安卓Android本地Sqlite实现注册账号和登录功能

实现了注册账号时将数据写入本地SQLite，登录账号时从本地SQLite匹配数据，并有记住密码功能，以及通过改密口令（类似于密保问题）修改密码的功能思路很简单，登录账号的时候，先去数据库匹配账号，如果匹配到了相同账号，再去匹配同一行的密码，匹配成功则登录成功，匹配不成功则登录失败。如果没有匹配到账号，则也是登录失败。注册账号的时候，先去匹配账号是否存在，如果账号存在，则提示账号已经存在，如果数据库中不存欲注册的账号，则允许注册。在注册的时候，可以通过判断输入内容进行限制，如账号格式，密码位数，改密口令这些，我这里只对密码位数进行了限制。如果账号界面及登录界面都输入了内容，则进行匹配：db = new RegisterHelper(this, "user", null, RegisterHelper.REGISTER_DB_VERSION).getReadableDatabase();Cursor cursor = db.query("user", new String[]{"user", "pass"}, null, null, null, null, null);boolean login = false;//账号密码是否匹配//从数据库中匹配账号密码while (cursor.moveToNext()) {if (name.equals(cursor.getString(cursor.getColumnIndex("user")))&& pass.equals(cursor.getString(cursor.getColumnIndex("pass")))) {//用户名匹配后才会去匹配密码：&&逻辑的好处login = true;break;}}接下来判断login，如果允许登录，则再判断有没有勾选记住密码：//如果匹配成功，判断是否勾选记住账号，并进行账号信息存储if (login) {SharedPreferences.Editor editor = getSharedPreferences("remember", MODE_PRIVATE).edit();//这里利用SharedPreferences进行存储if (remember.isChecked()) {//如果勾选了记住密码editor.putBoolean("remember", true);//是否保存了密码，在这个Activity创建的时候先判断此内容，如果为true则读取并写入输入框，实现记住密码editor.putString("name", name);editor.putString("pass", pass);editor.commit();} else {editor.clear();}editor.commit();Intent intent = new Intent(this, Main_Activity.class);startActivity(intent);} else {//账号密码在数据库中匹配不成功。即login==falseToast.makeText(this, "账号与密码不匹配", Toast.LENGTH_SHORT).show();}在创建Acitivity的时候，判断是否保存了密码，如果保存了，从而实现将保存的密码输入到输入框中，在Activity的onCreate方法中调用此方法就行了private void isRemember() {SharedPreferences prefer = getSharedPreferences("remember", MODE_PRIVATE);boolean isRemember = prefer.getBoolean("remember", false);if (isRemember) {et_Name.setText(prefer.getString("name", ""));et_Pass.setText(prefer.getString("pass", ""));remember.setChecked(true);}}到这里，登录功能就OK了，但是数据库中根本没有任何一条账号信息！于是，当然少不了注册功能--往数据库里写入账号信息！创建一个注册账号的layout和activity，进行代码编写主要功能实现：当用户输入你所需求的信息，并符合要求（如密码不能低于6位等），接下来就去匹配数据库了，首先判断账号是否已经存在于数据库：<pre name="code" class="java"> boolean creatUser=false;//是否允许创建用户dbHelper = new RegisterHelper(Register_Activity.this, "user", null, 1);SQLiteDatabase db = dbHelper.getWritableDatabase();Cursor cursor = db.query("user", new String[]{"user"}, null, null, null, null, null);while (cursor.moveToNext()) {if (user_name.equals(cursor.getString(cursor.getColumnIndex("user")))) {//如果在数据库中找到了该账号，则不允许创建Toast.makeText(Register_Activity.this, "该账户已存在", Toast.LENGTH_SHORT).show();//弹一条吐司提醒用户creatUser = false;//不允许创建}}接下来判断creatUser到底允许不允许创建用户，从而实现向数据库写入账号信息的逻辑：

