BlackBerry刷新位置通过GPS或Cell Tower

Question

BlackBerry刷新位置通过GPS或Cell Tower

Sar*_*rah 4 gps location blackberry gps-time java-me

我试图通过单击按钮刷新当前位置.可以通过GPS或Cell Tower获取该位置,无论哪个可用.我的问题是我从未见过"载入画面".我知道当坐标保持为零时,它会立即显示/关闭.有人可以帮助我 - 我下面做错了什么？

既不更新位置也不显示加载屏幕.没有加载屏幕和多次点击"刷新按钮",我确实得到了位置.以下是处理"刷新按钮"点击的代码:

FieldChangeListener refreshImgListener = new FieldChangeListener() {   
    public void fieldChanged(Field field, int context) 
    {
        Thread backgroundWorker = new Thread(new Runnable() {
            public void run() {
                refreshCoordinates();
            }
        });
        busyDialog.setEscapeEnabled(false);  
        busyDialog.show();
        backgroundWorker.start();
    }
};

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我的refreshCoordinates()方法如下:

public void refreshCoordinates() {
    do
    {
        getLatitude(handleeGPS.latitude);
        getLongitude(handleeGPS.longitude);
    } while ((longi == "0.0" || lati == "0.0") || (longi.length() == 0 || lati.length()==0));

    UiApplication.getUiApplication().invokeLater( new Runnable()
    {
        public void run ()
        {
            lblLatitude.setText(lati);
            lblLongitude.setText(longi);
            busyDialog.cancel();
        }
    } );
}

public static String getLatitude(double value) 
{
    lati= Double.toString(value);
    return lati;
}
public static String getLongitude(double value) 
{
    longi= Double.toString(value);
    return longi;
}

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返回纬度和经度值的类:

public class handleeGPS{

    static GPSThread gpsThread;
    public static double latitude;
    public static double longitude;

    public handleeGPS(){
        gpsThread = new GPSThread();
        gpsThread.start();
    }

    private static class GPSThread extends Thread{
        public void run() {
            Criteria myCriteria = new Criteria();
            myCriteria.setCostAllowed(false);
            int m_bbHandle = CodeModuleManager.getModuleHandle("net_rim_bb_lbs");
            if(m_bbHandle>0){
                try {
                    int cellID = GPRSInfo.getCellInfo().getCellId();
                    int lac = GPRSInfo.getCellInfo().getLAC();
                    String urlString2 = "http://www.google.com/glm/mmap";
                    // Open a connection to Google Maps API
                    ConnectionFactory connFact = new ConnectionFactory();
                    ConnectionDescriptor connDesc;
                    connDesc = connFact.getConnection(urlString2);
                    HttpConnection httpConn2;
                    httpConn2 = (HttpConnection)connDesc.getConnection();
                    httpConn2.setRequestMethod("POST");
                    // Write some custom data to Google Maps API
                    OutputStream outputStream2 = httpConn2.openOutputStream();//getOutputStream();
                    WriteDataGoogleMaps(outputStream2, cellID, lac);
                    // Get the response
                    InputStream inputStream2 = httpConn2.openInputStream();//getInputStream();
                    DataInputStream dataInputStream2 = new DataInputStream(inputStream2);
                    // Interpret the response obtained
                    dataInputStream2.readShort();
                    dataInputStream2.readByte();
                    int code = dataInputStream2.readInt();
                    //Dialog.alert(code+"");
                    if (code == 0) {
                        latitude= dataInputStream2.readInt() / 1000000D;
                        longitude=dataInputStream2.readInt() / 1000000D;
                        //Dialog.alert(latitude+"-----"+longitude);
                        dataInputStream2.readInt();
                        dataInputStream2.readInt();
                        dataInputStream2.readUTF();
                    } else {
                        System.out.println("Error obtaining Cell Id ");
                    }
                    outputStream2.close();
                    inputStream2.close();
                } catch (Exception e) {
                    System.out.println("Error: " + e.getMessage());
                }
            } else {
                try {
                    LocationProvider myLocationProvider = LocationProvider.getInstance(myCriteria);
                    try {
                        Location myLocation = myLocationProvider.getLocation(300);
                        latitude  = myLocation.getQualifiedCoordinates().getLatitude();
                        longitude = myLocation.getQualifiedCoordinates().getLongitude();
                        if(latitude==0.0 && longitude==0.0){
                            try {
                                int cellID = GPRSInfo.getCellInfo().getCellId();
                                int lac = GPRSInfo.getCellInfo().getLAC();
                                String urlString2 = "http://www.google.com/glm/mmap";
                                // Open a connection to Google Maps API
                                ConnectionFactory connFact = new ConnectionFactory();
                                ConnectionDescriptor connDesc;
                                connDesc = connFact.getConnection(urlString2);
                                HttpConnection httpConn2;
                                httpConn2 = (HttpConnection)connDesc.getConnection();
                                httpConn2.setRequestMethod("POST");
                                // Write some custom data to Google Maps API
                                OutputStream outputStream2 = httpConn2.openOutputStream();
                                //getOutputStream();
                                WriteDataGoogleMaps(outputStream2, cellID, lac);
                                // Get the response
                                InputStream inputStream2 = httpConn2.openInputStream();
                                //getInputStream();
                                DataInputStream dataInputStream2 = new DataInputStream(inputStream2);
                                // Interpret the response obtained
                                dataInputStream2.readShort();
                                dataInputStream2.readByte();
                                int code = dataInputStream2.readInt();
                                //Dialog.alert(code+"");
                                if (code == 0) {
                                    latitude= dataInputStream2.readInt() / 1000000D;
                                    longitude=dataInputStream2.readInt() / 1000000D;
                                    //Dialog.alert(latitude+"-----"+longitude);
                                    dataInputStream2.readInt();
                                    dataInputStream2.readInt();
                                    dataInputStream2.readUTF();
                                } else {
                                    System.out.println("Error obtaining Cell Id ");
                                }
                                outputStream2.close();
                                inputStream2.close();
                            } catch (Exception e) {
                                System.out.println("Error: " + e.getMessage());
                            }
                        }
                    }
                    catch ( InterruptedException iex ) {
                        return;
                    }
                    catch ( LocationException lex ) {
                        return;
                    }
                } catch ( LocationException lex ) {
                    return;
                }
            }
            return;
        }
    }

    private static void WriteDataGoogleMaps(OutputStream out, int cellID, int lac)
    throws IOException {
        DataOutputStream dataOutputStream = new DataOutputStream(out);
        dataOutputStream.writeShort(21);
        dataOutputStream.writeLong(0);
        dataOutputStream.writeUTF("en");
        dataOutputStream.writeUTF("Android");
        dataOutputStream.writeUTF("1.0");
        dataOutputStream.writeUTF("Web");
        dataOutputStream.writeByte(27);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(3);
        dataOutputStream.writeUTF("");
        dataOutputStream.writeInt(cellID);
        dataOutputStream.writeInt(lac);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.flush();
    }
}

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Answer 1

Nat*_*ate 5

好的,所以虽然我的原始答案是有效的,但是你发布的新代码有一些不同的问题,所以我发布了第二个答案.有足够的事情看起来不对,我只是改写了你的handleeGPS课程.我将逐一解释我所做的重大改变:

