小编程（三）：用户登录注册界面开发及用户信息管理案例代码详解
用户登录注册界面开发及用户信息管理案例详解
刚开始接触Android编程，这算是我写的第一个简单工程，主要功能有：用户登录、注册、注销、修改密码、记住密码共5个基本操作，其内容涉及到以下几点：
1：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用；
2：多个Activities之间的切换；
3：使用Android本地数据库来管理用户信息。
实现上述功能的主要参考资料：CSDN博客之星郭霖大牛写的《第一行代码—Android》，个人比较喜欢看纸质的资料，所以买了这本书，大牛的博客主页链接http://my.csdn.net/sinyu890807。其次是参考了网上的一个用户登录注册的程序，在此基础上按照自己的需求慢慢添加完善一些功能，并且将原来的单个avtivity换用多个activity实现，UI设计也更加漂亮美观。
先上几个图【我在android6.0.1的真机上调试的】：
下面是用户登录和用户注册界面。
下面是用户密码修改和个人中心界面。
一、工程代码
整个工程是在Android Studio 2.1.1环境下实现的，源码下载链接在末尾给出，下面是工程目录：
这里先贴出各个布局文件.xml，各个类内容和各个activity代码：
1：几个界面布局文件.xml
login.xml【登录界面】
2：用户数据管理的类
UserData.java 【用户数据】
package com.example.foolishfan.user_v10;
public class UserData {
private String userName; //用户名
private String userPwd; //用户密码
private int userId; //用户ID号
public int pwdresetFlag=0;
//获取用户名
public String getUserName() { //获取用户名
return userName;
}
//设置用户名
public void setUserName(String userName) { //输入用户名
this.userName = userName;
}
//获取用户密码
public String getUserPwd() { //获取用户密码
return userPwd;
}
//设置用户密码
public void setUserPwd(String userPwd) { //输入用户密码
this.userPwd = userPwd;
}
//获取用户id
public int getUserId() { //获取用户ID号
return userId;
}
//设置用户id
public void setUserId(int userId) { //设置用户ID号
this.userId = userId;
}
public UserData(String userName, String userPwd) { //这里只采用用户名和密码
super();
this.userName = userName;
this.userPwd = userPwd;
}
}
package com.example.foolishfan.user_v10;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class UserDataManager { //用户数据管理类
//一些宏定义和声明
private static final String TAG = "UserDataManager";
private static final String DB_NAME = "user_data";
private static final String TABLE_NAME = "users";
public static final String ID = "_id";
public static final String USER_NAME = "user_name";
public static final String USER_PWD = "user_pwd";
// public static final String SILENT = "silent";
// public static final String VIBRATE = "vibrate";
private static final int DB_VERSION = 2;
private Context mContext = null;
//创建用户book表
private static final String DB_CREATE = "CREATE TABLE " + TABLE_NAME + " ("
+ ID + " integer primary key," + USER_NAME + " varchar,"
+ USER_PWD + " varchar" + ");";
private SQLiteDatabase mSQLiteDatabase = null;
private DataBaseManagementHelper mDatabaseHelper = null;
//DataBaseManagementHelper继承自SQLiteOpenHelper
private static class DataBaseManagementHelper extends SQLiteOpenHelper {
DataBaseManagementHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.i(TAG,"db.getVersion()="+db.getVersion());
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME + ";");
db.execSQL(DB_CREATE);
Log.i(TAG, "db.execSQL(DB_CREATE)");
Log.e(TAG, DB_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.i(TAG, "DataBaseManagementHelper onUpgrade");
onCreate(db);
}
}
public UserDataManager(Context context) {
mContext = context;
Log.i(TAG, "UserDataManager construction!");
}
//打开数据库
public void openDataBase() throws SQLException {
mDatabaseHelper = new DataBaseManagementHelper(mContext);
mSQLiteDatabase = mDatabaseHelper.getWritableDatabase();
}
//关闭数据库
public void closeDataBase() throws SQLException {
mDatabaseHelper.close();
}
//添加新用户，即注册
public long insertUserData(UserData userData) {
String userName=userData.getUserName();
String userPwd=userData.getUserPwd();
ContentValues values = new ContentValues();
values.put(USER_NAME, userName);
values.put(USER_PWD, userPwd);
return mSQLiteDatabase.insert(TABLE_NAME, ID, values);
}
//更新用户信息，如修改密码
public boolean updateUserData(UserData userData) {
//int id = userData.getUserId();
String userName = userData.getUserName();
String userPwd = userData.getUserPwd();
ContentValues values = new ContentValues();
values.put(USER_NAME, userName);
values.put(USER_PWD, userPwd);
return mSQLiteDatabase.update(TABLE_NAME, values,null, null) > 0;
//return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0;
}
//
public Cursor fetchUserData(int id) throws SQLException {
Cursor mCursor = mSQLiteDatabase.query(false, TABLE_NAME, null, ID
