使用LocationListener和HttpUrlConnection發佈數據在AsyncTask中的即時位置

Question

我一直在解決這個問題。

我有一個AsyncTask，每20秒獲取用戶的網絡位置並將數據發佈到遠程服務器。

我已請求的權限，如圖屬於

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

這裏是MainActivitiy的OnCreate（）和代碼

public class TraficMain extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 
     setContentView(R.layout.activity_main); 

     new UrlPositionAsynck().execute(); 
    } 

    private class UrlPositionAsynck extends AsyncTask<Void, Void , String> { 

     public double longitude, latitude; 
     public URL url; 
     protected LocationManager locationManager; 

     @Override 
     protected void onPostExecute(String s) { 
      super.onPostExecute(s); 
     } 

     @Override 
     protected String doInBackground(Void... urlink) { 

      GPSPosition gpsPosition = new GPSPosition(TraficMain.this); 

      locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE); 
      locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 20000, 0, gpsPosition); 

      Position position = gpsPosition.getPosition(); 

      String params= "lb_lo=" + position.getLb_longitude() + "&lb_la=" + position.getLb_latitude(); 

      try { 
       url = new URL("http://myremote_url"); 
       byte[] param=params.getBytes("UTF-8"); 
       int postLength=param.length; 
       HttpURLConnection strConn = (HttpURLConnection) url.openConnection(); 
       strConn.setDoOutput(true); 
       strConn.setInstanceFollowRedirects(false); 
       strConn.setRequestMethod("POST"); 
       strConn.setConnectTimeout(60000); 
       strConn.setChunkedStreamingMode(0); 
       strConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
       strConn.setRequestProperty("charset", "utf-8"); 
       strConn.setRequestProperty("Content-Length", Integer.toString(postLength)); 
       strConn.setUseCaches(false); 
       OutputStream out=strConn.getOutputStream(); 
       BufferedWriter data =new BufferedWriter(new OutputStreamWriter(strConn.getOutputStream())); 
       data.write(params); 
       data.flush(); 
       data.close(); 
       out.flush(); 
       out.close(); 

       BufferedReader br = new BufferedReader(new InputStreamReader((strConn.getInputStream()))); 
       StringBuilder sb = new StringBuilder(); 
       String output; 
       while ((output = br.readLine()) != null) { 
        sb.append(output); 
       } 
      }catch(IOException io){ 
       Log.i("Connection Problem :", io.getMessage()); 
      } 

      return null; 
     } 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
     } 
    } 
} 

的其餘部分，我用這個類實現獲得位置LocationListener

public class GPSPosition implements LocationListener{ 

    Activity myContext; 
    public double longitude, latitude; 

    public GPSPosition(Activity context){ 
     this.myContext=context; 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     longitude = location.getLongitude(); 
     latitude = location.getLatitude(); 

     TextView txt = (TextView) this.myContext.findViewById(R.id.txtPosition); 
     txt.setText(longitude + ", " + latitude); 
    } 

    @Override 
    public void onProviderDisabled(String provider) {} 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 

    @Override 
    public void onProviderEnabled(String provider) {} 

    public Position getPosition(){ 
     return new Position(this.longitude, this.latitude); 
    } 

我的代碼已經過問題。我只在應用程序啓動並且經度和緯度始終等於0時發佈數據。

我期待將數據發佈到遠程服務器，每20秒鐘一次。 有人可以告訴如何處理這個問題來解決嗎？我已經花了整個週末

編輯 這是onCreate（）的新代碼。 即使設備更改位置，位置的值也不變，我不知道爲什麼會發生這種情況。

protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 
    setContentView(R.layout.activity_main); 

    final Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      final GPSPosition gpsPosition = new GPSPosition(TraficMain.this); 

      locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE); 
      locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, gpsPosition); 
      new UrlPositionAsynck().execute(gpsPosition.getPosition()); 
     } 
    }, 20000); 
} 

private class UrlPositionAsynck extends AsyncTask<Position, Void , String> { 
    public double longitude, latitude; 
    public URL url; 
    protected LocationManager locationManager; 

    @Override 
    protected void onPostExecute(String s) { 
     super.onPostExecute(s); 
    } 

    @Override 
    protected String doInBackground(Position... urlink) { 

     Position position = urlink[0]; 

     String params= "lb_lo=" + position.getLb_longitude() + "&lb_la=" + position.getLb_latitude(); 

     try { 
      url = new URL("http://remote_url"); 
      byte[] param=params.getBytes("UTF-8"); 
      int postLength=param.length; 
      HttpURLConnection strConn = (HttpURLConnection) url.openConnection(); 
      strConn.setDoOutput(true); 
      strConn.setInstanceFollowRedirects(false); 
      strConn.setRequestMethod("POST"); 
      strConn.setConnectTimeout(60000); 
      strConn.setChunkedStreamingMode(0); 
      strConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
      strConn.setRequestProperty("charset", "utf-8"); 
      strConn.setRequestProperty("Content-Length", Integer.toString(postLength)); 
      strConn.setUseCaches(false); 

      OutputStream out=strConn.getOutputStream(); 
      BufferedWriter data =new BufferedWriter(new OutputStreamWriter(strConn.getOutputStream())); 
      data.write(params); 
      data.flush(); 
      data.close(); 
      out.flush(); 
      out.close(); 

      BufferedReader br = new BufferedReader(new InputStreamReader((strConn.getInputStream()))); 
      StringBuilder sb = new StringBuilder(); 
      String output; 
      while ((output = br.readLine()) != null) { 
       sb.append(output); 
      } 
     }catch(IOException io){ 
      io.printStackTrace(); 
     } 
     return null; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
    } 
} 

Answer 1

你可以做一個處理程序，並通過做這樣

final Handler handler = new Handler(); 
handler.postDelayed(new Runnable() { 
    @Override 
    public void run() { 
new UrlPositionAsynck().execute(); 
     //Do something after 20 seconds 
     handler.postDelayed(this, 20000); 
    } 
}, 1000);