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

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

   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:  }

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:  }

Android学习到此告一段落，经过一周的学习（严格的说学习的时间外加写论文的时间是一周，总结、写博客的时间远远大于一周）只能对Android有个大致的了解，还有很多方面由于时间的原因不能够深入学习，甚至很多都没有接触到，以后有时间再学习吧。

Android，有缘我们还会再见！