+ "=" + id, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//
public Cursor fetchAllUserDatas() {
return mSQLiteDatabase.query(TABLE_NAME, null, null, null, null, null,
null);
}
//根据id删除用户
public boolean deleteUserData(int id) {
return mSQLiteDatabase.delete(TABLE_NAME, ID + "=" + id, null) > 0;
}
//根据用户名注销
public boolean deleteUserDatabyname(String name) {
return mSQLiteDatabase.delete(TABLE_NAME, USER_NAME + "=" + name, null) > 0;
}
//删除所有用户
public boolean deleteAllUserDatas() {
return mSQLiteDatabase.delete(TABLE_NAME, null, null) > 0;
}
//
public String getStringByColumnName(String columnName, int id) {
Cursor mCursor = fetchUserData(id);
int columnIndex = mCursor.getColumnIndex(columnName);
String columnValue = mCursor.getString(columnIndex);
mCursor.close();
return columnValue;
}
//
public boolean updateUserDataById(String columnName, int id,
String columnValue) {
ContentValues values = new ContentValues();
values.put(columnName, columnValue);
return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0;
}
//根据用户名找用户，可以判断注册时用户名是否已经存在
public int findUserByName(String userName){
Log.i(TAG,"findUserByName , userName="+userName);
int result=0;
Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName, null, null, null, null);
if(mCursor!=null){
result=mCursor.getCount();
mCursor.close();
Log.i(TAG,"findUserByName , result="+result);
}
return result;
}
//根据用户名和密码找用户，用于登录
public int findUserByNameAndPwd(String userName,String pwd){
Log.i(TAG,"findUserByNameAndPwd");
int result=0;
Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName+" and "+USER_PWD+"="+pwd,
null, null, null, null);
if(mCursor!=null){
result=mCursor.getCount();
mCursor.close();
Log.i(TAG,"findUserByNameAndPwd , result="+result);
}
return result;
}
}
3：具体操作的实现代码，即各个activity
Login.java【用户登录activity】package com.example.foolishfan.user_v10;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class Login extends Activity { //登录界面活动
public int pwdresetFlag=0;
private EditText mAccount; //用户名编辑
private EditText mPwd; //密码编辑
private Button mRegisterButton; //注册按钮
private Button mLoginButton; //登录按钮
private Button mCancleButton; //注销按钮
private CheckBox mRememberCheck;
private SharedPreferences login_sp;
private String userNameValue,passwordValue;
private View loginView; //登录
private View loginSuccessView;
private TextView loginSuccessShow;
private TextView mChangepwdText;
private UserDataManager mUserDataManager; //用户数据管理类
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//通过id找到相应的控件
mAccount = (EditText) findViewById(R.id.login_edit_account);
mPwd = (EditText) findViewById(R.id.login_edit_pwd);
mRegisterButton = (Button) findViewById(R.id.login_btn_register);
mLoginButton = (Button) findViewById(R.id.login_btn_login);
mCancleButton = (Button) findViewById(R.id.login_btn_cancle);
loginView=findViewById(R.id.login_view);
loginSuccessView=findViewById(R.id.login_success_view);
loginSuccessShow=(TextView) findViewById(R.id.login_success_show);
mChangepwdText = (TextView) findViewById(R.id.login_text_change_pwd);
mRememberCheck = (CheckBox) findViewById(R.id.Login_Remember);
login_sp = getSharedPreferences("userInfo", 0);
String name=login_sp.getString("USER_NAME", "");
String pwd =login_sp.getString("PASSWORD", "");
boolean choseRemember =login_sp.getBoolean("mRememberCheck", false);
boolean choseAutoLogin =login_sp.getBoolean("mAutologinCheck", false);
//如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码
if(choseRemember){
mAccount.setText(name);
mPwd.setText(pwd);
mRememberCheck.setChecked(true);
}
mRegisterButton.setOnClickListener(mListener); //采用OnClickListener方法设置不同按钮按下之后的监听事件
mLoginButton.setOnClickListener(mListener);
mCancleButton.setOnClickListener(mListener);
mChangepwdText.setOnClickListener(mListener);
ImageView image = (ImageView) findViewById(R.id.logo); //使用ImageView显示logo
image.setImageResource(R.drawable.logo);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地数据库
}
}
OnClickListener mListener = new OnClickListener() { //不同按钮按下的监听事件选择
