public class LocationUtils {

  private volatile static LocationUtils uniqueInstance;
  private LocationManager locationManager;
  private String locationProvider;
  private Location location;
  private Context mContext;

  private LocationUtils(Context context) {
    mContext = context;
    getLocation();
  }

  //采用Double CheckLock(DCL)实现单例
  public static LocationUtils getInstance(Context context) {
    if (uniqueInstance == null) {
      synchronized (LocationUtils.class) {
        if (uniqueInstance == null) {
          uniqueInstance = new LocationUtils( context );
        }
      }
    }
    return uniqueInstance;
  }

  private void getLocation() {
    //1.获取位置管理器
    locationManager = (LocationManager) mContext.getSystemService( Context.LOCATION_SERVICE );
    //2.获取位置提供器，GPS或是NetWork
    List<String> providers = locationManager.getProviders( true );
    if (providers.contains( LocationManager.NETWORK_PROVIDER )) {
      //如果是网络定位
      Log.d( TAG, "如果是网络定位" );
      locationProvider = LocationManager.NETWORK_PROVIDER;
    } else if (providers.contains( LocationManager.GPS_PROVIDER )) {
      //如果是GPS定位
      Log.d( TAG, "如果是GPS定位" );
      locationProvider = LocationManager.GPS_PROVIDER;
    } else {
      Log.d( TAG, "没有可用的位置提供器" );
      return;
    }
    // 需要检查权限,否则编译报错,想抽取成方法都不行,还是会报错。只能这样重复 code 了。
    if (Build.VERSION.SDK_INT >= 23 &&
        ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
        ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED) {
      return;
    }
    if (ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED) {
      return;
    }
    //3.获取上次的位置，一般第一次运行，此值为null
    Location location = locationManager.getLastKnownLocation( locationProvider );
    if (location != null) {
      setLocation( location );
    }
    // 监视地理位置变化，第二个和第三个参数分别为更新的最短时间minTime和最短距离minDistace
    locationManager.requestLocationUpdates( locationProvider, 0, 0, locationListener );
  }

  private void setLocation(Location location) {
    this.location = location;
    String address = "纬度：" + location.getLatitude() + "经度：" + location.getLongitude();
    Log.d( TAG, address );
  }

  //获取经纬度
  public Location showLocation() {
    return location;
  }

  // 移除定位监听
  public void removeLocationUpdatesListener() {
    // 需要检查权限,否则编译不过
    if (Build.VERSION.SDK_INT >= 23 &&
        ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
        ActivityCompat.checkSelfPermission( mContext, Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED) {
      return;
    }
    if (locationManager != null) {
      uniqueInstance = null;
      locationManager.removeUpdates( locationListener );
    }
  }

  /**
  * LocationListern监听器
  * 参数：地理位置提供器、监听位置变化的时间间隔、位置变化的距离间隔、LocationListener监听器
  */

  LocationListener locationListener = new LocationListener() {

    /**
    * 当某个位置提供者的状态发生改变时
    */
    @Override
    public void onStatusChanged(String provider, int status, Bundle arg2) {

    }

    /**
    * 某个设备打开时
    */
    @Override
    public void onProviderEnabled(String provider) {

    }

    /**
    * 某个设备关闭时
    */
    @Override
    public void onProviderDisabled(String provider) {

    }

    /**
    * 手机位置发生变动
    */
    @Override
    public void onLocationChanged(Location location) {
      location.getAccuracy();//精确度
      setLocation( location );
    }
  };

}

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate( savedInstanceState );
    setContentView( R.layout.activity_main );
    Button btn = (Button) findViewById( R.id.btn );
    final TextView text = (TextView) findViewById( R.id.text );
    btn.setOnClickListener( new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Location location = LocationUtils.getInstance( MainActivity.this ).showLocation();
        if (location != null) {
          String address = "纬度：" + location.getLatitude() + "经度：" + location.getLongitude();
          Log.d( "FLY.LocationUtils", address );
          text.setText( address );
        }

      }
    } );
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    LocationUtils.getInstance( this ).removeLocationUpdatesListener();
  }
}