如何将GPS位置值传递给android中的其他类？

Question

我使用类来获得纬度和经度值，经过检查我确认数据是正确的，但我面临的问题是如何将值传递给其他函数并将其发送到PHP脚本，所以我可以存储值。这两个功能都属于同一类。以下是我的获取位置类代码。

从这里我得到的GPS价值。

public void get_location(){ 

    // Acquire a reference to the system Location Manager 
    LocationManager locationManager = (LocationManager) LoginActivity.this.getSystemService(Context.LOCATION_SERVICE); 
    // Define a listener that responds to location updates 
    LocationListener locationListener = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      // Called when a new location is found by the network location provider. 
      String lat = Double.toString(location.getLatitude()); 
      String lon = Double.toString(location.getLongitude()); 
     } 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
     public void onProviderEnabled(String provider) {} 
     public void onProviderDisabled(String provider) {} 
    }; 
    // Register the listener with the Location Manager to receive location updates 
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); 

} 

我需要将值传递给此函数，以便它可以发送到服务器。

public class SendPostRequest extends AsyncTask<String, Void, String> { 

    protected void onPreExecute(){} 

    protected String doInBackground(String... arg0) { 

     try { 
      URL url = new URL("http://localhost.com/save.php"); 

      JSONObject postDataParams = new JSONObject(); 
      postDataParams.put("lat", lat); 
      postDataParams.put("lon", lon); 
      Log.e("params",postDataParams.toString()); 

      HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
      conn.setReadTimeout(15000 /* milliseconds */); 
      conn.setConnectTimeout(15000 /* milliseconds */); 
      conn.setRequestMethod("POST"); 
      conn.setDoInput(true); 
      conn.setDoOutput(true); 

      OutputStream os = conn.getOutputStream(); 
      BufferedWriter writer = new BufferedWriter(
        new OutputStreamWriter(os, "UTF-8")); 
      writer.write(getPostDataString(postDataParams)); 

      writer.flush(); 
      writer.close(); 
      os.close(); 

      int responseCode=conn.getResponseCode(); 

      if (responseCode == HttpsURLConnection.HTTP_OK) { 

       BufferedReader in=new BufferedReader(new 
         InputStreamReader(
         conn.getInputStream())); 

       StringBuffer sb = new StringBuffer(""); 
       String line=""; 

       while((line = in.readLine()) != null) { 

        sb.append(line); 
        break; 
       } 

       in.close(); 
       return sb.toString(); 

      } 
      else { 
       return new String("false : "+responseCode); 
      } 
     } 
     catch(Exception e){ 
      return new String("Exception: " + e.getMessage()); 
     } 

    } 

    @Override 
    protected void onPostExecute(String result) { 
     Toast.makeText(getApplicationContext(), result, 
       Toast.LENGTH_LONG).show(); 
    } 
} 

public String getPostDataString(JSONObject params) throws Exception { 

    StringBuilder result = new StringBuilder(); 
    boolean first = true; 

    Iterator<String> itr = params.keys(); 

    while(itr.hasNext()){ 

     String key= itr.next(); 
     Object value = params.get(key); 

     if (first) 
      first = false; 
     else 
      result.append("&"); 

     result.append(URLEncoder.encode(key, "UTF-8")); 
     result.append("="); 
     result.append(URLEncoder.encode(value.toString(), "UTF-8")); 

    } 
    return result.toString(); 
} 

这里是我执行ASYN任务

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    new SendPostRequest().execute(); 

} 

Answer 1

创建全球Double数组（非常基本的）：

static Double[] arr; 

在你onCreate：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    new SendPostRequest().execute(arr); //changes made here 
} 

你get_location方法：

public void get_location(){ 

    // Acquire a reference to the system Location Manager 
    LocationManager locationManager = (LocationManager) LoginActivity.this.getSystemService(Context.LOCATION_SERVICE); 
    // Define a listener that responds to location updates 
    LocationListener locationListener = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      // Called when a new location is found by the network location provider. 
      // getting location of user, don't parse to string latlng has to double 
      double lat = location.getLatitude(); 
      double lon = location.getLongitude(); 
      arr[0] = lat; //changes made here 
      arr[1] = lon; //changes made here 

     } 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
     public void onProviderEnabled(String provider) {} 
     public void onProviderDisabled(String provider) {} 
    }; 
    // Register the listener with the Location Manager to receive location updates 
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); 

} 

传递价值Asynctask：

public class SendPostRequest extends AsyncTask<Double, Void, String> { 

    protected void onPreExecute(){} 

    protected String doInBackground(Double arr) { 

     try { 
      URL url = new URL("http://localhost.com/save.php"); 

      JSONObject postDataParams = new JSONObject(); 
      postDataParams.put("lat", arr[0]); //changes made here 
      postDataParams.put("lon", arr[1]); //changes made here 
      Log.e("params",postDataParams.toString()); 

      HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
      conn.setReadTimeout(15000 /* milliseconds */); 
      conn.setConnectTimeout(15000 /* milliseconds */); 
      conn.setRequestMethod("POST"); 
      conn.setDoInput(true); 
      conn.setDoOutput(true); 

      OutputStream os = conn.getOutputStream(); 
      BufferedWriter writer = new BufferedWriter(
        new OutputStreamWriter(os, "UTF-8")); 
      writer.write(getPostDataString(postDataParams)); 

      writer.flush(); 
      writer.close(); 
      os.close(); 

      int responseCode=conn.getResponseCode(); 

      if (responseCode == HttpsURLConnection.HTTP_OK) { 

       BufferedReader in=new BufferedReader(new 
         InputStreamReader(
         conn.getInputStream())); 

       StringBuffer sb = new StringBuffer(""); 
       String line=""; 

       while((line = in.readLine()) != null) { 

        sb.append(line); 
        break; 
       } 

       in.close(); 
       return sb.toString(); 

      } 
      else { 
       return new String("false : "+responseCode); 
      } 
     } 
     catch(Exception e){ 
      return new String("Exception: " + e.getMessage()); 
     } 

    } 

    @Override 
    protected void onPostExecute(String result) { 
     Toast.makeText(getApplicationContext(), result, 
       Toast.LENGTH_LONG).show(); 
    } 
} 

public String getPostDataString(JSONObject params) throws Exception { 

    StringBuilder result = new StringBuilder(); 
    boolean first = true; 

    Iterator<String> itr = params.keys(); 

    while(itr.hasNext()){ 

     String key= itr.next(); 
     Object value = params.get(key); 

     if (first) 
      first = false; 
     else 
      result.append("&"); 

     result.append(URLEncoder.encode(key, "UTF-8")); 
     result.append("="); 
     result.append(URLEncoder.encode(value.toString(), "UTF-8")); 

    } 
    return result.toString(); 
} 

Answer 2

只要改变你的代码的这部分功能：

public class SendPostRequest extends AsyncTask<Double, Void, String> { 

protected void onPreExecute(){} 

protected String doInBackground(Double... arg0) { 

    try { 
     URL url = new URL("http://localhost.com/save.php"); 

     JSONObject postDataParams = new JSONObject(); 
     postDataParams.put("lat", args[0]); 
     postDataParams.put("lon", args[1]); 

和执行的AsyncTask：

new SendPostRequest().execute(lat,lon);