發現有很多android 手機獲取地理位置，很多時候都不一定能夠獲取到，並且不一定準確，因為那個位置都是上次獲取的時候拿到的，得更新。具體實現程式碼如下

import android.app.Activity;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import
 
 android.location.LocationProvider;
import android.os.Bundle;
import android.widget.TextView;

import java.util.Iterator;
import java.util.List;

public class LocationBase extends Activity {
    private TextView myText;
    private String textStr = "";
    private LocationManager mgr = null;

    protected
 
 void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addText("Location Based-Services Demo...");

        //步驟 1: 獲取系統的定位管理器
        mgr = (LocationManager) getSystemService(LOCATION_SERVICE);
        addText("get system Location Manager " + mgr);
    }

    //步驟2.2 持續跟蹤中的停止update：在本例中，我們要求不斷獲得位置更新，我們必須在人工進行removeUpdates()，否則即使應用中所有的Activity都關閉，App仍繼續在不斷更新位置資訊，導致應用資源無法被回收
 

    protected void onPause() {
        super.onPause();
        PackageManager pm = getPackageManager();
        boolean permissionFine = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.ACCESS_FINE_LOCATION", getPackageName()));
        boolean permissionCoarse = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.ACCESS_COARSE_LOCATION", getPackageName()));
        if (permissionFine == true && permissionCoarse == true) {
            mgr.removeUpdates(onLocationChange);
        }
        addText("Remove Updates...");
    }

    //步驟2：設定持續跟蹤
    //步驟 2.1（1） ：我們在onResume()中持續跟蹤，相應的在onPause()中關閉出現跟蹤。我們只在Activity執行時進行跟蹤。具體見Activity的生命週期
    protected void onResume() {
        super.onResume();


        mgr.addTestProvider(LocationManager.NETWORK_PROVIDER,

                "requiresNetwork" == "", "requiresSatellite" == "", "requiresCell" == "", "hasMonetaryCost" == "",
                "supportsAltitude" == "", "supportsSpeed" == "",
                "supportsBearing" == "", android.location.Criteria.POWER_LOW,
                android.location.Criteria.ACCURACY_FINE);
        mgr.setTestProviderEnabled(LocationManager.NETWORK_PROVIDER, true);

        PackageManager pm = getPackageManager();
        boolean permissionFine = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.ACCESS_FINE_LOCATION", getPackageName()));
        boolean permissionCoarse = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.ACCESS_COARSE_LOCATION", getPackageName()));

        addText("Request Updates automatically ...");

        List<String> list = mgr.getAllProviders(); //mgr即LocationManager
        for (Iterator<String> i = list.iterator(); i.hasNext(); ) {
            System.out.println("\t" + i.next());
        }

        Criteria criteria = new Criteria();
        String providerName = mgr.getBestProvider(criteria, true /*enabledOnly*/); //criteria不能填null，否則出現異常
        LocationProvider provider = mgr.getProvider(providerName);
        location = mgr.getLastKnownLocation(providerName);
        if (permissionFine == true && permissionCoarse == true) {
//步驟2.1 （2）：由於人的位置是不斷變化，我要設定一個位置變化的範圍，包括同時滿足最小的時間間隔和最小的位移變化，如果兩個條件要同時滿足，將位置監聽器將被觸發。實際上該方法有多個引數格式，特別是requestLocationUpdates (long minTime, float minDistance, Criteria criteria,PendingIntent intent)，當位置變化時可呼叫其他的Activity。 在本例中，我們制定用GPS，則在許可權中必須要求精確定位許可。
           while(location == null) {
            mgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 100/*10秒，為測試方便*/, 0.1f/*1公里*/, onLocationChange/*位置監聽器*/);
           }
        }

        if (location != null)
            System.out.println("Get Location from " + providerName + " : " + location.getLatitude() + "," + location.getLongitude());
    }

    Location location;

    //步驟3：位置監聽器LocationListener 的設定，當位置發生變化是觸發onLocationChanged( )
    LocationListener onLocationChange = new LocationListener() {
        public void onLocationChanged(Location location2) {
            location = location2;
            addText("Location Changed : (" + location.getLongitude() + "," + location.getLatitude() + ")");
        }

        public void onProviderDisabled(String arg0) {
            addText("onProviderDisabled");
        }

        public void onProviderEnabled(String arg0) {
            addText("onProviderEnabled");
        }

        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
            addText("onStatusChanged");
        }
    };

    private void addText(String s) {
        textStr = textStr.concat(s + "\n\n");
        myText.setText(textStr);
    }
}