src/com/android/email/activity/setup/SignInActivity.java

package com.android.email.activity.setup;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.ImageButton;

import com.android.email.R;
import com.android.email.activity.UiUtilities;

public class SignInActivity extends Activity implements SignInFragment.SignInCallback,
        View.OnClickListener {

    public static final String EXTRA_EMAIL = "email";

    public static final String EXTRA_PASSWORD = "password";
    public static final String EXTRA_OAUTH_PROVIDER = "provider";
    public static final String EXTRA_OAUTH_ACCESS_TOKEN = "accessToken";
    public static final String EXTRA_OAUTH_REFRESH_TOKEN = "refreshToken";
    public static final String EXTRA_OAUTH_EXPIRES_IN_SECONDS = "expiresInSeconds";

    private SignInFragment mFragment;
    private ImageButton mNextButton;
    private ImageButton mPrevButton;

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sign_in_activity);
        mFragment = (SignInFragment)
                getFragmentManager().findFragmentById(R.id.sign_in_fragment);
        mFragment.setEmailAddress(getIntent().getStringExtra(EXTRA_EMAIL));
        mFragment.setSignInCallback(this);
        mNextButton = UiUtilities.getView(this, R.id.next);
        mPrevButton = UiUtilities.getView(this, R.id.previous);
        mNextButton.setOnClickListener(this);
        mPrevButton.setOnClickListener(this);

        onValidate();
        // Assume canceled until we find out otherwise.
        setResult(RESULT_CANCELED);
    }

    @Override
    public void onOAuthSignIn(final String providerId, final String accessToken,
            final String refreshToken, final int expiresInSeconds) {
        final Intent intent = new Intent();
        intent.putExtra(EXTRA_OAUTH_PROVIDER, providerId);
        intent.putExtra(EXTRA_OAUTH_ACCESS_TOKEN, accessToken);
        intent.putExtra(EXTRA_OAUTH_REFRESH_TOKEN, refreshToken);
        intent.putExtra(EXTRA_OAUTH_EXPIRES_IN_SECONDS, expiresInSeconds);
        setResult(RESULT_OK, intent);
        finish();
    }

    private void onPasswordSignIn(final String password) {
        final Intent intent = new Intent();
        intent.putExtra(EXTRA_PASSWORD, password);
        setResult(RESULT_OK, intent);
        finish();
    }

    @Override
    public void onValidate() {
        mNextButton.setEnabled(!TextUtils.isEmpty(mFragment.getPassword()));
    }

    @Override
    public void onClick(View view) {
        if (view == mNextButton) {
            onPasswordSignIn(mFragment.getPassword());
        } else if (view == mPrevButton) {
            onBackPressed();
        }
    }
}