【发布时间】：2012-01-09 05:30:19
【问题描述】：
public class LocationtesterActivity extends Activity {
/** Called when the activity is first created. */
LocationManager locManager;
// LocationListener locListener;
Button b;
String provider;
TextView lat, alt, longi;
// Here i am first checking if both GPS and network options are enabled in Lovation and Security Settings or not.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b = (Button) findViewById(R.id.button1);
lat = (TextView) findViewById(R.id.lattitude);
alt = (TextView) findViewById(R.id.altitude);
longi = (TextView) findViewById(R.id.longitude);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showCurrentLocation();
}
});
locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
provider = locManager.getBestProvider(criteria, true);
System.out.println("best provider is :" + provider);
if (!locManager.isProviderEnabled(LocationManager.GPS_PROVIDER)
|| !locManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
System.out.println("in provider enablement");
createGpsDisabledAlert();
}
else {
System.out.println("in location update request");
locManager.requestLocationUpdates(provider, 0, 0,
new MyLocationListener());
}
}
// for displaying the Dialogue Box
// if GPS or network not enabled
// and also taking to location and security screen
private void createGpsDisabledAlert() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(
"Your GPS or network provider is disabled! Would you like to enable it?")
.setCancelable(false)
.setPositiveButton("Enable provider",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
showGpsOptions();
}
});
builder.setNegativeButton("Do nothing",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
private void showGpsOptions() {
Intent gpsOptionsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivityForResult(gpsOptionsIntent, 5);
}
// //////ends/////
// Code to check whether user enabled GPS and Network provider in settings
// if not then show the dialogue box again
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 5 && resultCode == 0) {
if (!locManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
createGpsDisabledAlert();
// Toast.makeText(this,
// "provider not enabled. Click the button for settings",
// 2000).show();
} else {
Intent i=new Intent(this, LocationtesterActivity.class);
startActivity(i);
Toast.makeText(this, "User has enabled the provider", 1000)
.show();
}
}
}
// Method to display the current location
protected void showCurrentLocation() {
Location location = locManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
String message = String.format(
"Current Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
lat.setText("" + location.getLatitude());
longi.setText("" + location.getLongitude());
Toast.makeText(LocationtesterActivity.this, message,
Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(LocationtesterActivity.this, "no last known location", 1000).show();
}
}
// Inner class for LocationListener
private class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
System.out.println("in location changed");
String message = String.format(
"New Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
lat.setText("" + location.getLatitude());
longi.setText("" + location.getLongitude());
// alt.setText("" + location.getAltitude());
Toast.makeText(LocationtesterActivity.this, message,
Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(LocationtesterActivity.this,
"Provider status changed",
Toast.LENGTH_LONG).show();
}
public void onProviderDisabled(String s) {
Toast.makeText(LocationtesterActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(LocationtesterActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}
}
我正在使用上面的代码来查找用户位置。 1.根据我的标准，我总是将 GPS 作为最佳提供商，但这对我来说很好。 2.事情是为什么我无法获得任何位置值？ 即使使用 Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);我没有得到任何东西。 请帮助我获取位置值。
【问题讨论】：
-
如果您正在检查移动设备（设备）位置 location = locManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER) 尝试使用此方法进行初始加载，然后在开启 gps 的情况下获取更新的值！
-
使用网络提供商它可以工作，但使用 GPS 它即使我等待 10 分钟也无法工作。
-
将此更改为 locManager.requestLocationUpdates(provider, 0, 0, new MyLocationListener()); to ........ locManager.requestLocationUpdates(provider, 8000, 2, new MyLocationListener());... 8000(time[millisec] req for update..) 和 2 指定米...
标签： android