如何在CodenameOne中创建动态单选按钮 [英] How to create dynamic radiobuttons in CodenameOne

问题描述

使用CodenameOne，我根据数据库表上的记录数创建了一个RadioButtons数组。

 容器searchDisplayContainer = findMyContainer（f）; 
 
 for（int i = 0; i< records.length; i ++）{
 RadioButton rdb = new RadioButton（）; 
 
 rdb.setName（ rdb + i）; 
 
 rdb.setText（ rdb + i）; 
 
 rdb.setGroup（ locations）; 
 
 searchDisplayContainer.addComponent（rdb）; 
} 
  

使用此代码，模拟器屏幕上将显示许多RadioButton。 / p>

我的问题是显示单选按钮后，我无法检查选择了哪个按钮。

通常我可以创建

  RadioButton rdb1 = findRadioButton（f）;然后在theme.res中调用单选按钮。 
  

并检查是否已使用if（rdb1.isSelected）

$ b $选择了按钮b

但是，由于我最初不是在theme.res中创建单选按钮，所以不能使用 findRadioButton（f）方法。

我的问题是如何在代码内创建多个RadioButton，然后在按下提交按钮后能够检查是否选中了它们？

---

问题修改

 包用户类； 
 
导入生成。StateMachineBase; 
 import com.codename1.ui。*; 
 import com.codename1.ui.events。*; 
 import com.codename1.ui.util.Resources; 
 
 / ** 
 * 
 * @author在这里您的名字
 * / 
公共类StateMachine扩展StateMachineBase {
 
私有容器searchDisplayContainer; 
 private final int recordLength = 5; 
 private ButtonGroup bg = new ButtonGroup（）; 
 private RadioButton [] rdbs = new RadioButton [recordLength]; 
 
 public StateMachine（String resFile）{
 super（resFile）; 
} 
 
 / ** 
 *此方法应用于初始化变量而不是
 *构造函数/类范围，以避免出现竞争情况
 * / 
保护无效initVars（资源res）{
} 
 
 @Override 
保护无效beforeMain（Form f）{
 searchDisplayContainer = findContainer1（f） ; 
 
 for（int i = 0; i  rdbs [i] .setName（ rdb + i）; 
 rdbs [i] .setText（ rdb + i）; 
 //添加到按钮组
 bg.add（rdbs [i]）; 
 //添加到容器
 searchDisplayContainer.addComponent（rdbs [i]）; 
 
 
} 
} 
 @Override 
 protected void onMain_ButtonAction（Component c，ActionEvent event）{
 System.out.println（bg .getSelectedIndex（））; 
} 
} 
  

解决方案

您需要创建 ButtonGroup 类的实例并向其添加单选按钮，以便将其与组中的其他按钮相关联。

Using CodenameOne, I created an array of RadioButtons based on the count of records on a database table.

Container searchDisplayContainer = findMyContainer(f);

for(int i=0; i < records.length; i++) {
    RadioButton rdb = new RadioButton();

    rdb.setName("rdb"+i);

    rdb.setText("rdb"+i);

    rdb.setGroup("locations"); 

    searchDisplayContainer.addComponent(rdb);
}

With this code, a number of RadioButtons are displayed on the simulator screen.

My problem is that after displaying the radiobuttons, I cannot check which one is selected.

Usually I can create the radiobutton in the theme.res and call it in the code with:

RadioButton rdb1 = findRadioButton(f);  

and check if the button is selected with if(rdb1.isSelected)

However since I am not creating my radio buttons initially in the theme.res, I cannot use the findRadioButton(f) method.

My question is how do I create a number of RadioButtons within the code and then be able to check if they are selected after the submit button is pressed?

---

Question Modification

package userclasses;

import generated.StateMachineBase;
import com.codename1.ui.*; 
import com.codename1.ui.events.*;
import com.codename1.ui.util.Resources;

/**
*
* @author Your name here
*/
public class StateMachine extends StateMachineBase {

    private Container searchDisplayContainer;
    private final int recordLength = 5;
    private ButtonGroup bg = new ButtonGroup();
    private RadioButton[] rdbs = new RadioButton[recordLength];

    public StateMachine(String resFile) {
        super(resFile);
    }

    /**
     * this method should be used to initialize variables instead of
     * the constructor/class scope to avoid race conditions
     */
    protected void initVars(Resources res) {
    }

    @Override
    protected void beforeMain(Form f) {
        searchDisplayContainer = findContainer1(f);

        for(int i=0;i<recordLength;i++){
            rdbs[i].setName("rdb"+i);
            rdbs[i].setText("rdb"+i);
            //add to button group
             bg.add(rdbs[i]);    
             //add to container
            searchDisplayContainer.addComponent(rdbs[i]);


        }
    }
    @Override
    protected void onMain_ButtonAction(Component c, ActionEvent event) {
        System.out.println(bg.getSelectedIndex());
    }
   }

解决方案

You need to create an instance of the ButtonGroup class and add the radio buttons to it in order to associate it to the other buttons in the group.

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