TDLightTelegramBots/TelegramBots.wiki/FAQ.md

* [How to get picture?](#how_to_get_picture)
* [How to display ChatActions like "typing" or "recording a voice message"?](#how_to_sendchataction)
* [How to send photos?](#how_to_send_photos)
* [How do I send photos by file_id?](#how_to_send_photos_file_id)
* [How to send stickers?](#how_to_send_stickers)
* [How to use custom keyboards?](#how_to_use_custom_keyboards)
* [How can I run my bot?](#how_to_host)
* [How can I compile my project?](#how_to_compile)
* [Method ```sendMessage()``` (or other) is deprecated, what should I do?](#sendmessage_deprecated)
* [Is there any example for WebHook?](#example_webhook)
* [How to use spring boot starter?](#spring_boot_starter)

## <a id="how_to_get_picture"></a>How to download photo? ##

To download a picture (or any other file), you will need the `file_path` of the file. Let start by finding the photo we want to download, the following method will extract the `PhotoSize` from a photo sent to the bot (in our case, we are taken the bigger size of those provided):

```java
public PhotoSize getPhoto(Update update) {
    // Check that the update contains a message and the message has a photo
    if (update.hasMessage() && update.getMessage().hasPhoto()) {
        // When receiving a photo, you usually get different sizes of it
        List<PhotoSize> photos = update.getMessage().getPhoto();

        // We fetch the bigger photo
        return photos.stream()
                .max(Comparator.comparing(PhotoSize::getFileSize)).orElse(null);
    }

    // Return null if not found
    return null;
}
```

Once we have the *photo* we have to options: The `file_path` is already present or we need to get it, the following method will handle both of them and return the final `file_path`:

```java
public String getFilePath(PhotoSize photo) {
    Objects.requireNonNull(photo);

    if (photo.hasFilePath()) { // If the file_path is already present, we are done!
        return photo.getFilePath();
    } else { // If not, let find it
        // We create a GetFile method and set the file_id from the photo
        GetFile getFileMethod = new GetFile();
        getFileMethod.setFileId(photo.getFileId());
        try {
            // We execute the method using AbsSender::execute method.
            File file = execute(getFileMethod);
            // We now have the file_path
            return file.getFilePath();
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
    
    return null; // Just in case
}
```

Now that we have the `file_path` we can download it:

```java
public java.io.File downloadPhotoByFilePath(String filePath) {
    try {
        // Download the file calling AbsSender::downloadFile method
        return downloadFile(filePath);
    } catch (TelegramApiException e) {
        e.printStackTrace();
    }

    return null;
}
```

The returned `java.io.File` object will be your photo

## <a id="how_to_sendchataction"></a>How to display ChatActions like "typing" or "recording a voice message"? ##
Quick example here that is showing ChactActions for commands like "/type" or "/record_audio"

```java
if (update.hasMessage() && update.getMessage().hasText()) {

    String text = update.getMessage().getText();

    SendChatAction sendChatAction = new SendChatAction();
    sendChatAction.setChatId(update.getMessage().getChatId());

    if (text.equals("/type")) {
        // -> "typing"
        sendChatAction.setAction(ActionType.TYPING);
        // -> "recording a voice message"
    } else if (text.equals("/record_audio")) {
        sendChatAction.setAction(ActionType.RECORDAUDIO);
    } else {
        // -> more actions in the Enum ActionType
        // For information: https://core.telegram.org/bots/api#sendchataction
        sendChatAction.setAction(ActionType.UPLOADDOCUMENT);
    }

    try {
        Boolean wasSuccessfull = execute(sendChatAction);
    } catch (TelegramApiException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
```

## <a id="how_to_send_photos"></a>How to send photos? ##

There are several methods to send a photo to an user using `sendPhoto` method: With a `file_id`, with an `url` or uploading the file. In this example, we assume that we already have the *chat_id* where we want to send the photo:

```java
    public void sendImageFromUrl(String url, String chatId) {
        // Create send method
        SendPhoto sendPhotoRequest = new SendPhoto();
        // Set destination chat id
        sendPhotoRequest.setChatId(chatId);
        // Set the photo url as a simple photo
        sendPhotoRequest.setPhoto(new InputFile(url));
        try {
            // Execute the method
            execute(sendPhotoRequest);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }

    public void sendImageFromFileId(String fileId, String chatId) {
        // Create send method
        SendPhoto sendPhotoRequest = new SendPhoto();
        // Set destination chat id
        sendPhotoRequest.setChatId(chatId);
        // Set the photo url as a simple photo
        sendPhotoRequest.setPhoto(new InputFile(fileId));
        try {
            // Execute the method
            execute(sendPhotoRequest);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }

    public void sendImageUploadingAFile(String filePath, String chatId) {
        // Create send method
        SendPhoto sendPhotoRequest = new SendPhoto();
        // Set destination chat id
        sendPhotoRequest.setChatId(chatId);
        // Set the photo file as a new photo (You can also use InputStream with a constructor overload)
        sendPhotoRequest.setPhoto(new InputFile(new File(filePath)));
        try {
            // Execute the method
            execute(sendPhotoRequest);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
```
## <a id="how_to_send_stickers"></a>How to send stickers? ##

There are several ways to send a sticker, but now we will use `file_id` and `url`.

