安卓Android本地Sqlite實現註冊賬號和登入功能
阿新 • • 發佈：2019-01-09
實現了註冊賬號時將資料寫入本地SQLite，登入賬號時從本地SQLite匹配資料，並有記住密碼功能，以及通過改密口令（類似於密保問題）修改密碼的功能
思路很簡單，登入賬號的時候，先去資料庫匹配賬號，如果匹配到了相同賬號，再去匹配同一行的密碼，匹配成功則登入成功，匹配不成功則登入失敗。如果沒有匹配到賬號，則也是登入失敗。
註冊賬號的時候，先去匹配賬號是否存在，如果賬號存在，則提示賬號已經存在，如果資料庫中不存欲註冊的賬號，則允許註冊。
在註冊的時候，可以通過判斷輸入內容進行限制，如賬號格式，密碼位數，改密口令這些，我這裡只對密碼位數進行了限制。
如果賬號介面及登入介面都輸入了內容，則進行匹配：
接下來判斷login，如果允許登入，則再判斷有沒有勾選記住密碼：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;//賬號密碼是否匹配 //從資料庫中匹配賬號密碼 while (cursor.moveToNext()) { if (name.equals(cursor.getString(cursor.getColumnIndex("user"))) && pass.equals(cursor.getString(cursor.getColumnIndex("pass")))) {//使用者名稱匹配後才會去匹配密碼：&&邏輯的好處 login = true; break; } }
//如果匹配成功，判斷是否勾選記住賬號，並進行賬號資訊儲存 if (login) { SharedPreferences.Editor editor = getSharedPreferences("remember", MODE_PRIVATE).edit();//這裡利用SharedPreferences進行儲存 if (remember.isChecked()) {//如果勾選了記住密碼 editor.putBoolean("remember", true);//是否儲存了密碼，在這個Activity建立的時候先判斷此內容，如果為true則讀取並寫入輸入框，實現記住密碼 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 { //賬號密碼在資料庫中匹配不成功。即login==false Toast.makeText(this, "賬號與密碼不匹配", Toast.LENGTH_SHORT).show(); }
在建立Acitivity的時候，判斷是否儲存了密碼，如果儲存了，從而實現將儲存的密碼輸入到輸入框中，在Activity的onCreate方法中呼叫此方法就行了
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); } }
到這裡，登入功能就OK了，但是資料庫中根本沒有任何一條賬號資訊！於是，當然少不了註冊功能--往資料庫裡寫入賬號資訊！
建立一個註冊賬號的layout和activity，進行程式碼編寫
主要功能實現：當用戶輸入你所需求的資訊，並符合要求（如密碼不能低於6位等），接下來就去匹配資料庫了，首先判斷賬號是否已經存在於資料庫：
<pre name="code" class="java"> boolean creatUser=false;//是否允許建立使用者
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")))) {//如果在資料庫中找到了該賬號，則不允許建立
Toast.makeText(Register_Activity.this, "該賬戶已存在", Toast.LENGTH_SHORT).show();//彈一條吐司提醒使用者
creatUser = false;//不允許建立
}
}<pre name="code" class="java">if (creatUser) {//如果允許建立使用者<span style="white-space:pre"> </span>//將使用者資訊以鍵值對形式存貯在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);//插入資料<span style="white-space:pre"> </span>//註冊成功後彈出一個Dialog提示使用者
AlertDialog.Builder dialog = new AlertDialog.Builder(Register_Activity.this);
dialog.setTitle("註冊成功");
dialog.setMessage("您已成功註冊賬戶，請返回登入介面");<span style="white-space:pre"> </span>//設定確認按鈕，跳轉至登入介面
dialog.setPositiveButton("返回登入介面", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});<span style="white-space:pre"> </span>//設定取消按鈕，留在註冊介面
dialog.setNegativeButton("留在註冊介面", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
dialog.show();
}還有一個修改密碼（找回密碼）的功能：
由於手欠，將此功能寫在了一個自定義的Dialog裡，其實可以寫在Dialog型別的Activity中的，這裡我就不再修改了
首先驗證使用者是否完整輸入了我們改密所需要的各項內容，如果都輸入了，則在資料庫中匹配賬號，賬號匹配成功則再匹配改密口令，如果改密口令匹配成功，則修改密碼，程式碼如下：
<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);
//驗證賬號與改密口令是否相符
while (cursor.moveToNext()) {
if (userName.equals(cursor.getString(cursor.getColumnIndex("user")))&&
gmkl.equals(cursor.getString(cursor.getColumnIndex("reSetPass")))) {//如果賬號相符，則匹配改密口令，與登入類似
ContentValues values = new ContentValues();
values.put("pass", newPass);
db.update("user", values, "user=?", new String[]{userName});//更新密碼
