# Create AILD interfaces

In case of callback AIDL, in addition to `ICalculator.aidl` file, we also need to create another `ICalculatorCallback.aidl`

* [x] Create Callback interface

```java
// ICalculatorCallback.aidl
package com.tejpratapsingh.aildlib;

import com.tejpratapsingh.aildlib.ICalculatorCallback;
// Declare any non-default types here with import statements

interface ICalculatorCallback {
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void onAdded(int result);
}
```

* [x] Create main `aidl` which will register the callback interface.

```java
// ICalculator.aidl
package com.tejpratapsingh.aildlib;

import com.tejpratapsingh.aildlib.ICalculatorCallback;

// Declare any non-default types here with import statements

interface ICalculator {
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void registerListener(ICalculatorCallback cb);
    void unRegisterListener(ICalculatorCallback cb);

    void add(int a, int b);
}
```


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