Question

为什么我的getSystemService显示错误The method getSystemService(String) is undefined for the type Ac

‍class MyClickListener3 implements View.OnClickListener { public void onClick(View e) { notification(); } public void notification() { NotificationManager mynotification=(NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE); Notification notification = new Notification(); notification.icon = R.drawable.ic_launcher; notification.tickerText="疯狂JAVA"; mynotification.notify(0,notification); } }

Answer 1

getSystemService的方法必须在Activity类中才能调用啊，亲～

你要想在你的MyClickListener3 调用，可以把相应的activity的上下文传进去：

‍class MyClickListener3 implements View.OnClickListener {
private Context mContext;
public MyClickListener3(Context context) {
mContext = context;

}

public void notification() { NotificationManager mynotification=(NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);

Activity中使用的方法：
MyClickListener3 myClickListener3 = new MyClickListener3(MyActivity.this);
mybuttion.setOnclickListener(myClickListener3);