Question

当我使用网络提供商在Android上跟踪用户位置时，当单元格处于睡眠（暂停）模式时，我会在很长时间内反对更新。这篇文章同样的问题： Android network location takes hours to update location。

我正在使用AlarmManager触发使用PARTIAL_WAKE_LOCK启动服务的意图，等待从侦听器接收位置更新并自行停止（释放唤醒锁）。

所有功能都可以完美地使用GPS提供商。所有权限都可以（精细/粗略位置，唤醒锁）。

有什么想法吗？谢谢！

修改此问题导致的问题：http://code.google.com/p/android/issues/detail?id=10931

Answer 1

您是否有任何逻辑可以验证新位置是否更适合显示？可能是旧位置始终被视为更好的位置，直到遇到某种情况。请尝试以下代码段：

private static final int TWO_MINUTES = 1000 * 60 * 2;

/** Determines whether one Location reading is better than the current Location fix
  * @param location  The new Location that you want to evaluate
  * @param currentBestLocation  The current Location fix, to which you want to compare the new one
  */
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
    if (currentBestLocation == null) {
        // A new location is always better than no location
        return true;
    }

    // Check whether the new location fix is newer or older
    long timeDelta = location.getTime() - currentBestLocation.getTime();
    boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
    boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
    boolean isNewer = timeDelta > 0;

    // If it's been more than two minutes since the current location, use the new location
    // because the user has likely moved
    if (isSignificantlyNewer) {
        return true;
    // If the new location is more than two minutes older, it must be worse
    } else if (isSignificantlyOlder) {
        return false;
    }

    // Check whether the new location fix is more or less accurate
    int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
    boolean isLessAccurate = accuracyDelta > 0;
    boolean isMoreAccurate = accuracyDelta < 0;
    boolean isSignificantlyLessAccurate = accuracyDelta > 200;

    // Check if the old and new location are from the same provider
    boolean isFromSameProvider = isSameProvider(location.getProvider(),
            currentBestLocation.getProvider());

    // Determine location quality using a combination of timeliness and accuracy
    if (isMoreAccurate) {
        return true;
    } else if (isNewer && !isLessAccurate) {
        return true;
    } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
        return true;
    }
    return false;
}

/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
    if (provider1 == null) {
      return provider2 == null;
    }
    return provider1.equals(provider2);
}

Answer 2

问题是网络提供商非常不准确。（大致在3km的范围内）因此，位置更新缓慢，您必须从一个小区站点移动到另一个小区站点。

编辑：事实证明，这是a known issue

Android网络位置（获取更新的时间）

2 个答案: