![]() The following code demonstrates how to perform an implicit intent to send a message: public void smsSendMessage(View view) , The SMS app opens with the supplied phone number and message, enabling the user to tap a button to send the message, or change the number and message before sending. If the user has several SMS messaging apps, the user can choose which one to open. Tip: The "smsto:" prefix with ACTION_SENDTO ensures that your intent is handled only by a text messaging app (and not by other email or social apps). ![]() Use an implicit intent with ACTION_SENDTO to pass the phone number to the SMS app, and set the phone number and message for the intent with setData() and putExtra. ![]() In the smsSendMessage() method, you would convert the phone number to a string prefixed by "smsto:" (as in smsto:14155551212). To call a method such as smsSendMessage() that would launch a messaging app with a phone number, you can add the android:onClick attribute to the button for sending a message: For example, an app that enables a user make a phone call and/or send a message to the phone number might offer a simple layout with a phone icon button for calling, and a messaging icon button for sending a message, as shown in the figure below. Use a button (such as an ImageButton) that the user can tap to pass the phone number to the SMS app. Tip: For details about using methods in the PhoneNumberUtils class to format a phone number string, see the related concept Phone Calls. You can use a hardcoded phone number, such as the phone number of a support message center, or provide an EditText field in the layout to enable the user to enter a phone number. To use an Intent to launch an SMS app, your app needs to prepare a Uniform Resource Identifier (URI) for the phone number as a string prefixed by "smsto:" (as in smsto:14155551212). When receiving a PDU, you can create an SmsMessage object from the raw PDU using createFromPdu(). The sendTextMessage() and sendMultimediaMessage() methods of the SmsManager class encode the contents for you. To access this metadata, SMS apps almost always use PDUs to encode the contents of a SMS message. PDU (protocol data unit) contains not only the SMS message, but also metadata about the SMS message, such as text encoding, the sender, SMS service center address, and much more. Most smartphones and mobile phones support what is known as "PDU mode" for sending and receiving SMS. Your app receives SMS messages by listening for the SMS_RECEIVED_ACTION broadcast. The Android framework sends out system broadcasts of events such as receiving an SMS message, containing intents that are meant to be received using a BroadcastReceiver. To receive SMS messages, the best practice is to 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 code must ask the user for permission before sending the 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. This is the simplest choice for sending messages.Use an implicit Intent to launch a messaging app such as Messenger, with the ACTION_SENDTO action.You have two choices for sending SMS messages: The Messenger app itself is governed by user permission. However, your app doesn't need permission to pass a phone number to an installed SMS app, such as Messenger, for sending the message. Just as your app needs the user's permission to use phone features, so also does an app need the user's permission to directly use SMS features. SMS is neither encrypted nor strongly authenticated on either the network or the device.Īccess to the SMS features of an Android device is protected by user permissions. You should not use SMS to send data messages from a web server to your app on a user device. Note: The SMS protocol was primarily designed for user-to-user communication and is not well-suited for apps that want to transfer data. ![]()
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