How to send message on WhatsApp in Android

Whatsapp is the one of most popular messaging App. Many android applications need the functionality to share some messages directly from their app to WhatsApp. For example, if a user wants to share the app or share a message from the app then this functionality comes in use. Either user can send a text or a predefined text can also be sent through this. This article demonstrates how an android application can send messages on WhatsApp. Whatsapp must be installed on the user's device.

Approach

Step 1:Open the activity_main.xml file and add the layout code. A message input container as EditText and a Button to send this message is added.

Step 2: Take the reference of EditText and Button in Java file. References are taken using the ids with the help of findViewById() method.

• Taking reference to EditText

  EditText messageEditText = findViewById(R.id.message);

• Taking reference to Button

  Button submit = findViewById(R.id.submit);

Step 3: Write function to send message to whatsapp. Create an intent with ACTION_SEND and specify the whatsapp package name to this so that it opens whatsapp directly.

com.whatsapp is the package name for official whatsapp application.

Step 4: Set onClickListener to the button. It takes the text entered by the user and calls the function sendMessage in which the text message is sent as a parameter.

Below is the complete MainActivity.java file:

Output: