Hello,
I currently have an app that receives news articles with a volley and is
constantly updated. I want the app to send a notification to the user when
a new article is posted. So far I have this code in my response listener
but I'm not sure if it's in the right place or if it is detecting a new
news article.
Any help would be useful as i'm new to android development!
public class MainActivity extends AppCompatActivity {
private List<NewsRecord> newsListData = new ArrayList<NewsRecord>();
private GridView newsListView;
private NewsListAdapter adapter;
LinearLayout layout;
List<String> stringValues;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
layout = (LinearLayout) findViewById(R.id.progressbar_view);
GridView newsListView = (GridView) findViewById(R.id.newsFeedList);
adapter = new NewsListAdapter(this, R.layout.adapter_news_list,
newsListData, this);
newsListView.setAdapter(adapter);
newsListView.setOnItemClickListener(itemClicked);
nextStart = 0;
updateListData(nextStart, 20);
}
class Task extends AsyncTask<String, Integer, Boolean> {
@Override
protected void onPreExecute() {
layout.setVisibility(View.VISIBLE);
newsListView.setVisibility(View.GONE);
super.onPreExecute();
}
@Override
protected void onPostExecute(Boolean result) {
layout.setVisibility(View.GONE);
newsListView.setVisibility(View.VISIBLE);
adapter.notifyDataSetChanged();
super.onPostExecute(result);
}
@Override
protected Boolean doInBackground(String... params) {
stringValues.add("String 1");
stringValues.add("String 2");
stringValues.add("String 3");
stringValues.add("String 4");
stringValues.add("String 5");
try {
Thread.sleep(3000);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
public int nextStart = 0;
public void updateListData(int StartPoint, int count){
String url =
"http://www.efstratiou.info/projects/newsfeed/getList.php?start="; + StartPoint
+ "&count=" + count;
EDANewsApp app = EDANewsApp.getInstance();
JsonArrayRequest jsonRequest = new JsonArrayRequest(url, listener,
errorListener);
app.requestQueue.add(jsonRequest);
nextStart +=count;
}
@Override
public boolean onCreateOptionsMenu (Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_menu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case R.id.action_about:
Intent intent = new Intent(this, AboutActivity.class);
startActivity(intent);
return true;
case R.id.action_search:
return true;
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
AdapterView.OnItemClickListener itemClicked = new
AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Intent intent = new Intent(MainActivity.this,
NewsItemActivity.class);
intent.putExtra("newsItemId", newsListData.get(position).recordId);
startActivity(intent);
}
};
//Listeners
Response.Listener<JSONArray> listener = new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//we successfully received the JSONArray
//Here we will extract the data and use it in our app
//Clear the dataset before loading new data
// newsListData.clear();
//Go through all the JSON objects
for (int i = 0; i < response.length(); i++) {
try {
//Get one JSON object
JSONObject jsonObj = response.getJSONObject(i);
//Put JSON data in a Java object
NewsRecord record = new NewsRecord();
record.recordId = jsonObj.getInt("record_id");
record.title = jsonObj.getString("title");
record.date = jsonObj.getString("date");
record.shortInfo = jsonObj.getString("short_info");
record.imageUrl = jsonObj.getString("image_url");
newsListData.add(record);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_search_white_24dp)
.setContentTitle("New Post!")
.setContentText("Click to view new articles");
Intent resultIntent = new Intent(this, MainActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager)
getSystemService(Context.NOTIFICATION_SERVICE);
// first element (0) allows you to update the notification later on.
mNotificationManager.notify(0, mBuilder.build());
}
};
Response.ErrorListener errorListener = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//There was an error in the communication
//We can notify the user about it
}
};
}
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