Android 使用dialogfragment从日期选择器获取日期

我正在使用google示例，使用dialogfragment在我的应用程序中插入一个日期选择器

但我不确定设置日期后如何获取日期（不是java专家）。对话框和日期选择器运行正常，我可以记录正确设置的日期，但如何才能在父活动上执行回调

这是我的对话片段

public class DatePickerFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        **Log.w("DatePicker","Date = " + year);**
    }
}

…我从我的活动中调用dialog与

public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");
}

在我的父活动中调用方法而不是Log.w的正确方法是什么？我想这与作为参数传递回调有关，但我在internet上找到的大多数引用都是关于以前没有对话框片段的版本

编辑：不确定是否重要，但父活动声明为：

public class EditSessionActivity extends FragmentActivity {

解决方案：多亏了Lecho用户，这才是解决问题的方法

DatePickerFragmentt.class

public class DatePickerFragment extends DialogFragment{

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);
    }

}

…和父活动EditSessionActivity.class

public class EditSessionActivity extends FragmentActivity implements OnDateSetListener {
...
    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {
        //do some stuff for example write on log and update TextField on activity
        Log.w("DatePicker","Date = " + year);
        ((EditText) findViewById(R.id.tf_date)).setText("Date = " + year);
    }

---

DatePickerDialog的构造函数将DatePickerDialog.OnDateSetListener作为第二个参数，因此您可能应该在父活动

EditSessionActivity

（不在

DatePickerFragment

中）中实现该接口，并更改此行：

return new DatePickerDialog(getActivity(), this, year, month, day);

为此：

return new DatePickerDialog(getActivity(), (EditSessionActivity)getActivity(), year, month, day);

然后您的活动应该如下所示：

public class EditSessionActivity extends FragmentActivity implements
        DatePickerDialog.OnDateSetListener{

    public void onDateSet(DatePicker view, int year, int month, int day) {
        //use date in your activity
    }
    ...
}

---

我在显示日期选择器的类中的日期选择器创建中简单重写onDateSet。 见下面的代码：

  private OnClickListener onDateClicked() {
    return new OnClickListener() {
          @Override
          public void onClick(View v) {
             DialogFragment newFragment = new DatePickerFragment() {
                @Override
                public void onDateSet(DatePicker view, int year, int month, int day) {
                  salePaymentCustomView.setBtDateText("" + day + "/" + month+1 + "/" + year);
                }
             };
             newFragment.show(getActivity().getSupportFragmentManager(), "datePicker");
    }
  };
 } 

---

也可以在不将

onDateSet

方法移动到父活动的情况下解决此问题。您只需告诉

DatePickerFragment

在何处搜索视图：

public class DatePickerFragment extends DialogFragment implements
    DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        // do some stuff for example write on log and update TextField on activity
        Log.w("DatePicker","Date = " + year);
        ((TextView) getActivity().findViewById(R.id.tf_date)).setText("Date = " + year);
    }
}

---

我还将演员阵容的目标从

EditText

更改为

TextView

。通过这种方式，您可以对不同类型的视图重用您的实现，而不仅仅是对

EditText

我对上述答案有一个更正。

public void onDate(View view) {

        DialogFragment fragment = new SelectDateFragment();
        fragment.show(getFragmentManager(), "Date Picker");
    }

//  @SuppressLint("NewApi")
    class SelectDateFragment extends DialogFragment implements
            DatePickerDialog.OnDateSetListener {

        public Dialog onCreateDialog(Bundle savedInstanceState) {


            System.out.println("entrering on create dialog");;

            return new DatePickerDialog(getActivity(), this, mYear, mMonth,
                    mDay);//it will return dialog setting date with mYera,MMonth and MDay

        }

        @Override
        public void onDateSet(android.widget.DatePicker view, int year,
                int monthOfYear, int dayOfMonth) {
            System.out.println("year=" + year + "day=" + dayOfMonth + "month="
                    + monthOfYear);
            mYear=year;
            mMonth=monthOfYear;
            mDay=dayOfMonth;

            onPopulateSet(year, monthOfYear + 1, dayOfMonth);

        }
// set the selected date in the edit text  
        private void onPopulateSet(int year, int i, int dayOfMonth) {
            EditText et_setDate;
            et_setDate = (EditText) findViewById(R.id.register_et_dob);//register_et_dob:-id name of the edit text 
            et_setDate.setText(dayOfMonth + "/" + i + "/" + year);
            System.out.println("enetring on populate Set");

        }

而不是像这样返回DatePickerDialog

返回新的DatePickerDialog（getActivity（），（EditSessionActivity）getActivity（），年、月、日）

您应该以更通用的方式返回它

返回新的DatePickerDialog（getActivity（），（OnDateSetListener）getActivity（），年、月、日）

只需确保您的活动实现OnDateSetListener接口并重写onDateSet函数

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) 

