android应用开发详解（十六）------------------Notification

Notification和NotificationManager

（1）获得系统级的服务NotificationManager，通过Context.getSystemService（）方法。

（2）实例化Notification对象，并设置其属性

（3）调用setLatestEventInfo()方法在视图中设置图标和时间

（4）发出通知

1、工程目录



2、MainActivity.java

package com.example.test_notification;

import android.os.Bundle;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
// 声明两个按钮
private Button sendBtn, cancelBtn;
// 声明Notification
private Notification n;
// 声明NotificationManager
private NotificationManager nm;
// Notification表示ID
private static final int ID = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 实例化两个按钮
sendBtn = (Button) findViewById(R.id.send);
cancelBtn = (Button) findViewById(R.id.cancel);
// 获得NotificationManager实例
String service = NOTIFICATION_SERVICE;
nm = (NotificationManager) getSystemService(service);
// 实例化Notification
n = new Notification();
// 设置显示图标，该图标会在状态栏显示
int icon = n.icon = R.drawable.ic_launcher;
// 设置显示信息，该信息会在状态栏显示
String tickerTest = "Test Notification";
// 设置显示时间
long when = System.currentTimeMillis();
n.icon = icon;
n.tickerText = tickerTest;
n.when = when;
sendBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
// 实例化intent
Intent intent = new Intent(MainActivity.this,
MainActivity.class);
// 获得pendingintent
PendingIntent pi = PendingIntent.getActivity(MainActivity.this,
0, intent, 0);
// 设置事件信息
n.setLatestEventInfo(MainActivity.this, "My Title",
"My Context", pi);
// 发出通知
nm.notify(ID, n);
}
});
cancelBtn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
nm.cancel(ID);

}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

3、布局文件main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送广播" />

<Button
android:id="@+id/cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="取消广播" />

</LinearLayout>