傳遞字符串從活動到碎片

Question

我Activty代碼片段是實現GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener：

@Override 
public void onConnected(Bundle bundle) { 
     getCurrentLocation();   
} 
public void getCurrentLocation() { 
    if (this.servicesConnected()) { 
     mLocationClient.requestLocationUpdates(mLocationRequest, this); 
     mCurrentLocation = mLocationClient.getLastLocation(); 
     ArrayList<Address> addresses = null; 
     try { 
      latitude = String.valueOf(mCurrentLocation.getLatitude()); 
      longitude = String.valueOf(mCurrentLocation.getLongitude()); 
      addresses = (ArrayList<Address>) gCoder. 
        getFromLocation(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude(), 1); 
      mLocationClient.disconnect(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     if (addresses != null && addresses.size() > 0) { 
      Log.wtf("Arsnal", "" + addresses.get(0).getLocality()); 
     } else { 
      Toast.makeText(this, R.string.no_address_found, Toast.LENGTH_LONG).show(); 
     } 
     Log.wtf("Location", "Lat " + latitude + " - lon " + longitude); 
    } 
} 

我只想讓我的片段字符串緯度和經度，即

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.wtf("check","Inside OnCreate of Fragment!"); 
    Log.wtf("check","Latitude"+((MyActivuty)getActivity()).latitude+ 
"Longitude"+((MyActivuty)getActivity()).longitude); 
} 

我得到NPE在這一行，即

Log.wtf("check","Latitude"+((MyActivuty)getActivity()).latitude+ 
"Longitude"+((MyActivuty)getActivity()).longitude); 

因爲在片段的OnC之後調用onComplete方法reate（）。我可以解決這個問題嗎？ 任何幫助表示讚賞感謝

Answer 1

片段內創建一個回調函數：

public void initFragment() { 
    // Coordinates are available do something with them 
    // ((MyActivuty)getActivity()).latitude 
    // ((MyActivuty)getActivity()).longitude 
} 

然後在您的活動保存到創建片段的引用：

MyFrag myFrag 
... 
myFrag = new MyFrag(); 
... 

，並致電片段的功能當座標準備好時：

public void getCurrentLocation() { 
    ... 
    myFrag.initFragment(); 
}