How to launch Telegram app from my own android application?

To solve this problem you have to open robot id with this :

Intent telegram = new Intent(Intent.ACTION_VIEW , Uri.parse("https://telegram.me/InfotechAvl_bot"));
startActivity(telegram);

for Instagram and Telegram and WhatsApp you can use this methods

 void getTelegram(){

        try {
            Intent telegramIntent = new Intent(Intent.ACTION_VIEW);
            telegramIntent.setData(Uri.parse("https://telegram.me/diako099"));
            startActivity(telegramIntent);
        } catch (Exception e) {
            // show error message
        }
    }

    void getInstagram(){
        try {
            Intent instagramIntent = new Intent(Intent.ACTION_VIEW);
            instagramIntent.setData(Uri.parse("https://www.instagram.com/diako_hasani99/"));
            startActivity(instagramIntent);
        } catch (Exception e) {
            // show error message
        }

    }

    void getWhatsApp(){
        try{

            String trimToNumner = "+989180074693"; //10 digit number
            Intent intent = new Intent ( Intent.ACTION_VIEW );
            intent.setData ( Uri.parse ( "https://wa.me/" + trimToNumner + "/?text=" + "" ) );
            startActivity ( intent );

        }catch (Exception e){

        }
    }