<pre name="code" class="java">if (creatUser) {//如果允许创建用户

<span style="white-space:pre">		</span>//将用户信息以键值对形式存贮在ContentValues中ContentValues values = new ContentValues();values.put("user", user_name);values.put("pass", pass1);values.put("name", name);values.put("reSetPass", gmkl);db.insert("user", null, values);//插入数据

<span style="white-space:pre">		</span>//注册成功后弹出一个Dialog提示用户AlertDialog.Builder dialog = new AlertDialog.Builder(Register_Activity.this);dialog.setTitle("注册成功");dialog.setMessage("您已成功注册账户，请返回登录界面");

<span style="white-space:pre">		</span>//设置确认按钮，跳转至登录界面dialog.setPositiveButton("返回登录界面", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {finish();}});

<span style="white-space:pre">		</span>//设置取消按钮，留在注册界面dialog.setNegativeButton("留在注册界面", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}});dialog.show();}

到这里，登录和注册功能就实现了！还有一个修改密码（找回密码）的功能：由于手欠，将此功能写在了一个自定义的Dialog里，其实可以写在Dialog类型的Activity中的，这里我就不再修改了首先验证用户是否完整输入了我们改密所需要的各项内容，如果都输入了，则在数据库中匹配账号，账号匹配成功则再匹配改密口令，如果改密口令匹配成功，则修改密码，代码如下：<span style="white-space:pre"> </span> db = new RegisterHelper(context, "user", null, RegisterHelper.REGISTER_DB_VERSION).getReadableDatabase();Cursor cursor = db.query("user", new String[]{"user", "reSetPass"}, null, null, null, null, null);//验证账号与改密口令是否相符while (cursor.moveToNext()) {if (userName.equals(cursor.getString(cursor.getColumnIndex("user")))&&gmkl.equals(cursor.getString(cursor.getColumnIndex("reSetPass")))) {//如果账号相符，则匹配改密口令，与登录类似ContentValues values = new ContentValues();values.put("pass", newPass);db.update("user", values, "user=?", new String[]{userName});//更新密码Toast.makeText(context,"密码修改成功！\n请牢记新密码并使用新密码登录",Toast.LENGTH_LONG).show();//弹出吐司提醒用户isReSetPassFinish=true;//改密工作完成break;}}//未成功匹配账号&改密口令if (!isReSetPassFinish){Toast.makeText(context,"账号不存在或改密口令错误",Toast.LENGTH_LONG).show();}下面我就将这两个Activity的代码以及修改密码的代码无情的全部贴上来吧：LoginActivity：package com.example.application.activity;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.view.View;import android.view.Window;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageView;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.Toast;import com.example.application.Dialog.ReSetPass_Dialog;import com.example.application.R;import com.example.application.db.RegisterHelper;/*** 登录界面* Created by lxb on 2016/5/13.*/public class Login_Activity extends Activity implements View.OnClickListener {private Button bt_login;private Button bt_cancel;private Button bt_register;private Button bt_reSetPass;private EditText et_Name;private EditText et_Pass;private CheckBox remember;private ImageView showUserName;private SQLiteDatabase db;private PopupWindow popup;private ArrayAdapter<String> popupAdpter;private ListView popupLV;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.login_layout);bt_login = (Button) findViewById(R.id.bt_login);bt_cancel = (Button) findViewById(R.id.bt_cancel);bt_register = (Button) findViewById(R.id.bt_register);bt_reSetPass = (Button) findViewById(R.id.bt_reSetPass);et_Name = (EditText) findViewById(R.id.et_loginName);et_Pass = (EditText) findViewById(R.id.et_loginPass);remember = (CheckBox) findViewById(R.id.cb_rememberName);showUserName = (ImageView) findViewById(R.id.iv_showName);showUserName.setOnClickListener(this);bt_login.setOnClickListener(this);bt_cancel.setOnClickListener(this);bt_register.setOnClickListener(this);bt_reSetPass.setOnClickListener(this);isRemember();}/*** Button监听器** @param v*/@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bt_login: {Login();}break;case R.id.bt_register: {Intent intent = new