Question

我正在学习android并创建一个问答游戏。在游戏中有不同级别的新手，简单，中等，硬，有一部分我必须生成随机算术数学问题，我已设法做到这似乎有点像20 + 7,20-3,10 * 2,20 / 2（所有这些都是在游戏中随机的。）我需要帮助将游戏限制为最多十个问题。

任何帮助都会很棒。谢谢

以下是我的游戏类代码。

  package com.example.quiz2;

 import java.util.Random;
 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.ImageView;
 import android.widget.TextView;


public class Play extends Activity implements OnClickListener {



//gameplay elements
private int level = 0, answer = 0, operator = 0, operand1 = 0, operand2 = 0,operand3= 0, operand4 = 0,operand5 = 0, operand6 = 0;
//operator constants
private final int ADD_OPERATOR = 0, SUBTRACT_OPERATOR = 1, MULTIPLY_OPERATOR = 2,
        DIVIDE_OPERATOR = 3;
//operator text
private String[] operators = {"+", "-", "x", "/"};
//min and max for each level and operator
private int[][] levelMin = {
        {1, 13, 21,28},
        {1, 6, 12,16},
        {2, 8, 13,18},
        {2, 4, 7,12}};
private int[][] levelMax = {
        {10, 25, 45,85},
        {10, 20, 55,90},
        {5, 10, 15,25},
        {10, 50, 100,200}};
//random number generator
private Random random;
//ui elements
private TextView question, answerTxt;
private ImageView response;



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

    //text 
    question = (TextView)findViewById(R.id.question);
    answerTxt = (TextView)findViewById(R.id.answer);
    response = (ImageView)findViewById(R.id.response);

    //hide tick cross initially
    response.setVisibility(View.INVISIBLE);



    //number, enter and delete buttons 


      View btn1 = findViewById(R.id.btn1);//finding button with id
      btn1.setOnClickListener(this);//listening for clicks
      View btn2 = findViewById(R.id.btn2);
      btn2.setOnClickListener(this);
      View btn3 = findViewById(R.id.btn3);
      btn3.setOnClickListener(this);
      View btn4 = findViewById(R.id.btn4);
      btn4.setOnClickListener(this);
      View btn5 = findViewById(R.id.btn5);
      btn5.setOnClickListener(this);
      View btn6 = findViewById(R.id.btn6);
      btn6.setOnClickListener(this);
      View btn7 = findViewById(R.id.btn7);
      btn7.setOnClickListener(this);
      View btn8 = findViewById(R.id.btn8);
      btn8.setOnClickListener(this);
      View btn9 = findViewById(R.id.btn9);
      btn9.setOnClickListener(this);
      View btn0 = findViewById(R.id.btn0);
      btn0.setOnClickListener(this);
      View enter = findViewById(R.id.enter);
      enter.setOnClickListener(this); 
      View del = findViewById(R.id.del);
      del.setOnClickListener(this);




    //get passed level number
    Bundle extras = getIntent().getExtras();
    if(extras !=null)
    {
        int passedLevel = extras.getInt("level", -1);
        if(passedLevel>=0) level = passedLevel;
    }

    //initialize random
    random = new Random();
    //play
    chooseQuestion();
}

@Override
public void onClick(View view) {
    if(view.getId()==R.id.enter){
        //enter button
        //get answer
        String answerContent = answerTxt.getText().toString();
        //check we have an answer
        if(!answerContent.endsWith("?")){
            //get number
            int enteredAnswer = Integer.parseInt(answerContent.substring(2));


            //check answer
            if(enteredAnswer==answer){
                //correct

                response.setImageResource(R.drawable.correct);
                response.setVisibility(View.VISIBLE);
            }
            else{
                //incorrect

                response.setImageResource(R.drawable.wrong);
                response.setVisibility(View.VISIBLE);
            }
            chooseQuestion();
        }
    }
    else if(view.getId()==R.id.del){
        //clear button
        answerTxt.setText("=");
    }
    else {
        //number button
        response.setVisibility(View.INVISIBLE);
        //get number from tag
        int enteredNum = Integer.parseInt(view.getTag().toString());
        //either first or subsequent digit
        if(answerTxt.getText().toString().endsWith("?"))
            answerTxt.setText("= "+enteredNum);
        else
            answerTxt.append(""+enteredNum);
    }
}



//method generates questions
private void chooseQuestion(){
    //reset answer text
    answerTxt.setText("= ?");
    //choose operator
    operator = random.nextInt(operators.length);
    //choose operands
    operand1 = getOperand();
    operand2 = getOperand();
    operand3 = getOperand();
    operand4 = getOperand();
    operand5 = getOperand();



    //checks for operators
    if(operator==SUBTRACT_OPERATOR){
        //no negative answers
        while(operand2>operand1){
            operand1 = getOperand();
            operand2 = getOperand();
        }
    }
    else if(operator==DIVIDE_OPERATOR){
        //whole numbers only
        while((((double)operand1/(double)operand2)%1 > 0) 
                || (operand1==operand2)){
            operand1 = getOperand();
            operand2 = getOperand();
        }
    }

    //calculate answer
    switch(operator){
    case ADD_OPERATOR:
        answer = operand1+operand2-operand3;
        break;
    case SUBTRACT_OPERATOR:
        answer = operand1-operand2+operand3;
        break;
    case MULTIPLY_OPERATOR:
        answer = operand1*operand2;
        break;
    case DIVIDE_OPERATOR:
        answer = operand1/operand2;
        break;
    default:
        break;
    }

    //show question
    question.setText(operand1+" "+operators[operator]+" "+operand3+operators[operator]+" "+operand4);
}

//method generates operands
private int getOperand(){
    return random.nextInt(levelMax[operator][level] - levelMin[operator][level] + 1) 
            + levelMin[operator][level];
}

}

Answer 1

您可以使用java.random通过使用nextint方法将整数设置为随机数

http://developer.android.com/reference/java/util/Random.html

Android-在测验游戏中随机生成

1 个答案: