Question

我想在我的应用中使用datepicker。我按照http://developer.android.com/guide/topics/ui/controls/pickers.html中的步骤开发了应用程序。

它有一个在选择日期时调用的方法。

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

    Toast.makeText(getContext(),"The date is: " + year + month + day ,Toast.LENGTH_LONG).show();
    // Do something with the date chosen by the user
}

现在我想在主要活动中使用日期。上述方法属于不同类：

   package com.example.shiza.cube26;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.widget.DatePicker;
import android.widget.Toast;

import java.util.Calendar;

/**
 * Created by Shiza on 04/10/2015.
 */
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) {

        Toast.makeText(getContext(),"The date is: " + year + month + day ,Toast.LENGTH_LONG).show();
        // Do something with the date chosen by the user
    }
}

我想将值表单onDateSet获取到MainActivity。我怎样才能做到这一点？请帮我解决这个问题。

编辑1：

我正在使用sharedprefrence来解决上述问题：

protected void onResume() {
    super.onResume();


    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);

    Toast.makeText(this,"I am in on resume",Toast.LENGTH_LONG).show();


    SharedPreferences sharedPreferences = this.getSharedPreferences("DATE_OF_JOURNEY", Context.MODE_PRIVATE);

    date = sharedPreferences.getString("DATE_OF_JOURNEY",null);
    if ( date  == null )
    {
        sharedPreferences.edit().putString("DATE_OF_JOURNEY", day + "/" + month + "/" + year).apply();
    }

    date_text.setText(date);


}

我写这样的日期：

public void onDateSet(DatePicker view, int year, int month, int day) {
    sharedPreferences = getActivity().getSharedPreferences("DATE_OF_JOURNEY", Context.MODE_PRIVATE);
    Toast.makeText(getContext(),"The date is: " + year + month + day ,Toast.LENGTH_LONG).show();

    sharedPreferences.edit().putString("DATE_OF_JOURNEY", day + "/" + month+"/"+ year).apply();
    // Do something with the date chosen by the user
}

但是，仍然高于代码不起作用？

Answer 1

一种选择是使用SharedPreferences并在那里保存您的年，月和日。然后阅读MainActivity的onResume()回调中的值。

另一种选择是在DatePickerFragment中创建一个接口，并在MainActivity中实现此接口。

修改：您也可以创建自定义BroadcastReceiver，然后在onDateSet()中发送邮件并在MainActivity

中接收邮件

如何在主要活动中使用datepicker值？

1 个答案: