Android 通过 intent传值获得null

我在通过intent 获得传递兑现过的时候报错，空指针,我是getMap方法进行传值，代码如下

public           void           getMap(View view){          


                      


                      Intent i =            new           Intent(           this           , BreweryYourTopBeers.           class           );          


                      Log.d(           "map"           , e.beerBreweryId);          


                      i.putExtra(           "breweryID"           ,  e.beerBreweryId);          


                      i.setClass(           this           , BreweryMap.           class           );          


                      


                      startActivity(i);          


                      }

从我的日志中能够看到  在传值之前e.beerBreweryId  确实有值，我在下面的代码中获取改值

public           class           BreweryMap            extends           ActionbarMenu {          


                      BeerData e;          


                      String beerID;          


                      GoogleMap map;          


                      //从bundle  中获得beer  详细信息          


                      protected           void           onCreate(Bundle savedInstanceState) {          


                      super           .onCreate(savedInstanceState);          


                      setContentView(R.layout.activity_brewerymap);          


                      //get brewery data          


                      //get beer data          


                      Intent intent = getIntent();          


                      Bundle extras = intent.getExtras();          


                      


                      String breweryID = extras.getString(           "brewreyID"           );          


                      map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();          


                      String url =            "http://api.brewerydb.com/v2/brewery/"           + breweryID +           "?key=myKey&format=json&withLocations=y"           ;          


                      Log.d(           "map"           , url);          


                      new           myAsyncTask(           this           ,map).execute(url);          


           }          


           }

我每次获得值都是NULL ，不知道是什么原因.

处理方法

有一行写错误了.
把
String breweryID = extras.getString("brewreyID");
换成
String breweryID = extras.getString("breweryID");