectionResult connectionResult) {                        callback.onGoogleapiclient(mGoogleapiclient, "" + connectionResult.getErrorCode() + " " + connectionResult.getErrorMessage());                    }                })                .addAPI(LocationServices.API)                .build();        connectGoogleClIEnt();        mLocationCallback = new LocationCallback() {            @OverrIDe            public voID onLocationResult(final LocationResult locationResult) {                super.onLocationResult(locationResult);                Latitude = locationResult.getLastLocation().getLatitude();                Longitude = locationResult.getLastLocation().getLongitude();                if (Latitude == 0.0 && Longitude == 0.0) {                    showLog("New Location Requested");                    requestLocationUpdate();                } else {                    callback.onLocationUpdated(Latitude, Longitude);                }            }        };    }    @Suppresslint("MissingPermission")    public voID removeUpdates() {        try {            callback.onLocationUpdateRemoved();        } catch (Exception e) {            e.printstacktrace();        }    }    private voID showLog(String message) {        Log.e("EasyLocationProvIDer", "" + message);    }    public interface EasyLocationCallback {        voID onGoogleapiclient(Googleapiclient Googleapiclient, String message);        voID onLocationUpdated(double latitude, double longitude);        voID onLocationUpdateRemoved();    }    public static class Builder {        private Context context;        private EasyLocationCallback callback;        private long interval = 10 * 1000;        private long fastestInterval = 5 * 1000;        private int priority = LocationRequest.PRIORITY_HIGH_ACCURACY;        public Builder(Context context) {            this.context = context;        }        public EasyLocationProvIDer build() {            if (callback == null) {                Toast.makeText(context, "EasyLocationCallback Listener can not be null", Toast.LENGTH_SHORT).show();            }            return new EasyLocationProvIDer(this);        }        public Builder setListener(EasyLocationCallback callback) {            this.callback = callback;            return this;        }        public Builder setInterval(long interval) {            this.interval = interval;            return this;        }        public Builder setFastestInterval(int fastestInterval) {            this.fastestInterval = fastestInterval;            return this;        }        public Builder setPriority(int priority) {            this.priority = priority;            return this;        }    }}

采用：

EasyLocationProvIDer easyLocationProvIDer; //Declare Global VariableeasyLocationProvIDer = new EasyLocationProvIDer.Builder(BottomNavigationActivity.this)                .setInterval(5000)                .setFastestInterval(2000)                //.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)                .setListener(new EasyLocationProvIDer.EasyLocationCallback() {                    @OverrIDe                    public voID onGoogleapiclient(Googleapiclient Googleapiclient, String message) {                        Log.e("EasyLocationProvIDer","onGoogleapiclient: "+message);                    }                    @OverrIDe                    public voID onLocationUpdated(double latitude, double longitude) {                        Log.e("EasyLocationProvIDer","onLocationUpdated:: "+ "Latitude: "+latitude+" Longitude: "+longitude);                    }                    @OverrIDe                    public voID onLocationUpdateRemoved() {                        Log.e("EasyLocationProvIDer","onLocationUpdateRemoved");                    }                }).build();getlifecycle().addobserver(easyLocationProvIDer);

删除位置更新回调

@OverrIDeprotected voID onDestroy() {    easyLocationProvIDer.removeUpdates();    getlifecycle().removeObserver(easyLocationProvIDer);    super.onDestroy();}

注意：授予棉花糖和更高版本的设备的权限

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