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onReceive()中的LocationManager不会定位,除非我调用监听器两次,但第一次调用定位,第二次调用不使用新位置

locationmanager location gps android

Diamond Dave · 技术社区 · 12 年前

我承认我对android比较陌生,我来自python和C++。我们将不胜感激。我只是在receive上从广播接收器调用位置更新,这样我就可以给我的设备发短信,并接收它的位置,在那一刻更新。

我发现我可以通过发送短信呼叫位置,但它不会更新位置,只会给出最后一个已知的位置。如果我两次调用requestLocationUpdates,它似乎是用设备上的GPS图标定位的,但第二次调用requestLocation Updates时没有使用更新的位置,而是使用旧位置。如果我不调用requestLocationUpdates两次,它甚至不会更新(而且没有GPS图标闪烁来证实这一点。) 这是我的代码,其中第一个对requestLocationUpdates的多余调用被注释掉了。
我知道代码不漂亮(比如Thread.sleep的,我打算在更新开始后删除它。请原谅那些临时的部分。有人能帮帮我吗?从逻辑上讲,代码应该做我想做的事情,但逻辑不适用于这个。:


   package com.JT.appNew01;
import java.util.ArrayList;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.telephony.SmsManager;
import android.telephony.gsm.SmsMessage;
import android.widget.Toast;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
public class SmsReceiverXxx extends BroadcastReceiver{
    public static final String COMMAND = "SENDER";
    public static final int SENDER_ACT_DOCUMENT = 0;
    public static final int SENDER_SRV_POSITIONING = 1;
    public static final int MIN_TIME_REQUEST = 5 * 1000;
    public static final String ACTION_REFRESH_SCHEDULE_ALARM =
            "com.JT.appNew01.ACTION_REFRESH_SCHEDULE_ALARM";
    private static Location currentLocation;//was private static
    private static Location prevLocation;//was private static
    private static Context _context;
    private String provider = LocationManager.GPS_PROVIDER;
    private static Intent _intent;
    private static LocationManager locationManager;//was private static
    //I ADDED FOR FIRST PASS THE FOLLOWING:
    private LocationListener locList=new LocationListener(){
        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
            try {
                gotLocation(location);
            } catch (Exception e) {
            }
        }
        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub
        }
        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub
        }
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub
            try {
                String strStatus = "";
                switch (status) {
                case GpsStatus.GPS_EVENT_FIRST_FIX:
                    strStatus = "GPS_EVENT_FIRST_FIX";
                    break;
                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                    strStatus = "GPS_EVENT_SATELLITE_STATUS";
                    break;
                case GpsStatus.GPS_EVENT_STARTED:
                    strStatus = "GPS_EVENT_STARTED";
                    break;
                case GpsStatus.GPS_EVENT_STOPPED:
                    strStatus = "GPS_EVENT_STOPPED";
                    break;
                default:
                    strStatus = String.valueOf(status);
                    break;
                }
            } catch (Exception e) {
                                e.printStackTrace();
            }
        }
        };// I ADDED THIS TO GO WITH FIRST PASS!!!!!
    private static LocationListener locationListener = new LocationListener(){//was private static
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            try {
                String strStatus = "";
                switch (status) {
                case GpsStatus.GPS_EVENT_FIRST_FIX:
                    strStatus = "GPS_EVENT_FIRST_FIX";
                    break;
                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                    strStatus = "GPS_EVENT_SATELLITE_STATUS";
                    break;
                case GpsStatus.GPS_EVENT_STARTED:
                    strStatus = "GPS_EVENT_STARTED";
                    break;
                case GpsStatus.GPS_EVENT_STOPPED:
                    strStatus = "GPS_EVENT_STOPPED";
                    break;
                default:
                    strStatus = String.valueOf(status);
                    break;
                }
            } catch (Exception e) {
                                e.printStackTrace();
            }
        }
        @Override
