android中service启动activity

2种方法

1.直接启动

 Intent intent = new Intent();
 intent.setClassName("com.jinwei", "com.jinwei.A");
 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 this.startActivity(intent);

2. Pending启动

     try {
         getPendingIntent().send();
     } catch (CanceledException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
     }

 private PendingIntent getPendingIntent() {
     Intent callback = new Intent();
     callback.setClass(this, A.class);
     callback.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP);
     return PendingIntent.getActivity(this, 0,