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Note As part of our ongoing commitment to best security practices, we have rotated the signing keys used to sign previous releases of this SDK. As a result, new patch builds have been released using the new signing key. Please upgrade at your earliest convenience.

While this change won't affect most developers, if you have implemented a dependency signature validation step in your build process, you may notice a warning that past releases can't be verified. This is expected, and a result of the key rotation process. Updating to the latest version will resolve this for you.

Lock for Android

CircleCI License Maven Central

📚 Documentation • 🚀 Getting Started • ⏭️ Next Steps • 💬 Feedback


Getting Started


Android API Level 21+ & Java version 8 or above is required in order to use Lock's UI.

Here’s what you need in build.gradle to target Java 8 byte code for the Android and Kotlin plugins respectively.

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

    kotlinOptions {
        jvmTarget = '1.8'


Lock is available in Maven Central. To start using Lock add this line to the dependencies of your build.gradle file:

implementation ''

Next Steps

If you haven't done yet, go to Auth0 and create an Account, it's free! Then create a new Application of type Native and add a URL in Allowed Callback URLs with the following format:


The package name value required in the Callback URL can be found in your app's build.gradle file in the applicationId property. Both the domain and client id values can be found at the top of your Auth0 Application's settings. You're going to use them to setup the SDK. It's good practice to add them to the strings.xml file as string resources that you can reference later from the code. This guide will follow that practice.

    <string name="com_auth0_client_id">YOUR_AUTH0_CLIENT_ID</string>
    <string name="com_auth0_domain">YOUR_AUTH0_DOMAIN</string>

In your app/build.gradle file add the Manifest Placeholders for the Auth0 Domain and Auth0 Scheme properties, which are going to be used internally by the library to declare the Lock activities and register intent-filters that will capture the authentication result.

apply plugin: ''

android {
    compileSdkVersion 30
    defaultConfig {
        applicationId "com.auth0.samples"
        minSdkVersion 21
        targetSdkVersion 30

        //---> Add the next line
        manifestPlaceholders = [auth0Domain: "@string/com_auth0_domain", auth0Scheme: "https"]

The next step is to create an instance of Auth0 with your application's information. The easiest way to create it is by using the values defined previously in the strings.xml file and passing an Android Context. For this to work, you must have defined the string resources using the same keys as listed above.

val account = Auth0(context)

Alternatively, you can directly pass the values.

val account = Auth0("{YOUR_AUTH0_CLIENT_ID}", "{YOUR_AUTH0_DOMAIN}")

Or, if you are using custom domains and are required to specify a different URL to fetch the Lock widget configuration from, you can use the constructor that takes 3 parameters:


Email/Password, Enterprise & Social authentication

Initialize Lock and handle the release of its resources appropriately after you're done using it.

// This activity will show Lock
class MyActivity : AppCompatActivity() {

    private lateinit var lock: Lock

    override fun onCreate(savedInstanceState: Bundle?) {
        val account = Auth0(this)
        // Instantiate Lock once
        lock = Lock.newBuilder(account, callback)
            // Customize Lock
    override fun onDestroy() {
        // Important! Release Lock and its resources
    private val callback = object : AuthenticationCallback() {
        override fun onAuthentication(credentials: Credentials) {
            // Authenticated
        override fun onError(error: AuthenticationException) {
            // An exception occurred

Start LockActivity from inside your Activity. For this, create a new intent from the Lock instance and launch it.


Customizing the widget

When using the Builder to instantiate the widget, you can pass different options to customize how it will behave. Some options are only available for Lock or PasswordlessLock. Below you will find a few of them. You can always explore all the available options with your IDE's auto-complete shortcut. Check the Javadocs to understand the default values.

// Create a new builder from Lock or LockPasswordless classes
newBuilder(account, callback)
    // Shared options
    .closable(true) // Allows the widget to be closed with the back button
    .withScope('new-scope') // Changes the scope to be requested on authentication
    .withAudience('my-api') // Changes the audience to be requested on authentication
    .withScheme('myapp') // Changes the scheme part used to generate the Callback URL (more below)
    // Lock specific options
    .initialScreen(InitialScreen.SIGN_UP) // Allows to choose the screen to be displayed first 
    .allowLogIn(false) // Disables the Log In screen
    .allowSignUp(false) // Disables the Sign Up screen
    .allowForgotPassword(false) // Disables the Change Password screen
    .setDefaultDatabaseConnection('my-connection') // When multiple are available, select one
    // PasswordlessLock specific options
    .useCode(true)  // Requests to receive a OTP that will need to be filled in your android app to authenticate the user
    .useLink(false) // Requests to receive a link that will open your android app to authenticate the user
    .rememberLastLogin(true) // Saves the email or phone number to avoid re-typing it in the future
    // Build the instance



We appreciate feedback and contribution to this repo! Before you get started, please see the following:

Raise an issue

To provide feedback or report a bug, please raise an issue on our issue tracker.

Vulnerability Reporting

Please do not report security vulnerabilities on the public Github issue tracker. The Responsible Disclosure Program details the procedure for disclosing security issues.

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Auth0 is an easy to implement, adaptable authentication and authorization platform. To learn more checkout Why Auth0?

This project is licensed under the MIT license. See the LICENSE file for more info.