本文实例讲述了android编程实现闹钟的方法。分享给大家供大家参考，具体如下：
在android中，有一个闹钟的类，alarmmanager类，我们可以通过其来对系统内的通知进行操作！
本文用到了service和broadcast两个后台管理，在处理时，曾出现过很多问题，但经过半天的努力，终于解决了！
首先是main.xml文件：
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <textview android:id="@+id/mtext" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <button android:id="@+id/settimebutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/settimebutton" /> <button android:id="@+id/cancelbutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/cancelbutton" /> </linearlayout>
mainactivity.java:
我要评论
package com.chiefcto.alarm;
import java.text.format;
import java.util.calendar;
import android.app.activity;
import android.app.alarmmanager;
import android.app.pendingintent;
import android.app.timepickerdialog;
import android.content.intent;
import android.os.bundle;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.textview;
import android.widget.timepicker;
public class mainactivity extends activity {
//properties
private button msetbutton;
private button mcancelbutton;
private alermreceiver uireceiver;
private textview mtextview;
//就用了java的日历
private calendar calendar;
/** called when the activity is first created. */
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
calendar = calendar.getinstance();
mtextview = (textview)this.findviewbyid(r.id.mtext);
msetbutton = (button)this.findviewbyid(r.id.settimebutton);
mcancelbutton = (button)findviewbyid(r.id.cancelbutton);
msetbutton.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
// todo auto-generated method stub
calendar.settimeinmillis(system.currenttimemillis());
int hour = calendar.get(calendar.hour_of_day);
int minute = calendar.get(calendar.minute);
new timepickerdialog(mainactivity.this, new timepickerdialog.ontimesetlistener() {
@override
public void ontimeset(timepicker view, int hourofday, int minute) {
calendar.settimeinmillis(system.currenttimemillis());
//set(f, value) changes field f to value.
calendar.set(calendar.hour_of_day, hourofday);
calendar.set(calendar.minute, minute);
calendar.set(calendar.second, 0);
calendar.set(calendar.millisecond, 0);
intent intent = new intent(mainactivity.this, alermreceiver.class);
intent.putextra("music", true);
pendingintent pendingintent = pendingintent.getbroadcast(mainactivity.this, 0, intent, 0);
alarmmanager am;
//获取系统进程
am = (alarmmanager)getsystemservice(alarm_service);
am.set(alarmmanager.rtc_wakeup, calendar.gettimeinmillis(), pendingintent);
//设置周期！！
am.setrepeating(alarmmanager.rtc_wakeup, system.currenttimemillis()+(10*1000), (24*60*60*1000), pendingintent);
string tmps = "设置闹钟时间为："+format(hourofday)+":"+format(minute);
mtextview.settext(tmps);
}
},hour,minute,true).show();
}
});
mcancelbutton.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
intent intent = new intent(mainactivity.this, alermreceiver.class);
intent.putextra("music", true);
pendingintent pendingintent = pendingintent.getbroadcast(mainactivity.this, 0, intent, 0);
alarmmanager am;
//获取系统进程
am = (alarmmanager)getsystemservice(alarm_service);
//cancel
am.cancel(pendingintent);
mtextview.settext("取消了！");
}
});
}
private string format(int x) {
string s = ""+x;
if(s.length() == 1)
s = "0"+s;
return s;
}
}
alarmservice.java
package com.chiefcto.alarm;
import java.io.ioexception;
import android.app.service;
import android.content.context;
import android.content.intent;
import android.media.audiomanager;
import android.media.mediaplayer;
import android.media.ringtonemanager;
import android.net.uri;
import android.os.binder;
import android.os.bundle;
import android.os.ibinder;
public class alarmservice extends service {
// mediaplayer实例
private mediaplayer player;
// ibinder实例
@override
public ibinder onbind(intent intent) {
playmusic();
return null;
}
@override
public void oncreate() {
// todo auto-generated method stub
super.oncreate();
playmusic();
}
@override
public void ondestroy() {
// todo auto-generated method stub
super.ondestroy();
if (player != null) {
player.stop();
player.release();
}
}
