如何在Android中獲取當前位置

我遇到了使用Android位置系統的NETWORK提供程序獲取當前位置座標的麻煩。如何在Android中獲取當前位置

已經閱讀了很多教程，並實施了4或5個現有的類到我的項目，他們都給我最後的座標，但不是現有的。

我敢肯定，這個問題是我失蹤的根本原因，但我無法理解它到底是什麼。

代碼我使用的是現在：

這是我的主要活動

package com.example.locationtests; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    GPSTracker mGPS = new GPSTracker(this); 

    TextView text = (TextView) findViewById(R.id.texts); 
    if(mGPS.canGetLocation){ 
    mGPS.getLocation(); 
    text.setText("Lat"+mGPS.getLatitude()+"Lon"+mGPS.getLongitude()); 
    }else{ 
     text.setText("Unabletofind"); 
     System.out.println("Unable"); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

}

這是我使用跟蹤類：

package com.example.locationtests; 

import android.app.AlertDialog; 
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.provider.Settings; 
import android.util.Log; 

public final class GPSTracker implements LocationListener { 

    private final Context mContext; 

    // flag for GPS status 
    public 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 = 1; // 10 meters 

    // The minimum time between updates in milliseconds 
    private static final long MIN_TIME_BW_UPDATES = 1; // 1 minute 

    // Declaring a Location Manager 
    protected LocationManager locationManager; 

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

    /** 
    * Function to get the user's current location 
    * 
    * @return 
    */ 
    public Location getLocation() { 
     try { 
      locationManager = (LocationManager) mContext 
        .getSystemService(Context.LOCATION_SERVICE); 

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

      Log.v("isGPSEnabled", "=" + isGPSEnabled); 

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

      Log.v("isNetworkEnabled", "=" + isNetworkEnabled); 

      if (isGPSEnabled == false && isNetworkEnabled == false) { 
       // no network provider is enabled 
      } else { 
       this.canGetLocation = true; 
       if (isNetworkEnabled) { 
        location=null; 
        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) { 
        location=null; 
        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) { 
    } 

}

這是我的AndroidManifest。 XML

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.locationtests" 
    android:versionCode="1" 
    android:versionName="1.0" > 
    <uses-permission android:name="android.permission.CAMERA" /> 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
    <uses-permission android:name="android.permission.INTERNET"></uses-permission> 
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.VIBRATE" /> 
    <uses-feature android:name="android.hardware.camera" /> 
    <uses-feature android:name="android.hardware.location" android:required="true" /> 
    <uses-feature android:name="android.hardware.location.gps" android:required="false" /> 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="17" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="com.example.locationtests.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest>

Acctualy GPS possitioning工作正常，但網絡定位不到風度。當伊夫開啓裝置GPS上cordinates而IM移動不斷變化，但dosnt happence相同的，當我有把它關掉和繼電器上NETWORK_PROVIDER

來源

2013-07-11 Boris Pawlowski

檢查此http://developer.android。com/training/location/retrieve-current.html – OMAK

簡單的方法是使用像這樣的更高級別的庫：https://github.com/delight-im/Android-SimpleLocation – caw

有一個簡單的lib可以這樣做......很容易實現..看看https://github.com/Gaganjdeep/GetMyLocationLIbrary.git或http://shortcutsandroid.blogspot.in/2016/03/get-current-location-in -activity-in.html –

107

首先運行，你需要定義一個LocationListener處理位置的變化。

private final LocationListener mLocationListener = new LocationListener() { 
    @Override 
    public void onLocationChanged(final Location location) { 
     //your code here 
    } 
};

然後取得LocationManager並要求位置更新

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 

    mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_REFRESH_TIME, 
      LOCATION_REFRESH_DISTANCE, mLocationListener); 
}

最後請確保您所添加的權限的清單，

對於使用基於唯一的網絡位置使用一個

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

對於基於GPS的位置，這一個

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

來源

2013-07-11 10:47:34 Axxiss

Acctualy GPS定位工作正常，但網絡定位dosn't。當Ive開啓設備時，座標系上的GPS在移動時不斷變化，但當我關閉設備時，dosnt發生同樣的變化 –

請注意，GPS和基於NETWORK的位置之間的精度非常高。昨天我在測試中，在公交車上移動時，GPS提供了3-5米的精度和1公里的網絡。所以坐公共汽車/汽車，看看這兩者之間的區別。 – Axxiss

@Axxiss如何獲得LOCATION_REFRESH_TIME， LOCATION_REFRESH_DISTANCE，mLocationListener）; – Amitsharma

你需要編寫代碼在OnLocationChanged方法，因爲這種方法當位置發生變化時調用。即如果調用getLocation，則需要保存新位置以返回它。

如果您不使用onLocationChanged它始終是舊的位置。

來源

2013-07-11 10:38:36

我使用的是this tutorial，它適用於我的應用程序。

在我的活動我把這個代碼：

GPSTracker tracker = new GPSTracker(this); 
    if (!tracker.canGetLocation()) { 
     tracker.showSettingsAlert(); 
    } else { 
     latitude = tracker.getLatitude(); 
     longitude = tracker.getLongitude(); 
    }

也檢查你的仿真器與谷歌API

來源

2013-07-11 10:47:23 fhamicode

+22

什麼是GPSTracker在這裏？ –

+20

翻轉if if plelsse – pomber

翻轉「if」的優點是什麼？ – drulabs

如何在Android中獲取當前位置

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