private void switchToPreviousMessage() {
   if (NotificationsController.getInstance().popupMessages.size() > 1) {
     if (currentMessageNum > 0) {
       currentMessageNum--;
     } else {
       currentMessageNum = NotificationsController.getInstance().popupMessages.size() - 1;
     }
     currentMessageObject =
         NotificationsController.getInstance().popupMessages.get(currentMessageNum);
     updateInterfaceForCurrentMessage(1);
     countText.setText(
         String.format(
             "%d/%d",
             currentMessageNum + 1, NotificationsController.getInstance().popupMessages.size()));
   }
 }
  private void getNewMessage() {
    if (NotificationsController.getInstance().popupMessages.isEmpty()) {
      onFinish();
      finish();
      return;
    }

    boolean found = false;
    if ((currentMessageNum != 0 || chatActivityEnterView.hasText() || startedMoving)
        && currentMessageObject != null) {
      for (int a = 0; a < NotificationsController.getInstance().popupMessages.size(); a++) {
        if (NotificationsController.getInstance().popupMessages.get(a).getId()
            == currentMessageObject.getId()) {
          currentMessageNum = a;
          found = true;
          break;
        }
      }
    }
    if (!found) {
      currentMessageNum = 0;
      currentMessageObject = NotificationsController.getInstance().popupMessages.get(0);
      updateInterfaceForCurrentMessage(0);
    } else if (startedMoving) {
      if (currentMessageNum == NotificationsController.getInstance().popupMessages.size() - 1) {
        prepareLayouts(3);
      } else if (currentMessageNum == 1) {
        prepareLayouts(4);
      }
    }
    countText.setText(
        String.format(
            "%d/%d",
            currentMessageNum + 1, NotificationsController.getInstance().popupMessages.size()));
  }
  private ViewGroup getViewForMessage(int num, boolean applyOffset) {
    if (NotificationsController.getInstance().popupMessages.size() == 1
        && (num < 0 || num >= NotificationsController.getInstance().popupMessages.size())) {
      return null;
    }
    if (num == -1) {
      num = NotificationsController.getInstance().popupMessages.size() - 1;
    } else if (num == NotificationsController.getInstance().popupMessages.size()) {
      num = 0;
    }
    ViewGroup view;
    MessageObject messageObject = NotificationsController.getInstance().popupMessages.get(num);
    if (messageObject.type == 1 || messageObject.type == 4) {
      if (imageViews.size() > 0) {
        view = imageViews.get(0);
        imageViews.remove(0);
      } else {
        view = new FrameLayoutAnimationListener(this);
        view.addView(getLayoutInflater().inflate(R.layout.popup_image_layout, null));
        view.setTag(2);

        view.setOnClickListener(
            new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                openCurrentMessage();
              }
            });
      }

      TextView messageText = (TextView) view.findViewById(R.id.message_text);
      BackupImageView imageView = (BackupImageView) view.findViewById(R.id.message_image);
      imageView.setAspectFit(true);

