如何使用 FUSED LOCATION API 优化电池 - Android

Question

您好，我在 android 中遇到以下问题/问题与位置 API 相关

• 电池消耗高达 30% - 40%，导致大量电池消耗。

• 状态栏中的位置图标始终处于打开状态，即使在关闭应用和卸载应用时它也会自动关闭。

要求：

• 打开应用时需要用户位置。
• 即使应用程序未打开或未使用基于距离，我也需要用户位置 - 需要在后台使用用户位置。

方法：

1. 带 GPS

2. API 使用 FUSED LOCATION API 和未决意图。

3. LocationManager - 检查 GPS 开/关状态。

代码演练：

1. 在 OnCreate 中我正在获取位置管理器实例 - 获取位置管理器的实例。

2. 检查是否启用 GPS 或网络状态是否可用，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：在此方法中，我正在检查 android 版本、请求权限并启用服务

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("","");
            }
        }
    }

以待定意图在后台获取位置的方法

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：如果设备重启：

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();
        }
    }
}

我的意图服务类：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一定优先级和间隔的 GoogleApiClient 和 LocationRequest。 编写实现以下接口的服务：

1. GoogleApiClient.ConnectionCallbacks
2. GoogleApiClient.OnConnectionFailedListener

3. 位置监听器

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

使用 GoogleApiClient 和 LocationRequest 类。

进入 onCreate() 实例化一个 GoogleApiClient 对象、一个 LocationRequest 对象并让 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

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

请参考location strategies的官方文档，我的解决方案就是以此为基础的。

我习惯于在前台启动服务以防止操作系统的意外行为（例如服务被终止）

Answer 2

这只会更好地解释你的逻辑

而不是长时间运行的服务或 IntentService 只需使用 Firebase JobDispatcher 或任何 3rd Party 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！与长时间运行的服务相比，它确实是一个更好的解决方案！！！（您可以使用 eventBus 或 RxBus 在 Activity 或 Fragment 中进行位置更新！！）

提示：每次 Job 在 Job 关闭之前启动位置更新时，都会设置一些 3 秒或更长时间的系统延迟，因为有时 Googleapiclient 在延迟后需要更多时间来更新新更新的 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！

多合一作业作业调度程序库：https://github.com/evernote/android-job

P.S：代码会很快更新

Answer 3

文档states

在以下情况下，活动应强烈考虑删除所有位置请求 进入后台（例如在 onPause() 处），或至少交换 请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：

1. 我创建了两个位置请求，第一个的优先级为 PRIORITY_HIGH_ACCURACY，间隔为 1 分钟，而第二个的优先级为 PRIORITY_LOW_POWER，内部为 1小时，最小位移1公里
2. 应用启动时，我使用第一个位置请求（高优先级）来获得更频繁、更准确的位置更新
3. 当应用进入后台时，我切换到第二个位置请求（低优先级）以消除电池使用量，同时减少位置更新频率
4. （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%）选择应用在前台时可能要使用的位置请求

这些步骤帮助我将应用的电池使用量从 >30% 降低到