@override
public void onstart(intent intent, int startid) {
// todo auto-generated method stub
super.onstart(intent, startid);
if (intent != null) {
bundle bundle = intent.getextras();
if (bundle != null) {
if(bundle.getboolean("music"))
playmusic();
else
stopmusic();
}
}
}
public void playmusic() {
if(player == null) {
uri uri = ringtonemanager.getdefaulturi(ringtonemanager.type_alarm);
try {
player = new mediaplayer();
player.setdatasource(this, uri);
final audiomanager audiomanager = (audiomanager)this
.getsystemservice(context.audio_service);
if (audiomanager.getstreamvolume(audiomanager.stream_alarm) != 0) {
player.setaudiostreamtype(audiomanager.stream_alarm);
player.setlooping(true);
player.prepare();
}
} catch (illegalstateexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
}
if(!player.isplaying()) {
player.start();
}
}
public void stopmusic() {
if (player != null) {
player.stop();
try {
// 在调用stop后如果需要再次通过start进行播放,需要之前调用prepare函数
player.prepare();
} catch (ioexception ex) {
ex.printstacktrace();
}
}
}
}
下面就是本文的关键性代码，了解activity到broadcast的机制，这小应用就很好实现了~
alermreceiver.java
package com.chiefcto.alarm;
import java.io.ioexception;
import java.util.calendar;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.media.audiomanager;
import android.media.mediaplayer;
import android.media.ringtonemanager;
import android.net.uri;
import android.os.bundle;
import android.util.log;
import android.widget.toast;
public class alermreceiver extends broadcastreceiver {
private mediaplayer mmediaplayer;
context context;
@override
public void onreceive(context context, intent intent) {
// todo auto-generated method stub
calendar calendar = calendar.getinstance();
calendar.settimeinmillis(system.currenttimemillis());
int minute = calendar.get(calendar.minute);
charsequence text = string.valueof(minute);
toast.maketext(context, text, toast.length_long).show();
this.context = context;
bundle bundle = intent.getextras();
intent serviceintent = new intent("chief_musicservice");
serviceintent.putextras(bundle);
if(bundle != null) {
log.i("cto", string.valueof(bundle.getboolean("music")));
if(bundle.getboolean("music"))
context.startservice(serviceintent);
else
context.stopservice(serviceintent);
}
//在这里是播放不了的！！
//playalarmring();
}
private void playalarmring() {
uri uri = ringtonemanager.getdefaulturi(ringtonemanager.type_alarm);
try {
mmediaplayer = new mediaplayer();
mmediaplayer.setdatasource(context, uri);
final audiomanager audiomanager = (audiomanager) context
.getsystemservice(context.audio_service);
if (audiomanager.getstreamvolume(audiomanager.stream_alarm) != 0) {
mmediaplayer.setaudiostreamtype(audiomanager.stream_alarm);
mmediaplayer.setlooping(true);
mmediaplayer.prepare();
}
} catch (illegalstateexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
mmediaplayer.start();
}
private void stopalarmring() {
mmediaplayer.stop();
}
}
要注意的是mainifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.chiefcto.alarm"
android:versioncode="1"
android:versionname="1.0">
<uses-sdk android:minsdkversion="7" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".mainactivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.main" />
<category android:name="android.intent.category.launcher" />
</intent-filter>
</activity>
<service android:name=".alarmservice">
<intent-filter>
<action android:name="chief_musicservice"/>
<category android:name="android.intent.category.default"/>
</intent-filter>
</service>
<receiver android:name=".alermreceiver" android:process=":remote"/>
</application>
<uses-permission android:name="android.permission.mout_unmount_filesystems"/>
</manifest>
注：在模拟器中是运行不了的~
ps：关于androidmanifest.xml文件相关属性功能可参考本站在线工具：
android manifest功能与权限描述大全：
更多关于android相关内容感兴趣的读者可查看本站专题：《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》
希望本文所述对大家android程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
Error running app: Default Activity Not Found
如何用HMS Nearby Service给自己的App添加近距离数据传输功能
BlockChain：2020年7月10日世界人工智能大会WAIC《链智未来 赋能产业区块链主题论坛》(四)
网友评论