Android添加視圖到片段並將視圖綁定到適配器

Question

你好，我現在正在使用片段，並且我似乎無法找到解決此問題的方法。到目前爲止：

FragmentReceivingStocksHeader.class

public class FragmentReceivingStocksHeader extends Fragment { 

EditText etVanTransferDocument, etDocumentNumber; 
Spinner spLocationFrom, spLocationTo; 
Button btExit, btProcess; 

ArrayAdapter<String> adapterFrom, adapterTo; 
String[] locationsFromArray, locationsToArray; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 

    initControls(); 

    View rootView = 
      inflater.inflate(R.layout.fragment_receivingstocks_transactionheader, container, false); 
    return rootView; 



} 

private void initControls() { 
    // TODO Auto-generated method stub 
    spLocationFrom = (Spinner) findViewById (R.id.spLocationFrom); 
    spLocationFrom.setEnabled(false); 
    spLocationTo = (Spinner) findViewById (R.id.spLocationTo); 
    spLocationTo.setEnabled(false); 

    locationsFromArray = getResources().getStringArray(R.array.locations); 
    locationsToArray = getResources().getStringArray(R.array.locationsto); 

    adapterFrom = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_dropdown_item, locationsFromArray); 
    adapterTo = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_dropdown_item, locationsToArray); 

    spLocationFrom.setAdapter(adapterFrom); 

    spLocationFrom.setSelection(1); 

    spLocationTo.setAdapter(adapterTo); 
    spLocationTo.setSelection(0); 
} 

但我在這一行錯誤：

spLocationFrom = (Spinner) findViewById (R.id.spLocationFrom); 

錯誤消息：

The method findViewById(int) is undefined for the type FragmentReceivingStocksHeader 

以及這些行：

adapterFrom = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_dropdown_item, locationsFromArray); 
    adapterTo = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_dropdown_item, locationsToArray); 

錯誤消息：

The constructor ArrayAdapter<String>(FragmentReceivingStocksHeader, int, String[]) is undefined 

什麼我這裏做錯了嗎？我需要你的幫助。謝謝。

Answer 1

在你initControls方法，進行以下修改：

spLocationFrom = (Spinner) view.findViewById (R.id.spLocationFrom); 
spLocationTo = (Spinner) view.findViewById (R.id.spLocationTo); 

和

adapterFrom = new ArrayAdapter<String>(getActivity(), 
     android.R.layout.simple_spinner_dropdown_item, locationsFromArray); 
adapterTo = new ArrayAdapter<String>(getActivity(), 
     android.R.layout.simple_spinner_dropdown_item, locationsToArray); 

說明：findViewById不片段可用就像它在Activity中一樣，所以你需要使用View.findViewById方法。 而構造函數或ArrayAdapter接受一個上下文作爲第一個參數，所以活動工作，但不是片段。

Answer 2

問題是，片段類沒有類似findViewById的方法，就像Activity一樣。你需要使用你的充氣rootView.findViewById。

至於您的適配器，類似地，構造函數不接受Fragment類型，但Context。 Activity類延伸Context，您可以使用getActivity()方法從Fragment訪問您的活動。

看到你的代碼如下更新：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 


    View rootView = 
      inflater.inflate(R.layout.fragment_receivingstocks_transactionheader, container, false); 
    initControls(rootView); 
    return rootView; 



} 

private void initControls(View view) { 
    // TODO Auto-generated method stub 
    spLocationFrom = (Spinner) view.findViewById (R.id.spLocationFrom); 
    spLocationFrom.setEnabled(false); 
    spLocationTo = (Spinner) view.findViewById (R.id.spLocationTo); 
    spLocationTo.setEnabled(false); 

    locationsFromArray = getResources().getStringArray(R.array.locations); 
    locationsToArray = getResources().getStringArray(R.array.locationsto); 

    adapterFrom = new ArrayAdapter<String>(getActivity(), 
     android.R.layout.simple_spinner_dropdown_item, locationsFromArray); 
    adapterTo = new ArrayAdapter<String>(getActivity(), 
     android.R.layout.simple_spinner_dropdown_item, locationsToArray); 

    spLocationFrom.setAdapter(adapterFrom); 

    spLocationFrom.setSelection(1); 

    spLocationTo.setAdapter(adapterTo); 
    spLocationTo.setSelection(0); 
}