Intent(Login_Activity.this, Register_Activity.class);startActivity(intent);}break;case R.id.iv_showName: {InitPopup();}break;case R.id.bt_reSetPass: {ReSetPass_Dialog dialog=new ReSetPass_Dialog(this);dialog.show();}break;case R.id.bt_cancel: {System.exit(0);}}}/*** 登录账号验证* 判断是否勾选记住密码*/private void Login() {String name = et_Name.getText().toString();String pass = et_Pass.getText().toString();//判断是否输入内容if (name.equals("") || pass.equals("")) {Toast.makeText(this, "请输入账号或密码", Toast.LENGTH_SHORT).show();} else {//输入了账号&密码db = new RegisterHelper(this, "user", null, RegisterHelper.REGISTER_DB_VERSION).getReadableDatabase();Cursor cursor = db.query("user", new String[]{"user", "pass"}, null, null, null, null, null);boolean login = false;//账号密码是否匹配//从数据库中匹配账号密码while (cursor.moveToNext()) {if (name.equals(cursor.getString(cursor.getColumnIndex("user")))&& pass.equals(cursor.getString(cursor.getColumnIndex("pass")))) {login = true;break;}}//如果匹配成功，判断是否勾选记住账号，并进行账号信息存储if (login) {SharedPreferences.Editor editor = getSharedPreferences("remember", MODE_PRIVATE).edit();if (remember.isChecked()) {editor.putBoolean("remember", true);editor.putString("name", name);editor.putString("pass", pass);editor.commit();} else {editor.clear();}editor.commit();Intent intent = new Intent(this, Main_Activity.class);startActivity(intent);} else {//账号密码在数据库中匹配不成功Toast.makeText(this, "账号与密码不匹配", Toast.LENGTH_SHORT).show();}}}private void InitPopup() {}/*** 判断是否是否保存过密码*/public void isRemember() {SharedPreferences prefer = getSharedPreferences("remember", MODE_PRIVATE);boolean isRemember = prefer.getBoolean("remember", false);if (isRemember) {et_Name.setText(prefer.getString("name", ""));et_Pass.setText(prefer.getString("pass", ""));remember.setChecked(true);}}}RegisterActivity：package com.example.application.activity;import android.app.Activity;import android.content.ContentValues;import android.content.DialogInterface;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.support.v7.app.AlertDialog;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.example.application.R;import com.example.application.db.RegisterHelper;/*** Created by lxb on 2016/5/14.*/public class Register_Activity extends Activity implements View.OnClickListener {private Button register_go;private Button register_cancel;private EditText register_user_name;private EditText register_user_pass1;private EditText register_user_pass2;private EditText register_name;private EditText register_gmkl;private RegisterHelper dbHelper;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.register_layout);register_user_name = (EditText) findViewById(R.id.register_user_name);register_user_pass1 = (EditText) findViewById(R.id.register_pass1);register_user_pass2 = (EditText) findViewById(R.id.register_pass2);register_name = (EditText) findViewById(R.id.register_name);register_gmkl = (EditText) findViewById(R.id.register_gmkl);register_go = (Button) findViewById(R.id.register_go);register_cancel = (Button) findViewById(R.id.register_cancel);register_go.setOnClickListener(this);register_cancel.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.register_go: {RegisterSave();}break;case R.id.register_cancel: {finish();}}}private void RegisterSave() {String user_name = register_user_name.getText().toString();String pass1 = register_user_pass1.getText().toString();String pass2 = register_user_pass2.getText().toString();String name = register_name.getText().toString();String gmkl = register_gmkl.getText().toString();boolean creatUser = true;if (user_name.equals("") || pass1.equals("") || pass2.equals("") || name.equals("") || gmkl.equals("")) {Toast.makeText(this, "请完整输入各项注册内容", Toast.LENGTH_SHORT).show();} else if (!pass1.equals(pass2)) {Toast.makeText(this, "两次输入密码不一致，请重新输入", Toast.LENGTH_SHORT).show();} else if (pass1.length() < 6) {Toast.makeText(this, "密码小于六位数，请重新输入", Toast.LENGTH_SHORT).show();} else {dbHelper = new RegisterHelper(Register_Activity.this, "user", null, 1);SQLiteDatabase db = dbHelper.getWritableDatabase();Cursor cursor = db.query("user", new String[]{"user"}, null, null, null, null, null);while (cursor.moveToNext()) {if (user_name.equals(cursor.getString(cursor.getColumnIndex("user")))) {Toast.makeText(Register_Activity.this, "该账户已存在", Toast.LENGTH_SHORT).show();creatUser = false;}}if (creatUser) {ContentValues values = new ContentValues();values.put("user", user_name);values.put("pass", pass1);values.put("name", name);values.put("reSetPass", gmkl);db.insert("user", null, values);AlertDialog.Builder dialog = new AlertDialog.Builder(Register_Activity.this);dialog.setTitle("注册成功");dialog.setMessage("您已成功注册账户，请返回登录界面");dialog.setPositiveButton("返回登录界面", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {finish();}});dialog.setNegativeButton("留在注册界面", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}});dialog.show();}}}}ReSetPass_Dialog：package com.example.application.Dialog;import android.app.Dialog;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.example.application.R;import com.example.application.db.RegisterHelper;/*** 修改密码的Dialog* Created by lxb on 2016/5/15.*/public class ReSetPass_Dialog extends Dialog implements View.OnClickListener{private Context context;private EditText et_reSetUserName;private EditText et_reSetGmkl;private EditText et_reSetNewPass;private Button bt_reSetGo;private Button bt_reSetCancel;private SQLiteDatabase db;public ReSetPass_Dialog(Context context) {super(context);this.context=context;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.resetpass_dialog);et_reSetGmkl = (EditText) findViewById(R.id.et_reSetGmkl);et_reSetUserName = (EditText) findViewById(R.id.et_reSetUserName);et_reSetNewPass = (EditText) findViewById(R.id.et_reSetNewPass);bt_reSetGo= (Button) findViewById(R.id.bt_reSetGo);bt_reSetCancel= (Button) findViewById(R.id.bt_reSetCancel);bt_reSetGo.setOnClickListener(this);bt_reSetCancel.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.bt_reSetGo:{if (isReSetPass()){dismiss();}}break;case R.id.bt_reSetCancel:{cancel();}break;}}/**** 账号与改密口令验证* 修改密码** @return 是否完成完成改密工作*/private boolean isReSetPass() {boolean isReSetPassFinish=false;String userName = et_reSetUserName.getText().toString();String gmkl = et_reSetGmkl.getText().toString();String newPass = et_reSetNewPass.getText().toString();//是否完整输入各项内容if (userName.equals("") || gmkl.equals("") || newPass.equals("")) {Toast.makeText(context, "请输入改密所需的每项内容", Toast.LENGTH_SHORT).show();} else {//完整输入了各项所需内容db = new RegisterHelper(context, "user", null, RegisterHelper.REGISTER_DB_VERSION).getReadableDatabase();Cursor cursor = db.query("user", new String[]{"user", "reSetPass"}, null, null, null, null, null);//验证账号与改密口令是否相符while (cursor.moveToNext()) {if (userName.equals(cursor.getString(cursor.getColumnIndex("user")))&&gmkl.equals(cursor.getString(cursor.getColumnIndex("reSetPass")))) {ContentValues values = new ContentValues();values.put("pass", newPass);db.update("user", values, "user=?", new String[]{userName});Toast.makeText(context,"密码修改成功！\n请牢记新密码并使用新密码登录",Toast.LENGTH_LONG).show();isReSetPassFinish=true;break;}}//未成功匹配账号&改密口令if (!isReSetPassFinish){Toast.makeText(context,"账号不存在或改密口令错误",Toast.LENGTH_LONG).show();}}return isReSetPassFinish;}}应该很清楚了