Android-Notification手机状态栏通知

public class MainActivity extends Activity {
    static final int NOTIFICATION_ID = 0x123;
    NotificationManager notificationManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取系统的Notification对象
        notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    }
    //为发送通知的按钮点击事件定义事件处理方法
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    public void send(View source){
        //创建一个其他Activity的Intent
        Intent intent = new Intent(MainActivity.this,TextActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this,0,intent,0);
        Notification notification = new Notification.Builder(this)
                //设置打开通知 通知自动消失
                .setAutoCancel(true)
                //设置显示状态栏的通知提示信息
                .setTicker("注目提醒！")
                //设置通知图标
                .setSmallIcon(R.drawable.seek02)
                //设置通知内容标题
                .setContentTitle("该应用发生 爆炸大 大 大 新闻！！")
                //设置通知内容
                .setContentText("冒险没有 你手机自嗨罢了~")
                //设置使用默认的声音 LED灯
                .setDefaults(Notification.DEFAULT_SOUND|Notification.DEFAULT_LIGHTS)
                //设置通知自定义声音
//                .setSound()
                .setWhen(System.currentTimeMillis())
                //设置他只要启动的程序Intent
                .setContentIntent(pendingIntent)
                .build();
        notificationManager.notify(NOTIFICATION_ID,notification);
    }
    public void del(View view){
        //取消通知
        notificationManager.cancel(NOTIFICATION_ID);
    }
}

public class TextActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_t_exta_ctivity);
    }
}