public void onClick(View v) {
switch (v.getId()) {
case R.id.login_btn_register: //登录界面的注册按钮
Intent intent_Login_to_Register = new Intent(Login.this,Register.class) ; //切换Login Activity至User Activity
startActivity(intent_Login_to_Register);
finish();
break;
case R.id.login_btn_login: //登录界面的登录按钮
login();
break;
case R.id.login_btn_cancle: //登录界面的注销按钮
cancel();
break;
case R.id.login_text_change_pwd: //登录界面的注销按钮
Intent intent_Login_to_reset = new Intent(Login.this,Resetpwd.class) ; //切换Login Activity至User Activity
startActivity(intent_Login_to_reset);
finish();
break;
}
}
};
public void login() { //登录按钮监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息
String userPwd = mPwd.getText().toString().trim();
SharedPreferences.Editor editor =login_sp.edit();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1说明用户名和密码均正确
//保存用户名和密码
editor.putString("USER_NAME", userName);
editor.putString("PASSWORD", userPwd);
//是否记住密码
if(mRememberCheck.isChecked()){
editor.putBoolean("mRememberCheck", true);
}else{
editor.putBoolean("mRememberCheck", false);
}
editor.commit();
Intent intent = new Intent(Login.this,User.class) ; //切换Login Activity至User Activity
startActivity(intent);
finish();
Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示
}else if(result==0){
Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登录失败提示
}
}
}
public void cancel() { //注销
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息
String userPwd = mPwd.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1说明用户名和密码均正确
Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//注销成功提示
mPwd.setText("");
mAccount.setText("");
mUserDataManager.deleteUserDatabyname(userName);
}else if(result==0){
Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //注销失败提示
}
}
}
public boolean isUserNameAndPwdValid() {
if (mAccount.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.account_empty),
Toast.LENGTH_SHORT).show();
return false;
} else if (mPwd.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_empty),
Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
@Override
protected void onResume() {
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase();
}
super.onResume();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onPause() {
if (mUserDataManager != null) {
mUserDataManager.closeDataBase();
mUserDataManager = null;
}
super.onPause();
}
}
package com.example.foolishfan.user_v10;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Register extends AppCompatActivity {
private EditText mAccount; //用户名编辑
private EditText mPwd; //密码编辑
private EditText mPwdCheck; //密码编辑
private Button mSureButton; //确定按钮
private Button mCancelButton; //取消按钮
private UserDataManager mUserDataManager; //用户数据管理类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);
mPwd = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);
mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);
mSureButton = (Button) findViewById(R.id.register_btn_sure);
mCancelButton = (Button) findViewById(R.id.register_btn_cancel);
mSureButton.setOnClickListener(m_register_Listener); //注册界面两个按钮的监听事件
mCancelButton.setOnClickListener(m_register_Listener);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地数据库
}
}
View.OnClickListener m_register_Listener = new View.OnClickListener() { //不同按钮按下的监听事件选择
public void onClick(View v) {
switch (v.getId()) {
case R.id.register_btn_sure: //确认按钮的监听事件
register_check();
break;
case R.id.register_btn_cancel: //取消按钮的监听事件,由注册界面返回登录界面
Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; //切换User Activity至Login Activity
startActivity(intent_Register_to_Login);
finish();
break;
}
}
};
public void register_check() { //确认按钮的监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd = mPwd.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
//检查用户是否存在
int count=mUserDataManager.findUserByName(userName);
//用户已经存在时返回，给出提示文字
if(count>0){
Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
return ;
}
if(userPwd.equals(userPwdCheck)==false){ //两次密码输入不一样
Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
