帶有PendingIntent的FusedLocationApi用於後臺位置更新。無法接收更新

谷歌的示例源代碼很容易在前端實現連續位置更新，但我仍然無法清楚地瞭解後臺位置更新如何使用FusedLocationApi和PendingIntent工作。帶有PendingIntent的FusedLocationApi用於後臺位置更新。無法接收更新

LocationService類：

public class LocationService extends IntentService { 
private static final String TAG = LocationService.class.getSimpleName(); 

private static final String ACTION_LOCATION_UPDATED = "location_updated"; 
private static final String ACTION_REQUEST_LOCATION = "request_location"; 

public static IntentFilter getLocationUpdatedIntentFilter() { 
    return new IntentFilter(LocationService.ACTION_LOCATION_UPDATED); 
} 

public static void requestLocation(Context context) { 
    Intent intent = new Intent(context, LocationService.class); 
    intent.setAction(LocationService.ACTION_REQUEST_LOCATION); 
    context.startService(intent); 
} 

public LocationService() { 
    super(TAG); 
} 

@Override 
protected void onHandleIntent(Intent intent) { 
    String action = intent != null ? intent.getAction() : null; 
    if (ACTION_REQUEST_LOCATION.equals(action)) { 
     onRequestLocation(); 
    } 
    else if(ACTION_LOCATION_UPDATED.equals(action)) { 
     onLocationUpdated(intent); 
    } 
} 

/** 
* Called when a location update is requested. We block until we get a result back. 
* We are using Fused Location Api. 
*/ 
private void onRequestLocation() { 
    Log.v(TAG, ACTION_REQUEST_LOCATION); 
    GoogleApiClient googleApiClient = new GoogleApiClient.Builder(this) 
      .addApi(LocationServices.API) 
      .build(); 

    // we block here 
    ConnectionResult connectionResult = googleApiClient.blockingConnect(10, TimeUnit.SECONDS); 

    if (connectionResult.isSuccess() && googleApiClient.isConnected()) { 

     Intent locationUpdatedIntent = new Intent(this, LocationService.class); 
     locationUpdatedIntent.setAction(ACTION_LOCATION_UPDATED); 

     // Send last known location out first if available 
     Location location = FusedLocationApi.getLastLocation(googleApiClient); 
     if (location != null) { 
      Intent lastLocationIntent = new Intent(locationUpdatedIntent); 
      lastLocationIntent.putExtra(
        FusedLocationProviderApi.KEY_LOCATION_CHANGED, location); 
      startService(lastLocationIntent); 
     } 

     // Request new location 
     LocationRequest mLocationRequest = new LocationRequest() 
       .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
     FusedLocationApi.requestLocationUpdates(
       googleApiClient, mLocationRequest, 
       PendingIntent.getService(this, 0, locationUpdatedIntent, 0)); 

     googleApiClient.disconnect(); 
    } else { 
     Log.e(TAG, String.format("Failed to connect to GoogleApiClient (error code = %d)", 
       connectionResult.getErrorCode())); 
    } 
} 

/** 
* Called when the location has been updated & broadcast the new location 
*/ 
private void onLocationUpdated(Intent intent) { 
    Log.v(TAG, ACTION_LOCATION_UPDATED); 

    // Extra new location 
    Location location = 
      intent.getParcelableExtra(FusedLocationProviderApi.KEY_LOCATION_CHANGED); 

    if (location != null) { 
     LatLng latLngLocation = new LatLng(location.getLatitude(), location.getLongitude()); 
     LocalBroadcastManager.getInstance(this).sendBroadcast(intent); 
    } 
} 
}

MainActivity 代碼看起來凌亂，所以我將分享一個驅動器鏈接代碼：https://drive.google.com/open?id=0B7QMYFlbkUpOVjkxMUtfenRLXzA

然而，我遵循了https://gist.githubusercontent.com/allenchi/c9659369c306752c0047/raw/16d6cd8e311013379e55b496d2b6d13347f418d6/gistfile1.txt

