android notification的用法

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Notification和NotificationManager的操作相对比较简单，一般用来获取系统级的服务NotificationManager，然后实例化Notification的对象,设置它的一系列属性(比如说图标、时间、标题、内容等)，最后通过NotificationManager发出通知即可。

The description from SDK about Notification：

AclassthatrepresentshowapersistentnotificationistobepresentedtotheuserusingtheNotificationManager.

TheNotification.BuilderhasbeenaddedtomakeiteasiertoconstructNotifications.

Foraguidetocreatingnotifications,seetheCreatingStatusBarNotificationsdocumentintheDevGuide.

接下来使用一个简单的案例来演示一下Notification的使用：

首先MainActivity的代码如下：

publicclassMainActivityextendsActivity{
privateButtonbtnSend;

//定义BroadcastReceiver的action
privatestaticfinalStringNotificationDemo_Action="com.ceo.notification.activity.NotificationDemo_Action";

/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//getthewidgets'instance
getInstance();

btnSend.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
Intentintent=newIntent();
intent.setAction(NotificationDemo_Action);
sendBroadcast(intent);
}
});
}

publicvoidgetInstance(){
btnSend=(Button)findViewById(R.id.btnSend);

}
}

相对应的main.xml布局：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#EEE"
android:textStyle="bold"
android:textSize="25sp"
android:text="Notification应用的小案例"
/>
<Button
android:id="@+id/btnSend"
android:text="sendnotification"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

SecondActivity的代码如下：

publicclassSecondActivityextendsActivity{
privateButtonbtnCancel;
//声明Notification
privateNotificationnotification;
//声明NotificationManager
privateNotificationManagermNotification;
//标识Notification的ID
privatestaticfinalintID=1;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);

getInstance();
//怎样获得NotificationManager的实例?
Stringservice=NOTIFICATION_SERVICE;
mNotification=(NotificationManager)getSystemService(service);

//获得Notification的实例
notification=newNotification();

//设置该图标会在状态栏显示
inticon=notification.icon=android.R.drawable.stat_notify_chat;
//设置提示信息
StringtickerText="TestNotification";
//设置显示时间
longwhen=System.currentTimeMillis();
notification.icon=icon;
notification.tickerText=tickerText;
notification.when=when;

Intentintent=newIntent(this,MainActivity.class);
PendingIntentpi=PendingIntent.getActivity(this,0,intent,0);
notification.setLatestEventInfo(this,"消息","HelloAndroid",pi);
mNotification.notify(ID,notification);

btnCancel.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
mNotification.cancel(ID);//--->取消通知
}
});
}

publicvoidgetInstance(){
btnCancel=(Button)findViewById(R.id.btnCancel);
}

}

相对应的second.xml布局：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#EEE"
android:textStyle="bold"
android:textSize="25sp"
android:text="显示通知界面"
/>
<Button
android:id="@+id/btnCancel"
android:text="cancelnotification"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

MyReceiver的代码如下：

publicclassMyReceiverextendsBroadcastReceiver{

@Override
publicvoidonReceive(Contextcontext,Intentintent){
//实例化Intent
Intenti=newIntent();
//在新任务中启动Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//设置Intent启动的组件名称
i.setClass(context,SecondActivity.class);
//启动Activity,显示通知
context.startActivity(i);
}

}

当然不要忘了在AndroidManifest文件中注册广播和Activity等：

<?xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:android="http://schemas.android.com/apk/res/android"
package="com.ceo.notification.activity"
android:versionCode="1"
android:versionName="1.0">
<applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
<activityandroid:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<actionandroid:name="android.intent.action.MAIN"/>
<categoryandroid:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiverandroid:name="MyReceiver">
<intent-filter>
<actionandroid:name="com.ceo.notification.activity.NotificationDemo_Action"/>
</intent-filter>
</receiver>
<activityandroid:name=".SecondActivity"></activity>
</application>
<uses-sdkandroid:minSdkVersion="8"/>

</manifest>

最后直接上图：

至此Android中Notification的使用介绍完毕，预祝大家成功。