android: upload of pictures from facebook to fireabse returns 404

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  How can I get the fist most visible View inside a ScrollView while a user scrolls up or down (The first most visibleView here being the one on the edge where the ScrollView starts)?
• Preference custom subclass Kotlin

  I'd like to subclass Preference to create a custom preference item in Kotlin. I have had so many errors and searched for so many solutions that I don't think it would be effective for me to list them all here. Right now, I am unable to get the custom preference to inflate in the Preference screen. If I remove this custom preference from my preference screen, the rest of the preferences I have implemented (not shown here) are working fine. There are many similar seeming questions here, but none of the ones I've found directly deal with the issue of creating a Kotlin implementation of a custom preference.

  Please help me with a working example that you've tested that shows three things:

  1. custom_preference.xml
  2. CustomPreference.kt
  3. preference_screen.xml (Parent Preference screen to display custom preference)

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  custom_preference.xml

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      xmlns:app="http://schemas.android.com/apk/res-auto"
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  A class that extends Preference and includes the proper constructors.

  CustomPreference.kt

  package com.example.myApp
  
  import android.content.Context
  import android.support.v7.preference.Preference
  import android.support.v7.preference.PreferenceViewHolder
  import android.util.AttributeSet
  import com.example.myApp.R
  import com.example.myApp.R.layout.custom_preference
  
  class CustomPreference (context: Context,
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                              defStyleAttr: Int = R.attr.preferenceStyle,
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  The custom preference declaration in the PreferenceScreen.

  preference_screen.xml:

  <?xml version="1.0" encoding="utf-8"?>
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  The Firebase Function just do this:

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  I try with a "Lenovo Moto G5S Plus XT1805", Android 8.1.0 and I have no problem. Device recives notification, both when app is closed and when it is open. Good!

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  I try to add a request permission:

  <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
  

  but with no effect!

  Can someone help me?

  Thanks!
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  I am using the Facebook SDK 7.15.0 on iOS with Unity 2018.2.0f2 to track App Install. Unfortunately it doesn't capture anything.

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• Items duplication in recyclerview, used in fragment when data is fetched from firebase realtime database

  First of all, please do not mark this as duplicate

  I am creating a chat app using Kotlin in which a user sends and receives messages using firebase realtime database. Application fetches data perfectly and also send messages is working fine but items duplicate sometimes when message is sent. Recyclerview is inflated in a fragment.

  Following is the image of messages being duplicated :

  Single message "1" is duplicated three times.

  

  Following is my Fragment code (prepareList() is method where my firebase operations are being performed) :

  class HomeFragment : Fragment() {
  
  lateinit var recyclerView: RecyclerView
  lateinit var editText: EditText
  lateinit var imageView: ImageView
  lateinit var message : String
  var databaseReference: DatabaseReference? = null
  lateinit var list: MutableList<User_Message_Data>
  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                            savedInstanceState: Bundle?): View? {
      var view : View = inflater.inflate(R.layout.fragment_home, container, 
  false)
      initViews(view)
      sendUserMessage(view)
      prepareList(view)
      return view
  }
  
   private fun initViews(view : View){
     recyclerView = view.findViewById(R.id.message_list)
     editText = view.findViewById(R.id.edt_message)
     imageView = view.findViewById(R.id.btn_send_message)
     databaseReference = FirebaseDatabase.getInstance().getReference("Groups").child(getUserGroup(view)).child("Chat")
     list = ArrayList<User_Message_Data>()
   }
  
  private fun getUserGroup(view : View) : String {
      var pref = view.context.getSharedPreferences("user_group", Context.MODE_PRIVATE)
      return pref.getString("group_name", "none")
  }
  
  private fun prepareList(view : View){
      setLayoutManager(view)
      var adapter = Message_Adapter(list, view.context)
      recyclerView.adapter = adapter
      try {
          databaseReference?.addChildEventListener(object : ChildEventListener{
              override fun onCancelled(p0: DatabaseError) {
                  TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
              }
  
              override fun onChildMoved(p0: DataSnapshot, p1: String?) {
                  TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
              }
  
              override fun onChildChanged(p0: DataSnapshot, p1: String?) {
              }
  
              override fun onChildAdded(p0: DataSnapshot, p1: String?) {
                  var obj : User_Message_Data = p0.getValue(User_Message_Data::class.java)!!
                  list.add(obj)
                  adapter.notifyItemChanged(list.size)
                  adapter.notifyDataSetChanged()
                  setLayoutManager(view)
              }
  
              override fun onChildRemoved(p0: DataSnapshot) {
              }
          })
      } catch (e : Exception) {
          Toast.makeText(view.context, e.message.toString(), Toast.LENGTH_LONG).show()
      }
  }
  
