转于:http://www.cnblogs.com/linjiqin/archive/2011/12/14/2288074.html
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根据activity的生命周期,在activity不显示时,会执行onStop函数(比如按下home键),所以你在onStop函数(按退出键除外)里面把notification放在通知栏里,再此显示时,把notification从通知栏里去掉。或者,只要程序在运行就一直显示通知栏图标。
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下面对Notification类中的一些常量,字段,方法简单介绍一下:
常量:
DEFAULT_ALL??? 使用所有默认值,比如声音,震动,闪屏等等
DEFAULT_LIGHTS 使用默认闪光提示
DEFAULT_SOUNDS 使用默认提示声音
DEFAULT_VIBRATE 使用默认手机震动?
【说明】:加入手机震动,一定要在manifest.xml中加入权限:
<uses-permission android:name="android.permission.VIBRATE" />
以上的效果常量可以叠加,即通过
notification.defaults =DEFAULT_SOUND|DEFAULT_VIBRATE;??
notification.defaults |= DEFAULT_SOUND (最好在真机上测试,震动效果模拟器上没有)
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//设置flag位
FLAG_AUTO_CANCEL? 该通知能被状态栏的清除按钮给清除掉
FLAG_NO_CLEAR???? 该通知能被状态栏的清除按钮给清除掉
FLAG_ONGOING_EVENT 通知放置在正在运行
FLAG_INSISTENT 是否一直进行,比如音乐一直播放,知道用户响应
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常用字段:
contentIntent? 设置PendingIntent对象,点击时发送该Intent
defaults 添加默认效果
flags 设置flag位,例如FLAG_NO_CLEAR等
icon 设置图标
sound 设置声音
tickerText 显示在状态栏中的文字
when 发送此通知的时间戳
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NotificationManager常用方法介绍:
public void cancelAll() 移除所有通知(只是针对当前Context下的Notification)
public? void cancel(int id) 移除标记为id的通知 (只是针对当前Context下的所有Notification)
public? void notify(String tag ,int id, Notification notification) 将通知加入状态栏,标签为tag,标记为id
public? void notify(int id, Notification notification) 将通知加入状态栏,标记为id
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package ?com.ljq.activity; ? import ?android.app.Activity; import ?android.app.Notification; import ?android.app.NotificationManager; import ?android.app.PendingIntent; import ?android.content.Intent; import ?android.graphics.Color; import ?android.os.Bundle; ? public ?class ?MainActivity extends ?Activity { ???? /** Called when the activity is first created. */ ???? @Override ???? public ?void ?onCreate(Bundle savedInstanceState) { ???????? super .onCreate(savedInstanceState); ???????? setContentView(R.layout.main); ???????? clearNotification(); ???? } ???? ????? @Override ???? protected ?void ?onStop() { ???????? showNotification(); ???????? super .onStop(); ???? } ???? ????? @Override ???? protected ?void ?onStart() { ???????? clearNotification(); ???????? super .onStart(); ???? } ???? ????? /** ????? * 在状态栏显示通知 ????? */ ???? private ?void ?showNotification(){ ???????? // 创建一个NotificationManager的引用?? ???????? NotificationManager notificationManager = (NotificationManager)??? ???????????? this .getSystemService(android.content.Context.NOTIFICATION_SERVICE);?? ???????? ????????? // 定义Notification的各种属性?? ???????? Notification notification = new ?Notification(R.drawable.icon,?? ???????????????? "督导系统" , System.currentTimeMillis()); ???????? //FLAG_AUTO_CANCEL?? 该通知能被状态栏的清除按钮给清除掉 ???????? //FLAG_NO_CLEAR????? 该通知不能被状态栏的清除按钮给清除掉 ???????? //FLAG_ONGOING_EVENT 通知放置在正在运行 ???????? //FLAG_INSISTENT???? 是否一直进行,比如音乐一直播放,知道用户响应 ???????? notification.flags |= Notification.FLAG_ONGOING_EVENT; // 将此通知放到通知栏的"Ongoing"即"正在运行"组中?? ???????? notification.flags |= Notification.FLAG_NO_CLEAR; // 表明在点击了通知栏中的"清除通知"后,此通知不清除,经常与FLAG_ONGOING_EVENT一起使用?? ???????? notification.flags |= Notification.FLAG_SHOW_LIGHTS;?? ???????? //DEFAULT_ALL???? 使用所有默认值,比如声音,震动,闪屏等等 ???????? //DEFAULT_LIGHTS? 使用默认闪光提示 ???????? //DEFAULT_SOUNDS? 使用默认提示声音 ???????? //DEFAULT_VIBRATE 使用默认手机震动,需加上<uses-permission android:name="android.permission.VIBRATE" />权限 ???????? notification.defaults = Notification.DEFAULT_LIGHTS; ???????? //叠加效果常量 ???????? //notification.defaults=Notification.DEFAULT_LIGHTS|Notification.DEFAULT_SOUND; ???????? notification.ledARGB = Color.BLUE;?? ???????? notification.ledOnMS = 5000 ; //闪光时间,毫秒 ???????? ????????? // 设置通知的事件消息?? ???????? CharSequence contentTitle = "督导系统标题" ; // 通知栏标题?? ???????? CharSequence contentText = "督导系统内容" ; // 通知栏内容?? ???????? Intent notificationIntent = new ?Intent(MainActivity. this , MainActivity. class ); // 点击该通知后要跳转的Activity?? ???????? PendingIntent contentItent = PendingIntent.getActivity( this , 0 , notificationIntent, 0 );?? ???????? notification.setLatestEventInfo( this , contentTitle, contentText, contentItent);?? ???????? ????????? // 把Notification传递给NotificationManager?? ???????? notificationManager.notify( 0 , notification);?? ???? } |
???? //删除通知??? ???? private ?void ?clearNotification(){ ???????? // 启动后删除之前我们定义的通知?? ???????? NotificationManager notificationManager = (NotificationManager) this ????????????????? .getSystemService(NOTIFICATION_SERVICE);?? ???????? notificationManager.cancel( 0 );? ? ???? } } |