android 开发 悬挂式notifacation

新的效果，在android5.0以后可以使用

直接上代码：

public class MainActivity extends AppCompatActivity {
Context myContext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button_1=findViewById(R.id.bt_1);
        Button button_2=findViewById(R.id.bt_2);
        button_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                NotificationManager mNotificationManager = (NotificationManager) myContext.getSystemService(NOTIFICATION_SERVICE);
                long when = System.currentTimeMillis();
                Notification notification = new Notification(R.mipmap.ic_launcher, "110", when);
                notification.flags = Notification.FLAG_ONGOING_EVENT;
                notification.flags = Notificat