  private fun sendUserMessage(view : View){
      imageView.setOnClickListener {
          if (!editText.text.toString().equals("") && editText.text.toString() != null) {
              message = editText.text.toString().trim()
              var map = HashMap<String, String>()
              var uri : Uri? = FirebaseAuth.getInstance().currentUser!!.photoUrl
              Log.i("image_uri", uri.toString())
              map["Sender_Name"] = FirebaseAuth.getInstance().currentUser!!.displayName.toString()
              map["Sender_Key"] = FirebaseAuth.getInstance().uid!!.toString()
              map["Sender_Image"] = FirebaseAuth.getInstance().currentUser!!.photoUrl.toString()
              map["Message"] = message
              databaseReference!!.push().setValue(map).addOnCompleteListener { task ->
                  if (!task.isSuccessful) {
                      Toast.makeText(view.context, task.exception!!.message.toString(), Toast.LENGTH_LONG).show()
                  }
              }
              editText.setText("")
          } else {
              editText.error = "Cannot be empty"
          }
      }
  }
  
  private fun setLayoutManager(view : View){
      var layout_manager = LinearLayoutManager(view.context)
      layout_manager.stackFromEnd = true
      recyclerView.layoutManager = layout_manager
  }
  }
  

  And following is my Adapter class :

  class Message_Adapter constructor(mList: List<User_Message_Data>, mContext: 
  Context) : RecyclerView.Adapter<Message_Adapter.holder>() {
  
  var list = mList
  var context = mContext
  
  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): holder {
      var inflater = LayoutInflater.from(parent.context)
      var view: View = inflater.inflate(R.layout.message_row_design, parent, false)
      return holder(view)
  }
  
  override fun getItemCount(): Int {
      return list.size
  }
  
  override fun getItemViewType(position: Int): Int {
      return position
  }
  
  override fun onBindViewHolder(holder: holder, position: Int) {
  
      var obj: User_Message_Data = list.get(position)
      Picasso.get().load(obj.Sender_Image.toString()).into(holder.imgSender)
      holder.txtUserName.text = obj.Sender_Name
      holder.txtMessage.text = obj.Message
      holder.txtMessage.requestFocus()
  
      if (obj.Sender_Key.equals(FirebaseAuth.getInstance().uid)) {
          holder.layout.gravity = Gravity.END
      }
  }
  
  inner class holder(view: View) : RecyclerView.ViewHolder(view) {
      var imgSender: CircleImageView = view.findViewById(R.id.imgSender)
      var txtUserName: TextView = view.findViewById(R.id.txtSenderName)
      var txtMessage: TextView = view.findViewById(R.id.txtMessage)
      var layout: LinearLayout = view.findViewById(R.id.message_parent_layout)
  }
  }
  
• Go to specific activity when notification received in closed application?

  Below is my code, it works perfectly while app is in background but it gets to splash screen when app is not in background;

   Intent resultIntent = null;
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      TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(getApplicationContext());
      taskStackBuilder.addNextIntentWithParentStack(resultIntent);
  
      PendingIntent resultPendingIntent = PendingIntent.getActivity(getApplicationContext(),
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              PendingIntent.FLAG_UPDATE_CURRENT);
  
      mBuilder = new NotificationCompat.Builder(getApplicationContext());
      mBuilder.setSmallIcon(R.drawable.yu_android);
      mBuilder.setContentTitle(title)
              .setContentText(message)
              .setAutoCancel(false)
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      mNotificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
  
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
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      if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
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          notificationChannel.setLightColor(Color.RED);
          notificationChannel.enableVibration(true);
          notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
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  We would like to get marketing cost from Facebook Marketing API (Insights API - https://developers.facebook.com/docs/marketing-api/insights) based on multiple filtering (date range, country, impression_device etc.).

  I can apply 1 filter at a time, e.g.:

  • "country": GET https://graph.facebook.com/v3.1/act_<ACCOUNT_ID>/insights?access_token=<ACCESS_TOKEN>&fields=["spend"]&time_range={"since":"YYYY-MM-DD","until":"YYYY-MM-DD"}&filtering=[{"field":"country","operator":"EQUAL","value":"GB"}]

  • "impression_device": GET https://graph.facebook.com/v3.1/act_<ACCOUNT_ID>/insights?access_token=<ACCESS_TOKEN>&fields=["spend"]&time_range={"since":"YYYY-MM-DD","until":"YYYY-MM-DD"}&filtering=[{field:"impression_device","operator":"IN","value":["iphone","ipad"]}]

  BUT can't apply both in one query, getting the next response:

  {
  "error": {
      "message": "Service temporarily unavailable",
      "type": "OAuthException",
      "is_transient": false,
      "code": 2,
      "error_subcode": 1504018,
      "error_user_title": "Your request timed out",
      "error_user_msg": "Please try a smaller date range, fetch less data, or use async jobs",
      "fbtrace_id": "ADKphoammbM"
    }
  }
  

  I also tried to run report as async job (by making POST request as described here - https://developers.facebook.com/docs/marketing-api/insights/best-practices/#asynchronous), job is successfully started:

