Android旋轉錯誤

Question

我遇到了我的Android應用程序的問題。我有兩個編輯文本和兩個由幾個單選按鈕組成的radiogroups。我有一個帶有碎片的導航抽屜。

當用戶鍵入數字並選擇單選按鈕時，它將該數字更改爲最終數字。但是，當Android設備旋轉到水平狀態時，單選按鈕將重置爲初始選中狀態，並重置edittext值。我希望它使edittext值和單選按鈕保持不變。

public class Fragment1 extends Fragment { 

    public static RadioButton button1a; 
    public static RadioButton button2a; 
    public static RadioButton button3a; 
    public static RadioButton button4a; 
    public static RadioButton button5a; 

    public static RadioButton button1b; 
    public static RadioButton button2b; 
    public static RadioButton button3b; 
    public static RadioButton button4b; 
    public static RadioButton button5b; 

    public static EditText valueinput; 
    public static EditText valueoutput; 

    public static double valueInputvar; 
    public static double valueOutputvar; 

    public static RadioGroup g1, g2; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setRetainInstance(true); 

     if (savedInstanceState != null) { 
      valueinput.setText(savedInstanceState.getString("input")); 
      valueinput.setText(savedInstanceState.getString("output")); 
      g1.check(savedInstanceState.getInt("n1")); 
      g2.check(savedInstanceState.getInt("n2")); 
     } 
    } 

    @Override 
    public void onResume() { 
     super.onResume(); 

    } 

    @Override 
    public void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     outState.putString("input", valueinput.getText().toString()); 
     outState.putString("output", valueoutput.getText().toString()); 
     outState.putInt("n1", g1.getCheckedRadioButtonId()); 
     outState.putInt("n2", g2.getCheckedRadioButtonId()); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View content = inflater.inflate(R.layout.fragment1_layout, container, false); 

     g1 = (RadioGroup) content.findViewById(R.id.radioGroup1); 
     g2 = (RadioGroup) content.findViewById(R.id.radioGroup2); 


     button1a = (RadioButton) content.findViewById(R.id.radio1a); 
     button2a = (RadioButton) content.findViewById(R.id.radio2a); 
     button3a = (RadioButton) content.findViewById(R.id.radio3a); 
     button4a = (RadioButton) content.findViewById(R.id.radio4a); 
     button5a = (RadioButton) content.findViewById(R.id.radio5a); 

     button1b = (RadioButton) content.findViewById(R.id.radio1b); 
     button2b = (RadioButton) content.findViewById(R.id.radio2b); 
     button3b = (RadioButton) content.findViewById(R.id.radio3b); 
     button4b = (RadioButton) content.findViewById(R.id.radio4b); 
     button5b = (RadioButton) content.findViewById(R.id.radio5b); 

     valueinput = (EditText) content.findViewById(R.id.value1); 
     valueoutput = (EditText) content.findViewById(R.id.value2); 

     valueinput.setHint("Enter a number"); 

     valueinput.setText(df.format(1)); 
     valueoutput.setText(df.format(1000)); 

     valueInputvar = Double.parseDouble(valueinput.getText().toString()); 
     valueOutputvar = Double.parseDouble(valueoutput.getText().toString()); 

     valueInputvar = 0; 
     valueOutputvar = 0; 

     }); 


     return content; 
    } 
} 

Answer 1

首先，在您的onCreate一個問題（兩者都是valueinput，這是固定的版本）：

valueinput.setText(savedInstanceState.getString("input")); 
valueoutput.setText(savedInstanceState.getString("output")); 

你需要知道的第二件事是，的onCreate被onCreateView之前稱爲你可以看到here。所以你必須稍微改變你的邏輯。你應該注意到onCreateView也會通過savedInstanceState。檢查它是否爲空，然後初始化默認值。否則從包中獲取值。

Answer 2

使用onSaveInstanceState保存值和onRestoreInstanceState以獲取您輸入的值。 例如：

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 

    outState.putString("value_name", editText1.getText().toString().trim()); 
} 

@Override 
protected void onRestoreInstanceState(Bundle savedInstanceState) { 
    super.onRestoreInstanceState(savedInstanceState); 
    editText1.setText(savedInstanceState.getString("value_name").trim()); 

}