0
我有3個片段類的標籤佈局，其中一個我已經實現了一個按鈕來獲取當前位置（緯度&經度）。一切工作正常，除了緯度和經度顯示值爲0爲什麼我得到0經度和緯度？
package com.swipetab.example;
import java.util.Calendar;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
public class FragmentC extends Fragment {
Button Date, Time, GpsBtn;
GPSTracker gps;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.fragment_c, container,
false);
Date = (Button) myFragmentView.findViewById(R.id.button1);
Time = (Button) myFragmentView.findViewById(R.id.button2);
GpsBtn = (Button) myFragmentView.findViewById(R.id.button3);
Date.setOnClickListener(DateOnClickListener);
Time.setOnClickListener(TimeOnClickListener);
GpsBtn.setOnClickListener(GPSOnClickListener);
return myFragmentView;
}
OnClickListener DateOnClickListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
showDatePicker();
}
};
OnClickListener TimeOnClickListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
showTimePicker();
}
};
OnClickListener GPSOnClickListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
showGPSLocation();
}
};
private void showDatePicker() {
DatePicker date = new DatePicker();
/**
* Set Up Current Date Into dialog
*/
Calendar calender = Calendar.getInstance();
Bundle args = new Bundle();
args.putInt("year", calender.get(Calendar.YEAR));
args.putInt("month", calender.get(Calendar.MONTH));
args.putInt("day", calender.get(Calendar.DAY_OF_MONTH));
date.setArguments(args);
/**
* Set Call back to capture selected date
*/
date.setCallBack(ondate);
date.show(getFragmentManager(), "Date Picker");
}
private void showTimePicker() {
Time time = new Time();
/**
* Set Up Current Time Into dialog
*/
Calendar calender = Calendar.getInstance();
Bundle args = new Bundle();
args.putInt("hour", calender.get(Calendar.HOUR_OF_DAY));
args.putInt("min", calender.get(Calendar.MINUTE));
time.setArguments(args);
/**
* Set Call back to capture selected date
*/
time.setCallBack(ontime);
time.show(getFragmentManager(), "Time Picker");
}
private void showGPSLocation() {
gps = new GPSTracker(getActivity());
// check if GPS enabled
if (gps.canGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(
getActivity(),
"Your Location is - \nLat: " + latitude + "\nLong: "
+ longitude, Toast.LENGTH_LONG).show();
} else {
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
OnDateSetListener ondate = new OnDateSetListener() {
@Override
public void onDateSet(android.widget.DatePicker arg0, int year,
int month, int day) {
// TODO Auto-generated method stub
String TabOfFragmentB = ((MainActivity) getActivity())
.getTabFragmentB();
FragmentB fragmentB = (FragmentB) getActivity()
.getSupportFragmentManager().findFragmentByTag(
TabOfFragmentB);
String y = Integer.toString(year);
String m = Integer.toString(month);
String d = Integer.toString(day);
String dat = y.concat("-") + m.concat("-") + d;
fragmentB.b_updateDate(dat);
Toast.makeText(
getActivity(),
String.valueOf(year) + "-" + String.valueOf(month) + "-"
+ String.valueOf(day), Toast.LENGTH_LONG).show();
}
};
OnTimeSetListener ontime = new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker arg0, int hourOfDay, int min) {
// TODO Auto-generated method stub
String TabOfFragmentB = ((MainActivity) getActivity())
.getTabFragmentB();
FragmentB fragmentB = (FragmentB) getActivity()
.getSupportFragmentManager().findFragmentByTag(
TabOfFragmentB);
int hour;
String am_pm;
if (hourOfDay > 12) {
hour = hourOfDay - 12;
am_pm = "PM";
} else {
hour = hourOfDay;
am_pm = "AM";
}
String h = Integer.toString(hour);
String m = Integer.toString(min);
String t = h.concat(":") + m + " " + am_pm;
fragmentB.b_updateTime(t);
Toast.makeText(getActivity(),
String.valueOf(hour) + "-" + String.valueOf(min),
Toast.LENGTH_LONG).show();
}
};
}
GPSTracker類
package com.swipetab.example;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
private Location getLocation() {
// TODO Auto-generated method stub
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
System.out.println("Please Enable!!");
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener Calling this function will stop using GPS in your
* app
* */
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog On pressing Settings button will
* lauch Settings Options
* */
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS settings");
// Setting Dialog Message
alertDialog
.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
}
它的ACCESS_CO（A）RSE_LOCATION而不是ACCESS_COURSE_LOCATION –