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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。
AlarmView
package 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);
}
editor.commit();
}
//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;
}
}TimeView
package 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;
}AlarmReceiver
package 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);
}
}MainActivity
package 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.tabTime));
tabHost.addTab(tabHost.newTabSpec("tabAlarm").setIndicator("闹钟").setContent(R.id.tabAlarm));
tabHost.addTab(tabHost.newTabSpec("tabTimer").setIndicator("计时器").setContent(R.id.tabTimer));
tabHost.addTab(tabHost.newTabSpec("tabStopWatch").setIndicator("秒表").setContent(R.id.tabStopWatch));
}
private TabHost tabHost;
}PlayAlarmAty
package com.example.lenovo.clock2;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.annotation.Nullable;
/**
* Created by lenovo on 2017/11/25.
*/
public class PlayAlarmAty extends Activity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alarm_player_aty);
mp=MediaPlayer.create(this,R.raw.mine);
mp.start();
}
@Override
protected void onPause() {
super.onPause();
finish();
}
@Override
protected void onDestroy() {
super.onDestroy();
mp.stop();
mp.release();
}
private MediaPlayer mp;
//音乐播放器
}上述内容就是Android中怎么实现一个闹钟功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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