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CustomerActivity.java

public class CustomerActivity extends Activity implements ICustomerView, OnClickListener {

	private EditText mFirstNameEditText, mLastNameEditText, mIdEditText;
	private Button mSaveButton, mLoadButton;
	private CustomerPresenter mCustomerPresenter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_customer);

		mFirstNameEditText = (EditText) findViewById(R.id.firstNameEditText);
		mLastNameEditText = (EditText) findViewById(R.id.lastNameEditText);
		mIdEditText = (EditText) findViewById(R.id.et_id);

		mSaveButton = (Button) findViewById(R.id.saveButton);
		mLoadButton = (Button) findViewById(R.id.loadButton);

		mCustomerPresenter = new CustomerPresenter(this);
		mSaveButton.setOnClickListener(this);
		mLoadButton.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.saveButton:
			mCustomerPresenter.saveCustomer(mFirstNameEditText.getText().toString(), mLastNameEditText.getText().toString());
			break;
		case R.id.loadButton:
			mCustomerPresenter.loadCustomer(Integer.parseInt(mIdEditText.getText().toString()));
			break;
		}
	}

	@Override
	public void setLastName(String lastName) {
		mLastNameEditText.setText(lastName);
	}

	@Override
	public void setFirstName(String firstName) {
		mFirstNameEditText.setText(firstName);
	}

	@Override
	public void setId(int id) {
		mIdEditText.setText(String.valueOf(id));
	}
}

CustomerPresenter.java

public class CustomerPresenter {

	private ICustomerView mCustomerView;
	private ICustomerModel mCustomerModel;

	public CustomerPresenter(ICustomerView view) {
		mCustomerView = view;
		mCustomerModel = new CustomerModel();
	}

	public void saveCustomer(String firstName, String lastName) {
		mCustomerModel.setFirstName(firstName);
		mCustomerModel.setLastName(lastName);
	}

	public void loadCustomer(int id) {
		mCustomerView.setId(mCustomerModel.getId());
		mCustomerView.setFirstName(mCustomerModel.getFirstName());
		mCustomerView.setLastName(mCustomerModel.getLastName());
	}
}

ICustomerView.java

public interface ICustomerView {
    void setLastName (String lastName); 
    void setFirstName (String firstName);
    void setId(int id);
}

ICustomerModel.java

public interface ICustomerModel {
	void setFirstName(String firstName);
	void setLastName(String lastName);
	void setId(int id);
	int getId();
	String getFirstName();
	String getLastName();
}

CustomerModel.java

public class CustomerModel implements ICustomerModel {

	int id;
	String firstName;
	String lastName;
	
	@Override
	public int getId() {
		return id;
	}
	
	@Override
	public void setId(int id) {
		this.id = id;
	}
	
	@Override
	public String getFirstName() {
		return firstName;
	}
	
	@Override
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	
	@Override
	public String getLastName() {
		return lastName;
	}
	
	@Override
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	
}
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