如何确保至少选中了1个复选框? [英] How to make sure at least 1 checkbox is checked?

问题描述

我正在制作某种测验应用程序，并且我想确保用户选中至少1个复选框.

Hi I am making some sort of quiz application and I want to make sure the user checks at least 1 check box.

我正在创建如下复选框:

I am creating the the check boxes like this:

LinearLayout mLinearLayout = (LinearLayout) findViewById(R.id.linear1);
    arrGroup = new ArrayList<RadioGroup>();
    try
    {

        for (int i = 0; i < question.length ; i++) 
        {
            if(question[i].multichoice == true)
            {               
                TextView title2 = new TextView(this);
                title2.setText(question[i].questionName);
                title2.setTextColor(Color.BLACK);
                mLinearLayout.addView(title2);

                for(int zed = 0; zed < question[i].answers.length; zed++) 
                {               
                    final CheckBox box = new CheckBox(this);
                    box.setText(question[i].answers[zed].answer);
                    box.setId(zed);                     
                    mLinearLayout.addView(box);
                    int flag = 0;
                    if(box.isChecked() == true)
                    {
                        flag = 1;
                    }
                    if(flag == 1)
                    {
                        Toast.makeText(getApplicationContext(), "hi", Toast.LENGTH_SHORT).show();
                    }
                }                   
            }
            else
            {
                 // create text button
                TextView title = new TextView(this);
                title.setText(question[i].questionName);                   
                title.setTextColor(Color.BLACK);
                mLinearLayout.addView(title);

                // create radio button
                final RadioButton[] rb = new   RadioButton[question[i].answers.length];
                RadioGroup radGr = new RadioGroup(this);
                // take a reference of RadioGroup view
                arrGroup.add(radGr);        

                radGr.setOrientation(RadioGroup.VERTICAL);
                radGr.setOnClickListener(new OnClickListener()
                {
                    @Override
                    public void onClick(View v) 
                    {                   
                        checkQuestionsAnswer();
                    }

                });

                for (int j = 0; j < question[i].answers.length; j++) {
                    rb[j] = new RadioButton(this);
                    radGr.addView(rb[j]);
                    rb[j].setText(question[i].answers[j].answer);
                }
                mLinearLayout.addView(radGr);
            }
        }              
    }
    catch(Exception e)
    {
        e.printStackTrace();
    } 

但是我不知道如何确保用户已选中至少1个框.

But I cant figure out how to make sure the user has checked at least 1 box.

推荐答案

在创建复选框时将其添加到列表中.然后使用

Add your checkboxes to a list as you create them. then use the

checkbox.isChecked()

循环执行例程，以确保至少检查了1个.

routine in a loop to make sure at least 1 is checked.

在此处查找复选框API

Look here for the checkbox API

http://developer.android.com/reference/android/widget/CheckBox.html

和此处的列表:

http://developer.android.com/reference/java/util/List.html \

// Added List
List<Checkbox> ansList = new List<Checkbox>();

// YOUR CODE with the list addition
for (int i = 0; i < question.length ; i++){

    if(question[i].multichoice == true){

        TextView title2 = new TextView(this);
        title2.setText(question[i].questionName);
        title2.setTextColor(Color.BLACK);
        mLinearLayout.addView(title2);

        for(int zed = 0; zed < question[i].answers.length; zed++){

            final CheckBox box = new CheckBox(this);
            box.setText(question[i].answers[zed].answer);
            box.setId(zed);

            // Since a test, make sure no answer is checked
            box.setChecked(false);

            // Add the checkbox to YOUR list of boxes
            ansList.add(box);

            mLinearLayout.addView(box);                     

        }
    }
}


// Later you can check with this
boolean atLeastOne = false;
for (int i = 0; i < question.length ; i++){

    if(question[i].multichoice == true){

        for(int zed = 0; zed < question[i].answers.length; zed++){

            if(ansList.get(zed).isChecked()) atLeastOne = true;                    

        }
    }
}

if(true == atLeastOne){
    // Do whatever you want to do if at least one is checked
}

我还没有真正运行或检查过此代码，但这应该可以使您入门，并且应该可以正常工作.

I have NOT actually run or checked this code, but this should get you started, and it SHOULD work.

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