前言
几乎每个app都会有登录注册的功能，可以看看笔者开发的『南方周末新闻阅读器』，登录、手机注册、忘记密码这些入口，这些功能在app中要如何来实现呢？这个模块看似很简单，但要做好就需要考虑很多细节，比如对用户的输入的容错，操作的提示文案的设定，登录成功保存用户信息等等。
业务流程图
业务逻辑描述
上一节的流程图已经很清晰的展现了登录注册的流程，这里继续用文字说明一下：
1. 点击进入个人中心或者需要用户登录状态的操作，先判断用户是否已经登录。
2. 如果已经登录，则继续后面的业务，否则，跳转到登录页面进行登录。
3. 如果已经有账号，则可以直接登录，或者可以直接选择第三方平台授权登录。
4. 如果未注册账号，则需要先进行账号注册，注册成功后再登录；也可以不注册账号，通过第三方平台授权进行登录。
5. 如果有账号，但忘记密码，则需要进行重置密码，否则直接登录。
具体实现
登录可以使用账号登录，现在的app基本上都是手机号码登录，注册的时候也是一个手机对应一个账号，通过发送验证码进行验证；用户也可以选择第三方平台进行登录，一般会提供微信、QQ、新浪微博这样的主流社交平台进行授权登录，这里笔者使用了友盟的SDK进行实现。
示例代码：LoginActivity.java
package com.devilwwj.loginandregister;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.text.TextUtils;import android.text.method.HideReturnsTransformationMethod;import android.text.method.PasswordTransformationMethod;import android.view.KeyEvent;import android.view.View;import android.view.inputmethod.EditorInfo;import android.widget.TextView;import android.widget.Toast;import com.devilwwj.loginandregister.global.AppConstants;import com.devilwwj.loginandregister.utils.LogUtils;import com.devilwwj.loginandregister.utils.ProgressDialogUtils;import com.devilwwj.loginandregister.utils.RegexUtils;import com.devilwwj.loginandregister.utils.ShareUtils;import com.devilwwj.loginandregister.utils.SpUtils;import com.devilwwj.loginandregister.utils.ToastUtils;import com.devilwwj.loginandregister.utils.Utils;import com.devilwwj.loginandregister.views.CleanEditText;import com.umeng.socialize.bean.SHARE_MEDIA;import com.umeng.socialize.controller.UMServiceFactory;import com.umeng.socialize.controller.UMSocialService;import com.umeng.socialize.controller.listener.SocializeListeners.UMAuthListener;import com.umeng.socialize.controller.listener.SocializeListeners.UMDataListener;import com.umeng.socialize.exception.SocializeException;import java.util.Map;import static android.view.View.OnClickListener;/** * @desc 登录界面 * Created by devilwwj on 16/1/24. */public class LoginActivity extends Activity implements OnClickListener { private static final String TAG = "loginActivity"; private static final int REQUEST_CODE_TO_REGISTER = 0x001; // 界面控件 private CleanEditText accountEdit; private CleanEditText passwordEdit; // 第三方平台获取的访问token，有效时间，uid private String accessToken; private String expires_in; private String uid; private String sns; // 整个平台的Controller，负责管理整个SDK的配置、操作等处理 private UMSocialService mController = UMServiceFactory .getUMSocialService(AppConstants.DESCRIPTOR); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); initViews(); // 配置分享平台 ShareUtils.configPlatforms(this); } /** * 初始化视图 */ private void initViews() { accountEdit = (CleanEditText) this.findViewById(R.id.et_email_phone); accountEdit.setImeOptions(EditorInfo.IME_ACTION_NEXT); accountEdit.setTransformationMethod(HideReturnsTransformationMethod .getInstance()); passwordEdit = (CleanEditText) this.findViewById(R.id.et_password); passwordEdit.setImeOptions(EditorInfo.IME_ACTION_DONE); passwordEdit.setImeOptions(EditorInfo.IME_ACTION_GO); passwordEdit.setTransformationMethod(PasswordTransformationMethod .getInstance()); passwordEdit.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { if (actionId == EditorInfo.IME_ACTION_DONE || actionId == EditorInfo.IME_ACTION_GO) { clickLogin(); } return false; } }); } private void clickLogin() { String account = accountEdit.getText().toString(); String password = passwordEdit.getText().toString(); if (checkInput(account, password)) { // TODO: 请求服务器登录账号 } } /** * 检查输入 * * @param account * @param password * @return */ public boolean checkInput(String account, String password) { // 账号为空时提示 if (account == null || account.trim().equals("")) { Toast.makeText(this, R.string.tip_account_empty, Toast.LENGTH_LONG) .show(); } else { // 账号不匹配手机号格式（11位数字且以1开头） if ( !RegexUtils.checkMobile(account)) { Toast.makeText(this, R.string.tip_account_regex_not_right, Toast.LENGTH_LONG).show(); } else if (password == null || password.trim().equals("")) { Toast.makeText(this, R.string.tip_password_can_not_be_empty, Toast.LENGTH_LONG).show(); } else { return true; } } return false; } @Override public void onClick(View v) { Intent intent = null; switch (v.getId()) { case R.id.iv_cancel: finish(); break; case R.id.btn_login: clickLogin(); break; case R.id.iv_wechat: clickLoginWexin(); break; case R.id.iv_qq: clickLoginQQ(); break; case R.id.iv_sina: loginThirdPlatform(SHARE_MEDIA.SINA); break; case R.id.tv_create_account: enterRegister(); break; case R.id.tv_forget_password: enterForgetPwd(); break; default: break; } } /** * 点击使用QQ快速登录 */ private void clickLoginQQ() { if (!Utils.isQQClientAvailable(this)) { ToastUtils.showShort(LoginActivity.this, getString(R.string.no_install_qq)); } else { loginThirdPlatform(SHARE_MEDIA.QZONE); } } /** * 点击使用微信登录 */ private void clickLoginWexin() { if (!Utils.isWeixinAvilible(this)) { ToastUtils.showShort(LoginActivity.this, getString(R.string.no_install_wechat)); } else { loginThirdPlatform(SHARE_MEDIA.WEIXIN); } } /** * 跳转到忘记密码 */ private void enterForgetPwd() { Intent intent = new Intent(this, ForgetPasswordActivity.class); startActivity(intent); } /** * 跳转到注册页面 */ private void enterRegister() { Intent intent = new Intent(this, SignUpActivity.class); startActivityForResult(intent, REQUEST_CODE_TO_REGISTER); } /** * 授权。如果授权成功，则获取用户信息 * * @param platform */ private void loginThirdPlatform(final SHARE_MEDIA platform) { mController.doOauthVerify(LoginActivity.this, platform, new UMAuthListener() { @Override public void onStart(SHARE_MEDIA platform) { LogUtils.i(TAG, "onStart------" + Thread.currentThread().getId()); ProgressDialogUtils.getInstance().show( LoginActivity.this, getString(R.string.tip_begin_oauth)); } @Override public void onError(SocializeException e, SHARE_MEDIA platform) { LogUtils.i(TAG, "onError------" + Thread.currentThread().getId()); ToastUtils.showShort(LoginActivity.this, getString(R.string.oauth_fail)); ProgressDialogUtils.getInstance().dismiss(); } @Override public void onComplete(Bundle value, SHARE_MEDIA platform) { LogUtils.i(TAG, "onComplete------" + value.toString()); if (platform == SHARE_MEDIA.SINA) { accessToken = value.getString("access_key"); } else { accessToken = value.getString("access_token"); } expires_in = value.getString("expires_in"); // 获取uid uid = value.getString(AppConstants.UID); if (value != null && !TextUtils.isEmpty(uid)) { // uid不为空，获取用户信息 getUserInfo(platform); } else { ToastUtils.showShort(LoginActivity.this, getString(R.string.oauth_fail)); } } @Override public void onCancel(SHARE_MEDIA platform) { LogUtils.i(TAG, "onCancel------" + Thread.currentThread().getId()); ToastUtils.showShort(LoginActivity.this, getString(R.string.oauth_cancle)); ProgressDialogUtils.getInstance().dismiss(); } }); } /** * 获取用户信息 * * @param platform */ private void getUserInfo(final SHARE_MEDIA platform) { mController.getPlatformInfo(LoginActivity.this, platform, new UMDataListener() { @Override public void onStart() { // 开始获取 LogUtils.i("getUserInfo", "onStart------"); ProgressDialogUtils.getInstance().dismiss(); ProgressDialogUtils.getInstance().show( LoginActivity.this, "正在请求..."); } @Override public void onComplete(int status, Map<String, Object> info) { try { String sns_id = ""; String sns_avatar = ""; String sns_loginname = ""; if (info != null && info.size() != 0) { LogUtils.i("third login", info.toString()); if (platform == SHARE_MEDIA.SINA) { // 新浪微博 sns = AppConstants.SINA; if (info.get(AppConstants.UID) != null) { sns_id = info.get(AppConstants.UID) .toString(); } if (info.get(AppConstants.PROFILE_IMAGE_URL) != null) { sns_avatar = info .get(AppConstants.PROFILE_IMAGE_URL) .toString(); } if (info.get(AppConstants.SCREEN_NAME) != null) { sns_loginname = info.get( AppConstants.SCREEN_NAME) .toString(); } } else if (platform == SHARE_MEDIA.QZONE) { // QQ sns = AppConstants.QQ; if (info.get(AppConstants.UID) == null) { ToastUtils .showShort( LoginActivity.this, getString(R.string.oauth_fail)); return; } sns_id = info.get(AppConstants.UID) .toString(); sns_avatar = info.get( AppConstants.PROFILE_IMAGE_URL) .toString(); sns_loginname = info.get( AppConstants.SCREEN_NAME) .toString(); } else if (platform == SHARE_MEDIA.WEIXIN) { // 微信 sns = AppConstants.WECHAT; sns_id = info.get(AppConstants.OPENID) .toString(); sns_avatar = info.get( AppConstants.HEADIMG_URL) .toString(); sns_loginname = info.get( AppConstants.NICKNAME).toString(); } // 这里直接保存第三方返回来的用户信息 SpUtils.putBoolean(LoginActivity.this, AppConstants.THIRD_LOGIN, true); LogUtils.e("info", sns + "," + sns_id + "," + sns_loginname); // TODO: 这里执行第三方连接(绑定服务器账号） } } catch (Exception e) { e.printStackTrace(); } } }); }}示例代码：SignUpActivity.java
package com.devilwwj.loginandregister;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.inputmethod.EditorInfo;import android.widget.Button;import android.widget.TextView;import android.widget.TextView.OnEditorActionListener;import com.devilwwj.loginandregister.utils.RegexUtils;import com.devilwwj.loginandregister.utils.ToastUtils;import com.devilwwj.loginandregister.utils.VerifyCodeManager;import com.devilwwj.loginandregister.views.CleanEditText;/** * @desc 注册界面 * 功能描述：一般会使用手机登录，通过获取手机验证码，跟服务器交互完成注册 * Created by devilwwj on 16/1/24. */public class SignUpActivity extends Activity implements OnClickListener{ private static final String TAG = "SignupActivity"; // 界面控件 private CleanEditText phoneEdit; private CleanEditText passwordEdit; private CleanEditText verifyCodeEdit; private Button getVerifiCodeButton; private VerifyCodeManager codeManager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_signup); initViews(); codeManager = new VerifyCodeManager(this, phoneEdit, getVerifiCodeButton); } /** * 通用findViewById,减少重复的类型转换 * * @param id * @return */ @SuppressWarnings("unchecked") public final <E extends View> E getView(int id) { try { return (E) findViewById(id); } catch (ClassCastException ex) { Log.e(TAG, "Could not cast View to concrete class.", ex); throw ex; } } private void initViews() { getVerifiCodeButton = getView(R.id.btn_send_verifi_code); getVerifiCodeButton.setOnClickListener(this); phoneEdit = getView(R.id.et_phone); phoneEdit.setImeOptions(EditorInfo.IME_ACTION_NEXT);// 下一步 verifyCodeEdit = getView(R.id.et_verifiCode); verifyCodeEdit.setImeOptions(EditorInfo.IME_ACTION_NEXT);// 下一步 passwordEdit = getView(R.id.et_password); passwordEdit.setImeOptions(EditorInfo.IME_ACTION_DONE); passwordEdit.setImeOptions(EditorInfo.IME_ACTION_GO); passwordEdit.setOnEditorActionListener(new OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { // 点击虚拟键盘的done if (actionId == EditorInfo.IME_ACTION_DONE || actionId == EditorInfo.IME_ACTION_GO) { commit(); } return false; } }); } private void commit() { String phone = phoneEdit.getText().toString().trim(); String password = passwordEdit.getText().toString().trim(); String code = verifyCodeEdit.getText().toString().trim(); if (checkInput(phone, password, code)) { // TODO:请求服务端注册账号 } } private boolean checkInput(String phone, String password, String code) { if (TextUtils.isEmpty(phone)) { // 电话号码为空 ToastUtils.showShort(this, R.string.tip_phone_can_not_be_empty); } else { if (!RegexUtils.checkMobile(phone)) { // 电话号码格式有误 ToastUtils.showShort(this, R.string.tip_phone_regex_not_right); } else if (TextUtils.isEmpty(code)) { // 验证码不正确 ToastUtils.showShort(this, R.string.tip_please_input_code); } else if (password.length() < 6 || password.length() > 32 || TextUtils.isEmpty(password)) { // 密码格式 ToastUtils.showShort(this, R.string.tip_please_input_6_32_password); } else { return true; } } return false; } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_send_verifi_code: // TODO 请求接口发送验证码 codeManager.getVerifyCode(VerifyCodeManager.REGISTER); break; default: break; } }}Github
登录注册的解决方案，笔者已经做成一个Demo放到github了，大家在实际开发的时候可以参考着根据自身的业务进行调整，但基本上不会差太多，第三方登录、验证码这个都可以选用第三方服务来实现，github地址如下：
登录注册解决方案
作者：巫山老妖
博客地址：http://blog.csdn.net/wwj_748?viewmode=contents
微信号：whatswwj
微信公众号：wwjblog