Question

在花了很多时间进行实验并尝试多种通话和设置组合之后，我缩小到这个范围：

Google Play服务位置API FusedLocationApi.requestLocationUpdates理想情况下，在启用任何位置服务时，应在指定的时间间隔内调用onLocationChanged。但是，实际行为是如此：

如果关闭所有位置服务，则永远不会调用onLocationChanged .......预期的行为
如果只启用了wifi /移动网络位置服务，则永远不会调用onLocationChanged .......意外行为
如果只启用了GPS定位服务，它就永远不会调用onLocationChanged（即使我们之后打开wifi定位服务）.......意外行为
如果GPS位置服务开启（打开第一个wifi /移动定位服务后），它会拨打onLocationChanged（并在我们之后关闭GPS后继续通话）.......预期的行为
如果打开wifi位置服务（打开第一个GPS位置服务后），它永远不会调用onLocationChanged .......意外行为

简而言之：只有先打开wifi然后再打开GPS，才会调用onLocationChanged。（但是，之后不再需要GPS来呼叫onLocationChanged）

这是我的代码：

void ConnectToLocationApi()
{
    // Create an instance of GoogleAPIClient.
    if(m_GoogleApiClient == null)
    {
        // Initialize Google Api client
        m_GoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

        // Connect to Google play service location api
        m_GoogleApiClient.connect();
    }
}


@Override
public synchronized void onConnected(Bundle bundle) // Called when m_GoogleApiClient.connect() succeeds
{
    Log.d(TAG, "GoogleApiClient connected");

    try
    {
        LocationRequest locationRequest;

        // Initialize location request
        locationRequest = new LocationRequest();
        locationRequest.setInterval(LOCATION_UPDATE_INTERVAL_IN_MILLISECONDS);
        locationRequest.setFastestInterval(FASTEST_LOCATION_UPDATE_INTERVAL_IN_MILLISECONDS);
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        // Start receiving location updates
        LocationServices.FusedLocationApi.requestLocationUpdates(m_GoogleApiClient, locationRequest, this);

        // Get location details of last available location (if any)
        Location lastLocation = LocationServices.FusedLocationApi.getLastLocation(m_GoogleApiClient);

        if (lastLocation != null)
        {
            ShowToast(this, "Last location received", Toast.LENGTH_SHORT);
            Log.i(TAG, "In onConnected. Latitude:" + m_Location.getLatitude() + ", Longitude: " + m_Location.getLongitude());
        }
        else
        {
            Log.e(TAG, "getLastLocation returned NULL value");
        }
    }
    catch (SecurityException e)
    {
        Log.e(TAG, "getLastLocation failed because of security exception (permission issue?)");
    }
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) // Called when m_GoogleApiClient.connect fails
{
    ShowToast(this, "GoogleApiClient connection failed", Toast.LENGTH_SHORT);
    m_GoogleApiClient = null;
    Log.e(TAG, "GoogleApiClient connection failed");
}

@Override
public void onConnectionSuspended(int i) // Called when m_GoogleApiClient.connect suspended
{
    Log.e(TAG, "GoogleApiClient connection suspended");
}

@Override
public synchronized void onLocationChanged(Location location)
{
    ShowToast(this, "Location update received", Toast.LENGTH_SHORT);
    Log.i(TAG, "In location changed. Latitude:" + location.getLatitude() + ", Longitude: " + location.getLongitude());
}

注意：在阅读this后，我更喜欢Android框架位置API上的Google Play服务位置API。有什么线索吗？我被困住了。

Answer 1

在我的情况下，问题在于倾听。如果我在获得位置和gps的预先安排之前启动了GoogleApi服务，那么OnLocationChanged从未调用过。所以在OnPermissionGrantedResult和reciver for android.location.PROVIDERS_CHANGED我正在重启GoogleApiServices并开始重新定位位置事件

仅在启用GPS后，FusedLocationApi.requestLocationUpdates才会触发调用onLocationChanged

1 个答案: