Android——通知（Notification）

通知是Android的一个比较有特色的功能，当应用程序不在前台运行时，向用户发出的一些提示信息，信息由通知图标、通知标题及下拉可视详细内容组成。Notification用法比较灵活，可以在Activity里创建，可以在广播接收器里创建，也可以在服务里创建。通知在Activity和广播接收器里应用较多，但是创建的方法基本一致。下面是Notification的创建步骤。通知的创建方法

一、获得一个NotificationManager

Class Overview

Class to notify the user of events that happen. This is how you tell the user that something has happened in the background.

Notifications can take different forms:

A persistent icon that goes in the status bar and is accessible through the launcher, (when the user selects it, a designated Intent can be launched),
Turning on or flashing LEDs on the device, or
Alerting the user by flashing the backlight, playing a sound, or vibrating.

You do not instantiate this class directly; instead, retrieve it through getSystemService(Class) .

Notification参考文档

由Context的getSystemService()得到。实例代码： NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)

二、创建一个NotificationCompat.Builder对象

Notification参考文档

Class Overview

A class that represents how a persistent notification is to be presented to the user using theNotificationManager.

TheNotification.Builderhas been added to make it easier to construct Notifications.

三、调用

public class MainActivity extends Activity implements OnClickListener {

//private Button sendNotice;
//public static final int NOTIFICATION_ID = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendNotice = (Button) findViewById(R.id.send_notice);
sendNotice.setOnClickListener(this);
}

public void onClick(View v) {
switch(v.getId()) {
case R.id.send_notice:
//一、得到一个NotificationManager，获取系统的NOTIFICATION_SERVICE服务
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
//二、得到一个NotificationCompat.Builder，并运用其方法完成图标、标题、内容的设置
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)//小通知图标
.setSubText("Tap to view documentation about notifications.")//简化的通知内容或提示
.setTicker("leeyevi")//通知栏的标签
.setContentTitle("My notification")//下拉通知看到标题
.setContentText("Hello World!");//通知内容
//三、Define the Notification's Action
Intent intent = new Intent(this, NotificationActivity.class);
PendingIntent resultPendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
//四、Set the Notification's Click Behavior
mBuilder.setContentIntent(resultPendingIntent);
manager.notify(1, mBuilder.build());
}
}
}

public class NotificationActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notification_layout);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
//取消通知
manager.cancel(1);
}
}

Class Overview

Class Overview

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