片段中的Android RadioButtons

Question

我正在關注單選按鈕教程，並希望在片段中創建一些RadioGroups與RadioButtons。我定義的onClick方法，但如果我點擊單選按鈕有一個錯誤：

java.lang.IllegalStateException: Could not find method FirstQuestion(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatRadioButton with id 'test1from10question1answerA' 
                       at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:325) 
                       at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284) 
                       at android.view.View.performClick(View.java:4438) 
                       at android.widget.CompoundButton.performClick(CompoundButton.java:100) 
                       at android.view.View$PerformClick.run(View.java:18422) 
                       at android.os.Handler.handleCallback(Handler.java:733) 
                       at android.os.Handler.dispatchMessage(Handler.java:95) 
                       at android.os.Looper.loop(Looper.java:136) 
                       at android.app.ActivityThread.main(ActivityThread.java:5045) 
                       at java.lang.reflect.Method.invokeNative(Native Method) 
                       at java.lang.reflect.Method.invoke(Method.java:515) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
                       at dalvik.system.NativeStart.main(Native Method) 

我的XML文件是：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.plan.aplikacjamobilna.registerTestFragments.question1from10" 
    android:layout_marginLeft="20dp" 
    android:layout_marginRight="20dp" 
    android:orientation="vertical"> 

    <!-- TODO: Update blank fragment layout --> 
    <RadioGroup 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="20dp" 
     android:layout_gravity="center_horizontal"> 

     <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="1:"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="A" 
     android:id="@+id/test1from10question1answerA" 
     android:onClick="FirstQuestion"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="B" 
     android:id="@+id/test1from10question1answerB" 
     android:onClick="FirstQuestion"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="C" 
     android:id="@+id/test1from10question1answerC" 
     android:onClick="FirstQuestion"/> 
    </RadioGroup> 

    <RadioGroup 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="20dp" 
     android:layout_gravity="center_horizontal"> 
     <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="2:"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="A" 
     android:id="@+id/test1from10question2answerA" 
     android:onClick="SecondQuestion"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="B" 
     android:id="@+id/test1from10question2answerB" 
     android:onClick="SecondQuestion"/> 
     <RadioButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="C" 
     android:id="@+id/test1from10question2answerC" 
     android:onClick="SecondQuestion"/> 
    </RadioGroup> 

    <RadioGroup 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="20dp" 
     android:layout_gravity="center_horizontal"> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="3:"/> 
     <RadioButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="A" 
      android:id="@+id/test1from10question3answerA" 
      android:onClick="ThirdQuestion"/> 
     <RadioButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="B" 
      android:id="@+id/test1from10question3answerB" 
      android:onClick="ThirdQuestion"/> 
     <RadioButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="C" 
      android:id="@+id/test1from10question3answerC" 
      android:onClick="ThirdQuestion"/> 
    </RadioGroup> 

</LinearLayout> 

和代碼片段：

public class question1from10 extends Fragment { 

    public question1from10() { 
    // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_question1from10, container, false); 
    } 

    public void FirstQuestion(View view) { 

    boolean checked = ((RadioButton) view).isChecked(); 
    switch(view.getId()){ 

     case R.id.test1from10question1answerA: 
     Toast.makeText(getActivity(), "A", Toast.LENGTH_LONG).show(); 

     case R.id.test1from10question1answerB: 
     Toast.makeText(getActivity(), "B", Toast.LENGTH_LONG).show(); 

     case R.id.test1from10question1answerC: 
     Toast.makeText(getActivity(), "C", Toast.LENGTH_LONG).show(); 
    } 
    } 
} 

是有一些問題與RadioButtons在片段或我的代碼是不正確的？

Answer 1

當您在XML中使用標記時，Android將只會在您當前的Activity中查找指定的onClick方法。它沒有看任何片段。

最簡單的選項是以編程方式指定onClick。

public class question1from10 extends Fragment implements View.OnClickListener { 

    public question1from10() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     // Inflate the layout for this fragment 
     View rootView = inflater.inflate(R.layout.fragment_question1from10, container, false); 

     // Set the onClick for each of our views as the one implemented by this Fragment 
     rootView.findViewById(R.id.test1from10question1answerA).setOnClickListener(this); 
     rootView.findViewById(R.id.test1from10question1answerB).setOnClickListener(this); 
     rootView.findViewById(R.id.test1from10question1answerC).setOnClickListener(this); 
     ... 

     return rootView; 
    } 

    @Override 
    public void onClick(View view) { 

     boolean checked = ((RadioButton) view).isChecked(); 
     switch(view.getId()){ 

      case R.id.test1from10question1answerA: 
       Toast.makeText(getActivity(), "A", Toast.LENGTH_LONG).show(); 

      case R.id.test1from10question1answerB: 
       Toast.makeText(getActivity(), "B", Toast.LENGTH_LONG).show(); 

      case R.id.test1from10question1answerC: 
       Toast.makeText(getActivity(), "C", Toast.LENGTH_LONG).show(); 
     } 
    } 
}