Android 对话框片段中的RadioButton侦听器

我试图实现RadioGroup视图并将其放入DialogFragment中，但出现了一些问题。我已经学习了这个教程

但视图是在DialogFragment中初始化的，而不是活动：

public class MenuDialog extends DialogFragment {

    public MenuDialog(){}

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.menu_layout, container);
        this.getDialog().setTitle("title");
        return view;
    }

public void onRadioButtonClicked(View view) {
    boolean checked = ((RadioButton) view).isChecked();
    switch(view.getId()) {
    case R.id.radio1:
        if(checked) {
            Log.i("MENU", ((RadioButton)view).getText());
        }
        break;
    case R.id.radio2:
        if(checked) {
            Log.i("MENU", ((RadioButton)view).getText());
        }
        break;
    case R.id.radio3:
        if(checked) {
            Log.i("MENU", ((RadioButton)view).getText());
        }
        break;
    case R.id.radio4:
        if(checked) {
            Log.i("MENU", ((RadioButton)view).getText());
        }
        break;
    }
    this.getDialog().dismiss();
}

}

xml:

---

怎么了？

问题是，如果您在xml文件中为任何

视图

指定回调属性，它应该位于

活动

代码中，而不是片段代码中

我宁愿在片段中实现click处理程序并动态添加侦听器（通过java而不是xml）。 所以我会这样做：

public class MenuDialog extends DialogFragment implements OnClickListener{
[...]    
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.menu_layout, container);
    view.findViewById(R.id.radio1).setOnClickListener(this);
    view.findViewById(R.id.radio2).setOnClickListener(this);
    //and so on [...]
    this.getDialog().setTitle("title");
    return view;
}

@Override
public void onClick(View v){
    [...]
}

---

你需要把听众和广播组联系起来，你可以这样做

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.menu_layout, container);
    this.getDialog().setTitle("title");
    view.findViewById(R.id.radio_group).setOnCheckedChangeListener(...);
    return view;
}

---

为片段实现RadioButton.OnCheckedChangeListener。根据单选按钮设置CheckedChangeListener

public class MenuDialog extends DialogFragment implements RadioButton.OnCheckedChangeListener{

//..

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.menu_layout, container);
    this.getDialog().setTitle("title");

    ((RadioButton)view.findViewById(R.id.radio1)).setOnCheckedChangeListener(this);
    ((RadioButton)view.findViewById(R.id.radio2)).setOnCheckedChangeListener(this);
    // and so on

    return view;
}

@Override
public void onCheckedChanged(CompoundButton v, boolean checked) {
    switch(v.getId()) {
        case R.id.radio1: 
            // todo
            break;
        case R.id.radio2: 
            // todo
            break;
        // and so on.. 
    }
    this.getDialog().dismiss();
}

---

顺便说一句，请删除片段中的onRadioButtonClicked（），并在您按照

的说明操作时，为xml中的RadioButton删除“android:onClick=“onRadioButtonClicked””，可能我有点晚了，但发现了此解决方案。API 23的工程

YourDialogFragment.kt

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return requireActivity().let {
        AlertDialog.Builder(it)
            .setTitle("Your title here")
            .setSingleChoiceItems(
               R.array.answersStringAray, // resource in res/values/arrays.xml
               1, // value of choosed item in array above 
               clickListener // Implements DialogInterface.OnClickListener
            )
            .setNegativeButton(R.string.cancel, clickListener)
            .create()
    }
}

class YourViewModel : ViewModel(), DialogInterface.OnClickListener {

    override fun onClick(dialog: DialogInterface?, which: Int) {
        when (which) {
            DialogInterface.BUTTON_POSITIVE -> {}
            DialogInterface.BUTTON_NEGATIVE -> {}
            DialogInterface.BUTTON_NEUTRAL -> {}
            0 -> {} // all your answers would be non-negative
            1 -> {}
        }
    }
}

YourViewModel.kt

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return requireActivity().let {
        AlertDialog.Builder(it)
            .setTitle("Your title here")
            .setSingleChoiceItems(
               R.array.answersStringAray, // resource in res/values/arrays.xml
               1, // value of choosed item in array above 
               clickListener // Implements DialogInterface.OnClickListener
            )
            .setNegativeButton(R.string.cancel, clickListener)
            .create()
    }
}

class YourViewModel : ViewModel(), DialogInterface.OnClickListener {

    override fun onClick(dialog: DialogInterface?, which: Int) {
        when (which) {
            DialogInterface.BUTTON_POSITIVE -> {}
            DialogInterface.BUTTON_NEGATIVE -> {}
            DialogInterface.BUTTON_NEUTRAL -> {}
            0 -> {} // all your answers would be non-negative
            1 -> {}
        }
    }
}

---

那么监听器是如何实现的，问题是找不到监听器，发布您的监听器和xml pleasepost，用缺少的代码修改，所以我需要修改onCreateView代码并手动添加监听器？如果您想直接从片段将onClick回调与视图关联，那么，是的，您应该从片段的

onCreateView（）

设置OnClickListener，或者使用OnCheckedChangeListener代替OnClickListener

class YourViewModel : ViewModel(), DialogInterface.OnClickListener {

    override fun onClick(dialog: DialogInterface?, which: Int) {
        when (which) {
            DialogInterface.BUTTON_POSITIVE -> {}
            DialogInterface.BUTTON_NEGATIVE -> {}
            DialogInterface.BUTTON_NEUTRAL -> {}
            0 -> {} // all your answers would be non-negative
            1 -> {}
        }
    }
}