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Khalti Android SDK (Deprecated)

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Welcome to Khalti's checkout documentation



  • Android 5.0 and above
  • AndroidX (as of v2.00.00)
  • Android Studio 3 and above

Quick Note

  • We've dropped support of Android 4 since version 2.01.00


Add khalti-android to your build.gradle dependencies

implementation ('com.khalti:khalti-android:$latest_version') {
        transitive = true

Also add the following lines inside the android block of your build.gradle file

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

Disable R8 by adding the following lines inside your

android.enableR8 = false


Add KhaltiButton in your xml layout as follows


Add the following line in your root layout in your xml file if you're going to use khalti attribute.


Then, Locate your xml Khalti Button in your Java

KhaltiButton khaltiButton = (KhaltiButton) findViewById(;
XML Attribute
Attribute Description
app:text Text to display
app:khalti_button_style Set the style of KhaltiButton from the available options

Use the khalti_button_style attribute in your xml file to select a button style for your Khalti button. Or you can use the setButtonStyle() function in khalti button to set the style programmatically.

Available button styles
Button style Image

Alternatively you can also inflate KhaltiButton in your java class as follows

KhaltiButton khaltiButton = new KhaltiButton();

In order for Khalti button to be functional you'll need to pass an instance of Config.

Building Config

Create an instance of Builder class. Pass public key, product id, product name, amount (in paisa) and an implementation of OnCheckOutListener to the builder constructor.

Map<String, Object> map = new HashMap<>();
        map.put("merchant_extra", "This is extra data");

Builder builder = new Config.Builder(, "Product ID", "Main", 1100L, new OnCheckOutListener() {
            public void onError(@NonNull String action, @NonNull Map<String, String> errorMap) {
                Log.i(action, errorMap.toString());

            public void onSuccess(@NonNull Map<String, Object> data) {
                Log.i("success", data.toString());
                .paymentPreferences(new ArrayList<PaymentPreference>() {{

Here, the functions paymentPreferences(),additionalData(),productUrl() and mobile() are optional and are not required to build the config. When passing additionalData through additionalData() functions make sure you add a merchant_ prefix in your map key.

Finally, call the build() function in builder to build the config.

Config config =;
Available Config Builder Methods
Constraint Method Description
Optional paymentPreference() Set which payment option tabs are to be shown
Optional additionalData() Set additional data
Optional productUrl() Add url of product
Optional mobile() Preset mobile number in mobile field
Required build() Build config
Available payment preferences
Preferences Description
PaymentPreference.KHALTI Show Khalti payment tab
PaymentPreference.EBANKING Show E-banking payment tab
PaymentPreference.MOBILE_BANKING Show Mobile banking payment tab
PaymentPreference.CONNECT_IPS Show Connect IPS payment tab
PaymentPreference.SCT Show SCT card payment tab
Set Config

Set your config in your KhaltiButton.


Public Methods in KhaltiButton

Constraint Method Description
Required setCheckOutConfig(Config config) Set configuration required by Khalti checkout
Optional setText(String text) Set text to display in KhaltiButton
Optional setCustomView(View view) Replace KhaltiButton's default view with your custom view
Optional setButtonStyle(ButtonStyle buttonStyle) Select between the available options to set KhaltiButton's style

Callback Methods

Method Description
onSuccess(Map data) This method is called when a transaction has been completed and confirmed by the user. A map containing an access token, required to verify the transaction and data passed to the Config through the Config bulder is returned. Once this method is called, use the access token to verify the transaction. Please follow the verification process for further instructions.
onError(String action, Map errorMap) This method is called when an error occurs during payment initiation or confirmation. Action and errorMap value is passed where action defines the current action being performed and errorMap has the necessary information on the error.
onCancel() This method is called when the user dismisses or cancels the checkout process. (When the user presses back button).

Response Sample

Success Message
Key Value Type
mobile 98XXXXXXXX String
product_name Product Name String
product_identity Product Id String
product_url(if passed) Product Url String
amount 100 Long
token token String
idx Unique identifier String

The success message also contains all the key and value provided as extra data while building the Config.

Error Message
Variable Description Type
action Action performed - (initiate, confirm) String
errorMap Detail Error map Map

More Implementations

Method 1: With Custom Click Listener

Initialize the KhaltiCheckout Object

KhaltiCheckOut khaltiCheckOut = new KhaltiCheckOut(this, config);

Use to display Khalti widget

khaltiButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
Method 2: With Custom View

Get your custom view

View view = LayoutInflater.from(this).inflate(R.layout.custom_khalti_button, container, false);

Set custom view to your khalti button


Check out the source for Khalti checkout on Github.

Check out the Verification process.