通知

nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {            private Intent intent;            private Notification notification;            @Override            public void onClick(View view) {                intent = new Intent(MainActivity.this,SecondActivity.class);                PendingIntent pendingIntent=PendingIntent.getActivities(MainActivity.this,0, new Intent[]{intent},0);                Notification build = new Notification.Builder(MainActivity.this)                        .setSmallIcon(R.mipmap.ic_launcher)                        .setContentText("张三")                        .setTicker("你好")                        .setContentIntent(pendingIntent)                        .build();                nm.notify(1,build);            }        });    }