Android 9 Development Cookbook - Third Edition

Multipart messages

Although it can vary depending on the carrier, 160 is typically the maximum characters allowed per text message. You could modify the preceding code to check whether the message exceeds 160 characters, and if so, you can call the SMSManager divideMessage() method. The method returns ArrayList, which you can send to sendMultipartTextMessage(). Here's an example:

ArrayList<String> messages=smsManager.divideMessage(msg);smsManager.sendMultipartTextMessage(phoneNumber, null, messages, null, null);

Note that messages sent with sendMultipartTextMessage() may not work correctly when using an emulator, so be sure to test on a real device.