compile 'commons-codec:commons-codec:1.10'
 compile 'com.google.guava:guava:19.0'
 compile 'com.squareup.okhttp3:okhttp:3.5.0'
 compile 'com.fasterxml.jackson.core:jackson-databind:2.7.2'

1. Download project from github
2. Unzip the downloaded file (a directory Rave master will be created)
3. Click File > New > Import Module.
4. In the Source directory box, Navigate to Rave master directory created earlier 
5. Select the `raveModule` folder
6. Click Finish. Once the module is imported, it appears in the Project window on the left.
7. add `compile project(":raveModule")` to your dependencies in build.gradle at app level.
8. Finally, clean and rebuild project.

public class MainActivity extends AppCompatActivity {

    private Button raveButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        raveButton = (Button)findViewById(R.id.rave_btn);

        raveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // create rave data object
                // All Constructor parameters must be provided.
                RaveData raveData = new RaveData.Builder(
                        "Shawarma and Coke", // item name
                        "Shawarma and Coke for kenny", // item description
                        1400.00, // item price
                        "FLWPUBK-XXXXX", // public key
                        "FLWSECK-XXXXX", // secret key
                        "[email protected]", // buyer's email address
                        "FLW-TXREF-XXXXX", // tx-ref
                        false // this boolean field specifies if auth model used is PIN(true) or other(false)
                        )
                        .build();

                // initialize RaveDialog using RaveData object created above and call show() to display dialog.
                RaveDialog rave = new RaveDialog(MainActivity.this, raveData);
                rave.show();
            }
        });
    }
}

                Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.coke);

                // create rave data object
                // All Constructor parameters must be provided.
                RaveData raveData = new RaveData.Builder(
                        "Shawarma and Coke", // item name
                        "Shawarma and Coke for kenny", // item description
                        1400.00, // item price
                        "FLWPUBK-XXXXX", // public key
                        "FLWSECK-XXXXX", // secret key
                        "[email protected]", // buyer's email address
                        "FLW-TXREF-XXXXX" // tx-ref)

                        // optional parameters
                        .withItemImage(bitmap)
                        .withCountry("Nigeria")
                        .withCurrency("NGN")
                        .withFirstName("fname")
                        .withLastName("lname")
                        .withIp("127.0.0.1")
                        .withMeta(Lists.<Map<String,Object>>newArrayList())
                        .withNarration("Narration")
                        .build();