如何在服务Android中检查数据库

时间:2018-11-04 20:13:43

标签: android service android-asynctask

我现在正在开发Android一个月,似乎无法找到解决方案。

我想发送的通知是,如果数据库中有任何更改,似乎无法在Google上找到答案。我想知道的是:我应该在服务上运行asynctask吗?还是直接在MyService类的startcommand的doInBackground内部运行代码?我该如何实现?

我尝试将asynctask投入服务并在doInBackground上使用代码,但无法使其正常工作,因此,如果你们知道答案,可以张贴一些代码来指导我吗?谢谢

1 个答案:

答案 0 :(得分:0)

`公共类AlertService扩展服务{     公共AlertService(){     }

@Override
public IBinder onBind(Intent intent) {
    throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onCreate() {
    super.onCreate();

}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    StringRequest sr = new StringRequest(Request.Method.POST, "http://localhost/ServiceAlarme.php",
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try
                    {
                        JSONObject js=new JSONObject(response);
                        String etat=js.getString("etat");
                        if(etat.equals("1"))
                        {
                            int NOTIFICATION_ID = 12345;
                            NotificationManager notif = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                            Notification n = new Notification.Builder(getApplicationContext()).setContentTitle("SERVICE ALARME").setContentText("Alerte du ALARME du GAZ").setSmallIcon(R.mipmap.bubble).build();
                            n.defaults |= Notification.DEFAULT_SOUND;
                            n.flags |=Notification.FLAG_AUTO_CANCEL;
                            long[] vibrate = { 0, 100, 200, 300 };
                            n.vibrate = vibrate;
                            notif.notify(NOTIFICATION_ID,n);
                        }
                        else
                        {
                        }
                    }
                    catch(Exception e)
                    {
                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                }
            }) {
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
            params.put("d","0");
            return params;
        }
    };
    RequestQueue rq= Volley.newRequestQueue(getApplicationContext());
    rq.add(sr);

    return super.onStartCommand(intent, flags, startId);
}

} `