private NotificationManager manager;
    private Notification.Builder builder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        // 创建一个通知管理类
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        builder = new Notification.Builder(this);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainActivity.this, MainActivity.class);
                PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0, intent, 0);
                builder.setContentIntent(pendingIntent);
                builder.setContentTitle("new Notification here");
                builder.setContentText("hello furong");
                builder.setSmallIcon(R.drawable.a1);
                builder.setTicker("有通知来了"); // 第一次出现在状态栏
                // 需要用户授权 android.permission.VIBRATE
                builder.setDefaults(Notification.DEFAULT_ALL); // 所有的提示都默认
                Notification notification = builder.build();
                manager.notify(1000, notification);
            }
        });
    }