編輯：關於Android編程
用戶登錄注冊界面開發及用戶信息管理案例詳解
剛開始接觸Android編程，這算是我寫的第一個簡單工程，主要功能有：用戶登錄、注冊、注銷、修改密碼、記住密碼共5個基本操作，其內容涉及到以下幾點：
1：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用；
2：多個Activities之間的切換；
3：使用Android本地數據庫來管理用戶信息。
先上幾個圖【我在android6.0.1的真機上調試的】：
下面是用戶登錄和用戶注冊界面。
下面是用戶密碼修改和個人中心界面。
這裡先貼出各個布局文件.xml，各個類內容和各個activity代碼：
register.xml【注冊界面】
resetpwd.xml【修改密碼界面】
user.xml【個人中心】
package com.example.foolishfan.user_v10;
public class UserData {
private String userName; //用戶名
private String userPwd; //用戶密碼
private int userId; //用戶ID號
public int pwdresetFlag=0;
//獲取用戶名
public String getUserName() { //獲取用戶名
return userName;
}
//設置用戶名
public void setUserName(String userName) { //輸入用戶名
this.userName = userName;
}
//獲取用戶密碼
public String getUserPwd() { //獲取用戶密碼
return userPwd;
}
//設置用戶密碼
public void setUserPwd(String userPwd) { //輸入用戶密碼
this.userPwd = userPwd;
}
//獲取用戶id
public int getUserId() { //獲取用戶ID號
return userId;
}
//設置用戶id
public void setUserId(int userId) { //設置用戶ID號
this.userId = userId;
}
public UserData(String userName, String userPwd) { //這裡只采用用戶名和密碼
super();
this.userName = userName;
this.userPwd = userPwd;
}
}
UserDataManager.java【用戶管理】
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 { //用戶數據管理類
//一些宏定義和聲明
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;
//創建用戶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繼承自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!");
}
//打開數據庫
public void openDataBase() throws SQLException {
mDatabaseHelper = new DataBaseManagementHelper(mContext);
mSQLiteDatabase = mDatabaseHelper.getWritableDatabase();
}
//關閉數據庫
public void closeDataBase() throws SQLException {
mDatabaseHelper.close();
}
//添加新用戶，即注冊
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);
}
//更新用戶信息，如修改密碼
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);
}
//根據id刪除用戶
public boolean deleteUserData(int id) {
return mSQLiteDatabase.delete(TABLE_NAME, ID + "=" + id, null) > 0;
}
//根據用戶名注銷
public boolean deleteUserDatabyname(String name) {
return mSQLiteDatabase.delete(TABLE_NAME, USER_NAME + "=" + name, null) > 0;
}
//刪除所有用戶
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;
}
//根據用戶名找用戶，可以判斷注冊時用戶名是否已經存在
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;
}
//根據用戶名和密碼找用戶，用於登錄
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;
}
}
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 { //登錄界面活動
public int pwdresetFlag=0;
private EditText mAccount; //用戶名編輯
private EditText mPwd; //密碼編輯
private Button mRegisterButton; //注冊按鈕
private Button mLoginButton; //登錄按鈕
private Button mCancleButton; //注銷按鈕
private CheckBox mRememberCheck;
private SharedPreferences login_sp;
private String userNameValue,passwordValue;
private View loginView; //登錄
private View loginSuccessView;
private TextView loginSuccessShow;
private TextView mChangepwdText;
private UserDataManager mUserDataManager; //用戶數據管理類
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//通過id找到相應的控件
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);
//如果上次選了記住密碼，那進入登錄頁面也自動勾選記住密碼，並填上用戶名和密碼
if(choseRemember){
mAccount.setText(name);
mPwd.setText(pwd);
mRememberCheck.setChecked(true);
}
mRegisterButton.setOnClickListener(mListener); //采用OnClickListener方法設置不同按鈕按下之後的監聽事件
mLoginButton.setOnClickListener(mListener);
mCancleButton.setOnClickListener(mListener);
mChangepwdText.setOnClickListener(mListener);
ImageView image = (ImageView) findViewById(R.id.logo); //使用ImageView顯示logo
image.setImageResource(R.drawable.logo);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地數據庫
}
}
OnClickListener mListener = new OnClickListener() { //不同按鈕按下的監聽事件選擇
public void onClick(View v) {
switch (v.getId()) {
case R.id.login_btn_register: //登錄界面的注冊按鈕
