title: How to make the notification disappeared after the user have clicked on it
body: <p>Please take a look at my code:</p>
  
  <pre><code>package com.yarin.android.Examples_04_23;
  
  import android.app.Activity;
  import android.app.Notification;
  import android.app.NotificationManager;
  import android.app.PendingIntent;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.Button;
  
  public class Activity01 extends Activity {
      Button m_Button1;
  
      //声明通知（消息）管理器
      NotificationManager m_NotificationManager;
      Intent m_Intent;
      PendingIntent m_PendingIntent;
  
      /**
       * Called when the activity is first created.
       */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          //初始化NotificationManager对象
          m_NotificationManager = (NotificationManager)  getSystemService(NOTIFICATION_SERVICE);
  
          //获取按钮对象
          m_Button1 = (Button) findViewById(R.id.Button01);
  
  
          //点击通知时转移内容
          m_Intent = new Intent(Activity01.this, Activity02.class);
          //主要是设置点击通知时显示内容的类
          m_PendingIntent = PendingIntent.getActivity(Activity01.this, 0, m_Intent, 0);
  
  
          m_Button1.setOnClickListener(new Button.OnClickListener() {
              public void onClick(View v) {
                  Notification m_Notification = new Notification();
                  //设置通知在状态栏显示的图标
                  m_Notification.icon = R.drawable.img1;
                  //当我们点击通知时显示的内容
                  m_Notification.tickerText = "Button1通知内容...........";
                  //通知时发出默认的声音
                  m_Notification.defaults = Notification.DEFAULT_SOUND;
                  //设置通知显示的参数
                  m_Notification.setLatestEventInfo(Activity01.this, "Button1", "Button1通知", m_PendingIntent);
                  //可以理解为执行这个通知
                  m_NotificationManager.notify(0, m_Notification);
              }
          });
  
  
      }
  }
  </code></pre>
  
  <p>When a user click on the button <code>click</code> , a notification will appear on the application bar. However, the notification will stay there <strong>for ever</strong> after a user have click on it 
  <img src="https://i.stack.imgur.com/gOL1b.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/ODh0O.png" alt="enter image description here"></p>