Android LocationManager标准

在其代码中,如果您使用两个提供商(来自GPS和网络),它将进行比较：

...
} else if (mUseBoth) {
    // Get coarse and fine LOCATIOn updates.
    mFineProviderButton.setBACkgroundresource(R.drawable.button_inactivE);
    mBothProviderButton.setBACkgroundresource(R.drawable.button_activE);
    // request updates from both fine (gps) and coarse (network) providers.
    gpsLOCATIOn = requestupdatesFromProvider(
            LOCATIOnManager.GPS_PROVIDER,R.String.not_support_gps);
    networkLOCATIOn = requestupdatesFromProvider(
            LOCATIOnManager.NETWORK_PROVIDER,R.String.not_support_network);

    // If both providers return last kNown LOCATIOns,compare the two and use the better
    // one to update the UI.  If only one provider returns a LOCATIOn,use it.
    if (gpsLOCATIOn != null && networkLOCATIOn != null) {
        updateUILOCATIOn(getBetterLOCATIOn(gpsLOCATIOn,networkLOCATIOn));
    } else if (gpsLOCATIOn != null) {
        updateUILOCATIOn(gpsLOCATIOn);
    } else if (networkLOCATIOn != null) {
        updateUILOCATIOn(networkLOCATIOn);
    }
}
...

它实现了最佳位置提供者的想法(通过确定在指定时间段内的准确性,如：

/** Determines whether one LOCATIOn reading is better than the current LOCATIOn fix.
  * Code taken from
  * http://developer.android.com/guide/topics/LOCATIOn/obtaining-user-LOCATIOn.html
  *
  * @param newLOCATIOn  The new LOCATIOn that you want to evaluate
  * @param currentBestLOCATIOn  The current LOCATIOn fix,to which you want to compare the new
  *        one
  * @return The better LOCATIOn object based on recency and accuracy.
  */
protected LOCATIOn getBetterLOCATIOn(LOCATIOn newLOCATIOn,LOCATIOn currentBestLOCATIOn) {
    if (currentBestLOCATIOn == null) {
        // A new LOCATIOn is always better than no LOCATIOn
        return newLOCATIOn;
    }

    // check whether the new LOCATIOn fix is newer or older
    long timedelta = newLOCATIOn.getTime() - currentBestLOCATIOn.getTime();
    @R_874_8487@an isSignificantlyNewer = timedelta > TWO_minutES;
    @R_874_8487@an isSignificantlyOlder = timedelta < -TWO_minutES;
    @R_874_8487@an 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 newLOCATIOn;
    // If the new LOCATIOn is more than two minutes older,it must be worse
    } else if (isSignificantlyOlder) {
        return currentBestLOCATIOn;
    }

    // check whether the new LOCATIOn fix is more or less accurate
    int accuracyDelta = (int) (newLOCATIOn.getAccuracy() - currentBestLOCATIOn.getAccuracy());
    @R_874_8487@an isLessAccurate = accuracyDelta > 0;
    @R_874_8487@an isMoreAccurate = accuracyDelta < 0;
    @R_874_8487@an isSignificantlyLessAccurate = accuracyDelta > 200;

    // check if the old and new LOCATIOn are from the same provider
    @R_874_8487@an isFromSameProvider = isSameProvider(newLOCATIOn.getProvider(),currentBestLOCATIOn.getProvider());

    // Determine LOCATIOn quality using a combination of timeliness and accuracy
    if (isMoreAccuratE) {
        return newLOCATIOn;
    } else if (isNewer && !isLessAccuratE) {
        return newLOCATIOn;
    } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
        return newLOCATIOn;
    }
    return currentBestLOCATIOn;
}

有关完整代码,请查看上面提供的链接.