`file_id`: To get the *file_id*, you have to send your sticker to the [**Get Sticker ID**](https://t.me/idstickerbot?do=open_link) bot and then you will receive a string.
`url`: All you need to have is an link to the sticker in `.webp` format, like [**This**](https://www.gstatic.com/webp/gallery/5.webp).
#### Implementation
Just call the method below in your `onUpdateReceived(Update update)` method.
```java
// Sticker_file_id is received from @idstickerbot bot  
	private void StickerSender(Update update, String Sticker_file_id) { 
 //the ChatId that  we received form Update class  
	String ChatId = update.getMessage().getChatId().toString();  
  // Create an InputFile containing Sticker's file_id or URL  
	InputFile StickerFile = new InputFile(Sticker_file_id);  
  // Create a SendSticker object using the ChatId and StickerFile  
	SendSticker TheSticker = new SendSticker(ChatId, StickerFile); 
	 
  // Will reply the sticker to the message sent  
   //TheSticker.setReplyToMessageId(update.getMessage().getMessageId());  
   
  try {  // Execute the method
        execute(TheSticker);  
  } catch (TelegramApiException e) {  
        e.printStackTrace();  
  }  
}
```
## <a id="how_to_send_photos_file_id"></a>How to send photo by its file_id? ##

In this example we will check if user sends to bot a photo, if it is, get Photo's file_id and send this photo by file_id to user.
```java
// If it is a photo
if (update.hasMessage() && update.getMessage().hasPhoto()) {
    // Array with photos
    List<PhotoSize> photos = update.getMessage().getPhoto();
    // Get largest photo's file_id
    String f_id = photos.stream()
            .max(Comparator.comparing(PhotoSize::getFileSize))
            .orElseThrow().getFileId();
    // Send photo by file_id we got before
    SendPhoto msg = new SendPhoto()
            .setChatId(update.getMessage().getChatId())
            .setPhoto(new InputFile(f_id))
            .setCaption("Photo");
    try {
        execute(msg); // Call method to send the photo
    } catch (TelegramApiException e) {
        e.printStackTrace();
    }
}
```

## <a id="how_to_use_custom_keyboards"></a>How to use custom keyboards? ##

Custom keyboards can be appended to messages using the `setReplyMarkup`. In this example, we will build a simple [ReplyKeyboardMarkup](https://core.telegram.org/bots/api#replykeyboardmarkup) with two rows and three buttons per row, but you can also use other types like [ReplyKeyboardHide](https://core.telegram.org/bots/api#replykeyboardhide), [ForceReply](https://core.telegram.org/bots/api#forcereply) or [InlineKeyboardMarkup](https://core.telegram.org/bots/api#inlinekeyboardmarkup): 

```java
    public void sendCustomKeyboard(String chatId) {
        SendMessage message = new SendMessage();
        message.setChatId(chatId);
        message.setText("Custom message text");

        // Create ReplyKeyboardMarkup object
        ReplyKeyboardMarkup keyboardMarkup = new ReplyKeyboardMarkup();
        // Create the keyboard (list of keyboard rows)
        List<KeyboardRow> keyboard = new ArrayList<>();
        // Create a keyboard row
        KeyboardRow row = new KeyboardRow();
        // Set each button, you can also use KeyboardButton objects if you need something else than text
        row.add("Row 1 Button 1");
        row.add("Row 1 Button 2");
        row.add("Row 1 Button 3");
        // Add the first row to the keyboard
        keyboard.add(row);
        // Create another keyboard row
        row = new KeyboardRow();
        // Set each button for the second line
        row.add("Row 2 Button 1");
        row.add("Row 2 Button 2");
        row.add("Row 2 Button 3");
        // Add the second row to the keyboard
        keyboard.add(row);
        // Set the keyboard to the markup
        keyboardMarkup.setKeyboard(keyboard);
        // Add it to the message
        message.setReplyMarkup(keyboardMarkup);

        try {
            // Send the message
            execute(message);
        } catch (TelegramApiException e) {
            e.printStackTrace();
        }
    }
```

