Android之notification

xml代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.notification.MainActivity$PlaceholderFragment" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="30dp"
android:layout_marginTop="20dp"
android:text="显示通知状态栏" />

</RelativeLayout>

Java代码：

package com.example.notification;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.NotificationCompat;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.Notification.Builder;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Build;

public class MainActivity extends ActionBarActivity {
private Button button=null;
private NotificationManager notificationManager;
// private Notification.Builder builder;
private NotificationCompat.Builder builder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
button=(Button) findViewById(R.id.button1);
notificationManager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
builder=new NotificationCompat.Builder(MainActivity.this);

button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent myIntent=new Intent(MainActivity.this, MainActivity.class);
PendingIntent intent= PendingIntent.getActivity(MainActivity.this, 0, myIntent, 0);
builder.setContentTitle("a notification is coming");
builder.setContentText("hello world");
builder.setContentIntent(intent);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setTicker("有通知来了");//第一次出现在状态栏的内容
builder.setDefaults(Notification.DEFAULT_ALL);//所有的提示都是默认的
Notification notification=builder.build();
notificationManager.notify(1000, notification);//展示一个通知在状态栏中
}
});

}

}