Question

我尝试实现RadioGroup视图并将其放在DialogFragment中，但出了点问题。我已经按照本教程

了

http://developer.android.com/guide/topics/ui/controls/radiobutton.html

而是Activity，view在DialogFragment中初始化：

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();
}

}

的xml：

<?xml version="1.0" encoding="utf-8"?>

<RadioGroup
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/radio_group" >

    <RadioButton
        android:id="@+id/radio1"
        android:text="20" />

    <RadioButton
        android:id="@+id/radio2"
        android:text="40" />

    <RadioButton
        android:id="@+id/radio3"
        android:text="60" />

    <RadioButton
        android:id="@+id/radio4"
        android:text="80" />
</RadioGroup>

onRadioButtonClicked监听器它以与教程相同的方式实现。现在，当启动对话框时，如果我点击radiobutton，我会收到此错误：

09-27 09:41:08.018: E/AndroidRuntime(7447): FATAL EXCEPTION: main
09-27 09:41:08.018: E/AndroidRuntime(7447): java.lang.IllegalStateException: Could not
 find a method onRadioButtonClicked(View) in the activity class 
android.view.ContextThemeWrapper for onClick handler on view class 
android.widget.RadioButton with id 'radio1'

怎么了？

Answer 1

我宁愿在片段内部实现click处理程序并动态添加侦听器（通过java而不是XML）。所以我会做这样的事情：

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){
    [...]
}

Answer 2

问题是如果你为xml文件中的任何View指定了onClick回调属性，它应该位于Activity代码内，而不是代码片段

Answer 3

您需要将侦听器与无线电组链接，您可以这样做

@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;
}

Answer 4

为您的片段实现RadioButton.OnCheckedChangeListener。根据你的单选按钮setOnCheckedChangeListener。

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();
}

BTW删除片段中的onRadioButtonClicked（）和＆＃34; android：onClick =＆＃34; onRadioButtonClicked＆＃34;＆＃34;按照http://developer.android.com/guide/topics/ui/controls/radiobutton.html

中的说明操作xml中的RadioButton

Answer 5

也许我有点晚了，但发现了这个解决方案。适用于 API 23

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()
    }
}

YourViewModel.kt

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 -> {}
        }
    }
}

DialogFragment中的RadioButton侦听器

5 个答案: