![]() You will create two new apps based on apps you created previously for the lesson about making phone calls: Request permission from the user, if necessary, to send SMS messages.Check for the SMS permission, which can change at any time.Create an app that sends SMS messages using the SmsManager class.Pass data (the phone number) and the message with the implicit intent.Create an app that uses an implicit intent to launch a messaging app.Extract an SMS message from an SMS event.Receive SMS events using a broadcast receiver.Check for the SMS permission, and request permission if necessary.Send an SMS message from within an app.Launch an SMS messaging app from your app with a phone number and message. ![]() Use a broadcast receiver to receive system events.Use an implicit intent to perform a function with another app.Create an onClick method for a button with the android:onClick attribute.To receive SMS messages, use the onReceive() method of the BroadcastReceiver class. You can manage SMS operations such as dividing a message into fragments, sending a multipart message, get carrier-dependent configuration values, and so on.The user stays in your app during and after sending the message.Your app must ask the user for permission before sending the SMS message, if the user hasn't already granted permission.This is a good choice for sending messages from your app without having to use another installed app.Send the SMS message using the sendTextMessage() method or other methods of the SmsManager class.The user navigates back to your app using the Back button.The user can change the message in the messaging app before sending it. ![]() (Android smartphones will have at least one, such as Messenger.) If the user has multiple SMS messaging apps installed on the Android phone, the App chooser will appear with a list of these apps, and the user can choose which one to use.Your app doesn't need code to request permission from the user.The user can add a picture or other attachment in the messaging app, if the messaging app supports adding attachments. ![]()
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