        public void onProviderEnabled(String provider) {
        }
        @Override
        public void onProviderDisabled(String provider) {
        }
        @Override
        public void onLocationChanged(Location location) {
            try {
                gotLocation(location);
            } catch (Exception e) {
            }
        }
    };
        @Override
        public void onReceive(final Context context, Intent intent) 
        {
            SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
            String valuephn=sharedPrefs.getString("welcome_message", "NULL");
            int zz = 0;
            int MAX_SMS_MESSAGE_LENGTH = 160; 
            Bundle bundle = intent.getExtras();        
            SmsMessage[] msgs = null;
            String str = "";    
            Object[] pdus = (Object[]) bundle.get("pdus"); 
            msgs = new SmsMessage[pdus.length];
            if (bundle != null)
            {
              try {
                for (int i=0; i<msgs.length; i++){
                    msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);                
                    str += "Map Trax - Location: " + msgs[i].getOriginatingAddress();                     
                    str += " :";
                    str += msgs[i].getMessageBody().toString();
                    str += "\n";   
                    zz=i;
                }
                   } catch (Exception e){
                         e=e;
                     }
                SmsManager sms = SmsManager.getDefault();
                PendingIntent pendingIntent = null;
                //String xyzx = msgs[zz].getOriginatingAddress();
                String xyzx="a";             // TEMPORARY FOR SKYPE!!! USE LINE ABOVE!!!
                // FIRST PASS TRY TO GET COORDS:
                //try{
                //  //if ( xyzx.contains(valuephn) ) {
                //  if ( xyzx.contains("a") ) {                // TEMPORARY FOR SKYPE!!! USE LINE ABOVE!!!
                //      _context = context;
                //      _intent = intent;
                //      locationManager = (LocationManager) context
                //              .getSystemService(Context.LOCATION_SERVICE);
                //      if (locationManager.isProviderEnabled(provider)) {
                //          locationManager.requestLocationUpdates(provider, MIN_TIME_REQUEST,
                //                  5, locList);            
                //         
                //          Location gotLoc = locationManager.getLastKnownLocation(provider);
                //          gotLocation(gotLoc);
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          OnNewLocationReceived(gotLoc);//JUST ADDED!!!
                //          stopLocationListener();//JUST ADDED!!!
                //         
                //
                //      } else {
                //          Location gotLoc2 = locationManager.getLastKnownLocation(provider);
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          pauseOne();
                //          pauseTwo();
                //          pauseThree();
                //          pauseFour();
                //          pauseFive();
                //          OnNewLocationReceived(gotLoc2);//JUST ADDED!!!
                //          stopLocationListener();//JUST ADDED!!!
                //      }
                //  }}catch(Exception zzz){}
                // END FIRST PASS.
                try{
                //if ( xyzx.contains(valuephn) ) {
                if ( xyzx.contains("a") ) {                // TEMPORARY FOR SKYPE!!! USE LINE ABOVE!!!
                    _context = context;
                    _intent = intent;
                    locationManager = (LocationManager) context
                            .getSystemService(Context.LOCATION_SERVICE);
                    if (locationManager.isProviderEnabled(provider)) {
                        locationManager.requestLocationUpdates(provider, MIN_TIME_REQUEST,
                                5, locationListener);           