return ;
} else {
UserData mUser = new UserData(userName, userPwd);
mUserDataManager.openDataBase();
long flag = mUserDataManager.insertUserData(mUser); //新建用户信息
if (flag == -1) {
Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();
Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; //切换User Activity至Login Activity
startActivity(intent_Register_to_Login);
finish();
}
}
}
}
public boolean isUserNameAndPwdValid() {
if (mAccount.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.account_empty),
Toast.LENGTH_SHORT).show();
return false;
} else if (mPwd.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_empty),
Toast.LENGTH_SHORT).show();
return false;
}else if(mPwdCheck.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_check_empty),
Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
}
package com.example.foolishfan.user_v10;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;
public class Resetpwd extends AppCompatActivity {
private EditText mAccount; //用户名编辑
private EditText mPwd_old; //密码编辑
private EditText mPwd_new; //密码编辑
private EditText mPwdCheck; //密码编辑
private Button mSureButton; //确定按钮
private Button mCancelButton; //取消按钮
private UserDataManager mUserDataManager; //用户数据管理类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.resetpwd);
mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);
mPwd_old = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);
mPwd_new = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);
mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_check);
mSureButton = (Button) findViewById(R.id.resetpwd_btn_sure);
mCancelButton = (Button) findViewById(R.id.resetpwd_btn_cancel);
mSureButton.setOnClickListener(m_resetpwd_Listener); //注册界面两个按钮的监听事件
mCancelButton.setOnClickListener(m_resetpwd_Listener);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地数据库
}
}
View.OnClickListener m_resetpwd_Listener = new View.OnClickListener() { //不同按钮按下的监听事件选择
public void onClick(View v) {
switch (v.getId()) {
case R.id.resetpwd_btn_sure: //确认按钮的监听事件
resetpwd_check();
break;
case R.id.resetpwd_btn_cancel: //取消按钮的监听事件,由注册界面返回登录界面
Intent intent_Resetpwd_to_Login = new Intent(Resetpwd.this,Login.class) ; //切换Resetpwd Activity至Login Activity
startActivity(intent_Resetpwd_to_Login);
finish();
break;
}
}
};
public void resetpwd_check() { //确认按钮的监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd_old = mPwd_old.getText().toString().trim();
String userPwd_new = mPwd_new.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);
if(result==1){ //返回1说明用户名和密码均正确,继续后续操作
if(userPwd_new.equals(userPwdCheck)==false){ //两次密码输入不一样
Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
return ;
} else {
UserData mUser = new UserData(userName, userPwd_new);
mUserDataManager.openDataBase();
boolean flag = mUserDataManager.updateUserData(mUser);
if (flag == false) {
Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();
mUser.pwdresetFlag=1;
Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ; //切换User Activity至Login Activity
startActivity(intent_Register_to_Login);
finish();
}
}
}else if(result==0){ //返回0说明用户名和密码不匹配，重新输入
Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
return;
}
}
}
public boolean isUserNameAndPwdValid() {
String userName = mAccount.getText().toString().trim();
//检查用户是否存在
int count=mUserDataManager.findUserByName(userName);
//用户不存在时返回，给出提示文字
if(count<=0){
Toast.makeText(this, getString(R.string.name_not_exist, userName),Toast.LENGTH_SHORT).show();
return false;
}
if (mAccount.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.account_empty),Toast.LENGTH_SHORT).show();
return false;
} else if (mPwd_old.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_empty),Toast.LENGTH_SHORT).show();
return false;
} else if (mPwd_new.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_new_empty),Toast.LENGTH_SHORT).show();
return false;
}else if(mPwdCheck.getText().toString().trim().equals("")) {
Toast.makeText(this, getString(R.string.pwd_check_empty),Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
