Android旋转错误

Question

我遇到了我的Android应用程序的问题。我有两个编辑文本和两个由几个单选按钮组成的radiogroups。我有一个带有碎片的导航抽屉。

当用户键入数字并选择单选按钮时，它将该数字更改为最终数字。但是，当Android设备旋转到水平状态时，单选按钮将重置为初始选中状态，并重置edittext值。我希望它使edittext值和单选按钮保持不变。

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一个问题（两者都是valueinput，这是固定的版本）：

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之前称为你可以看到here。所以你必须稍微改变你的逻辑。你应该注意到onCreateView也会通过savedInstanceState。检查它是否为空，然后初始化默认值。否则从包中获取值。

Answer 2

使用onSaveInstanceState保存值和onRestoreInstanceState以获取您输入的值。 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()); 

}