【移动应用开发技术】Android中怎么实现一个闹钟功能

【移动应用开发技术】Android中怎么实现一个闹钟功能

本篇文章为大家展示了Android中怎么实现一个闹钟功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。AlarmViewpackage

com.example.lenovo.clock2;

import

android.app.AlarmManager;

import

android.app.PendingIntent;

import

android.app.TimePickerDialog;

import

android.content.Context;

import

android.content.DialogInterface;

import

android.content.Intent;

import

android.content.SharedPreferences;

import

android.icu.util.Calendar;

import

android.os.Build;

import

android.support.annotation.Nullable;

import

android.support.annotation.RequiresApi;

import

android.support.v7.app.AlertDialog;

import

android.util.AttributeSet;

import

android.view.View;

import

android.widget.AdapterView;

import

android.widget.ArrayAdapter;

import

android.widget.Button;

import

android.widget.LinearLayout;

import

android.widget.ListView;

import

android.widget.TimePicker;

import

java.util.Date;

/**

*

Created

by

lenovo

on

2017/11/20.

*/

//闹钟

public

class

AlarmView

extends

LinearLayout

{

//

public

AlarmView(Context

context,

@Nullable

AttributeSet

attrs,

int

defStyleAttr)

{

//

super(context,

attrs,

defStyleAttr);

//

}

public

AlarmView(Context

context,

@Nullable

AttributeSet

attrs)

{

super(context,

attrs);

init();

}

public

AlarmView(Context

context)

{

super(context);

init();

}

private

void

init(){

alarmManager=

(AlarmManager)

getContext().getSystemService(Context.ALARM_SERVICE);

}

@RequiresApi(api

=

Build.VERSION_CODES.N)

@Override

protected

void

onFinishInflate()

{

super.onFinishInflate();

btnAddAlarm=findViewById(R.id.btnAddAlarm);

lvAlarmList=findViewById(R.id.lvAlarmList);

adapter=new

ArrayAdapter<AlarmView.AlarmData>(getContext(),R.layout.support_simple_spinner_dropdown_item);

lvAlarmList.setAdapter(adapter);

readSavedAlarmList();

//adapter.add(new

AlarmData(System.currentTimeMillis()));

btnAddAlarm.setOnClickListener(new

OnClickListener()

{

@RequiresApi(api

=

Build.VERSION_CODES.N)

@Override

public

void

onClick(View

view)

{

addAlarm();

}

});

lvAlarmList.setOnItemLongClickListener(new

AdapterView.OnItemLongClickListener(){

@Override

public

boolean

onItemLongClick(AdapterView<?>

adapterView,

View

view,

final

int

position,

long

id)

{

new

AlertDialog.Builder(getContext()).setTitle("操作选项").setItems(new

CharSequence[]{"删除"},

new

DialogInterface.OnClickListener()

{

@Override

public

void

onClick(DialogInterface

dialogInterface,

int

which)

{

switch

(which){

case

0:

deleteAlarm(position);

break;

default:

break;

}

}

}).setNegativeButton("取消",null).show();

return

true;

}

});

}

private

void

deleteAlarm(int

position){

AlarmData

ad=adapter.getItem(position);

adapter.remove(ad);

saveAlarmList();//重新保存

alarmManager.cancel(PendingIntent.getBroadcast(getContext(),ad.getId(),new

Intent(getContext(),AlarmReceiver.class),0));

}

@RequiresApi(api

=

Build.VERSION_CODES.N)

private

void

addAlarm(){

//获取当前时间

Calendar

c=Calendar.getInstance();

//时间选择框

new

TimePickerDialog(getContext(),

new

TimePickerDialog.OnTimeSetListener()

{

@Override

public

void

onTimeSet(TimePicker

view,

int

hourOfDay,

int

minute)

{

Calendar

calendar

=Calendar.getInstance();

calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);

calendar.set(Calendar.MINUTE,minute);

calendar.set(Calendar.SECOND,0);

calendar.set(Calendar.MILLISECOND,0);

//写出当前时间

Calendar

currentTime=Calendar.getInstance();

//设置时间小于当前时间，往后推一天

if(calendar.getTimeInMillis()<=currentTime.getTimeInMillis()){

calendar.setTimeInMillis(calendar.getTimeInMillis()+24*60*60*1000);

}

AlarmData

ad=new

AlarmData(calendar.getTimeInMillis());

adapter.add(ad);

/*

第一个参数

RTC操作系统时间为启动时间点，WAKEUP系统休眠时同样执行

第二个参数

什么时候启动

第三个参数

启动之后什么时间再次启动

第四个参数

Pendingintent挂起的Intent,不立即执行

*/

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,

ad.getTime(),//当前时间当做请求码

5*60*1000,

//执行广播

PendingIntent.getBroadcast(getContext(),

ad.getId(),

new

Intent(getContext(),

AlarmReceiver.class),

0));

//每一个闹钟对应一个请求码，根据请求码移除特定的闹钟,那么把时间当做请求码

saveAlarmList();

}

},c.get(Calendar.HOUR_OF_DAY),c.get(Calendar.MINUTE),true).show();

}

//保存闹钟数据

private

void

saveAlarmList(){

SharedPreferences.Editor

editor=getContext().getSharedPreferences(AlarmView.class.getName(),Context.MODE_PRIVATE).edit();

StringBuffer

sb=new

StringBuffer();

for(int

i=0;i<adapter.getCount();i++){

sb.append(adapter.getItem(i).getTime()).append(",");

