Sending Message Through Whatsapp

Sending message through WhatsApp

UPDATE
Please refer to https://faq.whatsapp.com/en/android/26000030/?category=5245251

WhatsApp's Click to Chat feature allows you to begin a chat with
someone without having their phone number saved in your phone's
address book. As long as you know this person’s phone number, you can
create a link that will allow you to start a chat with them.

Use: https://wa.me/15551234567

Don't use: https://wa.me/+001-(555)1234567

Example: https://wa.me/15551234567?text=I'm%20interested%20in%20your%20car%20for%20sale

Original answer
Here is the solution

public void onClickWhatsApp(View view) {
    
    PackageManager pm=getPackageManager();
    try {

        Intent waIntent = new Intent(Intent.ACTION_SEND);
        waIntent.setType("text/plain");
        String text = "YOUR TEXT HERE";

        PackageInfo info=pm.getPackageInfo("com.whatsapp", PackageManager.GET_META_DATA);
        //Check if package exists or not. If not then code 
        //in catch block will be called
        waIntent.setPackage("com.whatsapp");

        waIntent.putExtra(Intent.EXTRA_TEXT, text);
        startActivity(Intent.createChooser(waIntent, "Share with"));
        
   } catch (NameNotFoundException e) {
        Toast.makeText(this, "WhatsApp not Installed", Toast.LENGTH_SHORT)
                .show();
   }  

}

Also see http://www.whatsapp.com/faq/en/android/28000012

Send text to specific contact programmatically (whatsapp)

This is now possible through the WhatsApp Business API. Only businesses may apply to use it. This is the only way to directly send messages to phone numbers, without any human interaction.

Sending normal messages is free. It looks like you need to host a MySQL database and the WhatsApp Business Client on your server.

How to send whatsapp message in whatsapp-web.js

Here is how I send messages in whatsapp-web.js.

const number = "9830121234";
const sanitized_number = number.toString().replace(/[- )(]/g, ""); // remove unnecessary chars from the number
const final_number = `91${sanitized_number.substring(sanitized_number.length - 10)}`; // add 91 before the number here 91 is country code of India

const number_details = await client.getNumberId(final_number); // get mobile number details

if (number_details) {
    const sendMessageData = await client.sendMessage(number_details._serialized, sendData.message); // send message
} else {
    console.log(final_number, "Mobile number is not registered");
}

.

.

update (for await is valid inside only async error):

if you are using this method in any event you should put it inside an async function

on.any_kind_of_event(async function () {
    const number = "9830121234";
    const sanitized_number = number.toString().replace(/[- )(]/g, ""); // remove unnecessary chars from the number
    const final_number = `91${sanitized_number.substring(sanitized_number.length - 10)}`; // add 91 before the number here 91 is country code of India

    const number_details = await client.getNumberId(final_number); // get mobile number details

    if (number_details) {
        const sendMessageData = await client.sendMessage(number_details._serialized, sendData.message); // send message
    } else {
        console.log(final_number, "Mobile number is not registered");
    }
});

Mobile website WhatsApp button to send message to a specific number

Format to send a WhatsApp message to a specific number (updated Nov 2018)

<a href="https://wa.me/whatsappphonenumber/?text=urlencodedtext"></a>

where

whatsappphonenumber is a full phone number in international format

urlencodedtext is the URL-encoded pre-filled message.

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Example:

1. Create a link with a pre-filled message that will
   automatically appear in the text field of a chat, to be sent to a specific number

   Send I am interested in your car for sale to +001-(555)1234567

   https://wa.me/15551234567?text=I%20am%20interested%20in%20your%20car%20for%20sale

   Note :

   Use: https://wa.me/15551234567

   Don't use: https://wa.me/+001-(555)1234567

2. Create a link with just a pre-filled message that will
   automatically appear in the text field of a chat, number will be chosen by the user

   Send I am enquiring about the apartment listing

   https://wa.me/?text=I%20am%20enquiring%20about%20the%20apartment%20listing

   After clicking on the link, user will be shown a list of contacts they
   can send the pre-filled message to.

For more information, see https://www.whatsapp.com/faq/en/general/26000030

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P.S : Older format (before updation) for reference

<a href="https://api.whatsapp.com/send?phone=whatsappphonenumber&text=urlencodedtext"></a>

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