接口传值实例DatePickerDialog

1.第一步创建class，类名自己取，这里我使用DatePickerFragment1

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import android.widget.DatePicker;

import java.util.Calendar;

/**
 * Created by mac on 17/6/7.
 */
public class DatePickerFragment1  extends DialogFragment implements DatePickerDialog.OnDateSetListener{

    public OnDateInputListener onDateInputListener;

//创建接口类
    public interface OnDateInputListener {
       //接口函数
       public void getDate(int year, int month, int day);
    }

    public void setOnDateInputListener(OnDateInputListener onDateInputListener) {
        this.onDateInputListener = onDateInputListener;
    }
    @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 something with the date chosen by the user
        onDateInputListener.getDate(year, month + 1, day);
    }

}

2.第二步实现接口类

implements DatePickerFragment1.OnDateInputListener

3.第三步创建监听

 DatePickerFragment1 newFragment = new DatePickerFragment1();
        newFragment.show(getFragmentManager(), "datePicker");


        newFragment.setOnDateInputListener(this);

4.第四部实现接口的方法

public void getDate(int year, int month, int day){
        button.setText(year+"-"+month+"-"+day);


    }

使用：

   DialogFragment dialogFragment1 = new DatePickerFragment();
                dialogFragment1.show(getFragmentManager(), "datePicker");

<item name="android:datePickerDialogTheme">@style/style_date_picker_dialog</item>
</style>