Android的单选按钮，不选中 [英] Android radio button uncheck

问题描述

该应用程序是用每组8个按钮16单选按钮组一个步进音序器应用程序。它完美的作品，除了一次组有选择的，我不能把它关掉，除非我用清晰的按钮，我创建了以清除所有radiogroups一个按钮。我想补充一些code，说当一个选定的单选按钮会再次选择它只是关闭就像一个开关。我试着用切换但其他问题出现与该方法。下面是两次尝试但都只是阻止我使用按钮

 最后RadioGroup中radioGroup1 =（RadioGroup中）findViewById（R.id.RadioGroup1）;
     单选D1 =（单选）findViewById（R.id.RadioButtonD1）;     按钮D1 =（按钮）findViewById（R.id.RadioButtonD1）;
    D1.setOnClickListener（新View.OnClickListener（）{        @覆盖
        公共无效的onClick（视图v）{
            PdBase.sendFloat（D1，74）;
            INT selectedTypeId = radioGroup1.getCheckedRadioButtonId（）;
            单选D1 =（单选）findViewById（selectedTypeId）;
            如果（D1！= NULL）//如果没有一个单选按钮被选中这将是空
                   radioGroup1.clearCheck（）;
            PdBase.sendFloat（D1，0）;
        }
    }）;单选lC1的=（单选）findViewById（R.id.RadioButtonlowC1）;
        lC1.setOnClickListener（新View.OnClickListener（）{            公共无效的onClick（视图v）{                 INT selectedTypeId = radioGroup1.getCheckedRadioButtonId（）;                单选lC1的=（单选）findViewById（R.id.RadioButtonlowC1）;
                如果（selectedTypeId == -1）{
                PdBase.sendFloat（lC1的，72）;
                }
                否则，如果（selectedTypeId == R.id.RadioButtonlowC1）{
                       radioGroup1.clearCheck（）;
                        PdBase.sendFloat（lC1的，0）;                }
            }
        }）;
 

解决方案

最近我同样需要 - 有显示所选的项目可以通过再次点击它被取消单选按钮组。我发现我无法做到，使用监听器，但我的已的能够使用自定义做单选，像这样...

 公共类ToggleableRadioButton扩展单选{
    //实施必要的构造    @覆盖
    公共无效切换（）{
        如果（器isChecked（））{
            如果（的getParent（）的instanceof RadioGroup中）{
                （（RadioGroup中）的getParent（））clearCheck（）;
            }
        }其他{
            setChecked（真）;
        }
    }
}
 

注意，按钮切换不同的方式取决于其当前状态 - 即调用 setChecked（真）按钮与调用 clearCheck（）上的组。如果 setChecked（）在这两种情况时，刚取消，不能立即重新选择一个按钮 - 在逻辑 RadioGroup中似乎立即取消选择。

要使用此按钮，只需更换你的＆LT;具有＆LT 标签; your.package.ToggleableRadioButton＆GT; 在布局XML。

The application is a step sequencer application with 16 radio groups with 8 buttons in each group. It works perfectly except once a group has a button selected I cant turn it off unless I use the clear button I have created to clear all radiogroups. What I would like to add is some code that says when a selected radio button is selected again it simply turns off like a toggle. I tried using toggles but then other issues arose with that method. Below are two attempts but both simply stops me using the button

     final RadioGroup radioGroup1 = (RadioGroup)findViewById(R.id.RadioGroup1);
     RadioButton D1 = (RadioButton)findViewById(R.id.RadioButtonD1);

     Button D1 = (Button)findViewById(R.id.RadioButtonD1);
    D1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            PdBase.sendFloat("D1", 74);
            int selectedTypeId = radioGroup1.getCheckedRadioButtonId();
            RadioButton D1 = (RadioButton) findViewById(selectedTypeId);
            if(D1 != null) // This will be null if none of the radio buttons are selected
                   radioGroup1.clearCheck(); 
            PdBase.sendFloat("D1", 0);
        }
    });

RadioButton lC1 = (RadioButton)findViewById(R.id.RadioButtonlowC1);
        lC1.setOnClickListener(new View.OnClickListener() {



            public void onClick(View v) {

                 int selectedTypeId = radioGroup1.getCheckedRadioButtonId();

                RadioButton lC1 = (RadioButton) findViewById(R.id.RadioButtonlowC1);
                if (selectedTypeId == -1){
                PdBase.sendFloat("lC1", 72);
                }
                else if (selectedTypeId == R.id.RadioButtonlowC1) {
                       radioGroup1.clearCheck(); 
                        PdBase.sendFloat("lC1", 0);

                }
            }   
        });

解决方案

I recently had the same need - to have a radio group where the selected item could be deselected by tapping it again. I found that I couldn't accomplish that using listeners but I was able to do it using a custom RadioButton, like so...

public class ToggleableRadioButton extends RadioButton {
    // Implement necessary constructors

    @Override
    public void toggle() {
        if(isChecked()) {
            if(getParent() instanceof RadioGroup) {
                ((RadioGroup)getParent()).clearCheck();
            }
        } else {
            setChecked(true);
        }
    }
}

Notice that the button is toggled in different ways depending on its current state - i.e., calling setChecked(true) on the button vs. calling clearCheck() on the group. If setChecked() is used in both cases, a button that was just deselected cannot be immediately re-selected - the logic in RadioGroup seems to immediately deselect it.

To use this button, just replace your <RadioButton> tags with <your.package.ToggleableRadioButton> in your layout XML.

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