}

if(sb.length()>1){

String

content=sb.toString().substring(0,sb.length()-1);//去掉最后一个逗号

editor.putString(KEY_ALARM_LIST,content);

}else{

editor.putString(KEY_ALARM_LIST,null);

}

mit();

}

//读取已存数据

@RequiresApi(api

=

Build.VERSION_CODES.N)

private

void

readSavedAlarmList(){

SharedPreferences

sp=getContext().getSharedPreferences((AlarmView.class.getName()),

Context.MODE_PRIVATE);

String

content=sp.getString(KEY_ALARM_LIST,null);

if(content!=null){

String[]

timeStrings=content.split(",");

for(String

string:timeStrings){

adapter.add(new

AlarmData(Long.parseLong(string)));

}

}

}

private

static

final

String

KEY_ALARM_LIST="alarmList";

private

Button

btnAddAlarm;

private

ListView

lvAlarmList;

private

ArrayAdapter<AlarmData>

adapter;

private

AlarmManager

alarmManager;//系统的闹钟服务

private

static

class

AlarmData{

//闹钟所要响起的时间

@RequiresApi(api

=

Build.VERSION_CODES.N)

public

AlarmData(long

time){

this.time=time;

date=

Calendar.getInstance();

date.setTimeInMillis(time);

timeLable=String.format("%d月%d日

%d:%d",

date.get(Calendar.MONTH)+1,//getMonth的返回值是从0开始的

date.get(Calendar.DAY_OF_MONTH),

date.get(Calendar.HOUR_OF_DAY),

date.get(Calendar.MINUTE));

}

public

long

getTime(){

return

time;

}

public

String

getTimeLable(){

return

timeLable;

}

@Override

public

String

toString()

{

return

getTimeLable();

}

public

int

getId(){

return

(int)(getTime()/1000/60);//精确到分钟，getTime为毫秒

}

//获取时间的标签

private

String

timeLable="";

private

long

time=0;

private

Calendar

date;

}

}TimeViewpackage

com.example.lenovo.clock2;

import

android.content.Context;

import

android.icu.util.Calendar;

import

android.os.Build;

import

android.os.Handler;

import

android.os.Message;

import

android.support.annotation.IntDef;

import

android.support.annotation.NonNull;

import

android.support.annotation.Nullable;

import

android.support.annotation.RequiresApi;

import

android.util.AttributeSet;

import

android.view.View;

import

android.widget.LinearLayout;

import

android.widget.TextView;

/**

*

Created

by

lenovo

on

2017/11/20.

*/

//时钟

显示目前的时间

public

class

TimeView

extends

LinearLayout

{

public

TimeView(Context

context,

@Nullable

AttributeSet

attrs,

int

defStyleAttr)

{

super(context,

attrs,

defStyleAttr);

}

public

TimeView(Context

context,

@Nullable

AttributeSet

attrs)

{

super(context,

attrs);

}

public

TimeView(Context

context)

{

super(context);

}

@Override

protected

void

onFinishInflate()

{

super.onFinishInflate();

tvTime=findViewById(R.id.tvTime);

tvTime.setText("这里显示时间");

timerHander.sendEmptyMessage(0);

}

//判断可见属性是否发生改变

@Override

protected

void

onVisibilityChanged(View

changedView,

int

visibility)

{

super.onVisibilityChanged(changedView,

visibility);

if(getVisibility()==

View.VISIBLE){

timerHander.sendEmptyMessage(0);//可见，则呈现

}else{

timerHander.removeMessages(0);//否则移除所有消息

}

}

//刷新时间

@RequiresApi(api

=

Build.VERSION_CODES.N)

private

void

refreshTime(){

Calendar

c=Calendar.getInstance();

tvTime.setText(String.format("%d:%d:%d",c.get(Calendar.HOUR_OF_DAY),c.get(Calendar.MINUTE),c.get(Calendar.SECOND)));

}

//Hander每隔一秒执行一次

private

Handler

timerHander=new

Handler(){

@RequiresApi(api

=

Build.VERSION_CODES.N)

@Override

public

void

handleMessage(Message

msg)

{

refreshTime();

//若为当前页面，则刷新；否则，没有必要刷新

if

(getVisibility()==

View.VISIBLE)

{

timerHander.sendEmptyMessageDelayed(0,

1000);//1000毫秒后再执行handleMessage方法

}

};

};

private

TextView

tvTime;

}AlarmReceiverpackage

com.example.lenovo.clock2;

import

android.app.AlarmManager;

import

android.app.PendingIntent;

import

android.content.BroadcastReceiver;

import

android.content.Context;

import

android.content.Intent;

/**

*

Created

by

lenovo

on

2017/11/23.

*/

public

class

AlarmReceiver

extends

BroadcastReceiver

{

@Override

public

void

onReceive(Context

context,

Intent

intent)

{

AlarmManager

am=

(AlarmManager)

context.getSystemService(Context.ALARM_SERVICE);

am.cancel(PendingIntent.getBroadcast(context,getResultCode(),new

Intent(context,AlarmReceiver.class),0));

Intent

i=new

Intent(context,PlayAlarmAty.class);

i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(i);

}

}MainActivitypackage

com.example.lenovo.clock2;

import

android.app.Activity;

import

android.support.v7.app.AppCompatActivity;

import

android.os.Bundle;

import

android.widget.TabHost;

public

class

MainActivity

extends

Activity

{

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tabHost=

(TabHost)

findViewById(R.id.tabhost);

tabHost.setup();

//setContent()为声明内容

tabHost.addTab(tabHost.newTabSpec("tabTime").setIndicator("时钟").setContent(R.id