--------------------------------------------CallUp.java-------------------------------------
package?com.ch07.callback;
?
/**
?*?
?*?项目名称：com.ch07.callback????
?*?类名称：CallUp????
?*?类描述：?打电话类
?*?创建人：fy???
?*?创建时间：2012-11-9?下午6:28:38???
?*?Copyright?(c)?方勇-版权所有
?*/
public?class?CallUp?{
?
/*?打电话,回调方法?*/
public?void?callme(OnCallBack?onCallBack)?{
onCallBack.execute();
}
?
/*?接口作为参数传递?*/
public?interface?OnCallBack?{
?
void?execute();
}
}
?
--------------------------------------------TestCall.java-------------------------------------
package?com.ch07.callback;
?
/**
?*?
?*?场景描述：??
?*?
?*?java回调函数?
?*?什么是回调？(What)?
?*?精妙比喻：我把手机号码给你，你通过手机号码联系我
?
?*?具体解释：
?*?我把我的手机号码给你，你通过电话号码打电话?联系我
?*?我把我的手机号码给你，你通过电话号码发短信?联系我
?
?*?共同的部分：
?*?我把我的手机号码给你，你通过电话号码(****)联系我
?
?*?不同的部分
?*?每次在使用的时候，选择是打电话或是发短信。
?
?*?回调都做了什么？?
?*?将变动与不变的代码分离，变动的代码在每次使用时确认
?
?*?什么情况使用回调？为什么要使用回调？?
?*?步骤固定，但有一部分内容只有在使用的时候才能知道。
?*?
?*/
public?class?TestCall?{
?
public?static?void?main(String[]?args)?{
/*?实例化电话类?*/
CallUp?callUp?=?new?CallUp();
/*?拨打对方的电话,只需要知道对方的手机号码?*/
callUp.callme(new?CallUp.OnCallBack()?{
?
@Override
public?void?execute()?{
System.out.println("回调方法");
}
?
});
}
}
--------------------------------------------DatePickerDialog.java---------------------------------
/*
?*?Copyright?(C)?2007?The?Android?Open?Source?Project
?*
?*?Licensed?under?the?Apache?License,?Version?2.0?(the?"License");
?*?you?may?not?use?this?file?except?in?compliance?with?the?License.
?*?You?may?obtain?a?copy?of?the?License?at
?*
?*??????http://www.apache.org/licenses/LICENSE-2.0
?*
?*?Unless?required?by?applicable?law?or?agreed?to?in?writing,?software
?*?distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS,
?*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied.
?*?See?the?License?for?the?specific?language?governing?permissions?and
?*?limitations?under?the?License.
?*/
?
package?android.app;
?
import?android.content.Context;
import?android.content.DialogInterface;
import?android.content.DialogInterface.OnClickListener;
import?android.os.Bundle;
import?android.text.format.DateUtils;
import?android.view.LayoutInflater;
import?android.view.View;
import?android.widget.DatePicker;
import?android.widget.DatePicker.OnDateChangedListener;
?
import?com.android.internal.R;
?
import?java.util.Calendar;
?
/**
?*?A?simple?dialog?containing?an?[email protected]}.
?*
?*?<p>See?the?<a?href="[email protected]}resources/tutorials/views/hello-datepicker.html">Date?Picker
?*?tutorial</a>.</p>
?*/
public?class?DatePickerDialog?extends?AlertDialog?implements?OnClickListener,
????????OnDateChangedListener?{
?
????private?static?final?String?YEAR?=?"year";
????private?static?final?String?MONTH?=?"month";
????private?static?final?String?DAY?=?"day";
?
????private?final?DatePicker?mDatePicker;
????private?final?OnDateSetListener?mCallBack;
????private?final?Calendar?mCalendar;
?
????private?boolean?mTitleNeedsUpdate?=?true;
?
????/**
?????*?The?callback?used?to?indicate?the?user?is?done?filling?in?the?date.
?????*/
????public?interface?OnDateSetListener?{
?
????????/**
?????????*?@param?view?The?view?associated?with?this?listener.
?????????*?@param?year?The?year?that?was?set.
?????????*?@param?monthOfYear?The?month?that?was?set?(0-11)?for?compatibility
?????????*??with?[email protected]}.
?????????*?@param?dayOfMonth?The?day?of?the?month?that?was?set.
?????????*/
????????void?onDateSet(DatePicker?view,?int?year,?int?monthOfYear,?int?dayOfMonth);
????}
?
????/**
?????*?@param?context?The?context?the?dialog?is?to?run?in.
?????*?@param?callBack?How?the?parent?is?notified?that?the?date?is?set.
?????*?@param?year?The?initial?year?of?the?dialog.
?????*?@param?monthOfYear?The?initial?month?of?the?dialog.
?????*?@param?dayOfMonth?The?initial?day?of?the?dialog.
