如何在Android中随机排列RadioButtons？

Question

我有一个radioGroup和四个单选按钮，我只是想在程序运行时随机安排这些单选按钮。

说我有单选按钮r1，r2，r3，r4和一个radiogroup。 我希望有时这些按照r2，r3，r1，r4（垂直）排列的单选按钮以及某些时候r1，r2，r4，r3等...

我该如何实现这一点？

Answer 1

为了实现随机RadioButton随机序列下面的代码将帮助您：

在你layout.xml文件中添加RadioGroup：

<RadioGroup 
     android:id="@+id/gul_radio_group" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"/> 

而且在你的java文件：

final int NUMBER_OF_RADIOBUTTONS_TO_ADD = 4;//Change it for other number of RadioButtons 
    RadioButton[] radioButton; 
    RadioGroup radioGroup; 


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

     radioGroup = (RadioGroup) findViewById(R.id.gul_radio_group); 

     //Initializing the RadioButtons 
     radioButton = new RadioButton[NUMBER_OF_RADIOBUTTONS_TO_ADD]; 
     for (int i = 0; i < NUMBER_OF_RADIOBUTTONS_TO_ADD; i++) { 
      radioButton[i] = new RadioButton(this); 

      //Text can be loaded here 
      radioButton[i].setText("Button " + (i + 1)); 
     } 

     //Random Swapping 
     for (int i = 0; i < 4; i++) {//this loop is randomly changing values 4 times 
      int swap_ind1 = ((int) (Math.random() * 10) % NUMBER_OF_RADIOBUTTONS_TO_ADD); 
      int swap_ind2 = ((int) (Math.random() * 10) % NUMBER_OF_RADIOBUTTONS_TO_ADD); 
      RadioButton temp = radioButton[swap_ind1]; 
      radioButton[swap_ind1] = radioButton[swap_ind2]; 
      radioButton[swap_ind2] = temp; 
     } 
     radioButton[0].setChecked(true);//This will make the top RadioButton selected by default 


     //Adding RadioButtons in RadioGroup 
     for (int i = 0; i < NUMBER_OF_RADIOBUTTONS_TO_ADD; i++) { 
      radioGroup.addView(radioButton[i]); 
     } 
    } 

Answer 2

编写一个实现随机函数算法的函数（您可以编写自己的函数或在互联网上找到一个函数 - 它们非常常见和简单）。

然后，使用addView()以编程方式将RadioButton添加到RadioGroup来呈现它们。使用随机函数的结果来确定addView（）函数的“index”参数。

您的随机函数将确保每次单选按钮被渲染时，它们的顺序都是随机的。

UPDATE

为了让事情更清晰，假设你的随机函数返回顺序如下： -

现在，你需要做的是“索引”参数依次调用addView()四次，依次占据上述值。

例如： -

addView(radioButton2); 
addView(radioButton1); 
addView(radioButton4); 
addView(radioButton3); 

Answer 3

解释后的随机交换实现部分：https://stackoverflow.com/a/46252387/6195457

//Random Swapping 
     //This loop iterates the explained process 4 times which is inside it 
     for (int i = 0; i < 4; i++) { 

      /*0,1,2,3 can be output for ((int) (Math.random() * 10) % 4) 
       *Math.random returns a number in between 0 to 1 
       *we multiply it with 10 to make the number from 0 to 10 
       *Taking %4 will return a number from 0 to 3*/ 
      int swap_ind1 = ((int) (Math.random() * 10) % NUMBER_OF_RADIOBUTTONS_TO_ADD); 

      //Getting second random index as above 
      int swap_ind2 = ((int) (Math.random() * 10) % NUMBER_OF_RADIOBUTTONS_TO_ADD); 

      //Swapping the RadioButtons at Random indexes above 
      RadioButton temp = radioButton[swap_ind1];//storing value of first index in temp 
      radioButton[swap_ind1] = radioButton[swap_ind2];//Putting second value at first index 
      radioButton[swap_ind2] = temp;// putting first value at second index from temp 
     }