Android 监听 GPS 状态的变化？答案

【问题标题】：Android Listen For Change in GPS Status?Android 监听 GPS 状态的变化？
【发布时间】：2011-11-16 03:58:18
【问题描述】：

您好，我需要知道如何在 Android 中使用 GPS 来监听以下内容，以便更新PreferenceActivity 中的 UI。我试过GpsStatus.Listener 没有任何反应。

GpsStatus.GPS_EVENT_STARTED
GpsStatus.GPS_EVENT_STOPPED

任何建议都会很棒。

【问题讨论】：

【解决方案1】：

    mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

    // Define a listener that responds to location updates
    mGPSStatusListener = new GpsStatus.Listener() {
        public void onGpsStatusChanged(int event) {
            switch (event) {
            case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                satelliteStatus = mLocationManager.getGpsStatus(null);

                Iterable<GpsSatellite> iSatellites = satelliteStatus
                        .getSatellites();
                Iterator<GpsSatellite> it = iSatellites.iterator();
                maxsatellites = 0;
                while (it.hasNext()) {
                    GpsSatellite oSat = (GpsSatellite) it.next();
                    statArray[maxsatellites][0] = oSat.getPrn();
                    statArray[maxsatellites][1] = oSat.getAzimuth();
                    statArray[maxsatellites][2] = oSat.getPrn();
                    statArray[maxsatellites][3] = oSat.getElevation();
                    statArray[maxsatellites][4] = oSat.getSnr();
                    if (oSat.usedInFix()) {
                        statArray[maxsatellites][5] = 1;
                    } else {
                        statArray[maxsatellites][5] = 0;
                    }
                    maxsatellites++;
                }

                if (mLastLocation != null)
                    if ((SystemClock.elapsedRealtime() - mLastLocationMillis) < 3000) {
                        isGPSFix = 7; // Enumeration for ONC_STAT_3D
                    } else {
                        isGPSFix = 2; // Enumeration for ONC_STAT_BAD_COVER
                    }

                }

                if (isGPSFix == 1) { // A fix has been acquired.
                    // Do something.
                } else { // The fix has been lost.
                    // Do something.
                }

                break;
            case GpsStatus.GPS_EVENT_FIRST_FIX:
                // Do something.
                isGPSFix = 1;
                break;
            case GpsStatus.GPS_EVENT_STOPPED:
                if ((mLastLocation = mLocationManager
                        .getLastKnownLocation(LocationManager.GPS_PROVIDER)) != null) {
                    isGPSFix = 5; // Enumeration for                    } else {
                    isGPSFix = 2; // Enumeration for 
                }

            }
        }

    };

    mGPSLocationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            // Called when a new location is found by the location
            // provider.
            if (location == null)
                return;

            mLastLocationMillis = SystemClock.elapsedRealtime();

            // Do something.

            mLastLocation = location;
                        }
        }

        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub

        }

        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub

        }

        public void onStatusChanged(String provider, int status,
                Bundle extras) {
            // TODO Auto-generated method stub

        }
    };

    mLocationManager.addGpsStatusListener(mGPSStatusListener);


    // Register the listener with the Location Manager to receive location
    // updates
    mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            mUpdateIntervalInMillis, 0, mGPSLocationListener);

【讨论】：

在做mLocationManager.addGpsStatusListener(mGPSStatusListener);时应该在onCreate或onResume中完成还是两者都可以完成？

【解决方案2】：

查看了系统设置应用程序的源代码，以及他们是如何做到的，并将其实现到我的应用程序中，效果很好。 @SKJ thx 的帮助，但遗憾的是我无法让 GpsStatus.Listener 工作，源代码完美运行。

【讨论】：