不能理解片段取代

Question

我在FragmentTransaction.replace(id, fragment, 'string')很難理解什麼呢.replace實際上

我讀的地方，它會與片段，但在我

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

       if (findViewById(R.id.fragment_container) !=null) { 
        if(savedInstanceState!=null){ 
         return ; 
        } 
        ArticleFragment first_fragment = new ArticleFragment(); 
        HeadlineFragment second_fragment = new HeadlineFragment(); 
        first_fragment.setArguments(getIntent().getExtras()); 
        second_fragment.setArguments(getIntent().getExtras()); 
        FragmentTransaction manager=getSupportFragmentManager().beginTransaction(); 
        manager.add(R.id.fragment_container, first_fragment,"first"); 
        manager.add(R.id.fragment_container, second_fragment,"second"); 
        manager.commit(); 
       } 
       abc newFragment = new abc(); 
       Bundle args = new Bundle(); 
       FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
       transaction.replace(R.id.fragment_container, newFragment,"second"); 
       transaction.addToBackStack(null); 
       transaction.commit(); 
      } 
     } 

更換視圖id的內容，只替換第一片段，我添加到Transaction，即first_fragment。

我如何替換特定的片段？

Answer 1

該問題似乎與R.id.fragment_container。你應該有上線不同的第一個參數如下，以取代片段，是不是你的「第一次」片段：

manager.add(R.id.fragment_container, second_fragment,"second");