在Android中，当我通过编程调用设置一个单选按钮没有被触发一个RadioGroup中的onCheckedChanged setChecked（真） [英] In android, onCheckedChanged of a Radiogroup is not triggered when I Programmatically set a Radiobutton by call setChecked(true)

问题描述

在我的应用程序，我需要以编程方式设置一个单选按钮，并期待着radioGroup中的onCheckedChanged被触发，这样我可以在里面做一些事情。

In my application, I need to programmatically set a radiobutton and expect the onCheckedChanged of a Radiogroup to be triggered so that I can do something in it.

code编程设置一个单选按钮。

Code to set a radiobutton programmatically.

 LayoutInflater inflater = LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
 View view = inflater.inflate(R.layout.footer, null);
 RadioButton btn = (RadioButton)view.findViewById(R.id.footer_btn_course);
 btn.setChecked(true);

而在另一个活动，我不喜欢的东西：

And in another activity, I did something like:

 public class MainActivity extends ActivityGroup implements RadioGroup.OnCheckedChangeListener{
      protected void onCreate(Bundle savedInstanceState){
            mRadioGroup = (RadioGroup)findViewById(R.id.footer_radio);
            mRadioGroup.setOnCheckedChangeListener(this);
      }

      @Override
      public void onCheckedChanged(RadioGroup group, int checkedId){
            RadioButton btn = (RadioButton)findViewById(checkedId);
            if(btn != null){
                  do_something();
            }
      }
  }

不过，看起来像这样不工作，onCheckedChanged从未被调用。任何人都知道我应该怎么办呢？谢谢你。

However, looks like this way doesn't work, the onCheckedChanged was never called. Anyone know what I should do? Thanks.

推荐答案

我不知道对于这个问题，但它可能是你错过参考收音机组ID。
试试这个，看看效果（内你的的onCreate（））

I am not sure for the issue, but it may be you miss refer your radio group id. Try this instead to see the effect (inside your onCreate()):

RadioGroup rdGroup = (RadioGroup) findViewById(R.id.footer_radio);
    rdGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
    {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) 
        {
            RadioButton btn = (RadioButton)findViewById(checkedId);
            if(btn != null){
                  do_something();
            }
        }
    });

，也可以是（单选）findViewById（checkedId）返回null。

尝试微调如果你的情况变得模棱两可。

Try Spinner if your case gets ambiguous.

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