的例子

示例中的以下部分是我無法理解MainActivity中的位置的部分。如何使用廣播接收器接收位置更新？我還需要清楚瞭解在後臺運行的FusedLocation，以及如何利用它來實現實時GPS實時追蹤。當應用程序在使用PRIORITY_HIGH_ACCURACY模式每5秒後臺運行

@Override 
protected void onResume() { 
    super.onResume(); 
    if(checkPlayServices()) { 
     LocationService.requestLocation(this); 
     LocalBroadcastManager.getInstance(getActivity()) 
        .registerReceiver(locationReceiver, LocationService.getLocationUpdatedIntentFilter()); 
    } 
} 

@Override 
public void onResume() { 
    super.onResume(); 
    LocalBroadcastManager.getInstance(getActivity()).registerReceiver(
    locationReceiver, LocationService.getLocationUpdatedIntentFilter()); 
} 

@Override 
public void onPause() { 
    super.onPause(); 
    LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(locationReceiver); 
} 

private BroadcastReceiver locationReceiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     Location location = intent.getParcelableExtra(FusedLocationProviderApi.KEY_LOCATION_CHANGED); 
     if (location != null) { 
      LatLng latestLocation = new LatLng(location.getLatitude(), location.getLongitude()); 
      // do something with the location 
     } 
    } 
};

來源

2015-11-16 Vinay Reddy

在下面你的樣品可以接收位置更新。您將通過接收指示您位置座標的通知來看到這些更新。

我也想測試是否可以在該應用已被系統殺死後所獲得的更新，因爲它是說here：

公共抽象PendingResult requestLocationUpdates（GoogleApiClient客戶，LocationRequest請求的PendingIntent callbackIntent）

此方法適用於後臺用例，更具體用於接收位置更新，即使應用程序已被系統殺死，也可用於。爲此，請爲啓動的服務使用PendingIntent。

這就是爲什麼我在Activity的onBackPressed（）方法中調用System.exit（0）的原因，您當然可以忽略它。

的服務：

public class LocationService extends IntentService{ private static final String INTENT_SERVICE_NAME = LocationService.class.getName(); public LocationService() { super(INTENT_SERVICE_NAME); } @Override protected void onHandleIntent(Intent intent) { if (null == intent) { return; } Bundle bundle = intent.getExtras(); if (null == bundle) { return; } Location location = bundle.getParcelable("com.google.android.location.LOCATION"); if (null == location) { return; } if (null != location) { // TODO: Handle the incoming location Log.i(INTENT_SERVICE_NAME, "onHandleIntent " + location.getLatitude() + ", " + location.getLongitude()); // Just show a notification with the location's coordinates NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE); NotificationCompat.Builder notification = new NotificationCompat.Builder(this); notification.setContentTitle("Location"); notification.setContentText(location.getLatitude() + ", " + location.getLongitude()); notification.setSmallIcon(R.drawable.ic_audiotrack); notificationManager.notify(1234, notification.build()); } }

}

的活動：

public class MainActivity extends Activity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{ private GoogleApiClient googleApiClient; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); googleApiClient = new GoogleApiClient.Builder(this) .addApi(LocationServices.API) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .build(); } @Override public void onStart() { super.onStart(); googleApiClient.connect(); } @Override public void onStop() { super.onStop(); if (googleApiClient.isConnected()) { googleApiClient.disconnect(); } } @Override public void onBackPressed() { // Check whether you receive location updates after the app has been killed by the system System.exit(0); } @Override public void onConnected(Bundle bundle) { requestLocationUpdates(); } @Override public void onConnectionSuspended(int cause) { googleApiClient.connect(); } @Override public void onConnectionFailed(ConnectionResult result) { } public void requestLocationUpdates() { LocationRequest locationRequest = new LocationRequest() .setInterval(5 * 1000) .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); Intent intent = new Intent(this, LocationService.class); PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, pendingIntent); }

}

在清單中的權限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

來源

2016-11-25 14:12:33

帶有PendingIntent的FusedLocationApi用於後臺位置更新。無法接收更新

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