Java 来自JSON的通知服务

如何发出通知？ 当有新闻时，如何检查新闻日期并显示通知？ 服务能否从

片段
获取SharedRef并进行检查，然后发出通知或否

TabFragment1.class
code:

@Override
protected void onPostExecute(StringBuilder stringBuilder) {

    try {
        JSONObject jsonObject = new JSONObject(stringBuilder.toString());
        JSONArray array = jsonObject.getJSONArray("articles");
        for (int i = 0; i < array.length(); i++) {
            JSONObject object = array.getJSONObject(i);
            String title = object.getString("title");
            String desc = object.getString("description");
            String imageUrl = object.getString("urlToImage");
            String articleUrl = object.getString("url");
            String newsdata = object.getString("publishedAt");

            sPref = getActivity().getSharedPreferences("MyPref", MODE_PRIVATE);
            SharedPreferences.Editor ed = sPref.edit();
            ed.putString(SAVED_TEXT, newsdata);
            ed.commit();
            Toast.makeText(getActivity(), "Text saved", Toast.LENGTH_SHORT).show();
            News news = new News(title, desc, imageUrl, articleUrl);
            myAdapter.addNews(news);

            myAdapter.notifyDataSetChanged();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

@覆盖
PostExecute上受保护的void（StringBuilder StringBuilder）{
试一试{
JSONObject JSONObject=新的JSONObject（stringBuilder.toString（））；
JSONArray数组=jsonObject.getJSONArray（“文章”）；
对于（int i=0；i

通知服务代码：

public class Notification extends Service {
    String datanews;
    String titlenotif;
    String destnotif;
    MyAsynk asynk;
    final String SAVED_TEXT = "saved_text";
    String checker;
    SharedPreferences sPref;

    @Override
    public void onCreate() {
        super.onCreate();
        Timer timer = new Timer();
        timer.schedule(new UpdateTimeTask(), 0, 1800000); //тикаем каждые 30 мinute без задержки 1800000
    }

    class UpdateTimeTask extends TimerTask {
        public void run() {
            sPref = getSharedPreferences("MyPref",MODE_PRIVATE);
            String savedText = sPref.getString(SAVED_TEXT, "");
            checker = sPref.getString(savedText, "0");

            if(datanews != checker){
                asynk = new MyAsynk();
                asynk.execute();
                createNotification(getApplicationContext());//пушим уведомление
            } else {
                asynk = new MyAsynk();
                asynk.execute();
            }
        }
    }

    class MyAsynk extends AsyncTask<Void,Void,StringBuilder> {
        @Override
        protected StringBuilder doInBackground(Void... voids) {
            StringBuilder stringBuilder = new StringBuilder();
            String key = "0aa2713d5a1a4aad9a914c9294f6a22b";
            try {
                URL url = new URL("https://newsapi.org/v1/articles?source=the-next-web&sortBy=latest&apiKey=" + key);
                URLConnection uc = url.openConnection();
                uc.connect();
                BufferedInputStream in = new BufferedInputStream(uc.getInputStream());
                int ch;
                while ((ch = in.read()) != -1) {
                    stringBuilder.append((char) ch);
                }
            } catch (Exception e) {e.printStackTrace();}

            return stringBuilder;
        }

        @Override
        protected void onPostExecute(StringBuilder stringBuilder) {
            try {
                JSONObject jsonObject = new JSONObject(stringBuilder.toString());
                JSONArray array = jsonObject.getJSONArray("articles");
                for (int i = 0; i < array.length(); i++) {
                    JSONObject object = array.getJSONObject(i);
                    String title = object.getString("title");
                    String desc = object.getString("description");
                    String newsdata = object.getString("publishedAt");
                    datanews = newsdata;
                    titlenotif = title;
                    destnotif = desc;
                }
            }
            catch (Exception e){e.printStackTrace();}
        }
    }

    private void createNotification(Context context) {
        NotificationManager manager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder ncBuilder = new NotificationCompat.Builder(context);
        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0);
        ncBuilder.setVibrate(new long[]{500});
        ncBuilder.setLights(Color.WHITE, 3000, 3000);
        ncBuilder.setSound(Settings.System.DEFAULT_NOTIFICATION_URI);
        ncBuilder.setContentIntent(pIntent);
        ncBuilder.setContentTitle(titlenotif + "");
        ncBuilder.setContentText(destnotif + "");
        ncBuilder.setTicker("You have news!");
        ncBuilder.setSmallIcon(R.drawable.news_icon);
        ncBuilder.setAutoCancel(true);
        manager.notify((int)System.currentTimeMillis(),ncBuilder.build());
    }
    public IBinder onBind(Intent arg0) {
        return null;
    }
}

