Question

我正在寻找GPS坐标。我的标准是：

不等于最后一个位置
准确度＆lt; 500

一般而言，系统应接受<200m aprox的GPS坐标。

我在我的应用中尝试了4次尝试：

首先尝试：

19.3820126,-99.1647096:Acc:50.528 Last location ( That's why we keep searching - error 3 km)
01-29 10:37:42.698  onLocationChanged﹕ 19.364292,-99.1776019:Acc:660.0 (error: Aprox 60 m - should accept it)
01-29 10:37:47.733  onLocationChanged﹕ 19.3639126,-99.1771124:Acc:660.0 (error: Aprox 80 m - should accept it)
01-29 10:37:52.788  onLocationChanged﹕ 19.3639126,-99.1771124:Acc:660.0 (error: Aprox 80 m - should accept it)
01-29 10:37:57.853  onLocationChanged﹕ 19.3820112,-99.1646983:Acc:50.531 (Last location - error 3km)... System get the wrong coord.

第二次尝试：

01-29 10:42:05.885  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (error: Aprox 100 m - should accept it)
01-29 10:42:10.980  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (error: Aprox 100 m - should accept it)
01-29 10:42:15.985  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (error: Aprox 100 m - should accept it)
01-29 10:42:21.020  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (error: Aprox 100 m - should accept it)
01-29 10:42:26.085  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (error: Aprox 100 m - How can onLocationChanged can be called if location is not changing)

第三次尝试：

01-29 10:47:20.002  onLocationChanged﹕ 19.3652615,-99.1782989:Acc:784.0 (Last location - error: Aprox 100 m)
01-29 10:47:25.037  onLocationChanged﹕ 19.3820153,-99.1646946:Acc:50.532 (Last location - error 3km)... System get the wrong coord.

第四次尝试：

01-29 11:00:25.518  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 (error: Aprox 100 m - should accept it)
01-29 11:00:34.016  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 (error: Aprox 100 m - should accept it)
01-29 11:00:38.451  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 (error: Aprox 100 m - should accept it)
01-29 11:00:43.455  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 (error: Aprox 100 m - should accept it)
01-29 11:00:48.530  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 (error: Aprox 100 m - should accept it)
01-29 11:00:53.585  onLocationChanged﹕ 19.3651962,-99.1780395:Acc:639.0 Time's up, app doesn't accept the coord ( criteria is Acc < 500), but I could accept it.

这四次尝试让我问了很多：

准确性是值得信赖的因素。我知道精度越小，效果越好。不过，我在这里发现相信准确性会给我带来错误的结果。
在第一次和第三次尝试中，为什么加入的坐标是另一个坐标（我的家，我在工作）
在第二次尝试中，为什么在坐标是相同的情况下调用onLocationChanged

我的代码很标准：

public class LocationUtils implements
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener, LocationListener {
private static final long ONE_MIN = 1000 * 60;
private Context ctx;
// Debugging tag for the application
public static final String APPTAG = "LocationSample";

public static final int MILLISECONDS_PER_SECOND = 1000;

// The update interval
public static final int UPDATE_INTERVAL_IN_SECONDS = 5;

// A fast interval ceiling
public static final int FAST_CEILING_IN_SECONDS = 1;

// Update interval in milliseconds
public static final long UPDATE_INTERVAL_IN_MILLISECONDS =
        MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;

// A fast ceiling of update intervals, used when the app is visible
public static final long FAST_INTERVAL_CEILING_IN_MILLISECONDS =
        MILLISECONDS_PER_SECOND * FAST_CEILING_IN_SECONDS;
public static final long FASTEST_INTERVAL_CEILING_IN_MILLISECONDS = 100; // 16ms = 60fps

// Create an empty string for initializing strings
public static final String EMPTY_STRING = new String();
public static GoogleApiClient mGoogleApiClient;
public static LocationRequest mLocationRequest;
private int mAction;



public LocationUtils(Context context) {
    ctx = context;
}


public static void disconnectGPS(LocationListener list) {
    if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
        stopPeriodicUpdates(mGoogleApiClient, list);
        mGoogleApiClient.disconnect();
    }
}

public static void startPeriodicUpdates(GoogleApiClient mGoogleApiClient, LocationRequest mLocationRequest, LocationListener listener) {
    LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, listener);

}

public static void stopPeriodicUpdates(GoogleApiClient mGoogleApiClient, LocationListener listener) {
    LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, listener);
}

public void init_location(Context ctx) {
    mGoogleApiClient = new GoogleApiClient.Builder(ctx)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    mLocationRequest = LocationRequest.create();

    /*
     * Set the update interval
     */
    mLocationRequest
            .setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);

    // Use high accuracy
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    // Set the interval ceiling to one minute
    mLocationRequest
            .setFastestInterval(FAST_INTERVAL_CEILING_IN_MILLISECONDS);
    mLocationRequest
            .setFastestInterval(FASTEST_INTERVAL_CEILING_IN_MILLISECONDS);
}


public static boolean servicesAvailable(Context ctx) {
    int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(ctx);

    if (ConnectionResult.SUCCESS == resultCode) {
        return true;
    } else {
        GooglePlayServicesUtil.getErrorDialog(resultCode, (Activity) ctx, 0).show();
        return false;
    }
}

@Override
public void onConnected(Bundle bundle) {
        startPeriodicUpdates(mGoogleApiClient,mLocationRequest, this);
}

@Override
public void onConnectionSuspended(int i) {

}

@Override
public void onLocationChanged(Location location) {
    Log.e("onLocationChanged",location.getLatitude()+","+location.getLongitude()+":Acc:"+location.getAccuracy() );
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {

}

public void connect(int action) {
    mAction = action;
    if (!mGoogleApiClient.isConnected()) {
        mGoogleApiClient.connect();
        }


    }
}

我正在使用多种设备进行测试，三星s4，s3 mini，核心2。我总是打开GPS，没有wifi，但3G已激活。

编辑：我在室内进行测试，因此GPS结果不应该很好，但我希望Fused Location能够适应我的情况，因为我无法再选择提供商。

Answer 1

您的位置在半径范围内的准确率仅为68％，因此仍有很大可能不正确。

没有WiFi你的意思是你没有连接到任何网络或WiFi被禁用？

例如，如果您在一个地方安装了WiFi路由器，然后移动到一个新的地方并随身携带WiFi路由器，Google仍会在相当长一段时间内返回旧位置。

关于你的上一个问题，你要求每5秒更新一次位置，这样即使位置相同，你也会得到指定时间段的回调。

Answer 2

重复的问题？ How accurate is Android GPS?

但是，如果您希望确定某些位置，取决于您要完成的任何操作，请查看地理围栏。

http://appcrawlr.com/android-apps/best-apps-geo-fencing

任何人都可以向我解释GPS跟踪如何在Android中运行

2 个答案: