Get started with Voice on Android:
To get started with the Quickstart application follow these steps. Steps 1-6 will allow you to make a call. The remaining steps 7-8 will enable push notifications using FCM.
Go to the API Keys page and create a new API key.
Save the generated API_KEY
and API_KEY_SECRET
in your notepad. You will need them in the next step.
Download starter project for the server.
Follow the instructions in the server's README to get the application server up and running locally and accessible via the public Internet. For now just add the Twilio Account SID that you can obtain from the console, and the API_KEY
and API_SECRET
you obtained in the previous step.
ACCOUNT_SID = 'AC***'
API_KEY = 'SK***'
API_KEY_SECRET = '***'
Next, we need to create a TwiML application. A TwiML application identifies a public URL for retrieving TwiML call control instructions. When your Android app makes a call to the Twilio cloud, Twilio will make a webhook request to this URL, your application server will respond with generated TwiML, and Twilio will execute the instructions you’ve provided.
To create a TwiML application, go to the TwiML app page. Create a new TwiML application, and use the public URL of your application server’s /outgoing
endpoint as the Voice Request URL.
As you can see we’ve used our ngrok public address in the Request URL field above.
Save your TwiML Application configuration, and grab the TwiML Application SID (a long identifier beginning with the characters "AP").
Put the remaining APP_SID
configuration info into your application server by opening server.py
and setting the following constants with the information you gathered above.
ACCOUNT_SID = 'AC***'
API_KEY = 'SK***'
API_KEY_SECRET = '***'
APP_SID = 'AP***'
Once you’ve done that, restart the server so it uses the new configuration info. Now it's time to test.
Open up a browser and visit the URL for your application server's Access Token endpoint: https://{YOUR-SERVER}/accessToken
. If everything is configured correctly, you should see a long string of letters and numbers, which is a Twilio Access Token. Your Android app will use a token like this to connect to Twilio.
Paste the Access Token into the VoiceActivity.java.
Run the quickstart app on an Android device
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Press the call button to connect to Twilio
google-services.json
The Programmable Voice Android SDK uses Firebase Cloud Messaging push notifications to let your application know when it is receiving an incoming call. If you want your users to receive incoming calls, you’ll need to enable FCM in your application.
Follow the steps under Use the Firebase Assistant in the Firebase Developers Guide. Once you connect and sync to Firebase successfully, you will be able to download the google-services.json
for your application.
Login to Firebase console and make a note of generated Server API Key
and Sender ID
in your notepad. You will need them in the next step.
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Make sure the generated google-services.json
is downloaded to the app
directory of the quickstart project to replace the existing app/google-services.json
stub json file. If you are using the Firebase plugin make sure to remove the stub google-services.json
file first.
As a final step re-run the application from Android Studio to ensure the APK now has the latest google-services.json
file.
Server API Key
You will need to store the FCM Server API Key
with Twilio so that we can send push notifications to your app on your behalf. Once you store the API Key with Twilio, it will get assigned a Push Credential SID so that you can later specify which key we should use to send push notifications.
Go to the Push Credentials page and create a new Push Credential.
Paste in the Server API Key
and press Save.
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Put the PUSH_CREDENTIAL_SID
configuration info into your application server by opening server.py
and setting the following constants with the information you gathered above.
ACCOUNT_SID = 'AC***'
API_KEY = 'SK***'
API_KEY_SECRET = '***'
PUSH_CREDENTIAL_SID = 'CR***'
APP_SID = 'AP***'
Once you’ve done that, restart the server so it uses the new configuration info. Now it's time to test. Hit your application server's placeCall
endpoint. This will trigger a Twilio REST API request that will make an inbound call to your mobile app. Once your app accepts the call, you should hear a congratulatory message.
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The SDK supports using emulators except in the following known cases:
In general we advise using a real device when doing development with our SDK since real-time audio is a performance oriented operation.
Our library is built using native libraries. As a result, if you use the default gradle build you will generate an APK with all four architectures(armeabi-v7a, arm64-v8a, x86, x86_64) in your APK.
APK splits allow developers to build multiple APKs for different screen sizes and ABIs. Enabling APK splits ensures that the minimum amount of files required to support a particular device are packaged into an APK.
The following snippet shows an example build.gradle
with APK splits enabled.
apply plugin: 'com.android.application'
android {
// Specify that we want to split up the APK based on ABI
splits {
abi {
// Enable ABI split
enable true
// Clear list of ABIs
reset()
// Specify each architecture currently supported by the Voice SDK
include "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
// Specify that we do not want an additional universal SDK
universalApk false
}
}
}
The adoption of APK splits requires developers to submit multiple APKs to the Play Store. Refer to Google’s documentation for how to support this in your application.
You can find more documentation on getting started as well as our latest Javadoc below:
To learn more about how to use TwiML and the Programmable Voice Calls API, check out our TwiML quickstarts:
Please file any issues you find here on Github. For general inquiries related to the Voice SDK you can file a support ticket.
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