Question

您好我正面临android下的位置API问题/问题

电池消耗高达30％ - 40％，导致大量电池耗尽。
状态栏中的位置图标始终为ON，即使应用已关闭且应用程序已卸载，它也会自动关闭。

要求：

打开应用时需要用户位置。
即使未根据距离打开应用程序或未使用应用程序，我也需要有用户位置 - 需要在后台使用用户位置。

方法：

使用GPS
API使用具有待定意图的FUSED LOCATION API。
LocationManager - 检查GPS开/关的状态。

代码walkthru：

在OnCreate中获取位置管理器实例 - 获取位置管理器的实例。

检查是启用GPS还是网络状态可用，否则显示对话框以启用位置：代码： -

// get GPS state.
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);


    if (isGPSLocationEnabled(locationManager)) {
        buildGooleLocationApiClient();
    } else if (isNetworkLocationEnabled(locationManager)) {
        buildGooleLocationApiClient();
    } else {
        showAlert();
    }

goolgeLocationAPiClient的代码：在这个方法中，我正在检查android版本，请求权限和启用服务

private void buildGooleLocationApiClient() {

        if (Build.VERSION.SDK_INT >= 23) {

            int isFineLocationPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
            int isCoarseLocationPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION);

            if (isFineLocationPermission == PackageManager.PERMISSION_DENIED || isCoarseLocationPermission == PackageManager.PERMISSION_DENIED) {
                requestPermission();
            } else {
                checkGoogleLocationApiClient();
            }

        } else {
            checkGoogleLocationApiClient();
        }
    }

构建GoogleAPI客户端：

private void checkGoogleLocationApiClient() {
        try {
            if (mGoogleApiClient != null) {
                if (mGoogleApiClient.isConnected()) {
                    getMyLocationCampaigns();
                } else {
                    mGoogleApiClient.connect();
                }
            } else {
                buildGoogleApiClient();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void getMyLocationCampaigns() {
        if (mCurrentLocation != null) {
            getData(mCurrentLocation.getLatitude()+"",mCurrentLocation.getLongitude()+"");
        } else {
            try {
                mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                getData(mCurrentLocation.getLatitude()+"",mCurrentLocation.getLongitude()+"");
            } catch (SecurityException ex) {
                ex.printStackTrace();
                getData("","");
            }
        }
    }

private synchronized void buildGoogleApiClient() {
        try {
            Log.i(TAG, "activity Building GoogleApiClient===");
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();

            createLocationRequest();
        } catch (Exception e) {
            e.printStackTrace();
            getData("","");
        }
    }


    private void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(60 * 60 * 1000);
        mLocationRequest.setFastestInterval(60 * 1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        mLocationRequest.setSmallestDisplacement(100);

        connectGoogleApiClient();
    }


private void connectGoogleApiClient() {
        if (mGoogleApiClient != null) {
            if (!mGoogleApiClient.isConnected())
                mGoogleApiClient.connect();
        }
    }


@Override
    public void onLocationChanged(Location location) {
        mCurrentLocation = location;
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {

        if (mCurrentLocation == null) {
            try {
                mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                if (mCurrentLocation != null) {
// MyAPICALL                    getData(mCurrentLocation.getLatitude()+"",mCurrentLocation.getLongitude()+"");
                } else {
                    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest, this);
                    mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                    if (mCurrentLocation == null) {
                        if (locationManager != null) {
                            String provider = Utils.getUserLastLocation(locationManager);
                            if (provider != null) {
                                try {
                                    Location location = locationManager.getLastKnownLocation(provider);
                                    if (location != null) {
                                        getData(location.getLatitude() + "", location.getLongitude() + "");
                                    } else {
                                        getData("", "");
                                    }
                                } catch (SecurityException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    } else {
                        getData(mCurrentLocation.getLatitude()+"",mCurrentLocation.getLongitude()+"");
                    }
                }
            } catch (SecurityException ex) {
                ex.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
                getData("","");
            }
        }
    }

