[เขียนแอพAndroid] พอดีเขียนโค๊ดระบุพิกัดตามหนังสือ แต่ัมันออกมาแต่ hello worldอะครับ

อันนนี้ผมไว้ในAndroidManifest.xml <uses-permission android:name = "android.permission.ACCESS_COARSE_LOCATION" ></uses>
                                     <uses-permission android:name = "android.permission.INTERNET" ></uses>

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พวกนี้ผมไว้ใน.java แล้วแทรกโค๊ดตามตำแหน่งในหนังสือครับ

package com.Lc.lc;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;

public class MainActivity extends FragmentActivity {
    
    private static final int TIME = 2000 ;
    private static final int DISTANCE = 1;
    private LocationManager lcm;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        lcm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }
    
    
    
    @Override
    public void onResume(){
         super.onResume();
         lcm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                 TIME,
                 DISTANCE,
                 listener);
    }
    
    private final LocationListener listener = new LocationListener(){
        @Override
        public void onLocationChanged(Location location) {
            
        }
            @Override
            public void onProviderDisabled(String arg0){
                
            }
                @Override
                public void onProviderEnabled(String arg0){
                    
                }
                    @Override
                    public void onStatusChanged(String arg0,int arg1 , Bundle arg2){
                        
                    }
                    
    };
    
    @Override
    public void onStop() {
        super.onStop();
        lcm.removeUpdates(listener);
    }
    
    private void updateWithNewLocation(Location location){
        TextView tv = new TextView(this);
        setContentView(tv);tv.setTextSize(20);
        
        String latLongString = "";
if(location != null){
    double lat = location.getLatitude();
    double lng = location.getLongitude();
    latLongString = "Lat:" + lat + "\nLong:" + lng;
    }else {
        latLongString = "No location found";
    }
tv.setText("Your Current location:\n" + latLongString);
    }
    
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            return rootView;
        }
    }

}