Android

Question

我想know/learn如何启用按钮when/if选中单选按钮

完成的步骤

我创建了一个片段并在一个单选组中，其中有 3 个单选按钮

目标

我的主要目标是在选中单选按钮时启用该按钮，并在取消选中该单选按钮时禁用它

代码

到目前为止我有这个代码

public class Operations extends Fragment
{
    RadioButton surfArea, rad, diam;
    RadioGroup radG;
    Button openSelect;

    public Operations()
    {
        // Required empty public constructor
    }

    public static Operations newInstance()
    {
        return new Operations();
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container,
                             Bundle savedInstanceState)
    {
        View rootView = inflater.inflate(R.layout.fragment_operations_sphere, container, false);

        surfArea = (RadioButton) rootView.findViewById(R.id.RB_surfArea);
        rad = (RadioButton) rootView.findViewById(R.id.RB_Rad);
        diam = (RadioButton) rootView.findViewById(R.id.RB_Diam);
        openSelect = (Button) rootView.findViewById(R.id.btn_open_select);

        radG = (RadioGroup) rootView.findViewById(R.id.RG_group);

        openSelect.setEnabled(false);

        openSelect.setOnClickListener(new View.OnClickListener()
        { //This piece of code is for testing purposes
            @Override
            public void onClick(View v)
            {
                if (surfArea.isChecked())
                {
                    openSelect.setEnabled(true); //I detected my mistake here, so I would like to know a better way to achieve this
                    Intent sa = new Intent(getContext(), OperSphere.class);
                    startActivity(sa);
                }
            }
        });

        return rootView;
    }

    @Override
    public void onResume()
    { //Here the radio button unchecks
        radG.clearCheck();
        super.onResume();
    }
}

问题

选中单选按钮时如何启用按钮？

一些例子会很棒

提前致谢

Answer 1

对不起我的错，在这里试试这个解决方案；

由于您使用的是 RadioGroup，因此请在此设置侦听器以相应地禁用或启用按钮。

RadioGroup radG = (RadioGroup) findViewById(R.id.yourRadioGroup);        
radG.setOnCheckedChangeListener(new OnCheckedChangeListener() 
{
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // checkedId is the RadioButton selected
        switch(checkedId) 
        {
        case R.id.surfArea:     
        //enable or disable button
        break;

        case R.id.rad: 
        //enable or disable button        
        break;

        case R.id.diam:  
        //enable or disable button       
        break;
        }
    }
});

Answer 2

只需使用以下代码段：

  @Override
        public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {

            switch (checkedId) {
                case R.id.RB_surfArea:
                   // here set button enable/disable to true / false
                    break;
                case R.id.RB_Rad:
                     // here set button enable/disable to true / false
                    break;
                case R.id.RB_Diam:
                     // here set button enable/disable to true / false
                    break;
            }
        }

Answer 3

您可以像其他人建议的那样在单选按钮上设置一个侦听器，然后使用您创建的功能打开和关闭单选按钮。

radG.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        if (checkedId == R.id.radioButtonId) {
            toggleCheck();
        }
    }
});

其中 toggleCheck() 可以是这样的：

if (radG.isChecked()) {
    radG.clearCheck();
    button.setEnabled(false);
} else {
    radG.select();
    button.setEnabled(true);
}

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