公共类通知扩展服务{
字符串数据新闻；
字符串标题符号；
字符串destnotif；
MyAsynk-asynk；
最后一个字符串SAVED_TEXT=“SAVED_TEXT”；
字符串检查器；
共享引用sPref；
@凌驾
public void onCreate（）{
super.onCreate（）；
定时器=新定时器（）；
计时器计划（新的UpdateTimeTask（），01800000）//30分钟
}
类UpdateTimeTask扩展了TimerTask{
公开募捐{
sPref=GetSharedReferences（“MyPref”，模式为私有）；
String savedText=sPref.getString（已保存的文本“”）；
checker=sPref.getString（savedText，“0”）；
如果（数据新闻！=检查程序）{
asynk=新的MyAsynk（）；
asynk.execute（）；
createNotification（getApplicationContext（））；//ППццццццц
}否则{
asynk=新的MyAsynk（）；
asynk.execute（）；
}
}
}
类MyAsynk扩展了异步任务{
@凌驾
受保护的StringBuilder doInBackground（无效…无效）{
StringBuilder StringBuilder=新的StringBuilder（）；
字符串键=“0aa2713d5a1a4aad9a914c9294f6a22b”；
试一试{
URL=新URL（“https://newsapi.org/v1/articles?source=the-next web&sortBy=最新&apiKey=“+key”）；
URLConnection uc=url.openConnection（）；
uc.connect（）；
BufferedInputStream in=新的BufferedInputStream（uc.getInputStream（））；
int-ch；
而（（ch=in.read（））！=-1）{
stringBuilder.append（（char）ch）；
}
}catch（异常e）{e.printStackTrace（）；}
返回stringBuilder；
}
@凌驾
PostExecute上受保护的void（StringBuilder StringBuilder）{
试一试{
JSONObject JSONObject=新的JSONObject（stringBuilder.toString（））；
JSONArray数组=jsonObject.getJSONArray（“文章”）；
对于（int i=0；i
是
服务
可以读取
共享参考
并可以发出通知

如果我理解正确，您需要在
MyAsynk
类的
onPostExecute
函数中创建通知

因此，您可以像这样尝试在
AsyncTask
中添加公共属性

class MyAsynk extends AsyncTask<Void,Void,StringBuilder> {

    public boolean showNotification;

    // .. Other functions
}

现在，在
MyAsynk
类的
onPostExecute
中，需要检查布尔值并相应地创建通知

@Override
protected void onPostExecute(StringBuilder stringBuilder) {
    try {
        JSONObject jsonObject = new JSONObject(stringBuilder.toString());
        JSONArray array = jsonObject.getJSONArray("articles");
        for (int i = 0; i < array.length(); i++) {
            JSONObject object = array.getJSONObject(i);
            String title = object.getString("title");
            String desc = object.getString("description");
            String newsdata = object.getString("publishedAt");
            datanews = newsdata;
            titlenotif = title;
            destnotif = desc;
        }

        // Create notification here on demand
        if(showNotification) createNotification(getApplicationContext);
    }
    catch (Exception e){e.printStackTrace();}
}

@覆盖
PostExecute上受保护的void（StringBuilder StringBuilder）{
试一试{
JSONObject JSONObject=新的JSONObject（stringBuilder.toString（））；
JSONArray数组=jsonObject.getJSONArray（“文章”）；
对于（int i=0；i@Override
protected void onPostExecute(StringBuilder stringBuilder) {
    try {
        JSONObject jsonObject = new JSONObject(stringBuilder.toString());
        JSONArray array = jsonObject.getJSONArray("articles");
        for (int i = 0; i < array.length(); i++) {
            JSONObject object = array.getJSONObject(i);
            String title = object.getString("title");
            String desc = object.getString("description");
            String newsdata = object.getString("publishedAt");
            datanews = newsdata;
            titlenotif = title;
            destnotif = desc;
        }

        // Create notification here on demand
        if(showNotification) createNotification(getApplicationContext);
    }
    catch (Exception e){e.printStackTrace();}
}