Question

我正在编写GPS轨道应用程序，我发现了一个问题：有时候它有了我原来的位置，当我从电话中取出电池并重新启动手机时它工作正常。我不知道为什么，你能帮助我吗？

Answer 1

有两种方法可以在Android中检索位置。
1.使用LocationManager
2.使用LocationClient（Google Play服务）

使用LocationManager，您必须提供LocationManager一个Provider（GPS，网络，WIFI，被动）。如果是GPS提供商，LocationManager将使用硬件GPS解析当前位置。如果 GPS不可用，请拨打GetLastKnownLocation()。如果有的话，它会从GPS捕获位置的最后位置返回Location个对象，如果没有，则会返回null。如果您尝试从getTime()获得的Location对象getLastKnownLocation()，则会在捕获到最后一个位置时返回给您。 同样适用于网络，wifi或被动提供商。
使用来自Google Play服务的LocationClient，LocationClient会自动为您提供最准确的当前Location使用* 全部三个（如果有），GPS， WIFI，3G（网络）* 致电getLastLocation()。同样，这将返回一个Location对象，其余部分将如上所述。

使用任何更适合您的应用的方法 注意：LocationManager将要求设备具有硬件GPS并且LocationClient将需要Google播放服务，GPS不是必须的，但如果设备有一个，那么它将有利于该位置更准确

Answer 2

public final LocationListener locationListener = new LocationListener() 
        {
            public void onLocationChanged(Location location) {
                Home.this.location=location;
            }
            public void onProviderDisabled(String provider) {
                Home.this.location=null;
              }
            public void onProviderEnabled(String provider) {
            }
            public void onStatusChanged(String provider, int status, Bundle extras) {
            }
          };

    public String gpsadd() {
        try {


        if(isGPS) {


                    Geocoder gc = new Geocoder(Home.this, Locale.getDefault());
             try 
              {
                addflg=0;
                lat=location.getLatitude();
                lng=location.getLongitude();
                boolean lop=true;
                while(lop) {
                List<Address> addresses = gc.getFromLocation(lat, lng, 1);
                if (addresses.size() > 0) 
                {
                    lop=false;
                    addflg=1;
                    address = addresses.get(0);
                    s_addr=address.getAddressLine(0)+" "+address.getAddressLine(1)+" "+address.getAddressLine(2);
                    disp="Location\n "+address.getAddressLine(0)+"\n"+address.getAddressLine(1)+"\n"+address.getAddressLine(2);

                }

                }


              }
              catch (Exception e)
              {
                  e.printStackTrace();
              }
        } else {
            display("GPS not Enabled");

        }
        } catch(Exception e) {
            e.printStackTrace();

        }

        return disp;
    }

Answer 3

这里我给你的代码通过gps显示当前位置...只需复制并粘贴以下代码...并在你的android清单文件中定义2个权限.....可能这段代码可以帮到你请通知我，如果你想要任何澄清......

**MainActivity.java**


package com.example.android;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

Button btnShowLocation;
GPSTracker gps;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

    // show location button click event
    btnShowLocation.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {        
            // create class object
            gps = new GPSTracker(MainActivity.this);

            // check if GPS enabled     
            if(gps.canGetLocation()){


                  double longitude = gps.getLongitude();
                 double latitude = gps.getLatitude();

                 getAddress(latitude, longitude);



            }    

                else{
                        // can't get location
                        // GPS or Network is not enabled
                    // Ask user to enable GPS/network in settings
                        gps.showSettingsAlert();
                     }

        }
            });
}


 private void getAddress(double latitude, double longitude) {
 StringBuilder result = new StringBuilder();
 try {
    Geocoder geocoder = new Geocoder(this, Locale.getDefault());
    List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
    if (addresses.size() > 0) {
        Address address = addresses.get(0);
        result.append(address.getLocality()).append("\n");
        //result.append(address.getPostalCode());
        result.append(address.getAdminArea()).append("\n");
        result.append(address.getCountryName());
        String address1 = addresses.get(0).getAddressLine(0);
        String city = addresses.get(0).getAddressLine(1);
        String country = addresses.get(0).getAddressLine(2);     
    Toast.makeText(getApplicationContext(), "Your  address is  " + address1 + " ," +   city + "," + country , Toast.LENGTH_LONG).show();


    }
 } catch (IOException e) {
    Log.e("tag", e.getMessage());
}
     }   }

<强> GPSTracker.java

 package com.example.android;
 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();
}

public Location getLocation() {
    try {
        locationManager = (LocationManager) mContext
                .getSystemService(LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } 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 is 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 location) {
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public IBinder onBind(Intent arg0) {
    return null;
}

 }

Activitymain.xml

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <Button android:id="@+id/btnShowLocation" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Show Location"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"/>

 </RelativeLayout>

<强>的AndroidManifest.xml

  <uses-permission android:name="android.permission.INTERNET"  />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Answer 4

这是获取位置的代码：

public class GPSTraker 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 * 5; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTraker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } 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(GPSTraker.this);
        }
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude() {
        if (location != null) {
            latitude = location.getLatitude();
        }
        return latitude;
    }

    public float getspeed() {
        float seeed = 0;
        if (location != null)
            seeed = location.getSpeed();
        return seeed;
    }

    /**
     * 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 is 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 location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

Android GPS获取旧位置

4 个答案: