Question

我的代码中没有错误，但它不会显示我希望它显示的随机字符串。我希望片段在每次加载时都有不同的字符串。我改变了我的问题.java。

question.java

       import android.content.Context;
       import android.content.res.Resources;
       import android.net.Uri;
       import android.util.Log;
       import android.os.Bundle;
       import android.support.v4.app.Fragment;
       import android.view.LayoutInflater;
       import android.view.View;
       import android.view.ViewGroup;
       import android.widget.TextView;




        import java.util.Random;


        public class question extends Fragment {




      private static final String TAG = MainActivity.class.getSimpleName();

       private OnFragmentInteractionListener mListener;
       //public randomQuestion t1 = new randomQuestion();

      private String[] myQuestions;
       private static final Random random = new Random();
        private TextView question;




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




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


    TextView question = (TextView)getView().findViewById(R.id.question);
    EditText answere = (EditText)getView().findViewById(R.id.enterTxt);

    Resources res = getResources();
    myQuestions = res.getStringArray(R.array.myQuestions);
    String q = myQuestions[new Random().nextInt(myQuestions.length)];
    question.setText(q);


}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_question, container, false);
   // return inflater.inflate(R.layout.fragment_question, container, false);
    question = (TextView) rootView.findViewById(R.id.question);
    question.setText(myQuestions[random.nextInt(myQuestions.length)]);
    return rootView;
}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
    if (mListener != null) {
        mListener.onFragmentInteraction(uri);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    if (context instanceof OnFragmentInteractionListener) {
        mListener = (OnFragmentInteractionListener) context;
    } else {
        throw new RuntimeException(context.toString()
                + " must implement OnFragmentInteractionListener");
    }

}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}


public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(Uri uri);
     }
  }

array.xml

  <?xml version="1.0" encoding="utf-8"?>
    <resources>
    <string-array name="myQuestions">
       <item> String 1</item>
       <item>String 2</item>
       <item>String 3</item>
       <item> String 4</item>
       <item> String 5</item>
     </string-array>
   </resources>

当我打开片段时，它会出现在logcat中，它会变成红色。

06-13 10：50：53.653 13733-13784 / com.theneworange.lock E / Surface：getSlotFromBufferLocked：unknown buffer：0xaa971570

的strings.xml

     <resources>
    <string name="app_name">"App "</string>
    <string name="turn_on">Turn On</string>
    <string name="turn_off">Turn Off</string>
    <string name="to_turn_on_press_turn_on_button">To turn on press Turn On        button</string>
    <string name="to_turn_off_press_turn_off_button">To turn off press Turn     Off button</string>

<string-array name="myQuestions">
    <item> String 1</item>
    <item>String 2</item>
    <item>String 3</item>
    <item> String 4</item>
    <item> String 5</item>
</string-array>

Answer 1

需要将此行移动到onCreateView中，因为没有View可以获得类级别。

TextView question = (TextView)getView().findViewById(R.id.question);

所以，修复字段。像这样的东西

private String[] myQuestions;
private static final Random random = new Random();
private TextView question;

然后，

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_question, container, false);
    question = (TextView) rootView.findViewById(R.id.question);
    question.setText(myQuestions[random.nextInt(myQuestions.length)];
    return rootView;
}

随机生成器显示字符串

1 个答案: