java - 按钮上的 setText 在 TextView 上工作时不起作用

Question

这是我的 Firebase 数据库结构: enter image description here

我是 Java 的新手，正试图弄清楚如何解决这个问题。所以我正在制作一个测验应用程序，直到现在一切正常，除了我无法从 Firebase 实时数据库检索数据。

我的布局:我有一个 textView 来显示问题4 个按钮显示用户可以选择的选项当用户单击按钮时，按钮颜色会变为红色或绿色，具体取决于问题的答案是否正确。我为计时器添加了一个 textView，它被忽略了

我只能检索问题 textView 的数据，但按钮不显示任何内容

我的问题类:

    package com.example.android.quizapp;
public class Question
{
    public String question,option1,option2,option3,option4,answer;

    public Question(String question,String option1,String option2,String option3,String option4,String answer)
    {
        this.question=question;
        this.option1=option1;
        this.option2=option2;
        this.option3=option3;
        this.option4=option4;
        this.answer=answer;
    }

    public Question()
    {

    }

    public String getQuestion() {
        return question;
    }

    public void setQuestion(String question) {
        this.question = question;
    }

    public String getOption1() {
        return option1;
    }

    public void setOption1(String option1) {
        this.option1 = option1;
    }

    public String getOption2() {
        return option2;
    }

    public void setOption2(String option2) {
        this.option2 = option2;
    }

    public String getOption3() {
        return option3;
    }

    public void setOption3(String option3) {
        this.option3 = option3;
    }

    public String getOption4() {
        return option4;
    }

    public void setOption4(String option4) {
        this.option4 = option4;
    }

    public String getAnswer() {
        return answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }
}

我的问题java Activity 类:

package com.example.android.quizapp;
import android.app.VoiceInteractor;
import android.graphics.Color;
import android.graphics.Path;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

public class questions extends AppCompatActivity
{
    TextView txtquestions,timer;
    Button OptionA,OptionB,OptionC,OptionD;
    int total=0;
    int correct=0;
    int wrong=0;

    DatabaseReference reference;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_questions);

        txtquestions=(TextView)findViewById(R.id.Questions);
        OptionA=(Button)findViewById(R.id.OptionA);
        OptionB=(Button)findViewById(R.id.OptionB);
        OptionC=(Button)findViewById(R.id.OptionC);
        OptionD=(Button)findViewById(R.id.OptionD);
        timer=(TextView)findViewById(R.id.timer);

        updateQuestions();
    }

    private void updateQuestions()
    {
        total++;
        if(total>2)
        {
            //open the result activity
            Toast.makeText(questions.this,"Done",Toast.LENGTH_SHORT).show();
        }
        else
        {
            reference=FirebaseDatabase.getInstance().getReference().child("questions").child(String.valueOf(total));
            reference.addValueEventListener((new ValueEventListener()
            {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot)
                {
                    final Question question=dataSnapshot.getValue(Question.class);
                    txtquestions.setText(question.getQuestion());
                    OptionA.setText(question.getOption1());
                    OptionB.setText(question.getOption2());
                    OptionC.setText(question.getOption3());
                    OptionD.setText(question.getOption4());

                    OptionA.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View v)
                        {
                            if(OptionA.getText().toString().equals(question.getAnswer()))
                            {
                                OptionA.setBackgroundColor(Color.GREEN);
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        correct++;
                                        OptionA.setBackgroundColor(Color.parseColor("#03A9F4"));
                                        updateQuestions();
                                    }
                                },1500);
                            }
                            else
                                {
                                //answer if wrong...we will find the correct answer and make it green
                                    wrong++;
                                    OptionA.setBackgroundColor(Color.RED);
                                    if(OptionB.getText().toString().equals(question.getAnswer()))
                                    {
                                        OptionB.setBackgroundColor(Color.GREEN);
                                    }
                                    else if(OptionC.getText().toString().equals(question.getAnswer()))
                                    {
                                        OptionC.setBackgroundColor(Color.GREEN);
                                    }
                                    else if(OptionD.getText().toString().equals(question.getAnswer()))
                                    {
                                        OptionD.setBackgroundColor(Color.GREEN);
                                    }

