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Android GPS得到舊位置

2014-01-06 232 views
1

我編碼的GPS跟蹤應用程序，我發現一個propplem：有一段時間它得到我的舊位置，當我拿出電池電池，並重新啓動手機它工作正常。 我不知道爲什麼，你能幫我嗎？Android GPS得到舊位置

來源

2014-01-06 Nguyen Thanh An

+0

示例代碼？使用Google Play服務或位置提供商？ – alex

+0

我正在使用位置提供商 –

+0

您已實施的代碼？ – johntheripp3r

回答

2

有兩種方法，你可以在Android的檢索位置。
1.使用LocationManager
2.使用LocationClient（谷歌播放服務）

  1. 使用LocationManager，你必須提供一個LocationManagerProvider（GPS，網絡，WIFI，被動）。在GPS提供商的情況下，LocationManager將使用硬件GPS來解析當前位置。如果目前沒有GPS，並且您撥打GetLastKnownLocation()。它會返回一個Location對象，來自GPS捕獲位置的最後一個位置（如果有），如果沒有，則返回null。如果您嘗試使用getTime()方法Location您從getLastKnownLocation()獲得的對象，它將在最後一個位置被捕獲時返回給您。 網絡，無線或被動提供商也是如此。

  2. 使用LocationClient從谷歌Play服務的LocationClient會使用自動給你最準確的電流Location *通過調用getLastLocation()ALL THREE（如果可用），GPS，WIFI，3G（網絡）*。再次，這將返回一個Location對象，其餘部分將如上所述。


任何使用這種方法是在你的應用程序更合適的。
注：的LocationManager將要求設備具有一個硬件GPS和LocationClient會要求谷歌播放服務，GPS是不是必須的，但如果設備有一個那麼這將有利於位置更加準確

來源

2014-01-06 06:14:04 johntheripp3r

-1

這是代碼來獲取位置：

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; 
    } 

}

來源

2014-01-06 04:16:17

+0

任何人都可以幫助我嗎？ –

+0

用您的問題發佈您的代碼 – Boopathi

0 
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; 
    }

來源

2014-01-06 04:43:38 Boopathi

0

這裏我給你的代碼，通過GPS顯示當前位置...只需複製並粘貼以下代碼...並在您的Android清單文件中定義2個權限.....可能是這個代碼可以幫助你，請通知我，如果你想任何clearification ....

**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()); 
} 
    } }

GPS Tracker.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>

AndroidManifest。XML

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

來源

2014-01-06 10:39:05

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