如何将DialogFragment中的日期返回到容器活动？

Question

我有一项活动打开DialogFragment，其中包含DatePicker。如何将选定日期返回到我的活动及其在TextView中的状态？我检查了Android文档中的示例，但它们根本不清楚。我是编程新手。我找到的所有教程都只显示如何在DialogFragment内的吐司中显示日期。

这是我的DialogFrament代码

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener{

DatePickerFragmentListener datePickerListener;

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    final Calendar c = Calendar.getInstance();

    //this makes current date as the default date of the calander
    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 interface DatePickerFragmentListener {
     void onDateSet(DatePicker view, int year, int month, int day);
}

@Override
public void onDateSet(DatePicker view, int year, int month, int day ){

    // what do i put here?
}
}

我在活动中将onDateSet方法放在什么内？

public class FilterGuideList extends AppCompatActivity implements DatePickerFragment.DatePickerFragmentListener {

private LinearLayout from_date;
private LinearLayout to_date;
private TextView from_text;
private TextView to_text;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_filter_guide_list);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    //initializing linearlayouts for date picker clickevent
    from_date = (LinearLayout) findViewById(R.id.from_date_selector);
    to_date = (LinearLayout) findViewById(R.id.to_date_selector);

    from_text = (TextView) findViewById(R.id.from_date_text);
    to_text = (TextView) findViewById(R.id.to_date_text);


    from_date.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            DialogFragment newFragment = new DatePickerFragment();
            newFragment.show(getFragmentManager(), "datePicker");

        }
    });

    to_date.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            DialogFragment newFragment = new DatePickerFragment();
            newFragment.show(getFragmentManager(), "datePicker");

        }
    });
}


@Override
public void onDateSet(DatePicker view, int year, int month, int day) {

      // what do i put here?

}
}

我一直试图让这个工作2天了。任何帮助将非常感激。

Answer 1

https://github.com/wdullaer/MaterialDateTimePicker 将以上库用于datePicker。

dependencies {
  compile 'com.wdullaer:materialdatetimepicker:2.3.0'
}

实施OnDateSetListener

@Override
public void onDateSet(DatePickerDialog view, int year, int monthOfYear, int dayOfMonth) {
  String date = "You picked the following date: "+dayOfMonth+"/"+(monthOfYear+1)+"/"+year;
  dateTextView.setText(date);
}

使用提供的工厂

创建DatePickerDialog

Calendar now = Calendar.getInstance();
DatePickerDialog dpd = DatePickerDialog.newInstance(
  MainActivity.this,
  now.get(Calendar.YEAR),
  now.get(Calendar.MONTH),
  now.get(Calendar.DAY_OF_MONTH)
);
dpd.show(getFragmentManager(), "Datepickerdialog");

有关演示和详细信息，请访问here。

Answer 2

 public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener{

 DatePickerFragmentListener datePickerListener;

 @Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

final Calendar c = Calendar.getInstance();

//this makes current date as the default date of the calander
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 interface DatePickerFragmentListener {
 void onDateSet(DatePicker view, int year, int month, int day);
 }

 @Override
 public void onDateSet(DatePicker view, int year, int month, int day ){
 datePickerListener.onDataSet(view,year,month,day)

 }

您的活动

   public class FilterGuideList extends AppCompatActivity implements DatePickerFragment.DatePickerFragmentListener {

   private LinearLayout from_date;
   private LinearLayout to_date;
   private TextView from_text;
   private TextView to_text;

   ...
   ....
   @Override
   public void onDateSet(DatePicker view, int year, int month, int day) {

   //now you will get value of view,year,month and day here , you can put log here

   }