                                    //Replace all the colors and update the question
                                    Handler handler=new Handler();
                                    handler.postDelayed(new Runnable()
                                    {
                                        @Override
                                        public void run()
                                        {
                                            OptionA.setBackgroundColor(Color.parseColor("#FDCC12"));
                                            OptionB.setBackgroundColor(Color.parseColor("#FDCC12"));
                                            OptionC.setBackgroundColor(Color.parseColor("#FDCC12"));
                                            OptionD.setBackgroundColor(Color.parseColor("#FDCC12"));
                                            updateQuestions();
                                        }
                                    },1500);
                            }
                        }
                    });

                    OptionB.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View v)
                        {
                            if(OptionB.getText().toString().equals(question.getAnswer()))
                            {
                                OptionB.setBackgroundColor(Color.GREEN);
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        correct++;
                                        OptionB.setBackgroundColor(Color.parseColor("#03A9F4"));
                                        updateQuestions();
                                    }
                                },1500);
                            }
                            else
                            {
                                //answer if wrong...we will find the correct answer and make it green
                                wrong++;
                                OptionB.setBackgroundColor(Color.RED);
                                if(OptionA.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionA.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionC.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionC.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionD.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionD.setBackgroundColor(Color.GREEN);
                                }

                                //Replace all the colors and update the questions
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        OptionA.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionB.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionC.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionD.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        updateQuestions();
                                    }
                                },1500);

                            }
                        }
                    });

                    OptionC.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View v)
                        {
                            if(OptionC.getText().toString().equals(question.getAnswer()))
                            {
                                OptionC.setBackgroundColor(Color.GREEN);
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        correct++;
                                        OptionC.setBackgroundColor(Color.parseColor("#03A9F4"));
                                        updateQuestions();
                                    }
                                },1500);
                            }
                            else
                            {
                                //answer if wrong...we will find the correct answer and make it green
                                wrong++;
                                OptionC.setBackgroundColor(Color.RED);
                                if(OptionA.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionA.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionB.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionB.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionD.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionD.setBackgroundColor(Color.GREEN);
                                }

                                //Replace all the colors and update the questions
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        OptionA.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionB.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionC.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionD.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        updateQuestions();
                                    }
                                },1500);

                            }
                        }
                    });

                    OptionD.setOnClickListener(new View.OnClickListener()
                    {
                        @Override
                        public void onClick(View v)
                        {
                            if(OptionD.getText().toString().equals(question.getAnswer()))
                            {
                                OptionD.setBackgroundColor(Color.GREEN);
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        correct++;
                                        OptionD.setBackgroundColor(Color.parseColor("#03A9F4"));
                                        updateQuestions();
                                    }
                                },1500);
                            }
                            else
                            {
                                //answer if wrong...we will find the correct answer and make it green
                                wrong++;
                                OptionD.setBackgroundColor(Color.RED);
                                if(OptionA.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionA.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionB.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionB.setBackgroundColor(Color.GREEN);
                                }
                                else if(OptionC.getText().toString().equals(question.getAnswer()))
                                {
                                    OptionC.setBackgroundColor(Color.GREEN);
                                }

                                //Replace all the colors and update the questions
                                Handler handler=new Handler();
                                handler.postDelayed(new Runnable()
                                {
                                    @Override
                                    public void run()
                                    {
                                        OptionA.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionB.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionC.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        OptionD.setBackgroundColor(Color.parseColor("#FDCC12"));
                                        updateQuestions();
                                    }
                                },1500);

                            }
                        }
                    });
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError)
                {

                }
            }));
        }
    }
}

我只希望按钮能够显示来自 Firebase 数据库的数据并且颜色能够正常工作，因为现在它们在按下时都会变成红色

问题已解决我只需要将一个 JSON 文件导入我的数据库而不是从 Firebase 数据库创建它

Answer 1

不知道这个问题，但您可以简单地获取字符串中的值，而不是使用字符串变量来设置文本。像那样:

String A, B, C, D;

A = question.getOption1();
B = question.getOption2();
C = question.getOption3();
D = question.getOption4();

OptionA.setText(A);
OptionB.setText(B);
OptionC.setText(C);
OptionD.setText(D);

只是一个建议它会为你工作。