大家好:
想問一下android 的自動通知功能怎麼做
我現在只能做到開啟程式時他發出通知
但我希望他是，
例如:圖書館書快到期它會自動通知你
你就知道要點APP去看你哪本書還沒還
這樣該如何做呢?
謝謝

public class MainActivity extends Activity {
	private Button sendNotice;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		testNotification();
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	} 
	private void testNotification() {
	    Notification.Builder builder = new Notification.Builder(this);
	    builder.setSmallIcon(R.drawable.ic_launcher)
	        .setPriority(Notification.PRIORITY_HIGH)
	        .setOngoing(true);
	    builder.setLights(Color.GREEN, 1000, 1000);
	    
	    builder.setContentText("書到期囉");
	    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
	    manager.notify(1, builder.build());
	}
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}