Android 开发工具类 16_NotificationActivity

在前台运行的 Activity 可以通过Dialog、Toast 向用户发出提示信息，而后台运行的程序，如下载、收到信息等 Service 应用，则需要使用 Notification(通知)向用户发出提示信息。

 import android.app.Activity;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.RemoteViews;

 public class NotificationActivity extends Activity {

     Button b1;
     NotificationManager nmanager;
     Notification notification;
     int notificationID=1;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         setContentView(R.layout.notificationlayout);
         b1=(Button) findViewById(R.id.notification_bt1);
         b1.setOnClickListener(new OnClickListener(){
             @Override
             public void onClick(View v) {
                 //sendNotification();
                 sendCustomNotification();
             }}
         );
     }

     // 发送自定义通知
     public void sendCustomNotification(){
         //1.获得 NotificationManager
         nmanager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         //2.创建 Notification
         notification =new Notification(
             R.drawable.folder_open,
             "收到文件",
             System.currentTimeMillis()
             );
         RemoteViews rv = new RemoteViews(getPackageName(),R.layout.notificationinterfacelayout);
         rv.setImageViewResource(R.id.notification_img, R.drawable.savefile);
         rv.setTextViewText(R.id.notification_title, "催眠曲.mp3");
         rv.setProgressBar(R.id.notification_progressbar, 100, 20, false);
         notification.contentView=rv;
         //3.设置属性，这些属性会在展开状态栏后显示
         Intent intent =new Intent(this,ToastActivity.class);    //转向其他
         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);
         PendingIntent pIntent=PendingIntent.getActivity(this, 0, intent, 0);
         notification.contentIntent=pIntent;
         //4.将Notification发给Manager
         nmanager.notify(notificationID++, notification);
     }

     // 发送通知
     public void sendNotification(){
         //1.获得NotificationManager
         nmanager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         //2.创建Notification
         notification =new Notification(
             R.drawable.folder_open,
             "收到文件",
             System.currentTimeMillis()
             );
         // 可选属性
         notification.defaults|=Notification.DEFAULT_SOUND;
         notification.flags |=Notification.FLAG_INSISTENT;

         // 3.设置属性，这些属性会在展开状态栏后显示
         Intent intent =new Intent(this,ToastActivity.class);    //转向其他
         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);
         PendingIntent pIntent=PendingIntent.getActivity(this, 0, intent, 0);
         notification.setLatestEventInfo(this, "接收文件", "文件已经下载完成", pIntent);
         // 4.将 Notification 发给 Manager
         nmanager.notify(notificationID++, notification);
     }

 }