如何使用AsyncTask获取GPS位置？

Question

我已经看到了很多这类问题的答案,但它与我的任务无关.我想在后台获取GPS位置,但我得到的例外是Cant Create Handler Inside Thread That Has Not Called Looper Prepare in Android在mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);.

public class GPSLocation extends AsyncTask<Void, Void, Void>
    {  
        @Override
        protected void onPreExecute()
        {  
            super.onPreExecute(); 
            progressDialog = new ProgressDialog(RoadMaintenanceActivity.this);
            progressDialog.setCancelable(true);
            progressDialog.setMessage("Getting GPS Location...");
            progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            progressDialog.setProgress(1);
            progressDialog.show();

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

        @Override 
        protected void onPostExecute(Void result)
        { 

                progressDialog.cancel(); 
        }
        @Override
        protected Void doInBackground(Void... params) { 

            boolean isGps = false;

            while(!isGps)
            { 
                LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
                LocationListener mlocListener = new MyLocationListener();  
                mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);   
                if(longitude !=0 && latitude!=0)
                {
                    isGps = true; 
                    sendSMS();
                }  
            } 

            return null;  


        }

     } 

我不知道为什么我们不能在doBackground()方法中调用它.

谢谢你的帮助.

Answer 1

最后我想出了问题,我想这会对像我这样的人有所帮助

public class GPSLocation extends AsyncTask<Void, Void, Void>
    {  
        boolean running =true;
                @Override
                protected void onPreExecute()
                {  
                    super.onPreExecute(); 
                    progressDialog = new ProgressDialog(RoadMaintenanceActivity.this);
                    progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
                          public void onCancel(DialogInterface dialog) {
                              getgps.cancel(true);  
                          }
                    });
                    LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
                    LocationListener mlocListener = new MyLocationListener();  
                    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();

                } 

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

                @Override 
                protected void onPostExecute(Void result)
                {  
                        progressDialog.cancel(); 
                }

                @Override
                protected Void doInBackground(Void... params) {  
                    boolean isDataSubmitted = false;

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

                    return null;    
                } 
     } 

通过让Locationmanager在onPreExecute()异常中摆脱我的应用程序.我们可以在onpreexecute中获取gps而不是doinbackground().