單選按鈕的更改未註冊

Question

我有導航活動由碎片組成。目前，該應用程序可以從radiogroup中選取所選的ID，並通過單擊按鈕將其文本顯示爲敬酒。但應用程序只顯示已檢查的單選按鈕（定義爲xml），如果我更改所選的單選按鈕，它仍將顯示按xml中的定義進行檢查的那個按鈕。這是java類（ FirstFragment.java）

public class FirstFragment extends Fragment implements View.OnClickListener { 

View myView; 

private RadioGroup radioGroup; 
private RadioButton radioButton; 
Button btnDisplay; 
String text; 

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


    btnDisplay = (Button) myView.findViewById(R.id.btnDisplay); 
    btnDisplay.setOnClickListener(this); 

    radioGroup = (RadioGroup) myView.findViewById(R.id.radio); 
    int selectedId = radioGroup.getCheckedRadioButtonId(); 
    radioButton = (RadioButton) myView.findViewById(selectedId); 

    return myView; 
} 

@Override 
public void onClick(View v) { 
    Toast.makeText(getActivity(), 
      text = radioButton.getText().toString(), Toast.LENGTH_SHORT).show(); 
    } 

} 

這是XML文件

<RadioGroup 
     android:id="@+id/radio" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:paddingRight="89dp"> 

     <RadioButton 
      android:id="@+id/radioGram" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="16dp" 
      android:text="Gram"/> 

     <RadioButton 
      android:id="@+id/radioKilogram" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Kilogram" 
      android:textSize="16sp" 
      android:checked="true"/> 

    </RadioGroup> 

因此，在這種情況下，麪包會顯示「公斤」，但如果我檢查「革蘭氏陰性」單選按鈕，麪包仍然會顯示「千克」。有誰能幫助解決這個問題嗎謝謝

Answer 1

試試這個：

private RadioButton rb_1, rb_2; 


//in on createView 
    rb_1 = (RadioButton) myView.findViewById(R.id.radioGram); 
    rb_2 = (RadioButton) myView.findViewById(R.id.radioKilogram); 

    rb_1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Toast.makeText(getActivity(), 
      rb1.getText().toString(), Toast.LENGTH_SHORT).show(); 
      } 
     }); 
     rb_2.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Toast.makeText(getActivity(), 
      rb2.getText().toString(), Toast.LENGTH_SHORT).show(); 
      } 
     }); 

替代辦法：在onCreateView（）你已經initilized MyView的

View myView = inflater.inflate(R.layout.first_layout, container, false); 
RadioGroup radioGroup = (RadioGroup) myView.findViewById(R.id.radio);   
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() 
{ 
    @Override 
    public void onCheckedChanged(RadioGroup group, int checkedId) { 
     // checkedId is the RadioButton selected 
     switch(checkedId){ 
       case R.id.radioGram: 
        // do operations specific to this selection 
        Toast.makeText(getActivity(),"Gram selected", Toast.LENGTH_SHORT).show(); 
        break; 
       case R.id.radioKilogram: 
        // do operations specific to this selection 
        Toast.makeText(getActivity(),"KiloGram selected", Toast.LENGTH_SHORT).show(); 
        break; 
      } 
    } 
}); 

Answer 2

要調用

int selectedId = radioGroup.getCheckedRadioButtonId(); 
    radioButton = (RadioButton) myView.findViewById(selectedId); 

內onCreateView後寫哪隻打一次電話。因爲每次在烤麪包上顯示相同的值。儘量讓裏面的onClick值：

public class FirstFragment extends Fragment implements View.OnClickListener { 

View myView; 

private RadioGroup radioGroup; 
private RadioButton radioButton; 
Button btnDisplay; 
String text; 

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


    btnDisplay = (Button) myView.findViewById(R.id.btnDisplay); 
    btnDisplay.setOnClickListener(this); 

    radioGroup = (RadioGroup) myView.findViewById(R.id.radio); 
    int selectedId = radioGroup.getCheckedRadioButtonId(); 
    radioButton = (RadioButton) myView.findViewById(selectedId); 

    return myView; 
} 

@Override 
public void onClick(View v) { 
    int selectedId = radioGroup.getCheckedRadioButtonId(); 
    radioButton = (RadioButton) myView.findViewById(selectedId); 
    Toast.makeText(getActivity(), 
      text = radioButton.getText().toString(), Toast.LENGTH_SHORT).show(); 
    } 

}