---

我也有类似的问题，但我的日期选择器是从另一个片段中的一个对话框片段启动的。这使得处理回调非常困难，因为它们希望返回到主活动，我希望数据返回到上一个对话框片段

最初，我将新的日期值传递给主活动（使用OnDateSetListener），并打算使用启动日期选择器的对话框获取它们，但当日期选择器关闭时，该对话框中没有触发生命周期事件

我得到的结果是在日期选择器中的onDismiss中，实例化一个新的对话框片段，对其调用set results方法，然后启动它。当然，对于这一点，您需要确保前一个片段在启动日期选择器时被忽略

这是调用日期选择器的dialogFragment

public class NewTrialDialogFragment extends DialogFragment  {

public final String LOG_TAG = "NewTrialDialog Fragment";

Button startDateButton;
Integer newYear, newMonth, newDay;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.dialog_new_trial, container, false);
    getDialog().setTitle("Dialog New Trial");

    startDateButton = (Button) rootView.findViewById(R.id.button_start_date);
    startDateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showDatePickerDialog(v);
        }
    });

    //If you exit the datepicker without choosing anything, it returns zeros
    if (newYear != null && newMonth != null && newDay != null && newYear != 0) {
        startDateButton.setText(newYear + " " + newMonth + " " + newDay);
    }else{
        startDateButton.setText("Select Start Date");
    }

     return rootView;
}

public void showDatePickerDialog(View v) {
    TrialDatePickerDialog newDialog = new TrialDatePickerDialog();
    newDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
    this.dismiss();
}

public void setDates(int year, int month, int day){
    newYear = year;
    newMonth = month;
    newDay = day;
}}

public  class TrialDatePickerDialog extends DialogFragment implements DatePickerDialog.OnDateSetListener
     {

private final String LOG_TAG = "TrialDatePickerDialog";
int newYear, newMonth, newDay;


@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    // Create a new instance of TrialDatePickerDialog and return it
    return new DatePickerDialog(getActivity(), this , year, month, day);
}

         @Override
         public void onDismiss(DialogInterface dialog) {
             super.onDismiss(dialog);
             FragmentManager fm = getActivity().getSupportFragmentManager();
             NewTrialDialogFragment newTrialDialogFragment = new NewTrialDialogFragment();
             newTrialDialogFragment.setDates(newYear, newMonth, newDay);
             newTrialDialogFragment.show(fm, "new_trial_dialog");

         }

         @Override
         public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
             newYear = year;
             newMonth = monthOfYear;
             newDay = dayOfMonth;
         }
     }

还有日期选择器

public class NewTrialDialogFragment extends DialogFragment  {

public final String LOG_TAG = "NewTrialDialog Fragment";

Button startDateButton;
Integer newYear, newMonth, newDay;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.dialog_new_trial, container, false);
    getDialog().setTitle("Dialog New Trial");

    startDateButton = (Button) rootView.findViewById(R.id.button_start_date);
    startDateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showDatePickerDialog(v);
        }
    });

    //If you exit the datepicker without choosing anything, it returns zeros
    if (newYear != null && newMonth != null && newDay != null && newYear != 0) {
        startDateButton.setText(newYear + " " + newMonth + " " + newDay);
    }else{
        startDateButton.setText("Select Start Date");
    }

     return rootView;
}

public void showDatePickerDialog(View v) {
    TrialDatePickerDialog newDialog = new TrialDatePickerDialog();
    newDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
    this.dismiss();
}

public void setDates(int year, int month, int day){
    newYear = year;
    newMonth = month;
    newDay = day;
}}

public  class TrialDatePickerDialog extends DialogFragment implements DatePickerDialog.OnDateSetListener
     {

private final String LOG_TAG = "TrialDatePickerDialog";
int newYear, newMonth, newDay;


@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    // Create a new instance of TrialDatePickerDialog and return it
    return new DatePickerDialog(getActivity(), this , year, month, day);
}

         @Override
         public void onDismiss(DialogInterface dialog) {
             super.onDismiss(dialog);
             FragmentManager fm = getActivity().getSupportFragmentManager();
             NewTrialDialogFragment newTrialDialogFragment = new NewTrialDialogFragment();
             newTrialDialogFragment.setDates(newYear, newMonth, newDay);
             newTrialDialogFragment.show(fm, "new_trial_dialog");

         }

         @Override
         public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
             newYear = year;
             newMonth = monthOfYear;
             newDay = dayOfMonth;
         }
     }

---

Leszek的答案是有效的，但如果对话是从另一个片段开始的，则答案是无效的。在这种情况下，需要在创建对话框的代码中使用

setTargetFragment（）

，在对话框代码中使用

getTargetFragment（）

在创建对话框的代码中：

DialogFragment dialogFragment = new YourDialogFragment();
dialogFragment.setTargetFragment(YourParentFragment.this, 0);
dialogFragment.show(getFragmentManager(), "mydialog");

在对话框片段代码中：

@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
    DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener()
    {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
        {
            YourParentFragment parentFragment = (YourParentFragment) getTargetFragment();
            // Manipulate the parent fragment
            // ...
        }
    };
    // Get the initial date
    // ...
    return new DatePickerDialog(getActivity(), listener, year, month, day);
}

---

如果您必须将结果返回到片段，而不是活动，下面是一个完整的解决方案：

public class DatePickerDialogFragment extends DialogFragment  {

    private static final String ARGUMENT_YEAR = "ARGUMENT_YEAR";
    private static final String ARGUMENT_MONTH = "ARGUMENT_MONTH";
    private static final String ARGUMENT_DAY = "ARGUMENT_DAY";
    private DatePickerDialog.OnDateSetListener listener;

    private int year;
    private int month;
    private int dayOfMonth;

    public static DatePickerDialogFragment newInstance(final int year, final int month, final int dayOfMonth) {
        final DatePickerDialogFragment df = new DatePickerDialogFragment();
        final Bundle args = new Bundle();
        args.putInt(ARGUMENT_YEAR, year);
        args.putInt(ARGUMENT_MONTH, month);
        args.putInt(ARGUMENT_DAY, dayOfMonth);
        df.setArguments(args);
        return df;
    }

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

    private void retrieveArguments() {
        final Bundle args = getArguments();
        if (args != null) {
            year = args.getInt(ARGUMENT_YEAR);
            month = args.getInt(ARGUMENT_MONTH);
            dayOfMonth = args.getInt(ARGUMENT_DAY);
        }
    }

    @Override
    public Dialog onCreateDialog(final Bundle savedInstanceState) {
        return new DatePickerDialog(getContext(), this.listener, this.year, this.month, this.dayOfMonth);
    }

    public void setListener(final DatePickerDialog.OnDateSetListener listener) {
        this.listener = listener;
    }
}

然后在片段或活动中使用它：

final Calendar c = Calendar.getInstance();
DatePickerDialogFragment datePicker = DatePickerDialogFragment.newInstance(
        c.get(Calendar.YEAR),
        c.get(Calendar.MONTH),
        c.get(Calendar.DAY_OF_MONTH));
datePicker.setListener(this);
datePicker.show(getChildFragmentManager(), null);

科特林版本

DatePickerFragment类：

class DatePickerFragment : DialogFragment() {

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {

        val c = Calendar.getInstance()
        val year = c.get(Calendar.YEAR)
        val month = c.get(Calendar.MONTH)
        val day = c.get(Calendar.DAY_OF_MONTH)

        return DatePickerDialog(context!!, context!! as MainActivity, year, month, day)
    }
}

DatePickerDialog.OnDateSetListener被移动到MainActivity

class MainActivity : AppCompatActivity(), DatePickerDialog.OnDateSetListener {

    ..

    override fun onDateSet(view: DatePicker, year: Int, month: Int, day: Int) {
        //use date in your activity
    }
}

---

这是有用的，我将扩展我的问题，包括您的解决方案。我建议大家阅读关于实现接口的内容。我想您不是要强制转换到EditSessionActivity，而是要强制转换到OnDateSetListener。是的，您是对的，它将强制转换到OnDateSetListener，因为EditSessionActivity实现了OnDateSetListener，但您的建议会使代码更加清晰。如果您有两个或更多的日期字段，应该使用DatePickerDialog填充，您会怎么做？在onDateSet（）中，可以区分调用DatePickerDialog的是哪个字段吗？在这种情况下，我通常会实现自定义DialogFragment，它带有一些标志，让我以后可以区分显示它的是哪个字段。我还需要自定义侦听器。看看这个要点，例如实现。这是时间选择器，但日期选择器将非常类似。谢谢你，这是一个简单的情况下，多个日期字段的汉克斯，这是最简单的解决方案，我看到了迄今为止！当我尝试时，我得到了这个错误-片段应该是静态的，这样系统就可以重新实例化它们，匿名类也不是很有创造性，但是有一个更简单的方法：查看我的答案。这看起来不错，只是调用片段时我遇到了

.setListener（this）

的问题。我将该代码放入名为

bday

的编辑文本的

onClickListener

中，我希望在其中使用

setText

显示所选日期。你知道我应该如何使用你的解决方案吗？@frank17如果你想在click listener中使用它，并且DatePickerDialog.OnDateSetListener是由一个片段实现的，你应该使用setListener（YourFragment.this）。否则，这指的是clicklistener本身