尝试使用Java命名约定.这使我们更容易为您提供帮助.在将代码发布到handleeGPS类之前,我认为它是一个变量,因为小写名称通常用于变量,而不是类.
避免重复代码.该handleeGPS课程有很多代码可以阅读,但大部分是从Google的Web服务获取位置的代码,您可以在两个地方复制这些代码.只需创建一个只包含该代码的方法,然后调用它两次.
我把你的handleeGPS课程改名为GPSHandler.我不确定是否handlee是错误,或者是否是您使用的其他语言的单词.无论如何,名称至少应以大写字母开头.
避免使用大量static变量和方法.有时,确实应该只有一个东西.GPS处理类可能就是一个很好的例子,因为该设备只有一个GPS系统.但是,要强制执行此代码构造,请不要将所有内容标记为static.只需将类设为Singleton,即只创建一个static成员变量(_instance)和一个静态方法(getInstance()).在我的代码中,您将访问这样的类:GPSHandler gps = GPSHandler.getInstance();.
我相信你对是否安装了BB地图的检查实际上是倒退了.您查找了net_rim_bb_lbs模块,如果它大于零(这意味着安装了BB地图),那么您就直接进入了Google Web服务.我认为你想要反过来(如果安装了BB地图,请尝试设备GPS).此外,从6.0开始,您也需要检查net_rim_bb_maps.
在您发布更新之前,我认为您getLatitude()和getLongitude()方法实际上是获取设备位置.这对我来说是一个糟糕的假设.他们只是将数字转换为字符串.因此,没有理由在后台完成(使用a Thread).你已经编写了你的handleeGPS类来使用后台线程,这很好.一个后台线程就足够了.使用位置信息的UI不应该还需要背景Thread.我更改了代码以添加GPSListener接口.该接口应由您的UI代码实现,以接收位置更新.没有理由继续循环,询问位置是否不等于{0.0,0.0}.那效率很低.使用我的代码,您将在位置确实发生变化时收到通知.
原始代码不是线程安全的.在handleeGPS latitude和longitude变量设定在后台线程,并在UI线程上访问.那不安全.两个线程不应该同时读取和写入同一条数据.通过更改代码以将位置数据推送到GPSListener,可以避免此问题.
我注释掉的Dialog.alert(),你有你的内部代码handleeGPS的类,它不会为你工作,因为你不能使从背景UI调用.我把这些电话包围起来,UiApplication.getUiApplication().invokeLater()以使它们安全.

要在您的UI代码中使用此类,您可以执行此操作,而不是使用a Thread来运行您的refreshCoordinates()方法:

public void fieldChanged(Field field, int context) 
    // this is called when your location refresh button is clicked
    GPSHandler.getInstance().setListener(this); 
    GPSHandler.getInstance().requestLocationUpdates();
    busyDialog.setEscapeEnabled(false);  
    busyDialog.show();
}

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...

public void onLocationReceived(Coordinates location) {
    lblLatitude.setText(Double.toString(location.getLatitude()));               
    lblLongitude.setText(Double.toString(location.getLongitude()));               
    busyDialog.cancel();               
}

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确保您放置该代码的类(上面)implements GPSListener,这是一个接口,在这里定义:

public interface GPSListener {
    public void onLocationReceived(Coordinates location);
}

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最后,GPSHandler:

public class GPSHandler { 

   private GPSThread _gpsThread;
   private Coordinates _location;
   private boolean _gotLocation;
   private GPSListener _listener;

   /** this class will be a Singleton, as the device only has one GPS system */
   private static GPSHandler _instance;

   /** @return the Singleton instance of the GPSHandler */
   public static GPSHandler getInstance() {
      if (_instance == null) {
         _instance = new GPSHandler();
      }
      return _instance;
   }

   /** not publicly accessible ... use getInstance() */
   private GPSHandler() { 
   }

   /** call this to trigger a new location fix */
   public void requestLocationUpdates() {
       if (_gpsThread == null || !_gpsThread.isAlive()) {
          _gpsThread = new GPSThread();
          _gpsThread.start(); 
       }
   }

   public void setListener(GPSListener listener) {
      // only supports one listener this way
      _listener = listener;   
   }

   private void setLocation(final Coordinates value) {
      _location = value;
      if (value.getLatitude() != 0.0 || value.getLongitude() != 0.0) {
         _gotLocation = true;
         if (_listener != null) {
            // this assumes listeners are UI listeners, and want callbacks on the UI thread:
            UiApplication.getUiApplication().invokeLater(new Runnable() {
               public void run() {
                  _listener.onLocationReceived(value);
               }
            });
         }
      }
   }

   private class GPSThread extends Thread {

      private void getLocationFromGoogle() {
         try { 
            int cellID = GPRSInfo.getCellInfo().getCellId(); 
            int lac = GPRSInfo.getCellInfo().getLAC(); 

            String urlString2 = "http://www.google.com/glm/mmap"; 

            // Open a connection to Google Maps API  
            ConnectionFactory connFact = new ConnectionFactory(); 
            ConnectionDescriptor connDesc; 
            connDesc = connFact.getConnection(urlString2); 

            HttpConnection httpConn2; 
            httpConn2 = (HttpConnection)connDesc.getConnection(); 
            httpConn2.setRequestMethod("POST"); 

            // Write some custom data to Google Maps API  
            OutputStream outputStream2 = httpConn2.openOutputStream();//getOutputStream(); 
            writeDataGoogleMaps(outputStream2, cellID, lac); 

            // Get the response   
            InputStream inputStream2 = httpConn2.openInputStream();//getInputStream(); 
            DataInputStream dataInputStream2 = new DataInputStream(inputStream2); 

            // Interpret the response obtained  
            dataInputStream2.readShort(); 
            dataInputStream2.readByte(); 

            final int code = dataInputStream2.readInt(); 
            UiApplication.getUiApplication().invokeLater(new Runnable() {
               public void run() {
                  Dialog.alert(code + "");   
               }
            });                        

            if (code == 0) { 
               final double latitude = dataInputStream2.readInt() / 1000000D; 
               final double longitude = dataInputStream2.readInt() / 1000000D; 
               setLocation(new Coordinates(latitude, longitude, 0.0f));

               UiApplication.getUiApplication().invokeLater(new Runnable() {
                  public void run() {
                     Dialog.alert(latitude+"-----"+longitude);   
                  }
               });

               dataInputStream2.readInt(); 
               dataInputStream2.readInt(); 
               dataInputStream2.readUTF(); 
            } else { 
               System.out.println("Error obtaining Cell Id "); 
            } 
            outputStream2.close(); 
            inputStream2.close(); 
         } catch (Exception e) { 
            System.out.println("Error: " + e.getMessage()); 
         } 
      }

      private void tryGetLocationFromDevice() {
         _gotLocation = false;
         try {
            Criteria myCriteria = new Criteria(); 
            myCriteria.setCostAllowed(false); 
            LocationProvider myLocationProvider = LocationProvider.getInstance(myCriteria); 

            try { 
               Location myLocation = myLocationProvider.getLocation(300); 
               setLocation(myLocation.getQualifiedCoordinates()); 
            } catch ( InterruptedException iex ) { 
               System.out.println(iex.getMessage());
            } catch ( LocationException lex ) { 
               System.out.println(lex.getMessage());
            } 
         } catch ( LocationException lex ) { 
            System.out.println(lex.getMessage());
         }

         if (!_gotLocation) { 
            getLocationFromGoogle();
         } 
      }

      public void run() { 
         int bbMapsHandle = CodeModuleManager.getModuleHandle("net_rim_bb_lbs");    // OS < 6.0
         int bbMapsHandle60 = CodeModuleManager.getModuleHandle("net_rim_bb_maps"); // OS 6.0+
         if (bbMapsHandle > 0 || bbMapsHandle60 > 0) { 
            tryGetLocationFromDevice();
         } else {
            getLocationFromGoogle();
         }
      } 
   } 

   private void writeDataGoogleMaps(OutputStream out, int cellID, int lac) throws IOException { 
      DataOutputStream dataOutputStream = new DataOutputStream(out); 
      dataOutputStream.writeShort(21); 
      dataOutputStream.writeLong(0); 
      dataOutputStream.writeUTF("en"); 
      dataOutputStream.writeUTF("Android"); 
      dataOutputStream.writeUTF("1.0"); 
      dataOutputStream.writeUTF("Web"); 
      dataOutputStream.writeByte(27); 
      dataOutputStream.writeInt(0); 
      dataOutputStream.writeInt(0); 
      dataOutputStream.writeInt(3); 
      dataOutputStream.writeUTF(""); 

      dataOutputStream.writeInt(cellID); 
      dataOutputStream.writeInt(lac); 

      dataOutputStream.writeInt(0); 
      dataOutputStream.writeInt(0); 
      dataOutputStream.writeInt(0); 
      dataOutputStream.writeInt(0); 
      dataOutputStream.flush(); 
   } 

}

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