Toast.makeText(context,"密碼修改成功！\n請牢記新密碼並使用新密碼登入",Toast.LENGTH_LONG).show();//彈出吐司提醒使用者
isReSetPassFinish=true;//改密工作完成
break;
}
}
//未成功匹配賬號&改密口令
if (!isReSetPassFinish){
Toast.makeText(context,"賬號不存在或改密口令錯誤",Toast.LENGTH_LONG).show();
}下面我就將這兩個Activity的程式碼以及修改密碼的程式碼無情的全部貼上來吧：
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;
/**
* 登入介面
* 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;
@Override
protected 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監聽器
*
* @param v
*/
@Override
public 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);
}
}
}
/**
* 登入賬號驗證
* 判斷是否勾選記住密碼
*/
private void Login() {
String name = et_Name.getText().toString();
String pass = et_Pass.getText().toString();
//判斷是否輸入內容
if (name.equals("") || pass.equals("")) {
Toast.makeText(this, "請輸入賬號或密碼", Toast.LENGTH_SHORT).show();
} else {//輸入了賬號&密碼
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;//賬號密碼是否匹配
//從資料庫中匹配賬號密碼
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，判斷是否勾選記住賬號，並進行賬號資訊儲存
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 {
//賬號密碼在資料庫中匹配不成功
Toast.makeText(this, "賬號與密碼不匹配", Toast.LENGTH_SHORT).show();
}
}
}
private void InitPopup() {
}
/**
* 判斷是否是否儲存過密碼
*/
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;
@Override
protected 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);
}
@Override
public 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, "請完整輸入各項註冊內容", Toast.LENGTH_SHORT).show();
} else if (!pass1.equals(pass2)) {
Toast.makeText(this, "兩次輸入密碼不一致，請重新輸入", Toast.LENGTH_SHORT).show();
} else if (pass1.length() < 6) {
Toast.makeText(this, "密碼小於六位數，請重新輸入", 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, "該賬戶已存在", 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("註冊成功");
dialog.setMessage("您已成功註冊賬戶，請返回登入介面");
dialog.setPositiveButton("返回登入介面", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
dialog.setNegativeButton("留在註冊介面", new DialogInterface.OnClickListener() {
@Override
public 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;
/**
* 修改密碼的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;
}
@Override
protected 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);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.bt_reSetGo:{
if (isReSetPass()){
dismiss();
}
}
break;
case R.id.bt_reSetCancel:{
cancel();
}
break;
}
}
/**
*
* 賬號與改密口令驗證
* 修改密碼
*
* @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();
//是否完整輸入各項內容
if (userName.equals("") || gmkl.equals("") || newPass.equals("")) {
Toast.makeText(context, "請輸入改密所需的每項內容", Toast.LENGTH_SHORT).show();
} else {//完整輸入了各項所需內容
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);
//驗證賬號與改密口令是否相符
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,"密碼修改成功！\n請牢記新密碼並使用新密碼登入",Toast.LENGTH_LONG).show();
isReSetPassFinish=true;
break;
}
}
//未成功匹配賬號&改密口令
if (!isReSetPassFinish){
Toast.makeText(context,"賬號不存在或改密口令錯誤",Toast.LENGTH_LONG).show();
}
}
return isReSetPassFinish;
}
}
應該很清楚了