如何保存多個RadioGroups偏好，而不用重複使用代碼

Question

我有以下代碼：

@Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_settings);  

     final RadioGroup rg_numberOfQuestions = (RadioGroup) findViewById(R.id.radioGroupQuestions); 
     int defaultValue = rg_numberOfQuestions.getId(); 
     RadioButton rbtn = ((RadioButton) rg_numberOfQuestions.findViewById(getPref(defaultValue, "NQ"))); 
     if(rbtn!=null) 
      rbtn.setChecked(true); 
     rg_numberOfQuestions.setOnCheckedChangeListener(this); 

     final RadioGroup rg_numbersBetween = (RadioGroup) findViewById(R.id.radioGroupNumbersBetween); 
     int defaultValue1 = rg_numbersBetween.getId(); 
     RadioButton rbtn1 = ((RadioButton) rg_numbersBetween.findViewById(getPref(defaultValue1, "NB"))); 
     if(rbtn1!=null) 
      rbtn1.setChecked(true); 
     rg_numbersBetween.setOnCheckedChangeListener(this);  
    } 

正如你可以看到有一種相同的代碼重複兩次，這是這一部分：

int defaultValue = rg_numberOfQuestions.getId(); 
     RadioButton rbtn = ((RadioButton) rg_numberOfQuestions.findViewById(getPref(defaultValue, "NQ"))); 
     if(rbtn!=null) 
      rbtn.setChecked(true); 
     rg_numberOfQuestions.setOnCheckedChangeListener(this); 

即使上面的代碼工作正常我的問題是否有更好的方式做到這一點？因爲這似乎是我重複的代碼，並且作爲新開發者不能找出任何其他方式來做這件事。

Answer 1

您可以實現此方法：

selectSavedRadioButton(RadioGroup group, String savedButtonPreferencesKey) { 
    RadioButton button = (RadioButton) group.findViewById(getPref(group.getId(), preferencesKey)); 
    if (button != null) { 
     button.setChecked(true); 
    } 
} 

，你可以這樣調用：

RadioGroup rg_numberOfQuestions = (RadioGroup) findViewById(R.id.radioGroupQuestions); 
selectSavedRadioButton(rg_numberOfQuestions, "NQ");