具有待定意图的背景中的getlocation方法

private void startLocationUpdates() {
        try {


            Intent receiverIntentService = new Intent(this, LocationIntentService.class);
            PendingIntent pendingIntent = PendingIntent.getService(this, 1, receiverIntentService, 0);

            if (mGoogleApiClient != null) {
                if (mGoogleApiClient.isConnected()) {
                    LocationServices.FusedLocationApi.requestLocationUpdates(
                            mGoogleApiClient, mLocationRequest, pendingIntent);
                }

            }
        } catch (SecurityException se) {
            se.printStackTrace();
        }
    }

BroadCastReceiver：如果设备重新启动：

public class LocationBroadcastReceiver extends BroadcastReceiver implements
        GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener, LocationListener {


    Context context;
    protected GoogleApiClient mGoogleApiClient;
    protected LocationRequest mLocationRequest;
    protected Location mCurrentLocation;
    public static Boolean mRequestingLocationUpdates = false;

    SharedPreferences checkUserStatus;

    public LocationBroadcastReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        try {
            this.context = context;

            checkUserStatus = context.getSharedPreferences(Params.LOGIN_DETAILS_PREFERENCE, 0);
            String isUserLogedIn = checkUserStatus.getString(Params.TOKEN,"");

// if user is still logged in then only trigger background service
            if (!isUserLogedIn.equals("")) {
                buildGoogleApiClient();
                if (mGoogleApiClient != null) {
                    if (mGoogleApiClient.isConnected() && mRequestingLocationUpdates) {
                        startLocationUpdates();
                    } else {
                        buildGoogleApiClient();
                    }
                } else {
                    buildGoogleApiClient();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    @Override
    public void onConnected(Bundle bundle) {
        startLocationUpdates();
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }


    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.i("Broadcast receiver", "Connection failed: ConnectionResult.getErrorCode() = " + connectionResult.getErrorCode());
    }


    @Override
    public void onLocationChanged(Location location) {
        mCurrentLocation = location;
    }


    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(context)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

        createLocationRequest();
    }



    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(60 * 60 * 1000);
        mLocationRequest.setFastestInterval(60 * 1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        mLocationRequest.setSmallestDisplacement(100);

    }

    protected void startLocationUpdates() {
        try {


            Intent receiverIntentService = new Intent(context,LocationIntentService.class);
            PendingIntent pendingIntent = PendingIntent.getService(context,1,receiverIntentService,0);

            LocationServices.FusedLocationApi.requestLocationUpdates(
                    mGoogleApiClient, mLocationRequest, pendingIntent);


        }catch (SecurityException se) {
            se.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

我的意向服务类：获取用户更新的位置并进行API调用

public class LocationIntentService extends IntentService {

    Context context;
    Bitmap myBitmap;

    URL url;

    SharedPreferences.Editor mMyLastLocationHolder;
    SharedPreferences mMyLastLocation;

    SharedPreferences checkUserStatus;


    public LocationIntentService() {
        super("LocationIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        if (intent != null) {
            Bundle bundle = intent.getExtras();
            if (bundle != null) {
                Location location = bundle.getParcelable("com.google.android.location.LOCATION");
                if (location != null) {
                    context = getApplicationContext();
// API call to server
                    updateAPI(location.getLatitude()+"",location.getLongitude()+"");

                    Log.v("TAG LOCATION ", " ==== " + location.getLatitude() + " - " + location.getLongitude() + " ==== ");
                    Log.v("TAG LOCATION ", " ==== calling my-campaigns near me ========");
                }
            }
        }

    }




    /**
     * Handle action Foo in the provided background thread with the provided
     * parameters.
     */
    private void handleActionFoo(String param1, String param2) {
        // TODO: Handle action Foo
        throw new UnsupportedOperationException("Not yet implemented");
    }

