Android中通过Notification&NotificationManager实现消息通知

 package com.xin.day__notificationdemo;
  import java.util.Timer;
  import java.util.TimerTask;
  import android.app.Activity;
  import android.app.Notification;
  import android.app.NotificationManager;
  import android.app.PendingIntent;
 import android.content.Intent;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
 import android.support.v.app.NotificationCompat;
 import android.support.v.app.NotificationCompat.BigPictureStyle;
 import android.support.v.app.NotificationCompat.BigTextStyle;
 import android.support.v.app.NotificationCompat.Builder;
 import android.util.Log;
 import android.view.View;
 public class MainActivity extends Activity {
   //通知的唯一标识，在一个应用程序中不同的通知要区别开来
   private static final int NO = x;
   private static final int NO = x;
   private static final int NO = x;
   private static final int NO = x;
   //进度条要用
   private int progress = ;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
   }
   //click方法，和xml文件中的各个按钮的onClick属性的值要一致
   public void click(View view) {
     //创建NotificationManager
     final NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
     //用switch语句控制四个控件
     switch (view.getId()) {
     case R.id.btn_: {
       Notification notification = new Notification();
       notification.icon = R.drawable.ic_launcher;
       notification.tickerText = "有消息了。。。";
       Intent intent = new Intent(this, MainActivity.class);
       PendingIntent pendingIntent = PendingIntent.getActivity(this, ,
           intent, PendingIntent.FLAG_UPDATE_CURRENT);
       notification.setLatestEventInfo(this, ".以前的通知", "试试而已", pendingIntent);
       notification.when = System.currentTimeMillis();
       notification.defaults = Notification.DEFAULT_ALL;
       notification.flags = Notification.FLAG_AUTO_CANCEL;
       notification.number = ;
       notification.vibrate = new long[]{, };
       manager.notify(NO, notification);
     }
     break;
     case R.id.btn_:{
       //大视图文本通知
       //创建消息构造器,在扩展包
       NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
       //设置当有消息是的提示，图标和提示文字
       builder.setSmallIcon(R.drawable.ic_launcher).setTicker("有新消息了");
       //需要样式
       BigTextStyle style = new BigTextStyle();
       style.setBigContentTitle("上课通知");//通知的标题
       style.bigText("今天下午要在综B上jsp");//通知的文本内容
       //大视图文本具体内容
       style.setSummaryText("这是正常的课程安排，请各位同学按时上课");
       builder.setStyle(style);
       //显示消息到达的时间，这里设置当前时间
       builder.setWhen(System.currentTimeMillis());
       //获取一个通知对象
       Notification notification = builder.build();
       notification.flags = Notification.FLAG_AUTO_CANCEL;
       //发送(显示)通知
       //notify()第一个参数id An identifier for this notification unique within your application
       //get&＃63;意思说，这个通知在你的应用程序中唯一的标识符
       manager.notify(NO, notification);
     }
     break;
     case R.id.btn_:{
       //大视图图片通知
       NotificationCompat.Builder builderPic = new Builder(this);
       builderPic.setSmallIcon(R.drawable.ic_launcher).setTicker("新浪体育提醒");
       //进行设置
       BigPictureStyle pictureStyle = new BigPictureStyle();
       pictureStyle.setBigContentTitle("新浪体育 快船VS骑士 ");
       pictureStyle.bigPicture(BitmapFactory.decodeResource(getResources(), R.drawable.ic_game));
       pictureStyle.setSummaryText(" 快船VS骑士 天王山之战！！！");//不要在意文字
       //设置样式
       builderPic.setStyle(pictureStyle);
       //设置显示的时间
       builderPic.setWhen(System.currentTimeMillis());
       Notification notification = pictureStyle.build();
       notification.flags = Notification.FLAG_AUTO_CANCEL;
       //
       manager.notify(NO, notification);
     }
     break;
     case R.id.btn_:{
       //进度条通知
       final NotificationCompat.Builder builderProgress = new NotificationCompat.Builder(this);
       builderProgress.setSmallIcon(R.drawable.ic_launcher).setTicker("进度条通知");
       builderProgress.setProgress(, progress, false);
       final Notification notification = builderProgress.build();
       //发送一个通知
       manager.notify(NO, notification);
       //创建一个计时器
       Timer timer = new Timer();
       timer.schedule(new TimerTask(){
         @Override
         public void run() {
           Log.i("progress",progress+"");
           while(progress <= ){
             progress ++;
             try {
               Thread.sleep();
             } catch (InterruptedException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
             }
             //更新进度条
             builderProgress.setProgress(, progress, false);
             //再次通知
             manager.notify(NO, builderProgress.build());
           }
           //计时器退出
           this.cancel();
           //进度条退出
           manager.cancel(NO);
           return;//结束方法
         }
       }, );
     }
     break;
     default:
       break;
     }
   }
 }