Android RadioButtons in Fragment

Question

I am following Radio Buttons tutorial and want to create some RadioGroups with RadioButtons in fragment. I defined onClick method but if I click on RadioButton there is an error:

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)

my xml file is:

<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>

and code from fragment:

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();
    }
  }
}

Is there some problem with RadioButtons in fragment or my code is incorrect?

Answer 1

When you use the android:onClick tag in your XML, Android will only look in your current Activity for the specified onClick method. It does not look in any fragments.

The simplest option is to assign the onClick programmatically.

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();
        }
    }
}