How to put value of getLatitude() into textview

Question

I am developing an app that whenever you click on the get location (gpsBtn), GPS will be enabled and the Location of the user will be shown in a TextView. I get java.lang.NullPointerException error,the app has stops unexpectedly. How do I fix this?

 public class MainActivity extends AppCompatActivity {
        public LocationManager lm;
     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, new MyLocationListener());
            Button gpsBtn = (Button)findViewById(R.id.getLocation);
            gpsBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    showCurrentLocation();
                }
            });

        public void showCurrentLocation() {
            // TODO Auto-generated method stub
            final TextView textView=(TextView)findViewById(R.id.textView);
            Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            textView.setText(String.valueOf(location.getLatitude()));

        }
        class MyLocationListener implements LocationListener {
            @Override
            public void onLocationChanged(Location location) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub

            }

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

            }
        }

Android manifest:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mehrdad.myapplication" >
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_GPS" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />

</manifest>

check my answer and let me know,it work for you or not. – Deepak Goyal Aug 10 '15 at 17:01 — Deepak Goyal, Aug 10 '15 at 17:01
@DeepakGoyal its not work.. – Emadi_mehrdad Aug 10 '15 at 17:08 — Emadi_mehrdad, Aug 10 '15 at 17:08
@DeepakGoyal please help me.. – Emadi_mehrdad Aug 11 '15 at 09:45 — Emadi_mehrdad, Aug 11 '15 at 09:45
@DeepakGoyal help me again..please – Emadi_mehrdad Aug 17 '15 at 11:54 — Emadi_mehrdad, Aug 17 '15 at 11:54

Deepak Goyal · Accepted Answer · 2015-08-10T17:09:26.310

try.....move your final TextView textView=(TextView)findViewById(R.id.textView); to the onCreate() method. Also add textView.setText(String.valueOf(location.getLatitude())); line inside the try and catch block.

try{
 textView.setText(String.valueOf(location.getLatitude()));
}catch(Exception e){
  // exception occurs......
}

FULL CODE

public class MainActivity extends AppCompatActivity {
        public LocationManager lm;
        TextView textView;
     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, new MyLocationListener());
            textView = (TextView)findViewById(R.id.textView);
            Button gpsBtn = (Button)findViewById(R.id.getLocation);
            gpsBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    showCurrentLocation();
                }
            });

        public void showCurrentLocation() {
            // TODO Auto-generated method stub
            Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            try{
                textView.setText(String.valueOf(location.getLatitude()));
            }catch(Exception e){
              // exception occurs......
            }
        }
        class MyLocationListener implements LocationListener {
            @Override
            public void onLocationChanged(Location location) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub

            }

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

            }
        }

can you add textView.setText(String.valueOf(location.getLatitude())); inside the try and catch block? i cant.. — Emadi_mehrdad, Aug 10 '15 at 17:03
check my updated answer. and if still not work, can you post your logcat error.... — Deepak Goyal, Aug 10 '15 at 17:10
no need to declare the textview final. Just do as of my answer. Let it try first. — Deepak Goyal, Aug 10 '15 at 17:17
it means your location.getLatitude() returs null or empty string. — Deepak Goyal, Aug 10 '15 at 18:33
System.out.println("Location is "+location.getLatitude()); and tell me what is the output. — Deepak Goyal, Aug 10 '15 at 18:56
getLastKnownLocation returns null if any Location has been acquired from the http://developer.android.com/reference/android/location/LocationManager.html#getLastKnownLocation%28java.lang.String%29 — Deepak Goyal, Aug 10 '15 at 19:48
see this thread http://stackoverflow.com/questions/9873190/my-current-location-always-returns-null-how-can-i-fix-this — Deepak Goyal, Aug 19 '15 at 16:02

How to put value of getLatitude() into textview

1 Answers1