Android周学习Step By Step（9）--Intent之广播（完）

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通过broadcast Intent机制可以将一个Intent发送给任何对这个Intent感兴趣的BroadcastReceiver。

通过new Intent（ACTION_1）新建Action为ACTION_1的Intent。

通过sendBroadcast（intent）将这个intent进行广播。代码如下

ActivityMain代码：
   1:  package com.eoeandroid.broadcastReceiver;
   2:  import android.app.NotificationManager;
   3:  import android.content.BroadcastReceiver;
   4:  import android.content.Context;
   5:  import android.content.Intent;
   6:  public class EoeAndroidReceiver2 extends BroadcastReceiver {
   7:      Context context;
   8:      @Override
   9:      public void onReceive(Context context, Intent intent) {
  10:          // TODO Auto-generated method stub
  11:          this.context = context;
  12:          DeleteNotification();
  13:      }
  14:      private void DeleteNotification() {        
  15:          NotificationManager notificationManager = (NotificationManager) context
  16:                  .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
  17:          notificationManager.cancel(EoeAndroidReceiver1.NOTIFICATION_ID);
  18:      
  19:      }
  20:  }
当单击MENU的第一项后，程序执行到EoeAndroidReceiver1，通过OnRecievie方法将一个Notification显示在了状态栏中。其中showNotification（）负责显示一个Notification。代码如下：

EoeAndroidReceiver1代码
<style type="text/css">  </style>
   1:  package com.eoeandroid.broadcastReceiver;
   2:  import android.app.Notification;
   3:  import android.app.NotificationManager;
   4:  import android.app.PendingIntent;
   5:  import android.content.BroadcastReceiver;
   6:  import android.content.Context;
   7:  import android.content.Intent;
   8:  public class EoeAndroidReceiver1 extends BroadcastReceiver {
   9:      Context context;
  10:      public static int NOTIFICATION_ID = 21321;
  11:      @Override
  12:      public void onReceive(Context context, Intent intent) {
  13:          this.context = context;
  14:          showNotification();
  15:      }
  16:      private void showNotification() {
  17:          NotificationManager notificationManager = (NotificationManager) context
  18:                  .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
  19:          Notification notification = new Notification(R.drawable.icon,
  20:                  "在EoeAndroidReceiver1中", System.currentTimeMillis());
  21:          PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
  22:                  new Intent(context, ActivityMain.class), 0);
  23:          notification.setLatestEventInfo(context, "在EoeAndroidReceiver1中", null,
  24:                  contentIntent);
  25:          notificationManager.notify(NOTIFICATION_ID, notification);
  26:      }
  27:  }
<style type="text/css">  </style>
单击第二个按钮后程序开始广播，这个广播被EoeAndroidReceiver2截获然后开始执行EoeAndroidReceiver2里的OnReceive方法，其中DeleteNotification（）方法负责将刚才生成的Notification从状态栏中删除。代码如下：

EoeAndroidReceiver2代码
   1:  package com.eoeandroid.broadcastReceiver;
   2:  import android.app.NotificationManager;
   3:  import android.content.BroadcastReceiver;
   4:  import android.content.Context;
   5:  import android.content.Intent;
   6:  public class EoeAndroidReceiver2 extends BroadcastReceiver {
   7:      Context context;
   8:      @Override
   9:      public void onReceive(Context context, Intent intent) {
  10:          // TODO Auto-generated method stub
  11:          this.context = context;
  12:          DeleteNotification();
  13:      }
  14:      private void DeleteNotification() {        
  15:          NotificationManager notificationManager = (NotificationManager) context
  16:                  .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
  17:          notificationManager.cancel(EoeAndroidReceiver1.NOTIFICATION_ID);    
  18:      }
  19:  }
<style type="text/css">  </style>