Intent intent_Login_to_Register = new Intent(Login.this,Register.class) ; //切換Login Activity至User Activity
startActivity(intent_Login_to_Register);
finish();
break;
case R.id.login_btn_login: //登錄界面的登錄按鈕
login();
break;
case R.id.login_btn_cancle: //登錄界面的注銷按鈕
cancel();
break;
case R.id.login_text_change_pwd: //登錄界面的注銷按鈕
Intent intent_Login_to_reset = new Intent(Login.this,Resetpwd.class) ; //切換Login Activity至User Activity
startActivity(intent_Login_to_reset);
finish();
break;
}
}
};
public void login() { //登錄按鈕監聽事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //獲取當前輸入的用戶名和密碼信息
String userPwd = mPwd.getText().toString().trim();
SharedPreferences.Editor editor =login_sp.edit();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1說明用戶名和密碼均正確
//保存用戶名和密碼
editor.putString("USER_NAME", userName);
editor.putString("PASSWORD", userPwd);
//是否記住密碼
if(mRememberCheck.isChecked()){
editor.putBoolean("mRememberCheck", true);
}else{
editor.putBoolean("mRememberCheck", false);
}
editor.commit();
Intent intent = new Intent(Login.this,User.class) ; //切換Login Activity至User Activity
startActivity(intent);
finish();
Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登錄成功提示
}else if(result==0){
Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登錄失敗提示
}
}
}
public void cancel() { //注銷
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //獲取當前輸入的用戶名和密碼信息
String userPwd = mPwd.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1說明用戶名和密碼均正確
Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//注銷成功提示
mPwd.setText("");
mAccount.setText("");
mUserDataManager.deleteUserDatabyname(userName);
}else if(result==0){
Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //注銷失敗提示
}
}
}
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();
}
}
Register.java【用戶注冊activity】
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; //用戶名編輯
private EditText mPwd; //密碼編輯
private EditText mPwdCheck; //密碼編輯
private Button mSureButton; //確定按鈕
private Button mCancelButton; //取消按鈕
private UserDataManager mUserDataManager; //用戶數據管理類
@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); //注冊界面兩個按鈕的監聽事件
mCancelButton.setOnClickListener(m_register_Listener);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地數據庫
}
}
View.OnClickListener m_register_Listener = new View.OnClickListener() { //不同按鈕按下的監聽事件選擇
public void onClick(View v) {
switch (v.getId()) {
case R.id.register_btn_sure: //確認按鈕的監聽事件
register_check();
break;
case R.id.register_btn_cancel: //取消按鈕的監聽事件,由注冊界面返回登錄界面
Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; //切換User Activity至Login Activity
startActivity(intent_Register_to_Login);
finish();
break;
}
}
};
public void register_check() { //確認按鈕的監聽事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd = mPwd.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
//檢查用戶是否存在
int count=mUserDataManager.findUserByName(userName);
//用戶已經存在時返回，給出提示文字
if(count>0){
Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
return ;
}
if(userPwd.equals(userPwdCheck)==false){ //兩次密碼輸入不一樣
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); //新建用戶信息
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) ; //切換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;
}
}
Resetpwd.java【重新設置密碼】
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; //用戶名編輯
private EditText mPwd_old; //密碼編輯
private EditText mPwd_new; //密碼編輯
private EditText mPwdCheck; //密碼編輯
private Button mSureButton; //確定按鈕
private Button mCancelButton; //取消按鈕
private UserDataManager mUserDataManager; //用戶數據管理類
@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); //注冊界面兩個按鈕的監聽事件
mCancelButton.setOnClickListener(m_resetpwd_Listener);
if (mUserDataManager == null) {
mUserDataManager = new UserDataManager(this);