      if (messageObject.type == 1) {
        TLRPC.PhotoSize currentPhotoObject =
            FileLoader.getClosestPhotoSizeWithSize(
                messageObject.photoThumbs, AndroidUtilities.getPhotoSize());
        TLRPC.PhotoSize thumb =
            FileLoader.getClosestPhotoSizeWithSize(messageObject.photoThumbs, 100);
        boolean photoSet = false;
        if (currentPhotoObject != null) {
          boolean photoExist = true;
          if (messageObject.type == 1) {
            File cacheFile = FileLoader.getPathToMessage(messageObject.messageOwner);
            if (!cacheFile.exists()) {
              photoExist = false;
            }
          }
          if (photoExist
              || MediaController.getInstance()
                  .canDownloadMedia(MediaController.AUTODOWNLOAD_MASK_PHOTO)) {
            imageView.setImage(
                currentPhotoObject.location, "100_100", thumb.location, currentPhotoObject.size);
            photoSet = true;
          } else {
            if (thumb != null) {
              imageView.setImage(thumb.location, null, (Drawable) null);
              photoSet = true;
            }
          }
        }
        if (!photoSet) {
          imageView.setVisibility(View.GONE);
          messageText.setVisibility(View.VISIBLE);
          messageText.setTextSize(
              TypedValue.COMPLEX_UNIT_SP, MessagesController.getInstance().fontSize);
          messageText.setText(messageObject.messageText);
        } else {
          imageView.setVisibility(View.VISIBLE);
          messageText.setVisibility(View.GONE);
        }
      } else if (messageObject.type == 4) {
        messageText.setVisibility(View.GONE);
        messageText.setText(messageObject.messageText);
        imageView.setVisibility(View.VISIBLE);
        double lat = messageObject.messageOwner.media.geo.lat;
        double lon = messageObject.messageOwner.media.geo._long;
        String currentUrl =
            String.format(
                Locale.US,
                "https://maps.googleapis.com/maps/api/staticmap?center=%f,%f&zoom=13&size=100x100&maptype=roadmap&scale=%d&markers=color:red|size:big|%f,%f&sensor=false",
                lat,
                lon,
                Math.min(2, (int) Math.ceil(AndroidUtilities.density)),
                lat,
                lon);
        imageView.setImage(currentUrl, null, null);
      }
    } else if (messageObject.type == 2) {
      PopupAudioView cell;
      if (audioViews.size() > 0) {
        view = audioViews.get(0);
        audioViews.remove(0);
        cell = (PopupAudioView) view.findViewWithTag(300);
      } else {
        view = new FrameLayoutAnimationListener(this);
        view.addView(getLayoutInflater().inflate(R.layout.popup_audio_layout, null));
        view.setTag(3);

        view.setOnClickListener(
            new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                openCurrentMessage();
              }
            });

        ViewGroup audioContainer = (ViewGroup) view.findViewById(R.id.audio_container);
        cell = new PopupAudioView(this);
        cell.setTag(300);
        audioContainer.addView(cell);
      }

      cell.setMessageObject(messageObject);
      if (MediaController.getInstance().canDownloadMedia(MediaController.AUTODOWNLOAD_MASK_AUDIO)) {
        cell.downloadAudioIfNeed();
      }
    } else {
      if (textViews.size() > 0) {
        view = textViews.get(0);
        textViews.remove(0);
      } else {
        view = new FrameLayoutAnimationListener(this);
        view.addView(getLayoutInflater().inflate(R.layout.popup_text_layout, null));
        view.setTag(1);

        View textContainer = view.findViewById(R.id.text_container);
        textContainer.setOnClickListener(
            new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                openCurrentMessage();
              }
            });
      }
      TextView messageText = (TextView) view.findViewById(R.id.message_text);
      messageText.setTag(301);
      messageText.setTextSize(
          TypedValue.COMPLEX_UNIT_SP, MessagesController.getInstance().fontSize);
      messageText.setText(messageObject.messageText);
    }
    if (view.getParent() == null) {
      messageContainer.addView(view);
    }
    view.setVisibility(View.VISIBLE);

    if (applyOffset) {
      int widht = AndroidUtilities.displaySize.x - AndroidUtilities.dp(24);
      FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view.getLayoutParams();
      layoutParams.gravity = Gravity.TOP | Gravity.LEFT;
      layoutParams.height = ViewGroup.LayoutParams.MATCH_PARENT;
      layoutParams.width = widht;
      if (num == currentMessageNum) {
        layoutParams.leftMargin = 0;
      } else if (num == currentMessageNum - 1) {
        layoutParams.leftMargin = -widht;
      } else if (num == currentMessageNum + 1) {
        layoutParams.leftMargin = widht;
      }
      view.setLayoutParams(layoutParams);
      view.invalidate();
    }

    return view;
  }