[InlineKeyboardMarkup](https://core.telegram.org/bots/api#inlinekeyboardmarkup) use list to capture the buttons instead of KeyboardRow.

```java
   public void sendInlineKeyboard(String chatId) {
        SendMessage message = new SendMessage();
        message.setChatId(chatId);
        message.setText("Inline model below.");

        // Create InlineKeyboardMarkup object
        InlineKeyboardMarkup inlineKeyboardMarkup = new InlineKeyboardMarkup();
        // Create the keyboard (list of InlineKeyboardButton list)
        List<List<InlineKeyboardButton>> keyboard = new ArrayList<>();
        // Create a list for buttons
        List<InlineKeyboardButton> Buttons = new ArrayList<InlineKeyboardButton>();
        // Initialize each button, the text must be written
        InlineKeyboardButton youtube= new InlineKeyboardButton("youtube");
        // Also must use exactly one of the optional fields,it can edit  by set method
        youtube.setUrl("https://www.youtube.com");
        // Add button to the list
        Buttons.add(youtube);
        // Initialize each button, the text must be written
        InlineKeyboardButton github= new InlineKeyboardButton("github");
        // Also must use exactly one of the optional fields,it can edit  by set method
        github.setUrl("https://github.com");
        // Add button to the list
        Buttons.add(github);
        keyboard.add(Buttons);
        inlineKeyboardMarkup.setKeyboard(keyboard);
        // Add it to the message
        message.setReplyMarkup(inlineKeyboardMarkup);

        try {
        // Send the message
        execute(message);
        } catch (TelegramApiException e) {
        e.printStackTrace();
        }
        }
```

## <a id="how_to_host"></a>How can I run my bot? ##

You don't need to spend a lot of money into hosting your own telegram bot. Basically, there are two options around how to host:
   
   1. Hosting on your own hardware. It can be a Mini-PC like a Raspberry Pi. The costs for the hardware (~35€) and annual costs for power (~7-8€) are low. Keep in mind that your internet connection might be limited and a Mini-Pc is not ideal for a large users base.
   2. Run your bot in a Virtual Server/dedicated root server. There are many hosters out there that are providing cheap servers that fit your needs. The cheapest one should be openVZ-Containers or a KVM vServer. Example providers are [Hetzner](https://www.hetzner.de/ot/), [DigitalOcean](https://www.digitalocean.com/),  (are providing systems that have a high availability but cost's a bit more) and [OVH](https://ovh.com)
For a deeper explanation for deploying your bot on DigitalOcean please see the [Lesson 5. Deploy your bot](https://monsterdeveloper.gitbooks.io/writing-telegram-bots-on-java/content/lesson-5.-deploy-your-bot.html) chapter in [MonsterDeveloper](https://github.com/MonsterDeveloper)'s book

## <a id="how_to_compile"></a>How can I compile my project? ##

This is just one way, how you can compile it (here with maven). The example below below is compiling the TelegramBotsExample repo. 
   [![asciicast](https://asciinema.org/a/4np9i2u9onuitkg287ism23kj.png)](https://asciinema.org/a/4np9i2u9onuitkg287ism23kj)
   
## <a id="sendmessage_deprecated"></a>Method ```sendMessage()``` (or other) is deprecated, what should I do? ##
Please use ```execute()``` instead. 
Example:
```java
SendMessage message = new SendMessage();
//add chat id and text
execute(message);
```

If you extend ```TelegramLongPollingCommandBot```, then use ```AbsSender.execute()``` instead.


## <a id="example_webhook"></a>Is there any example for WebHook? ##
Please see the example Bot for https://telegram.me/SnowcrashBot in the [TelegramBotsExample]() repo and also an [example bot for Sping Boot](https://github.com/UnAfraid/SpringTelegramBot) from [UnAfraid](https://github.com/UnAfraid) [here](https://github.com/UnAfraid/SpringTelegramBot/blob/master/src/main/java/com/github/unafraid/spring/bot/TelegramWebHookBot.java)



## <a id="spring_boot_starter"></a>How to use spring boot starter ##
----------
Your main spring boot class should look like this:

```java
@SpringBootApplication
public class YourApplicationMainClass {

    public static void main(String[] args) {
        SpringApplication.run(YourApplicationMainClass.class, args);
    }
}
```

After that your bot will look like:
```java
  //Standard Spring component annotation
  @Component
  public class YourBotClassName extends TelegramLongPollingBot {
    //Bot body.
  }
```
Also you could just implement LongPollingBot or WebHookBot interfaces. All this bots will be registered in context and connected to Telegram api.