我的回收是 Bugging It 当项目数据未显示在屏幕上时无法更改 仅当按钮单击时在屏幕上显示的项目会更改 [关闭]

问：

它没有改变顶部

This is my Adapter

软件包 com.csucat.reviewer.Adapter;

导入 android.content.Context;

导入 android.view.LayoutInflater;

导入android.view.View;

导入 android.view.ViewGroup;

导入 android.widget.Button;

导入 android.widget.EditText;

导入 android.widget.ImageView;

导入 android.widget.TextView;

导入 android.widget.Toast;

导入 androidx.annotation.NonNull;

导入androidx.recyclerview.widget.RecyclerView;

导入 com.csucat.reviewer.R;

导入 com.csucat.reviewer.datalist;

导入 com.google.android.material.textfield.TextInputEditText;

导入 java.util.ArrayList;

公共类 rvAdapter 扩展了 RecyclerView.Adapter<rvAdapter.MyViewHolder> {

public rvAdapter（ArrayList datalists， Context context） {

this.datalists = datalists;


this.context = context;

}

ArrayList 数据列表;

上下文上下文;

@NonNull

@Override

公共 rvAdapter.MyViewHolder onCreateViewHolder（@NonNull ViewGroup 父级，int viewType） {

View itemview =


    LayoutInflater.from(parent.getContext()).inflate(R.layout.item_questionaire, parent, false);


return new MyViewHolder(itemview);

}

@Override

public void onBindViewHolder（@NonNull rvAdapter.MyViewHolder holder， int position） {

datalist i = datalists.get(position);


holder.Question.setText(i.getQuestion());


holder.A.setText("A: " + i.getChoiceA());


holder.B.setText("B: " + i.getChoiceB());


holder.C.setText("C: " + i.getChoiceC());


holder.D.setText("D: " + i.getChoiceD());


holder.etAnswer.setText(i.getUserInput());

}

@Override

公共 int getItemCount（） {

return datalists.size();

}

公共类 MyViewHolder 扩展 RecyclerView.ViewHolder {

private TextView Question;


private TextView A;


private TextView B;


private TextView C;


private TextView D;


private TextView tvIsCorrect;


private TextInputEditText etAnswer;





public MyViewHolder(@NonNull View view) {


  super(view);


  Question = view.findViewById(R.id.tvQuestion);


  A = view.findViewById(R.id.tvA);


  B = view.findViewById(R.id.tvB);


  C = view.findViewById(R.id.tvC);


  D = view.findViewById(R.id.tvD);


  etAnswer = view.findViewById(R.id.etAnswer);


  tvIsCorrect = view.findViewById(R.id.trueans);


}





public TextInputEditText getEtAnswer() {


  return this.etAnswer;


}





public TextView gettvIsCorrect() {


  return this.tvIsCorrect;


}








public void setEtAnswer(TextInputEditText etAnswer) {


  this.etAnswer = etAnswer;


}

}

}

This is My ReviewerActivity

软件包 com.csucat.reviewer.Activities;

导入android.graphics.Bitmap;

导入 android.text.TextUtils;

导入 com.csucat.reviewer.Adapter.rvAdapter;

导入 android.os.Bundle;

导入 android.util.Log;

导入 android.widget.Button;

导入 android.widget.EditText;

导入 android.widget.TextView;

导入 android.widget.Toast;

导入android.view.View;

导入 android.graphics.Color;

导入androidx.appcompat.app;

导入androidx.recyclerview.widget.DefaultItemAnimator;

导入androidx.recyclerview.widget.LinearLayoutManager;

导入androidx.recyclerview.widget.RecyclerView;

导入 com.csucat.reviewer.Adapter.rvAdapter;

导入 com.csucat.reviewer.R;

导入 com.csucat.reviewer.datalist;

导入 org.json.JSONArray;

导入org.json.JSONObject;

导入 java.io.BufferedReader;

导入java.io.File;

导入 java.io.FileInputStream;

导入 java.io.InputStream;

导入 java.io.InputStreamReader;

导入 java.io.Reader;

导入 java.lang.reflect.Array;

导入 java.util.ArrayList;

public class ReviewerActivity extends AppCompatActivity {

private Button submit;

private RecyclerView rv;

private rvAdapter rvAdapter;

private ArrayList<datalist> datalists;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.layout_reviewer);

    

   setRecyCler();



    

    



    submit = findViewById(R.id.submit);

    submit.setOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View view) {

        // Iterate through your RecyclerView items and perform the logic

        checkAllAnswers();

    }

});





      

}







private void importData() {

    datalists = new ArrayList<>();



    try {

        for (int i = 0; i < getdataquiz().length(); i++) {

            JSONObject obj = getdataquiz().getJSONObject(i);

            String question = obj.getString("Question");

            String ChoiceA = obj.getString("a");

            String ChoiceB = obj.getString("b");

            String ChoiceC = obj.getString("c");

            String ChoiceD = obj.getString("d");

            String Answer = obj.getString("answer");

            datalists.add(new datalist(question, ChoiceA, ChoiceB, ChoiceC, ChoiceD, Answer));

        }

    } catch (Exception e) {

        // Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();

        e.printStackTrace();

    }

}

private void setRecyCler(){

    importData();

    rv = findViewById(R.id.rv);

    rvAdapter = new rvAdapter(datalists, this);

    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());

    rv.setLayoutManager(layoutManager);

    rv.setAdapter(rvAdapter);

    rvAdapter.notifyDataSetChanged();



}

protected String readStream(InputStream in)

{

    StringBuilder sb = new StringBuilder();

    try {

        Reader reader = new BufferedReader(new InputStreamReader(in));

        char[] buff = new char[1024];

        while (true) {

            int read = reader.read(buff, 0, buff.length);

            if (read <= 0) {

                break;

            }

            sb.append(buff, 0, read);

        }

    } catch (Exception e) {

    }

    return sb.toString();

}

protected JSONObject getJSONObject()

{

    try {

        InputStream inputStream = this.getAssets().open("data.json");

        String json = readStream(inputStream).trim();

        return new JSONObject(json);

    } catch (Exception e) {

        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();

    }

    return null;

}

public JSONArray getdataquiz() {

    try {

        if (getJSONObject() != null) {

            JSONArray array = getJSONObject().getJSONArray("Data");

            return array;

        }

    } catch (Exception e) {

        e.printStackTrace();

    }

    return null;

}

私有 void checkAllAnswers（） {

for (int i = 0; i < rvAdapter.getItemCount(); i++) {

    rvAdapter.MyViewHolder holder = (rvAdapter.MyViewHolder) rv.findViewHolderForAdapterPosition(i);

    if (holder != null) {

        datalist item = datalists.get(i);

        String userAnswer = holder.getEtAnswer().getText().toString();

        TextView truans = holder.gettvIsCorrect();

        if (TextUtils.isEmpty(userAnswer)) {

            showToast("Fill up all fields");

            truans.setVisibility(View.GONE);

        } else {

            truans.setVisibility(View.VISIBLE);

            if (userAnswer.equalsIgnoreCase(item.getAnswer())) {

                // Correct answer

                truans.setTextColor(Color.GREEN);

                truans.setText("Correct");

            } else {

                // Wrong answer

                truans.setTextColor(Color.RED);

                truans.setText("Wrong");

            }

        }

    }

}

}

private void showToast(String message) {

    Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();

}

}