我无法创建共享首选项文件

Question

我无法创建共享首选项文件我一直在为此挣扎2天，请帮助，我是新来的。在我的应用程序中，我有不同的屏幕上有15个问题，我想要存储所选选项的文本，以便将来可以使用它。 我的代码

公共类QuestionPagerFragment扩展片段{

protected View mView; 

String pageData[]; //Stores the text to swipe. 
String optionData[];//Stores the option data. 

static int rid; 
RadioGroup group; 
static ArrayList<Integer> list = new ArrayList(); 

SharedPreferences prefs; 
public static final String MyPREFERENCES = "MyPrefs" ; 


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

@Override 
public void onActivityCreated(@Nullable Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    prefs = getActivity().getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE); 
    pageData=getResources().getStringArray(R.array.desserts); 

    optionData=getResources().getStringArray(R.array.options); 

    group = (RadioGroup)mView.findViewById(R.id.group); 

    group.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(RadioGroup group, int checkedId) { 
      // TODO Auto-generated method stub 
      int radioButtonID = group.getCheckedRadioButtonId(); 
      View radioButton = group.findViewById(radioButtonID); 
      rid = group.indexOfChild(radioButton); 
      list.add(getArguments().getInt("pos"), rid); 
      click(); 

     } 
    }); 
    ((TextView)mView.findViewById(R.id.textMessage)).setText(pageData[getArguments().getInt("pos")]); 
    if(getArguments().getInt("pos") == 14) { 
     ((Button)mView.findViewById(R.id.submitbtn)).setVisibility(View.VISIBLE); 
     ((Button)mView.findViewById(R.id.submitbtn)).setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v){ 

       }     
      }); 
    } 

    for(int i = 0; i < group.getChildCount(); i++){ 
     ((RadioButton) group.getChildAt(i)).setText(optionData[(getArguments().getInt("pos")*4)+i]); 
    }  
} 



public static void save() { 
     if(rid==0){ 
      MainActivity.FLAG_A++;     
     } 
     else if(rid==1){ 
      MainActivity.FLAG_B++;  
     } 
     else if(rid==2){ 
      MainActivity.FLAG_C++;  
     } 
     else if(rid==3){ 
      MainActivity.FLAG_D++;  
     }    
} 
public void click(){ 

     SharedPreferences prefs = getActivity().getSharedPreferences("idValue", 0); 
     SharedPreferences.Editor editor = prefs.edit(); 
     editor.putString("idValue", list.get(getArguments().getInt("pos")).toString()); 
     editor.commit(); 
} 

}

Answer 1

此代码将帮助您存储值

SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", MODE_PRIVATE); 
Editor editor = pref.edit(); 

//存储数据的键/值对

editor.putBoolean("key_name1", true);   // Saving boolean - true/false 
editor.putInt("key_name2", "int value");  // Saving integer 
editor.putFloat("key_name3", "float value"); // Saving float 
editor.putLong("key_name4", "long value");  // Saving long 
editor.putString("key_name5", "string value"); // Saving string 

// Save the changes in SharedPreferences 
editor.commit(); // commit changes 

//获取SharedPreferences数据

//如果key不存在则返回第二个参数值的方式值 - 在这种情况下，空

pref.getBoolean("key_name1", null);   // getting boolean 
pref.getInt("key_name2", null);    // getting Integer 
pref.getFloat("key_name3", null);   // getting Float 
pref.getLong("key_name4", null);   // getting Long 
pref.getString("key_name5", null);   // getting String 

//从SharedPreferences删除键值

editor.remove("key_name3"); // will delete key key_name3 
editor.remove("key_name4"); // will delete key key_name4 

// Save the changes in SharedPreferences 
editor.commit(); // commit changes 

//清除SharedPreferences中的所有数据

editor.clear(); 
editor.commit(); // commit changes 

Answer 2

尝试删除此行： SharedPreferences prefs = getActivity（）。getSharedPreferences（“idValue”，0）;

Answer 3

试图改变提交（）到申请（）是这样的：

public void click(){ 

    SharedPreferences prefs = getActivity().getSharedPreferences("your.project.package.name", 0); // don't use short id because sharedPreferences is a global file 
    SharedPreferences.Editor editor = prefs.edit(); 
    editor.putString("idValue", list.get(getArguments().getInt("pos")).toString()); 

    editor.apply(); //Here is the change 
} 

阅读您的首选项尝试：

SharedPreferences prefs = this.getSharedPreferences("your.project.package.name", Context.MODE_PRIVATE); 
String idValue= prefs.getString("idValue", null);