对于以下情况，在android中获取当前位置的最佳方法是什么，
如果 GPS 不可用，请从网络提供商处获取位置
如果 GPS 可用并且可以获取当前位置，请从 GPS 提供商处获取位置
如果 GPS 可用但无法获取当前位置（即不断搜索位置），请从网络提供商处获取位置。
现在，如果 gps 不可用，我可以从网络获取位置，非常感谢满足上述情况的最佳答案。提前致谢。
问问题
25594 次
3 回答
3
LocationManager manager;
TimerTask mTimertask;
GPSLocationListener mGPSLocationListener;
int i = 0; //Here i works as counter;
private static final int MAX_ATTEMPTS = 250;
public void getCurrentLocation() {
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mGPSLocationListener = new GPSLocationListener();
manager.addGpsStatusListener(mGPSStatusListener);
mTimerTask = new LocTimerTask(LocationManager.GPS_PROVIDER);
if (manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Log.v(TAG, "GPS ENABLED");
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
50.0f, mGPSLocationListener);
} else {
turnGPSOn();
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
50.0f, mGPSLocationListener);
}
if(manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000L,
50.0f, mNetworkLocationListener);
}
if (manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
Log.v(TAG, "GPS ENABLED");
manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
1000L, 50.0f, mGPSLocationListener);
}
myLocTimer = new Timer("LocationRunner", true);
myLocTimer.schedule(mTimerTask, 0, 500);
}
GPS状态监听器
private GpsStatus.Listener mGPSStatusListener = new GpsStatus.Listener() {
@Override
public synchronized void onGpsStatusChanged(int event) {
switch (event) {
case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
Log.v(TAG, "GPS SAtellitestatus");
GpsStatus status = manager.getGpsStatus(null);
mSattelites = 0;
Iterable<GpsSatellite> list = status.getSatellites();
for (GpsSatellite satellite : list) {
if (satellite.usedInFix()) {
mSattelites++;
}
}
break;
case GpsStatus.GPS_EVENT_FIRST_FIX:
/*
* Toast.makeText(getApplicationContext(), "Got First Fix",
* Toast.LENGTH_LONG).show();
*/
break;
case GpsStatus.GPS_EVENT_STARTED:
/*
* Toast.makeText(getApplicationContext(), "GPS Event Started",
* Toast.LENGTH_LONG).show();
*/
break;
case GpsStatus.GPS_EVENT_STOPPED:
/*
* Toast.makeText(getApplicationContext(), "GPS Event Stopped",
* Toast.LENGTH_LONG).show();
*/
break;
default:
break;
}
}
};
位置监听器
public class GPSLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location argLocation) {
location = argLocation;
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
TimerTask 类
class LocTimerTask extends TimerTask {
String provider;
public LocTimerTask(String provider) {
this.provider = provider;
}
final Handler mHandler = new Handler(Looper.getMainLooper());
Runnable r = new Runnable() {
@Override
public void run() {
i++;
Log.v(TAG, "Timer Task run" + i);
location = manager.getLastKnownLocation(provider);
if (location != null) {
Log.v(TAG, "in timer task run in if location not null");
isGPS = true;
onLocationReceived(location);
myLocTimer.cancel();
myLocTimer.purge();
mTimerTask.cancel();
return;
} else {
Log.v(TAG, "in timer task run in else location null");
isGPS = false;
if (location == null && i == MAX_ATTEMPTS) {
Log.v(TAG, "if 1 max attempts done");
turnGPSOff();
location = manager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
Log.v(TAG,
"if 1 max attempts done Location from network not null");
Log.v(TAG,
"if 1 max attempts done Location from network not null coordinates not null");
onLocationReceived(location);
myLocTimer.cancel();
myLocTimer.purge();
mTimerTask.cancel();
return;
}
} else {
return;
}
}
i = 0;
}
};
public void run() {
mHandler.post(r);
}
}
此处的计时器已安排为每 500 毫秒运行一次。意味着，每 500 毫秒计时器任务run method将执行一次。在运行方法中，尝试从 GPS 提供商获取特定编号的位置。尝试次数（此处为 MAX_ATTEMPTS）说 5 或 10。如果它在指定的编号内获得位置。如果计数器（Here i）值超过 MAX_ATTEMPTS，则尝试使用该位置，然后从网络提供商获取位置。在获取位置时，我已将该位置传递给回调方法onLocationReceived(Location mLoc)，您可以在其中进一步处理位置数据。以下是您将如何使用回调方法：
听众
public interface OnLocationReceivedListener {
public void onLocationReceived(Location mLoc); //callback method which will be defined in your class.
}
你的类应该实现上面定义的监听器。在你的课堂上：
@Override
public void onLocationReceived(Location mLoc) {
//Do your stuff
}
希望能帮助到你。如果有人有更好的方法，请告诉我。
于 2013-03-27T07:56:00.047 回答
0
班级成员boolean mIsGpsFix；
请求 Gps 位置更新并设置倒计时
mCountDown.start();
private CountDownTimer mCountDown = new CountDownTimer(time to wait for Gps fix, same as right)
{
@Override
public void onTick(long millisUntilFinished)
{
}
@Override
public void onFinish()
{
// No fix after the desire amount of time collapse
if (!mIsGpsFix)
// Register for Network
}
};
于 2013-03-27T06:44:13.223 回答
0
If GPS is available and can get current location,
对于上述问题，您可以尝试这样..
使用它，您可以获得当前位置的纬度和经度，然后传递值以获取地图。
public class MyLocationListener implements LocationListener
{
@Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = “My current location is: “ +
“Latitud = “ + loc.getLatitude() +
“Longitud = “ + loc.getLongitude();
Toast.makeText( getApplicationContext(),
Text,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(),
“Gps Disabled”,
Toast.LENGTH_SHORT ).show();
}
@Override
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(),
“Gps Enabled”,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
}
于 2013-03-27T06:31:23.847 回答