mUserDataManager.openDataBase(); //建立本地數據庫
}
}
View.OnClickListener m_resetpwd_Listener = new View.OnClickListener() { //不同按鈕按下的監聽事件選擇
public void onClick(View v) {
switch (v.getId()) {
case R.id.resetpwd_btn_sure: //確認按鈕的監聽事件
resetpwd_check();
break;
case R.id.resetpwd_btn_cancel: //取消按鈕的監聽事件,由注冊界面返回登錄界面
Intent intent_Resetpwd_to_Login = new Intent(Resetpwd.this,Login.class) ; //切換Resetpwd Activity至Login Activity
startActivity(intent_Resetpwd_to_Login);
finish();
break;
}
}
};
public void resetpwd_check() { //確認按鈕的監聽事件
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說明用戶名和密碼均正確,繼續後續操作
if(userPwd_new.equals(userPwdCheck)==false){ //兩次密碼輸入不一樣
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) ; //切換User Activity至Login Activity
startActivity(intent_Register_to_Login);
finish();
}
}
}else if(result==0){ //返回0說明用戶名和密碼不匹配，重新輸入
Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
return;
}
}
}
public boolean isUserNameAndPwdValid() {
String userName = mAccount.getText().toString().trim();
//檢查用戶是否存在
int count=mUserDataManager.findUserByName(userName);
//用戶不存在時返回，給出提示文字
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;
}
}
User.java【用戶個人中心】
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();
}
}
上面工程涉及到的這些內容，在網上有很多寫的很有參考價值的資料，建議可單獨熟悉各個部分內容，然後添加功能到已有代碼基礎上，由於好多天後才整理的博客，缺少很多剛學習時遇到的種種錯誤及其解決方法，細節之處還望多交流。
<1>：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用
<2>：多個Activities之間的切換
<3>：使用Android本地數據庫來管理用戶信息
public void login() { //登錄按鈕監聽事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();//獲取當前輸入的用戶名和密碼信息
String userPwd = mPwd.getText().toString().trim();
SharedPreferences.Editor editor =login_sp.edit();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1說明用戶名和密碼均正確
//保存用戶名和密碼
editor.putString("USER_NAME", userName);
editor.putString("PASSWORD", userPwd);
//是否記住密碼
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();//登錄成功提示
}else if(result==0){
Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登錄失敗提示
}
}
}
登錄界面上點擊注冊按鈕，進入對應監聽事件，直接實現從Login的Activity到Register的Activity的跳轉，然後在Register的Activity上實現用戶注冊，核心函數：
public void register_check() { //確認按鈕的監聽事件
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim();
String userPwd = mPwd.getText().toString().trim();
String userPwdCheck = mPwdCheck.getText().toString().trim();
//檢查用戶是否存在
int count=mUserDataManager.findUserByName(userName);
//用戶已經存在時返回，給出提示文字
if(count>0){
Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
return ;
}
if(userPwd.equals(userPwdCheck)==false){ //兩次密碼輸入不一樣
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); //新建用戶信息
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();
}
}
}
}
在登錄界面點擊“修改密碼”即可進入對應的Resetpwd的Activity，實現用戶密碼的修改，核心函數：
public void resetpwd_check() { //確認按鈕的監聽事件
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說明用戶名和密碼均正確,繼續後續操作
if(userPwd_new.equals(userPwdCheck)==false){ //兩次密碼輸入不一樣
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說明用戶名和密碼不匹配，重新輸入
Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
return;
}
}
}
注銷功能直接在登錄界面，當用戶名和密碼均正確時，點擊注銷按鈕將直接注銷用戶【各位可根據需求將注銷放在個人中心裡面進行操作】。核心函數：
public void cancel() { //注銷
if (isUserNameAndPwdValid()) {
String userName = mAccount.getText().toString().trim(); //獲取當前輸入的用戶名和密碼信息
String userPwd = mPwd.getText().toString().trim();
int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
if(result==1){ //返回1說明用戶名和密碼均正確
Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//登錄成功提示
mPwd.setText("");
mAccount.setText("");
mUserDataManager.deleteUserDatabyname(userName);
}else if(result==0){
Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //登錄失敗提示
}
}
}
當記住密碼的RadioButton為真時，系統將記住此時用戶登錄的信息，用戶在下次登錄時可避免再次輸入用戶名和密碼的麻煩，實現細節在Login的Activity中。
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