  {
  "id": "317371612321115",
  "account_id": "<ACCOUNT_ID>",
  "time_ref": 1545121794,
  "async_status": "Job Started",
  "async_percent_completion": 0,
  "is_running": true,
  "date_start": "2018-12-17",
  "date_stop": "2018-12-17"
  }
  

  But then got "job failed" status:

  {
  "id": "317371612321115",
  "account_id": "<ACCOUNT_ID>",
  "time_ref": 1545121794,
  "async_status": "Job Failed",
  "async_percent_completion": 0,
  "date_start": "2018-12-17",
  "date_stop": "2018-12-17"
  }
  

  Is it possible to apply multiple filters as I described below?
  Do some limits or docs how to apply multiple filters exist?
  Thank you.
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• Issue getting Firebase Image url using java -maven code [Not android]

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  Right Now I am using gsutil: Google cloud storage SDK using below code

  Storage storage = StorageOptions.getDefaultInstance()
           .getService();
   Bucket bucket = storage.get(bucketName);
  
   //... code required
  
  return "gs://" + blobId.getBucket() + "/" + blobId.getName();
  

  But above code is giving me gsutil URL which is not usable in HTML img src.

  I want firebase URL which can be used in HTML img tag.

  In shor I want download URL using Java-Spring code(not android).
• How to call an attribute of a private class outside it?

  I'm making an Android application and i'm trying to get the DownloadURL of an image stored in my Firebase Storage, here's my function:

  FUNCTION:

  if(imageUri != null){
      StorageReference fileReference = storageReference.child(System.currentTimeMillis()+"."+getFileExtension(imageUri));
      fileReference.putFile(imageUri).continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>(){
          @Override
          public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception{
              if(!task.isSuccessful()){
                  throw task.getException();
              }
              return storageReference.getDownloadUrl();
           }
      }).addOnCompleteListener(new OnCompleteListener<Uri>(){
          @Override
          public void onComplete(@NonNull Task<Uri> task){
              if(task.isSuccessful()){
                  Uri downloadUri = task.getResult();
                  u.setImageURL(downloadUri.toString());
                  Toast.makeText(TelaRegistro.this, u.getImageURL(), Toast.LENGTH_LONG).show();
              }else{
                  u.setImageURL("Sem imagem!");
              }
          }
      });
  }else{
      u.setImageURL("Sem imagem!");
  }
  

  PROBLEM:

  The problem is that when I call the method on the line below, it comes with value.

  Uri downloadUri = task.getResult();
  u.setImageURL(downloadUri.toString());
  Toast.makeText(TelaRegistro.this, u.getImageURL(), Toast.LENGTH_LONG).show();
  

  But when I try to call Get again it returns with null value, as is the case with the line below.

  Toast.makeText(TelaRegistro.this, u.getImageURL(), Toast.LENGTH_LONG).show();
  

  I'm a beginner programmer and I've been trying to solve this for a few days, I do not know what else to do. Could you help me?
• How to properly get images using Firebase and an adapter with RecyclerView

  I am trying to set a RecyclerView with image view and text view (representing the user id and the the user image). This is my code for the OnBindViewHolder:

  @Override
      public void onBindViewHolder(MyViewHolder holder, int position) {
          myHolder = holder;           
          User user = mDataset.get(position);
          myHolder.userNameTextView.setText(user.getUsername());
  
          StorageReference storageReference = FirebaseStorage.getInstance().getReference();
          storageReference.child("profileImages").child(user.getUsername()).getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
              @Override
              public void onSuccess(Uri uri) {
                  // Got the download URL
                  Glide.with(myHolder.itemView.getContext() /* context */)
                          .load(uri)
                          .apply(new RequestOptions().override(300, 300))
                          .into(myHolder.userProfileImage);
  
              }
          }).addOnFailureListener(new OnFailureListener() {
              @Override
              public void onFailure(@NonNull Exception exception) {
                  // Handle any errors
  
              }
          });
  

  and from the activity I add data:

     ArrayList<User> myDataset = new ArrayList<User>();
      myDataset.add(new User("ga45I6ThhjP1JZzn4r3KoQ6Z4oA3"));
      myDataset.add(new User("bSM5G7PAdztPj54j3iql333n9hs1"));
      myDataset.add(new User("5433ffdsdggv3OSykUIFgFS3Zr832"));
      myDataset.add(new User("123sdSDvQfZxKYSQsIgRlqbq1Z3433"));
  
      mAdapter = new MyAdapter(myDataset);
      mRecyclerView.setAdapter(mAdapter);
  

  But, there are awkward problems. For example: sometimes the images will not load, only the place holder remains. Sometimes it loads the wrong image into the place holder. Sometimes it loads same image in more than one place. It also randomly changes the images. However, the user id is always correct in the list and never changes (The order of the user ids is always correct). I'm afraid it has something to do with it being async operation. So how to make sure I always get the correct image for the correct user id?

  What is the correct way to match the correct image view to its holder in the right position using Firebase storage with this async Uri request? I can't get it to work!