如何使用共享偏好片段活動

Question

我面臨的一個問題，而我在一個片段中使用此代碼，我做了一些你help..But的一些變化還是有一些錯誤..

這是我想從正常活動中轉移到一個片段活性的代碼..

public class MainActivity extends Activity { 

final static String SHARED_NAME_STRING="sharedp"; 
final static String USER_NAME_STRING="user"; 

Button button; 
EditText editText; 

SharedPreferences sharedPreferences; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    editText=(EditText) findViewById(R.id.userNameEditText); 
    button=(Button) findViewById(R.id.enterButton); 

    Log.d("DICTIONARY", "main activity started"); 


    sharedPreferences=getSharedPreferences(SHARED_NAME_STRING, MODE_PRIVATE); 
    String userNameString=sharedPreferences.getString(USER_NAME_STRING, ""); 

    editText.setText(userNameString); 

    button.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      String string=editText.getText().toString(); 
      Intent intent=new Intent(MainActivity.this, DictionaryListActivity.class); 
      intent.putExtra("user", string); 

      SharedPreferences.Editor editor=sharedPreferences.edit(); 
      editor.putString(USER_NAME_STRING, string); 
      editor.commit(); 

      startActivity(intent); 

     } 
    }); 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

它示出錯誤等MODE_PRIVATE無法解析爲一個變量。所以我改變了Context.MODE_PRIVATE，然後它顯示「editText =（EditText）findViewById（R.id.userNameEditText）;」行上無法訪問的代碼;

如何修復它？

THIS IS MY片段現在看起來喜歡：

public class FragmentA extends Fragment { 

final static String SHARED_NAME_STRING="sharedp"; 
final static String USER_NAME_STRING="user"; 

Button button; 
EditText editText; 
Context c; 

SharedPreferences sharedPreferences; 


public FragmentA() { 
    // Required empty public constructor 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_a, container, false); 
    editText=(EditText) getView().findViewById(R.id.userNameEditText); 
    button=(Button) getView().findViewById(R.id.enterButton); 

    Log.d("DICTIONARY", "main activity started"); 

    Context c =getActivity(); 
    sharedPreferences=this.c.getSharedPreferences(SHARED_NAME_STRING,MODE_PRIVATE); 
    String userNameString=sharedPreferences.getString(USER_NAME_STRING, ""); 

    editText.setText(userNameString); 

    button.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      String string=editText.getText().toString(); 
      Intent intent=new Intent("android.intent.action.JJJJ"); 
      intent.putExtra("user", string); 

      SharedPreferences.Editor editor=sharedPreferences.edit(); 
      editor.putString(USER_NAME_STRING, string); 
      editor.commit(); 

      startActivity(intent); 

     } 
    }); 
} 



} 

Answer 1

簡單，更換

getSharedPreferences(SHARED_NAME_STRING,Context.MODE_PRIVATE); 

Answer 2

你爲什麼在這段代碼有return：

return inflater.inflate(R.layout.fragment_a, container, false); 

建議代碼：

// Inflate the layout for this fragment 
View view = inflater.inflate(R.layout.fragment_a, container, false); 
editText= (EditText) view.findViewById(R.id.userNameEditText); 
... 
return view; 
} 

注：

• 通知的return關鍵字被去除。這導致的

可達代碼你的編譯錯誤就行了....

• 相反的getView()，現在你可以使用view。
• 你應該返回一個View類型的對象。因此，在方法onCreateView

好運結束代碼return view;和樂趣......