?????*/
????public?DatePickerDialog(Context?context,
????????????OnDateSetListener?callBack,
????????????int?year,
????????????int?monthOfYear,
????????????int?dayOfMonth)?{
????????this(context,?0,?callBack,?year,?monthOfYear,?dayOfMonth);
????}
?
????/**
?????*?@param?context?The?context?the?dialog?is?to?run?in.
?????*?@param?theme?the?theme?to?apply?to?this?dialog
?????*?@param?callBack?How?the?parent?is?notified?that?the?date?is?set.
?????*?@param?year?The?initial?year?of?the?dialog.
?????*?@param?monthOfYear?The?initial?month?of?the?dialog.
?????*?@param?dayOfMonth?The?initial?day?of?the?dialog.
?????*/
????public?DatePickerDialog(Context?context,
????????????int?theme,
????????????OnDateSetListener?callBack,
????????????int?year,
????????????int?monthOfYear,
????????????int?dayOfMonth)?{
????????super(context,?theme);
?
????????mCallBack?=?callBack;
?
????????mCalendar?=?Calendar.getInstance();
?
????????Context?themeContext?=?getContext();
????????setButton(BUTTON_POSITIVE,?themeContext.getText(R.string.date_time_done),?this);
????????setIcon(0);
?
????????LayoutInflater?inflater?=
????????????????(LayoutInflater)?themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
????????View?view?=?inflater.inflate(R.layout.date_picker_dialog,?null);
????????setView(view);
????????mDatePicker?=?(DatePicker)?view.findViewById(R.id.datePicker);
????????mDatePicker.init(year,?monthOfYear,?dayOfMonth,?this);
????????updateTitle(year,?monthOfYear,?dayOfMonth);
????}
?
????public?void?onClick(DialogInterface?dialog,?int?which)?{
????????tryNotifyDateSet();
????}
?
????public?void?onDateChanged(DatePicker?view,?int?year,
????????????int?month,?int?day)?{
????????mDatePicker.init(year,?month,?day,?this);
????????updateTitle(year,?month,?day);
????}
?
????/**
?????*?Gets?the?[email protected]}?contained?in?this?dialog.
?????*
?????*?@return?The?calendar?view.
?????*/
????public?DatePicker?getDatePicker()?{
????????return?mDatePicker;
????}
?
????/**
?????*?Sets?the?current?date.
?????*
?????*?@param?year?The?date?year.
?????*?@param?monthOfYear?The?date?month.
?????*?@param?dayOfMonth?The?date?day?of?month.
?????*/
????public?void?updateDate(int?year,?int?monthOfYear,?int?dayOfMonth)?{
????????mDatePicker.updateDate(year,?monthOfYear,?dayOfMonth);
????}
?
????private?void?tryNotifyDateSet()?{
????????if?(mCallBack?!=?null)?{
????????????mDatePicker.clearFocus();
????????????mCallBack.onDateSet(mDatePicker,?mDatePicker.getYear(),
????????????????????mDatePicker.getMonth(),?mDatePicker.getDayOfMonth());
????????}
????}
?
????@Override
????protected?void?onStop()?{
????????tryNotifyDateSet();
????????super.onStop();
????}
?
????private?void?updateTitle(int?year,?int?month,?int?day)?{
????????if?(!mDatePicker.getCalendarViewShown())?{
????????????mCalendar.set(Calendar.YEAR,?year);
????????????mCalendar.set(Calendar.MONTH,?month);
????????????mCalendar.set(Calendar.DAY_OF_MONTH,?day);
????????????String?title?=?DateUtils.formatDateTime(mContext,
????????????????????mCalendar.getTimeInMillis(),
????????????????????DateUtils.FORMAT_SHOW_DATE
????????????????????|?DateUtils.FORMAT_SHOW_WEEKDAY
????????????????????|?DateUtils.FORMAT_SHOW_YEAR
????????????????????|?DateUtils.FORMAT_ABBREV_MONTH
????????????????????|?DateUtils.FORMAT_ABBREV_WEEKDAY);
????????????setTitle(title);
????????????mTitleNeedsUpdate?=?true;
????????}?else?{
????????????if?(mTitleNeedsUpdate)?{
????????????????mTitleNeedsUpdate?=?false;
????????????????setTitle(R.string.date_picker_dialog_title);
????????????}
????????}
????}
?
????@Override
????public?Bundle?onSaveInstanceState()?{
????????Bundle?state?=?super.onSaveInstanceState();
????????state.putInt(YEAR,?mDatePicker.getYear());
????????state.putInt(MONTH,?mDatePicker.getMonth());
????????state.putInt(DAY,?mDatePicker.getDayOfMonth());
????????return?state;
????}
?
????@Override
????public?void?onRestoreInstanceState(Bundle?savedInstanceState)?{
????????super.onRestoreInstanceState(savedInstanceState);
????????int?year?=?savedInstanceState.getInt(YEAR);
????????int?month?=?savedInstanceState.getInt(MONTH);
????????int?day?=?savedInstanceState.getInt(DAY);
????????mDatePicker.init(year,?month,?day,?this);
????}
}
?
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