显示数组的值

Question

我一直在尝试这个测验一段时间，但是我很努力地将问题与答案匹配。

以下行和其他应该显示答案的行实际显示“[[ljava.lang.string; @ 40585b18”和轻微变化。

quesAns4.setText("4) " + answers[3]) ; 

我曾试图改变现在上面的一行：

quesAns4.setText("4) " + answers[0][3]); 

很明显，我想问题的答案和方法符合上述仅从阵列

{"3","5","8","9"} 

所以显示8基本上是对我想要他们匹配的每个问题的改变。如果问题是“在几秒钟内，以300公里/小时的速度行驶F1车辆需要多长时间？”可能显示的答案应该是4,6,8,10等。

任何帮助/指导，将不胜感激谢谢。

Full code below！

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.TextView; 



public class MathsMultiplicationActivity extends Activity { 


TextView quesnum; 
TextView ques; 
TextView anst; 
TextView ans1; 
TextView ans2; 
TextView ans3; 
TextView ans4; 
ImageView cross; 
ImageView tick; 
Button nxt; 

    int qno = 1; 
    int right_answers = 0; 
    int wrong_answers = 0; 
    int rnd1; 
    int rnd2; 

    String [] questions = {"How much mph does the F-Duct add to the car?", 
       "What car part is considered the biggest performance variable?", 
       "What car part is designed to speed up air flow at the car rear?", 
       "In seconds, how long does it take for a F1 car to stop when travelling at 300km/h?", 
       "How many litres of air does an F1 car consume per second?", 
       "What car part can heavily influence oversteer and understeer?", 
       "A third of the cars downforce can come from what?", 
       "Around how much race fuel would be consumed per 100km?","The first high nose cone was introduced when?", 
       "An increase in what, has led to the length of exhaust pipes being shortened drastically?"}; 

    String [] [] answers = {{"3","5","8","9"}, 
    {"Tyres","Front Wing","F-Duct","Engine"}, 
    {"Diffuser","Suspension","Tyres","Exhaust"}, 
    {"4","6","8","10"}, 
    {"650","10","75","450"}, 
    {"Suspension","Tyres","Cockpit","Chassis"}, 
    {"Rear Wing","Nose Cone","Chassis","Engine"}, 
    {"75 Litres","100 Litres","50 Litres","25 Litres"}, 
    {"1990","1989","1993","1992"}, 
    {"Engine RPM","Nose Cone Lengths","Tyre Size","Number of Races"}}; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.multiplechoice); 

    // Importing all assets like buttons, text fields 
    quesnum = (TextView) findViewById(R.id.questionNum); 
    ques = (TextView) findViewById(R.id.question); 
    anst = (TextView) findViewById(R.id.answertit); 
    ans1 = (TextView) findViewById(R.id.answer1); 
    ans2 = (TextView) findViewById(R.id.answer2); 
    ans3 = (TextView) findViewById(R.id.answer3); 
    ans4 = (TextView) findViewById(R.id.answer4); 
    nxt = (Button) findViewById(R.id.btnNext); 
    cross = (ImageView) findViewById(R.id.cross); 
    tick = (ImageView) findViewById(R.id.tick); 

    cross.setVisibility(View.GONE); 
    tick.setVisibility(View.GONE); 


    quesnum.setText("Question: " + qno + "/10"); 


    final Button buttonAbout = (Button) findViewById(R.id.btnNext); 
    buttonAbout.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
     next(); 
     } 

     private void next() { 
      qno++; 
      change_question(); 
     } 

     private void change_question() { 
      if(tick.getVisibility() == View.VISIBLE){ 
       right_answers++; 
      } 

      if(cross.getVisibility() == View.VISIBLE){ 
       wrong_answers++; 
      } 
      if(qno==questions.length){ 

      }else{ 
       cross.setVisibility(View.GONE); 
       tick.setVisibility(View.GONE); 
       rnd1 = (int)Math.ceil(Math.random()*3); 
       rnd2 = (int)Math.ceil(Math.random()*questions.length)-1; 
       ques.setText(questions[rnd2]); 
       if(questions[rnd2]=="x") 
       { 
        change_question(); 
       } 
      } 
      questions[rnd2]="x"; 




      if(rnd1==1){ 
       TextView quesAns1 = (TextView) findViewById(R.id.answer1); 
       quesAns1.setText("1) " + answers[0]) ;    

       TextView quesAns2 = (TextView) findViewById(R.id.answer2); 
       quesAns2.setText("2) " + answers[1]) ; 

       TextView quesAns3 = (TextView) findViewById(R.id.answer3); 
       quesAns3.setText("3) " + answers[2]) ; 

       TextView quesAns4 = (TextView) findViewById(R.id.answer4); 
       quesAns4.setText("4) " + answers[3]) ; 
      } 

      if(rnd1==2){ 
       TextView quesAns1 = (TextView) findViewById(R.id.answer1); 
       quesAns1.setText("1) " + answers[2]) ;    

       TextView quesAns2 = (TextView) findViewById(R.id.answer2); 
       quesAns2.setText("2) " + answers[0]) ; 

       TextView quesAns3 = (TextView) findViewById(R.id.answer3); 
       quesAns3.setText("3) " + answers[1]) ; 

       TextView quesAns4 = (TextView) findViewById(R.id.answer4); 
       quesAns4.setText("4) " + answers[3]) ; 
      } 
      if(rnd1==3){ 
       TextView quesAns1 = (TextView) findViewById(R.id.answer1); 
       quesAns1.setText("1) " + answers[1]) ;    

       TextView quesAns2 = (TextView) findViewById(R.id.answer2); 
       quesAns2.setText("2) " + answers[2]) ; 

       TextView quesAns3 = (TextView) findViewById(R.id.answer3); 
       quesAns3.setText("3) " + answers[0]) ; 

       TextView quesAns4 = (TextView) findViewById(R.id.answer4); 
       quesAns4.setText("4) " + answers[3]) ; 
      } 

     } 


    }); 


    //Answer 1 click functions 
    ans1.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View view) { 
      ans1Action(); 
     } 

     private void ans1Action() { 
      //enable_disable(0); 
      if(rnd1==1){ 
       tick.setVisibility(View.VISIBLE); 
      }else{ 
       cross.setVisibility(View.VISIBLE); 
      } 

     } 

    }); 


    //Answer 2 click functions 
    ans2.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View view) { 
      ans2Action(); 
     } 

     private void ans2Action() { 
      //enable_disable(0); 
      if(rnd1==2){ 
       tick.setVisibility(View.VISIBLE); 
      }else{ 
       cross.setVisibility(View.VISIBLE); 
      } 

     } 

    }); 


    //Answer 3 click functions 
    ans3.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View view) { 
      ans3Action(); 
     } 

     private void ans3Action() { 
      //enable_disable(0); 
      if(rnd1==3){ 
       tick.setVisibility(View.VISIBLE); 
      }else{ 
       cross.setVisibility(View.VISIBLE); 
      } 

     } 

    }); 

    //Answer 4 click functions 
    ans4.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View view) { 
      ans4Action(); 
     } 

     private void ans4Action() { 
      //enable_disable(0); 
      if(rnd1==4){ 
       tick.setVisibility(View.VISIBLE); 
      }else{ 
       cross.setVisibility(View.VISIBLE); 
      } 

     } 

    }); 
} 



} 

Answer 1

此：

quesAns4.setText("4) " + answers[0][3]); 

工作，如果这是第一个问题。

你应该做的是在change_question功能在参数问题的数量change_question(int questionNumber)

然后，当你设置的文本，可以使用：

quesAns4.setText("4) " + answers[questionNumber][3]); 

如果你的问题在开始0. 否则，您使用：

quesAns4.setText("1) " + answers[questionNumber-1][0]); 
quesAns4.setText("2) " + answers[questionNumber-1][1]); 
quesAns4.setText("3) " + answers[questionNumber-1][2]); 
quesAns4.setText("4) " + answers[questionNumber-1][3]); 

Answer 2

要在用户友好的方式打印数组，你需要遍历数组的项目，或者您可以使用Arrays.deepToString method：

String yourPrinterFriendlyArray = Arrays.deepToString(answers[0]); 
quesAns4.setText("4) " + yourPrinterFriendlyArray);