訪問查看片段中的元素

我有一個從其他活動接收數據的活動。該數據必須在活動中的一個片段中的TextView中顯示。所以，代碼：訪問查看片段中的元素

public class DetailActivity extends Activity { 

private int idEstablecimiento; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_detail); 

    if (savedInstanceState == null) { 
     getFragmentManager().beginTransaction() 
       .add(R.id.container, new PlaceholderFragment()).commit(); //Here the fragment is added to the activity 
    } 

    Bundle extras = getIntent().getExtras(); 
    if (extras != null) { 
     idEstablecimiento = extras.getInt("idEstablecimiento"); 
    } 

    TextView textView = (TextView) this.findViewById(R.id.nombreView); //Declared in fragmentDetail, which has been already inflated at this point, but still null 
    textView.setText(this.idEstablecimiento); 
} 

//... 
//Non related stuff... 
//... 

    public static class PlaceholderFragment extends Fragment { 
    private int idEstablecimiento; 
    public PlaceholderFragment() { 
    } 

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

的問題是，在onCreate（）方法TextView的是空，爲什麼會這樣，如果該片段已被誇大？一旦片段在onCreate（）方法中膨脹後，我不應該能夠訪問IU元素嗎？或者，如果沒有，訪問它的方法是什麼？

來源

2014-04-26 moictab

你必須在Fragment中找到TextView。

public static class PlaceholderFragment extends Fragment { 
private int idEstablecimiento; 
public PlaceholderFragment() { 
} 
public PlaceholderFragment(int idEstablecimiento) { 
this.idEstablecimiento = idEstablecimiento; 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_detail, 
      container, false); 
    TextView text = rootView.findViewById(R.id.nombreView); 
    text.setText(idEstablecimiento); 
    return rootView; 
}

然後你可以得到文本並提交它。

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_detail); 

Bundle extras = getIntent().getExtras(); 
if (extras != null) { 
    idEstablecimiento = extras.getInt("idEstablecimiento"); 
} 

if (savedInstanceState == null) { 
    getFragmentManager().beginTransaction() 
      .add(R.id.container, new PlaceholderFragment(idEstablecimiento)).commit(); 
} 
}

問候尼爾斯

來源

2014-04-26 19:27:05 beefsausage

我認爲這是不超載的片段構造一個好主意：http://stackoverflow.com/questions/11602433/fragment-newinstance-vc-onsaveinstancestate/11602478# 11602478但無論如何非常感謝，非常有用 – moictab

如果你想從一個片段佈局視圖，你應該使用視圖中的片段的oncreateView內，然後得到的OnCreate視圖內TextView的..

例如：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_detail, 
      container, false); 
    TextView textView = (TextView) rootView.this.findViewById(R.id.nombreView); //Declared in fragmentDetail, which has been already inflated at this point, but still null 
textView.setText("I am here"); 
    return rootView; 
}

來源

2014-04-26 19:22:57

訪問查看片段中的元素

回答

相關問題