How To Get Gps Location Using Asynctask?

I have seen many answers for this type of question but its not related with my task. I am trying to get gps location in background but i got exception as Cant Create Handler Inside

Solution 1:

Finally i figured out the problem, I think this will help some one like me

publicclassGPSLocationextendsAsyncTask<Void, Void, Void>
    {  
        boolean running =true;
                @OverrideprotectedvoidonPreExecute()
                {  
                    super.onPreExecute(); 
                    progressDialog = newProgressDialog(RoadMaintenanceActivity.this);
                    progressDialog.setOnCancelListener(newDialogInterface.OnCancelListener(){
                          publicvoidonCancel(DialogInterface dialog) {
                              getgps.cancel(true);  
                          }
                    });
                    LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
                    LocationListener mlocListener = newMyLocationListener();  
                    mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);    
                    progressDialog.setCancelable(true);
                    progressDialog.setMessage("Getting GPS Location...");
                    progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                    progressDialog.setProgress(1);
                    progressDialog.show();

                } 

                @OverrideprotectedvoidonProgressUpdate(Void... values) {
                    super.onProgressUpdate(values);
                    // Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
                 }

                @OverrideprotectedvoidonPostExecute(Void result)
                {  
                        progressDialog.cancel(); 
                }

                @OverrideprotectedVoiddoInBackground(Void... params) {  
                    boolean isDataSubmitted = false;

                    while(!isDataSubmitted)
                    {  
                        if(longitude !=0 && latitude!=0)
                        { 
                            sendSMS();
                            isDataSubmitted = true;  
                        }  
                    } 

                    returnnull;    
                } 
     } 

By having Locationmanager in onPreExecute() the exception get rid out from my application. We can get the gps in onpreexecute rather than doinbackground().

Solution 2:

You can't do that.The mlocListener requires a Looper thread to operate.

in doInBackground Call Looper.prepare();

So your code will become something like this.

@OverrideprotectedVoiddoInBackground(Void... params) { 
            Looper.myLooper().prepare();
            boolean isGps = false;
            -----------------

Solution 3:

this seems suitable for what I'm trying to do at the moment. Any chance you can show me the full source? I currently have it worked into my code, but I'd like to see how you are getting the GPS co ords and starting the async

ProgressDialog progressDialog;
double longitude, latitude;


@OverridepublicvoidonCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_confirm_screen);
    SharedPreferencessp= PreferenceManager.getDefaultSharedPreferences(this);
    BooleanlocationCheck= sp.getBoolean("LOCATION", false);
   if(locationCheck){

    }
   else
   {
    sendEmail();
    playSound();
   }

}

publicclassGPSLocationextendsAsyncTask<Void, Void, Void>
{  
    booleanrunning=true;
            @OverrideprotectedvoidonPreExecute()
            {  
                super.onPreExecute(); 
                progressDialog = newProgressDialog(ConfirmScreen.this);
                progressDialog.setOnCancelListener(newDialogInterface.OnCancelListener(){
                      publicvoidonCancel(DialogInterface dialog) {
                          getgps.cancel(true);  
                      }
                });

                LocationManagermlocManager= (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
                LocationListenermlocListener=newMyLocationListener();  
                mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);    
                progressDialog.setCancelable(true);
                progressDialog.setMessage("Getting GPS Location...");
                progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                progressDialog.setProgress(1);
                progressDialog.show();

            } 

            @OverrideprotectedvoidonProgressUpdate(Void... values) {
                super.onProgressUpdate(values);
                // Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
             }

            @OverrideprotectedvoidonPostExecute(Void result)
            {  
                    progressDialog.cancel(); 
            }

            @Overrideprotected Void doInBackground(Void... params) {  
                booleanisDataSubmitted=false;

                while(!isDataSubmitted)
                {  
                    if(longitude !=0 && latitude!=0)
                    { 
                        sendEmail();
                        isDataSubmitted = true;  
                    }  
                } 

                returnnull;    
            } 
 } 


publicvoidbackHome(View view) 
{
    Intentintent=newIntent (this, MainScreen.class);
    startActivity(intent);
}

// Method to start playing and looping a sound.publicvoidplaySound()
{
    MediaPlayerclickSound= MediaPlayer.create(this, R.raw.warning);
    SharedPreferencessp= PreferenceManager.getDefaultSharedPreferences(this);
    BooleansoundCheck= sp.getBoolean("SOUND", false);
    if (soundCheck)
    {
        clickSound.start();
    }



}// method endpublicvoidsendEmail()
{
    SharedPreferencessp= PreferenceManager.getDefaultSharedPreferences(this);
    StringnameValue= sp.getString("NAME", "failed to get name");
    StringemailValue= sp.getString("EMAIL", "failed to get email");
    Intenti=newIntent(Intent.ACTION_SEND);
    i.setType("message/rfc822");
    i.putExtra(Intent.EXTRA_EMAIL, newString[]{emailValue});
    i.putExtra(Intent.EXTRA_SUBJECT, "Email sent from DON'T PANIC - A Chris O'Brien Project");
    i.putExtra(Intent.EXTRA_TEXT, "Hi there\n" + nameValue + " is in mortal danger. They didn't include co-ords as they assume you know where they are..\nKind Regards\nDon't Panic! \n\n\n");

    try
    {   startActivity(Intent.createChooser(i, "Send mail...."));
    } 
    catch (android.content.ActivityNotFoundException ex){

        Toast.makeText(ConfirmScreen.this, "There are no email clients installed or set up", Toast.LENGTH_SHORT).show();
    }
}


publicvoidsendEmail(String a, String b, String c)
{
    SharedPreferencessp= PreferenceManager.getDefaultSharedPreferences(this);
    StringnameValue= sp.getString("NAME", "failed to get name");
    StringemailValue= sp.getString("EMAIL", "failed to get email");
    Intenti=newIntent(Intent.ACTION_SEND);
    i.setType("message/rfc822");
    i.putExtra(Intent.EXTRA_EMAIL, newString[]{emailValue});
    i.putExtra(Intent.EXTRA_SUBJECT, "Email sent from DON'T PANIC - A Chris O'Brien Project");
    i.putExtra(Intent.EXTRA_TEXT, "Hi there\n" + nameValue + " is in mortal danger. Please see the co-ords attached and run to their rescue!" +
            " If you don't see any co-ords, they didn't check the box and assume you know where they are.\nKind Regards\nDon't Panic! \n\n\n" + 
            a + b + c);

    try
    {   startActivity(Intent.createChooser(i, "Send mail...."));
    } 
    catch (android.content.ActivityNotFoundException ex){

        Toast.makeText(ConfirmScreen.this, "There are no email clients installed or set up", Toast.LENGTH_SHORT).show();
    }
}


@OverridepublicbooleanonCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_confirm_screen, menu);
    returntrue;
}






}