}
package com.example.foolishfan.user_v10;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class User extends AppCompatActivity {
private Button mReturnButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.user);
mReturnButton = (Button)findViewById(R.id.returnback);
}
public void back_to_login(View view) {
Intent intent3 = new Intent(User.this,Login.class) ;
startActivity(intent3);
finish();
}
}
二、功能分析
上面工程涉及到的这些内容，在网上有很多写的很有参考价值的资料，建议可单独熟悉各个部分内容，然后添加功能到已有代码基础上，由于好多天后才整理的博客，缺少很多刚学习时遇到的种种错误及其解决方法，细节之处还望多交流。
<1>：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用
<2>：多个Activities之间的切换
<3>：使用Android本地数据库来管理用户信息
1：登录功能
通过登录按钮的监听事件实现登录，登录过程中需要判断用户名是否存在，密码是否正确，核心函数：
public void login() { //登录按钮监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();//获取当前输入的用户名和密码信息
String userPwd = mPwd.getText().toString().trim();
SharedPreferences.Editor editor =login_sp.edit();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1说明用户名和密码均正确
//保存用户名和密码
editor.putString("USER_NAME", userName);
editor.putString("PASSWORD", userPwd);
//是否记住密码
if(mRememberCheck.isChecked()){
editor.putBoolean("mRememberCheck", true);
}else{
editor.putBoolean("mRememberCheck", false);
}
editor.commit();
Intent intent = new Intent(Login.this,User.class) ;
startActivity(intent);
finish();
Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示
}else if(result==0){
Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登录失败提示
}
}
}2：注册功能
登录界面上点击注册按钮，进入对应监听事件，直接实现从Login的Activity到Register的Activity的跳转，然后在Register的Activity上实现用户注册，核心函数：
public void register_check() { //确认按钮的监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd = mPwd.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
//检查用户是否存在
int count=mUserDataManager.findUserByName(userName);
//用户已经存在时返回，给出提示文字
if(count>0){
Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
return ;
}
if(userPwd.equals(userPwdCheck)==false){ //两次密码输入不一样
Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
return ;
} else {
UserData mUser = new UserData(userName, userPwd);
mUserDataManager.openDataBase();
long flag = mUserDataManager.insertUserData(mUser); //新建用户信息
if (flag == -1) {
Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();
Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;
startActivity(intent_Register_to_Login);
finish();
}
}
}
}3：修改密码功能
在登录界面点击“修改密码”即可进入对应的Resetpwd的Activity，实现用户密码的修改，核心函数：
public void resetpwd_check() { //确认按钮的监听事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd_old = mPwd_old.getText().toString().trim();
String userPwd_new = mPwd_new.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);
if(result==1){ //返回1说明用户名和密码均正确,继续后续操作
if(userPwd_new.equals(userPwdCheck)==false){ //两次密码输入不一样
Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
return ;
} else {
UserData mUser = new UserData(userName, userPwd_new);
mUserDataManager.openDataBase();
boolean flag = mUserDataManager.updateUserData(mUser);
if (flag == false) {
Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();
mUser.pwdresetFlag=1;
Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ;
startActivity(intent_Register_to_Login);
finish();
}
}
}else if(result==0){ //返回0说明用户名和密码不匹配，重新输入
Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
return;
}
}
}4：注销功能
注销功能直接在登录界面，当用户名和密码均正确时，点击注销按钮将直接注销用户【各位可根据需求将注销放在个人中心里面进行操作】。核心函数：
public void cancel() { //注销
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息
String userPwd = mPwd.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1说明用户名和密码均正确
Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//登录成功提示
mPwd.setText("");
mAccount.setText("");
mUserDataManager.deleteUserDatabyname(userName);
}else if(result==0){
Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //登录失败提示
}
}
}5：记住密码
当记住密码的RadioButton为真时，系统将记住此时用户登录的信息，用户在下次登录时可避免再次输入用户名和密码的麻烦，实现细节在Login的Activity中。这里给一个大牛用SharedPreferences做的记住密码连接：这里
三、工程源码下载
初学不久，工程代码中可能存在一些bug，望各位不吝指出，有个bug测试出来了，就是在记住密码之后对该账户进行密码修改后返回登录界面，此时记住的密码为原来的密码，不可登陆，我相信这个小bug是难不到你们的，^_^。
例程源码User_V2.0