返回从对话片段字符串返回到活动 [英] Returning String from Dialog Fragment back to Activity

问题描述

我看过这么多的职位，但我找不到任何适用于这种情况。

我有一个时间选择器对话框，我已经把整数值一起在一个字符串，我需要得到这个字符串返回到的主要活动。

这个字符串值将被用于设置按钮上的文字。

如果有人可以帮助我这个这将是最AP preciated。

感谢您

对话片段

 公共类TimePickerFragment扩展DialogFragment实现TimePickerDialog.OnTimeSetListener {
    @覆盖
    公共对话onCreateDialog（包savedInstanceState）{
        //使用当前时间作为选择器的默认值
        最后的日历C = Calendar.getInstance（）;
        INT小时= c.get（Calendar.HOUR_OF_DAY）;
        INT分钟= c.get（Calendar.MINUTE）;

        //创建TimePickerDialog的新实例，并将其返回
        返回新TimePickerDialog（getActivity（），这一点，小时，分钟，DateFormat.is24HourFormat（getActivity（）））;
    }

    公共无效onTimeSet（TimePicker观点，诠释hourOfDay，INT分钟）{
        //做一些与用户所选择的时间
        字符串时间= Integer.toString（hourOfDay）+：+ Integer.toString（分钟）;
    }
}
 

code

  @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_second）;


        按钮BTN =（按钮）findViewById（R.id.start_time_button）;
        Button.setText（时间）;


    }
 

解决方案

在preferred方法是使用一个回调函数来获得从片段的信号。此外，这是建议的Andr​​oid推荐的方法在与活动沟通

有关你的榜样，在你的 DialogFragment ，添加一个接口和注册。

 公共静态接口OnCompleteListener {
    公共抽象无效的onComplete（字符串时）;
}

私人OnCompleteListener mListener;

//确保活动实现了它
公共无效onAttach（活动活动）{
    super.onAttach（活动）
    尝试 {
        this.mListener =（OnCompleteListener）的活动;
    }
    赶上（最终ClassCastException异常E）{
        抛出新ClassCastException异常（activity.toString（）+必须实现OnCompleteListener）;
    }
}
 

现在在你的活动实现这个的接口的

 公共类MyActivity扩展活动实现MyDialogFragment.OnCompleteListener {
    // ...

    公共无效的onComplete（字符串时）{
        //对话片段完成后，它会调用这个回调。
        //这里使用字符串
    }
}
 

现在在你的 DialogFragment ，当用户单击OK按钮，发送值回活动通过回调。

 公共无效onTimeSet（TimePicker观点，诠释hourOfDay，INT分钟）{
    字符串时间= Integer.toString（hourOfDay）+：+ Integer.toString（分钟）;
    this.mListener.onComplete（时间）;
}
 

I have read many posts on this but I can't find any that apply to this case.

I have a time picker dialog and I have put the integer values together in a string and I need to get this string back to the main activity.

This string value will then be used to set the text of a button.

If someone could help me with this it would be most appreciated.

Thank you

Dialog Fragment

public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);

        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, hour, minute, DateFormat.is24HourFormat(getActivity()));
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user
        String Time =Integer.toString(hourOfDay) + " : " + Integer.toString(minute);
    }
}

Code

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);


        Button btn = (Button) findViewById(R.id.start_time_button);
        Button.setText(Time);


    }

解决方案

The preferred method is to use a callback to get a signal from a Fragment. Also, this is the recommended method proposed by Android at Communicating with the Activity

For your example, in your DialogFragment, add an interface and register it.

public static interface OnCompleteListener {
    public abstract void onComplete(String time);
}

private OnCompleteListener mListener;

// make sure the Activity implemented it
public void onAttach(Activity activity) {
    super.onAttach(activity) 
    try {
        this.mListener = (OnCompleteListener)activity;
    }
    catch (final ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement OnCompleteListener");
    }
}

Now implement this interface in your Activity

public class MyActivity extends Activity implements MyDialogFragment.OnCompleteListener {
    //...

    public void onComplete(String time) {
        // After the dialog fragment completes, it calls this callback.
        // use the string here
    }
}

Now in your DialogFragment, when a user clicks the OK button, send that value back to the Activity via your callback.

public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
    String time = Integer.toString(hourOfDay) + " : " + Integer.toString(minute);
    this.mListener.onComplete(time);
}

这篇关于返回从对话片段字符串返回到活动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！