發送GPS座標到服務器的Android應用程序正在崩潰

我正在構建一個android應用程序，它將GPS座標發送到服務器，但它在顯示gps座標之後立即崩潰，根本不向服務器發送座標。發送GPS座標到服務器的Android應用程序正在崩潰

我MainActivity.java是

import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.apache.http.util.EntityUtils; 
import android.R.string; 
import android.app.Activity; 
import android.content.Context; 
import android.location.Criteria; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.widget.TextView; 
import android.widget.Toast; 



public class MainActivity extends Activity implements LocationListener{ 


private TextView latituteField; 
    private TextView longitudeField; 
    private LocationManager locationManager; 
    private String provider; 
    String lat; 
String lng; 


/** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    latituteField = (TextView) findViewById(R.id.TextView02); 
    longitudeField = (TextView) findViewById(R.id.TextView04); 

    // Get the location manager 
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    // Define the criteria how to select the locatioin provider -> use 
    // default 
    Criteria criteria = new Criteria(); 
    provider = locationManager.getBestProvider(criteria, false); 
    Location location = locationManager.getLastKnownLocation(provider); 

    // Initialize the location fields 
    if (location != null) { 
     System.out.println("Provider " + provider + " has been selected."); 
     onLocationChanged(location); 
    } else { 
     latituteField.setText("Location not available"); 
     longitudeField.setText("Location not available"); 
    } 
    } 

    /* Request updates at startup */ 
    @Override 
    protected void onResume() { 
    super.onResume(); 
    locationManager.requestLocationUpdates(provider, 400, 1, this); 
    } 

    /* Remove the locationlistener updates when Activity is paused */ 
    @Override 
    protected void onPause() { 
    super.onPause(); 
    locationManager.removeUpdates(this); 
    } 




    @Override 
    public void onLocationChanged(Location location) { 
    lat = Double.toString(location.getLatitude()); 
    lng = Double.toString (location.getLongitude()); 
    latituteField.setText(String.valueOf(lat)); 
    longitudeField.setText(String.valueOf(lng)); 
    longitudeField.setText(String.valueOf(lng)); 
    LoadServerASYNC task = new LoadServerASYNC(); 
    task.execute(); 


     } 



    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
    // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderEnabled(String provider) { 
    Toast.makeText(this, "Enabled new provider " + provider, 
     Toast.LENGTH_SHORT).show(); 

    } 

    @Override 
    public void onProviderDisabled(String provider) { 
    Toast.makeText(this, "Disabled provider " + provider, 
     Toast.LENGTH_SHORT).show(); 
    } 

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

    @Override 
    protected String doInBackground(String... arg0) { 
     postData(lat,lng); 
     StringBuilder builder = new StringBuilder(); 
      HttpClient client = new DefaultHttpClient(); 
     return null; 
    } 

    public void postData(String currLat, String currLon) { 
     // List with arameters and their values 

     String Text2 = "String is: " + 

     "Latitud = " + currLat + 

     "Longitud = " + currLon; 

     Toast.makeText(getApplicationContext(), Text2, Toast.LENGTH_LONG).show(); 

     HttpPost post = new HttpPost("http://www.url.com/*.php"); 
     List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); 
     nameValuePairs.add(new BasicNameValuePair("myusername", currLat)); 
     nameValuePairs.add(new BasicNameValuePair("mypassword", currLon)); 
     HttpClient client = new DefaultHttpClient();  

     try { 
      post.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      HttpResponse response = client.execute(post); 
      HttpEntity entity = response.getEntity(); 
      String responseText = EntityUtils.toString(entity); 
      responseText = responseText.trim(); 

     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     } 
     } 
     }

這裏是我的logcat

01-21 06:16:17.400: I/System.out(1107): Provider gps has been selected. 
    01-21 06:16:17.630: D/gralloc_goldfish(1107): Emulator without GPU emulation detected. 
    01-21 06:16:17.790: W/dalvikvm(1107): threadid=11: thread exiting with uncaught  exception (group=0xb4a15ba8) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): FATAL EXCEPTION: AsyncTask #1 
    01-21 06:16:17.820: E/AndroidRuntime(1107): Process: com.example.gpsexample2a, PID: 1107 
    01-21 06:16:17.820: E/AndroidRuntime(1107): java.lang.RuntimeException: An error occured while executing doInBackground() 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.os.AsyncTask$3.done(AsyncTask.java:300) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at java.lang.Thread.run(Thread.java:841) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.os.Handler.<init>(Handler.java:200) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.os.Handler.<init>(Handler.java:114) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.widget.Toast$TN.<init>(Toast.java:327) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.widget.Toast.<init>(Toast.java:92) 
    01-21 06:16:17.820: E/AndroidRuntime(1107):  at android.widget.Toast.makeText(Toast.java:241) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): at com.example.gpsexample2a.MainActivity$LoadServerASYNC.postData(MainActivity.java:143) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): at com.example.gpsexample2a.MainActivity$LoadServerASYNC.doInBackground(MainActivity.java:128) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): at com.example.gpsexample2a.MainActivity$LoadServerASYNC.doInBackground(MainActivity.java:1) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): at android.os.AsyncTask$2.call(AsyncTask.java:288) 
    01-21 06:16:17.820: E/AndroidRuntime(1107): at java.util.concurrent.FutureTask.run(FutureTask.java:237)

來源

2014-01-21 Anand K

從POSTDATA方法刪除此行

Toast.makeText(getApplicationContext(), Text2, Toast.LENGTH_LONG).show();

你不能調用吐司方法doInBackground(String... arg0)

或使用Handler

來源

2014-01-21 12:02:11

或使用處理程序爲你的工作 – alecnash

@alecnash同意你 –

@alecnash可以請你告訴我如何在這裏使用處理程序 –

問題是相關型號到這行代碼：

Toast.makeText(getApplicationContext(), Text2, Toast.LENGTH_LONG).show();

此代碼相關型號的UI比賽和Android要運行它本次比賽，而不是在後臺線程。

爲此有此日誌：

例外：（）內螺紋已不叫Looper.prepare無法創建處理程序

來源

2014-01-21 12:03:41

您應該使用

runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 
        // TODO Auto-generated method stub 
        Toast.makeText(getApplicationContext(),data, Toast.LENGTH_LONG).show(); 
       } 
      });

來源

2014-01-21 12:23:10

Toast.makeText(getApplicationContext(), Text2, Toast.LENGTH_LONG).show();

in postData方法是原因。您不應該在AsyncTask類上執行UI-Task「 doInBackground（）「方法。但是，您可以使用其他方法（如「onPreExecute（）」，「onProgressUpdate（）」，「onPostExecute（）」）來顯示Toast。要知道，如何正確使用AyncTask類，請參閱this link

來源

2014-01-21 12:35:40

發送GPS座標到服務器的Android應用程序正在崩潰

回答

相關問題