How can I return back to my Activity from GPS settings window

android:noHistory="true"

removing above from menifest file works for me but data is null inside onActivityResult

Works for me. Are you sure you have ACCESS_FINE_LOCATION permission set in your manifest? Are you sure startActivityForResult() is being called?

Also, what is GPS_LOC?

Here's my code that works:

public class main extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        findViewById(R.id.button1).setOnClickListener( new OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivityForResult(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS), 1);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == 1) {
           switch (requestCode) {
              case 1:
               break;
            }
         }  
     }
}