在消息通知的时候,我们经常用到两个控件Notification和Toast。特别是重要的和需要长时间显示的信息,用Notification最合适不过了。他可以在顶部显示一个图标以标示有了新的通知,当我们拉下通知栏的时候,可以看到详细的通知内容。
      最典型的应用就是未看短信和未接来电的显示,还有QQ微信,我们一看就知道有一个未接来电或者未看短信,收到QQ离线信息。同样,我们也可以自定义一个Notification来定义我们自己的程序想要传达的信息。
Notification我把他分为两种,一种是默认的显示方式,另一种是自定义的,今天为大家讲述默认的显示方式:
1、程序框架结构图如下

2、布局文件 main.xml 源码如下
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:textColor="#EEE" android:textStyle="bold" android:textSize="25sp" android:text="NotificationDemo实例" /> <Button android:id="@+id/btnSend" android:text="send notification" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center"/> </LinearLayout>
3、MainActivity.java源码如下:
package com.andyidea.notification;  import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button;  public class MainActivity extends Activity {  private Button btnSend;    //定义BroadcastReceiver的action  private static final String NotificationDemo_Action = "com.andyidea.notification.NotificationDemo_Action";    /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);      btnSend = (Button)findViewById(R.id.btnSend);   btnSend.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {     Intent intent = new Intent();     intent.setAction(NotificationDemo_Action);     sendBroadcast(intent);    }   });  }   } 4、布局文件 secondlayou.xml 源码如下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:textColor="#EEE" android:textStyle="bold" android:textSize="25sp" android:text="显示通知界面" /> <Button android:id="@+id/btnCancel" android:text="cancel notification" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" /> </LinearLayout>
5、SecondActivity.java源码如下:
package com.andyidea.notification;  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 SecondActivity extends Activity {   private Button btnCancel;  //声明Notification  private Notification notification;  //声明NotificationManager  private NotificationManager mNotification;  //标识Notification的ID  private static final int ID = 1;    @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.secondlayout);      btnCancel = (Button)findViewById(R.id.btnCancel);   //怎样获得NotificationManager的实例?   String service = NOTIFICATION_SERVICE;   mNotification = (NotificationManager)getSystemService(service);      //获得Notification的实例   notification = new Notification();      //设置该图标 会在状态栏显示   int icon = notification.icon = android.R.drawable.stat_sys_phone_call;   //设置提示信息   String tickerText = "Test Notification";   //设置显示时间   long when = System.currentTimeMillis();   notification.icon = icon;   notification.tickerText = tickerText;   notification.when = when;      Intent intent = new Intent(this, MainActivity.class);   PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0);   notification.setLatestEventInfo(this, "消息", "SMS Android", pi);   mNotification.notify(ID, notification);      btnCancel.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {     mNotification.cancel(ID); //--->取消通知    }   });  }   } 6、NotificationReceiver.java源码如下:
package com.andyidea.notification;  import com.andyidea.notification.SecondActivity;  import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent;  public class NotificationReceiver extends BroadcastReceiver {   @Override  public void onReceive(Context context, Intent intent) {   //实例化Intent   Intent i = new Intent();   //在新任务中启动Activity   i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);   //设置Intent启动的组件名称   i.setClass(context, SecondActivity.class);   //启动Activity,显示通知   context.startActivity(i);  }  } 7、程序运行效果如下:

以上就是针对Android中Notification使用方法进行的详细介绍,希望对大家的学习有所启发,帮助大家更好地学习Android软件编程。
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