                        Location gotLoc = locationManager.getLastKnownLocation(provider);
                        gotLocation(gotLoc);
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        OnNewLocationReceived(gotLoc);//JUST ADDED!!!
                        stopLocationListener();//JUST ADDED!!!
                    } else {
                        Location gotLoc2 = locationManager.getLastKnownLocation(provider);
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        pauseOne();
                        pauseTwo();
                        pauseThree();
                        pauseFour();
                        pauseFive();
                        OnNewLocationReceived(gotLoc2);//JUST ADDED!!!
                        stopLocationListener();//JUST ADDED!!!
                    }
                //sms.sendTextMessage(valuephn,"", "Map Trax - GPS Co-ordinates:"+locationStringFromLocation(null).toString()+" - Map: http://maps.google.com/?q="+locationStringFromLocation(null).toString(),pendingIntent,pendingIntent);
                    Toast.makeText(context, "1: "+locationStringFromLocation(null).toString(), Toast.LENGTH_SHORT).show();
                    locationManager.removeUpdates(locationListener);
                }
                }catch(Exception zzz){
                    try{
                        if ( xyzx.contains("a") ) {
                            //sms.sendTextMessage(valuephn,"", "Map Trax - GPS Co-ordinates:"+locationStringFromLocation2(null).toString()+" - Map: http://maps.google.com/?q="+locationStringFromLocation2(null).toString(),pendingIntent,pendingIntent);
                            Toast.makeText(context, "2: "+locationStringFromLocation2(null).toString(), Toast.LENGTH_SHORT).show();
        locationManager.removeUpdates(locationListener);
                           }
                    }catch(Exception zzzz){
                        //sms.sendTextMessage(valuephn,"","Location currently unavailable",pendingIntent,pendingIntent);
                        Toast.makeText(context, "Location currently unavailable", Toast.LENGTH_SHORT).show();
                        locationManager.removeUpdates(locationListener);
                    }
                }
                };
        }
        private void pauseFive() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        private void pauseFour() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        private void pauseThree() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        private void pauseTwo() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        private void pauseOne() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        public static String locationStringFromLocation(final Location location) {//was public static
            return String.format("%.3f,%.3f", currentLocation.getLatitude(), currentLocation.getLongitude());
        }
        public static String locationStringFromLocation2(final Location location) {//was public static
            return String.format("%.3f,%.3f", prevLocation.getLatitude(), prevLocation.getLongitude());
        }
        private static void gotLocation(Location location) {//was public static
            prevLocation = currentLocation == null ?
                    null : new Location(currentLocation);
            currentLocation = location;
            if (isLocationNew()) {
                OnNewLocationReceived(location);
                //Toast.makeText(_context, "new location saved", Toast.LENGTH_SHORT)
                //        .show();
                stopLocationListener();
            }
        }
        private static boolean isLocationNew() {//was public static
            if (currentLocation == null) {
                return false;
            } else if (prevLocation == null) {
                return true;
            } else if (currentLocation.getTime() == prevLocation.getTime()) {
                return false;
            } else {
                return true;
            }
        }
        public static void stopLocationListener() {//was public static
            locationManager.removeUpdates(locationListener);
        }
        static ArrayList<OnNewLocationListener> arrOnNewLocationListener =
                new ArrayList<OnNewLocationListener>();
        public static void setOnNewLocationListener(
                OnNewLocationListener listener) {
            arrOnNewLocationListener.add(listener);
        }
        public static void clearOnNewLocationListener(
                OnNewLocationListener listener) {
            arrOnNewLocationListener.remove(listener);
        }
        // This function is called after the new point received
        private static void OnNewLocationReceived(Location location) {
            // Check if the Listener was set, otherwise we'll get an Exception when
            // we try to call it
            if (arrOnNewLocationListener != null) {
                // Only trigger the event, when we have any listener
                for (int i = arrOnNewLocationListener.size() - 1; i >= 0; i--) {
                    arrOnNewLocationListener.get(i).onNewLocationReceived(
                            location);
                }
            }
        }
}

1 回复 | 直到 12 年前

Hoan Nguyen 12 年前

您必须编写一个服务来更新位置,并在您的广播接收器接收到Sms时启动该服务。

BroadcastReceiver文档

接收器生命周期

BroadcastReceiver对象仅在调用onReceive(Context,Intent)的持续时间内有效。一旦您的代码从此函数返回,系统就会认为该对象已完成,不再处于活动状态。

这对onReceive(Context,Intent)实现中的操作有重要影响:任何需要异步操作的操作都不可用,因为您需要从函数返回来处理异步操作,但此时BroadcastReceiver不再活动,因此系统可以在异步操作完成之前自由终止其进程。

特别是,您可能不会在BroadcastReceiver中显示对话框或绑定到服务。对于前者,您应该使用NotificationManager API。对于后者,可以使用Context.startService()向服务发送命令。