    /**
     * Handle action Baz in the provided background thread with the provided
     * parameters.
     */
    private void handleActionBaz(String param1, String param2) {
        // TODO: Handle action Baz
        throw new UnsupportedOperationException("Not yet implemented");
    }



}

Answer 1

我希望这可以帮助您找到最佳解决方案/方法。

个人更喜欢使用具有特定优先级和间隔的GoogleApiClient和LocationRequest。编写实现以下接口的服务：

GoogleApiClient.ConnectionCallbacks
GoogleApiClient.OnConnectionFailedListener
LocationListener的

public class PositionService extends Service implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {}

使用GoogleApiClient和LocationRequest类。

进入 onCreate（） 实例化GoogleApiClient对象，LocationRequest对象并使mGoogleApiClient连接。

public void onCreate() {
    mGoogleApiClient = new GoogleApiClient.Builder(this)
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .addApi(LocationServices.API)
                        .build();
    mLocationRequest = LocationRequest.create()
                    .setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY)
                 .setInterval(mInterval).setFastestInterval(mFastInterval);
    mGoogleApiClient.connect();
}

进入 onDestroy（） 方法，使mGoogleApiClient断开连接

@Override
public void onDestroy() {
    mGoogleApiClient.disconnect();
}

现在实现接口

@Override
public void onLocationChanged(Location location) {

    Log.d("NewLocation", location.toString());

}

@Override
public void onConnected(@Nullable Bundle bundle) throws SecurityException {
    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}

@Override
public void onConnectionSuspended(int i) {

}

@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

}

现在GoogleApiClient会根据LocationRequest的设置通知您调用 onLocationChanged（） 回调的位置

您的业务逻辑应放在 onLocationChanged（） 方法中。只需为LocationRequest选择一个良好的间隔时间和优先级。（见documentation）

请参阅有关location strategies的官方文档，我的解决方案就是基于此。

我习惯于在Foreground中启动服务以防止操作系统出现意外行为（例如服务被杀）

Answer 2

这只会向您解释更好的逻辑

而不是长时间运行的服务或IntentService只需使用Firebase JobDispatcher或任何第三方lib Jobscheduler API，以便将所有位置更新代码移动到Jobscheduler（https://github.com/googlesamples/android-JobScheduler/blob/master/Application/src/main/java/com/example/android/jobscheduler/service/MyJobService.java）

根据您的位置更新间隔启动作业，根据您的要求配置或更改作业！与长期运行的服务相比，它确实是一个更好的解决方案!!!（您可以在Activity或片段中使用eventBus或RxBus进行位置更新!!）

提示：每次作业开始时，在作业关闭之前触发位置更新设置一些系统延迟3秒或更长时间，因为有些时候Googleapiclient需要更多时间来更新延迟后更新新的GPS时间您可以使用正在运行的JobService关闭Googleapiclient所有不需要的回调。通过检测用户活动，使用Google Awareness Api或Google Fit API智能地控制作业配置！

一体化Job Jobscheduler Lib：https://github.com/evernote/android-job

P.S：代码将很快更新

Answer 3

文档link

活动应该强烈考虑在何时删除所有位置请求进入后台（例如在onPause（）），或至少交换要求更大的间隔和更低的质量。

因此，当我遇到类似问题时，我所做的是：

我创建了两个位置请求，第一个请求优先级为 PRIORITY_HIGH_ACCURACY ，间隔为1分钟，而第二个请求优先级为 PRIORITY_LOW_POWER ，内部为1小时和最小位移1km
启动应用程序时，我使用第一个位置请求（高优先级）来获得更频繁和准确的位置更新
当应用程序进入后台时，我会切换到第二个位置请求（低优先级）以消除电池使用情况，同时减少位置更新频率
（可选）您还可以在应用启动时获取电池百分比，并根据限制（例如15％）选择当应用处于前台时您可能想要使用的位置请求

这些步骤帮助我将应用的电池使用量从> 30％降低到<3％。

如何使用FUSED LOCATION API优化电池 - Android

3 个答案: