强制关闭应用程序，何时获取地址..NULL异常

Question

我试图通过 ihrupin 从 http://www.hrupin.com/2011/04/android-gps-using-how-to-get-current-location-example

它工作正常，直到我添加通过地理编码在 onLocationChanged 中获取地址形式的纬度和经度

这是代码：

---

buttonGetLocation.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v) 
            {
                progress.setVisibility(View.VISIBLE);
                // exceptions will be thrown if provider is not permitted.
                try 
                {
                    gps_enabled = locManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
                } 
                catch (Exception ex) 
                {
                }
                try 
                {
                    network_enabled = locManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
                } 
                catch (Exception ex) 
                {
                }

                // don't start listeners if no provider is enabled      

                if (gps_enabled) 
                {
                    locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locListener);
                }
                if (network_enabled) 
                {
                    locManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locListener);
                }
            }
        });

        locManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    }



    class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location location) {
            if (location != null) {
                // This needs to stop getting the location data and save the battery power.
                locManager.removeUpdates(locListener); 

                String londitude = "Londitude: " + location.getLongitude();
                String latitude = "Latitude: " + location.getLatitude();
                String altitiude = "Altitiude: " + location.getAltitude();
                String accuracy = "Accuracy: " + location.getAccuracy();
                String time = "Time: " + location.getTime();

                //
                String address = "Adress : "+goToGeocoder(location.getLatitude().getLongitude());

                editTextShowLocation.setText(londitude + "\n" + latitude + "\n" + altitiude + "\n" + accuracy + "\n" + address);
                progress.setVisibility(View.GONE);
            } 
        }
Context context;
    public String goToGeocoder(String ll)
    {
        List<Address> almt;
        String alamat = null;
        double lat,lng;
        StringBuilder sb = new StringBuilder();
        lat = Double.parseDouble(ll.substring(0,ll.indexOf(",")-1));
        lng = Double.parseDouble(ll.substring(ll.indexOf(",")+1));

        try
        {
            Geocoder geocoder = new Geocoder(context, Locale.getDefault());
            almt = geocoder.getFromLocation(lat, lng, 5);
            if(almt.size()>0)
            {
                Address almtSkrng = almt.get(0);
                String admin_area = sb.append(almtSkrng.getAdminArea()).toString();
                if(almtSkrng.getAddressLine(0).equals(null) || almtSkrng.getAddressLine(0).equals(""))
                {
                    alamat = almtSkrng.getFeatureName();
                }
                alamat = almtSkrng.getAddressLine(0)+" "+almtSkrng.getAdminArea();
                //temp_koordinate.setAlamat(alamat);
            }
            else
            {
                alamat = "";
                //temp_koordinate.setAlamat(alamat);
            }
        }       
        catch(IOException e)
        {
            //
        }
        return alamat;
    }

应用程序被强制关闭。

任何人都可以给出解决这个问题的解决方案吗？ 非常感谢 亲切的问候

Answer 1

如果不提供显示崩溃的日志（即堆栈跟踪），则很难回答强制关闭的原因...

如果没有该信息，答案可能是：

您需要处理地理编码返回 null 的情况。

if(almt != null) {
    //do what you need to do
} else {
    //handle the null situation here
}

或者您可以在 try/catch 语句中添加一个 catch 块来处理 NullPointerException。