Android+本地记事本(上)------实现登陆注册

Android+本地记事本(上)------实现登陆注册

开发工具：Android Studio3.1.3

数据库：SQLite

本篇博客写作时间：2018年6月28日

总源码下载地址  点击打开链接 

若点击无法打开请访问：https://download.csdn.net/download/dear_uu/10505105

前言 ：本人刚开始学习Android，若有mistake请留言指正，不胜感激，不足之处还请多多海涵。

转载还请著明出处，谢谢。

一：欢迎界面

布局：welcome_layout.xml

很简单，就是一个背景图片而已：

活动：WelcomeActivity.java

下面是主要的代码，实现了一个欢迎界面停留2秒，进入登录界面

public class WeclomeActivity extends Activity {

    public static final long DELAY_TIME = 2000L;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.welcome_layout);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                startActivity(new Intent(WeclomeActivity.this, LoginActivity.class));
                finish();
            }
        }, DELAY_TIME);
    }
}

二: 登录界面

布局：login_layout.xml

从下面的代码不难看出，就是简单的LinearLayout的嵌套了，美化了一下，并修改了系统默认的骚气的粉红色为亮蓝色(style.xml文件中进行修改)。

对Button进行了一个border的封装，这里就不详细说明了。

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/loginbg_icon"
    android:orientation="vertical"
    android:weightSum="1">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="400dp">LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_weight="0.73"
        android:orientation="vertical">

        <EditText
            android:id="@+id/phone_text"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:digits="0,1,2,3,4,5,6,7,8,9"
            android:hint="Phone"
            android:inputType="number"
            android:maxLength="11"
            android:textColor="@android:color/holo_blue_light" />

        <EditText
            android:id="@+id/password_text"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:digits="0,1,2,3,4,5,6,7,8,9,qwertyuiopasdfghjklzxcvbnm,_,."
            android:hint="Password"
            android:inputType="numberPassword"
            android:maxLength="18"
            android:textColor="@android:color/holo_blue_light" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:orientation="horizontal"
            android:weightSum="1">

            <CheckBox
                android:id="@+id/remember_pass"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Remember Password"
                android:textColor="@android:color/holo_blue_light" />
        LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:orientation="horizontal"
            android:weightSum="1">

            <Button
                android:id="@+id/signUp_btn"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="60dp"
                android:background="@drawable/button_selector_draw"
                android:text="Sign Up"
                android:textAllCaps="false"
                android:textColor="@android:color/holo_blue_light" />

            <Button
                android:id="@+id/signIn_btn"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/button_selector_draw"
                android:text="Sign In"
                android:textAllCaps="false"
                android:textColor="@android:color/holo_blue_light" />
        LinearLayout>
    LinearLayout>
LinearLayout>

活动：LoginActivity.java

下面是主要的代码,实现了记住密码，感觉没啥好说的，有疑问的话评论中问吧。

public class LoginActivity extends Activity implements View.OnClickListener {

    private static final int REQUEST_CODE_GO_TO_REGIST = 100;
    private EditText edit_account, edit_password;
    private Button btn_signIn, btn_signUp;
    private String account, password;
    private CheckBox box_rememberpsw;
    private DBHelper dbHelper = new DBHelper(this);
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;
    private static final long DELAY_TIME = 2000L;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.login_layout);
        init();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case REQUEST_CODE_GO_TO_REGIST:
                if (resultCode == RESULT_OK) {
                    String name = data.getStringExtra("Phone");
                    String psw = data.getStringExtra("Password");
                    edit_account.setText(name);
                    edit_password.setText(psw);
                }
                break;
        }
    }

    private void init() {
        edit_account = (EditText) findViewById(R.id.phone_text);
        edit_account.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                return false;
            }
        });
        edit_password = (EditText) findViewById(R.id.password_text);
        box_rememberpsw = (CheckBox) findViewById(R.id.remember_pass);
        box_rememberpsw = (CheckBox) findViewById(R.id.remember_pass);
        btn_signIn = (Button) findViewById(R.id.signIn_btn);
        btn_signUp = (Button) findViewById(R.id.signUp_btn);
        btn_signIn.setOnClickListener(this);
        btn_signUp.setOnClickListener(this);
        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        boolean isRemember = sharedPreferences.getBoolean("remember_password", false);
        if (isRemember) {
            String name = sharedPreferences.getString("Account", "");
            String psw = sharedPreferences.getString("Password", "");
            edit_account.setText(name);
            edit_password.setText(psw);
            box_rememberpsw.setChecked(true);
        }
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.signUp_btn:
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivityForResult(intent, REQUEST_CODE_GO_TO_REGIST);
                break;
            case R.id.signIn_btn:
                if (edit_account.getText().toString().equals("") ||
                        edit_password.getText().toString().trim().equals("")) {
                    Toast.makeText(LoginActivity.this, "手机号或密码不能为空！", Toast.LENGTH_SHORT).show();
                } else {
                    readUserInfo();
                }
                break;
        }
    }

    private void readUserInfo() {
        account = edit_account.getText().toString();
        password = edit_password.getText().toString().trim();
        editor = sharedPreferences.edit();
        if (login(account, password)) {
            if (box_rememberpsw.isChecked()) {
                editor.putBoolean("remember_password", true);
                editor.putString("Account", account);
                editor.putString("Password", password);
            } else {
                editor.clear();
            }
            editor.apply();
            Toast.makeText(LoginActivity.this, "登录成功!", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            intent.putExtra("UserPhone", account);
            startActivity(intent);
            finish();
        } else {
            Toast.makeText(LoginActivity.this, "手机号或密码错误，请重新输入！", Toast.LENGTH_SHORT).show();
        }
    }

    private boolean login(String account, String password) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        String sql = "select * from " + USER_TABLE + " where " + PHONE + "=? and " + PASSWORD + "=?";
        Cursor cursor = db.rawQuery(sql, new String[]{account, password});
        if (cursor.moveToFirst()) {
            cursor.close();
            return true;
        }
        return false;
    }
}

三: 注册界面

布局：register_layout.xml

注册成功后会把手机号和密码传回登陆界面

活动：RegisterActivity.java

public class RegisterActivity extends Activity implements View.OnClickListener {

    private static final int MAX_SIZE = 11;
    private EditText edit_setPhone, edit_setPassword, edit_resetPassword;
    private Button btn_confirm, btn_cancel;
    private DBHelper dbHelper;
    private String phone, password, passwordAgain;
    private DBManager dbManager;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.register_layout);
        init();
    }

    private void init() {
        dbHelper = new DBHelper(this);
        edit_setPhone = (EditText) findViewById(R.id.phone_text);
        edit_setPhone.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                return false;
            }
        });
        edit_setPassword = (EditText) findViewById(R.id.password_text);
        edit_resetPassword = (EditText) findViewById(R.id.passwordagain_text);
        btn_confirm = (Button) findViewById(R.id.signUp_btn);
        btn_confirm.setOnClickListener(this);
        btn_cancel = (Button) findViewById(R.id.cancel_btn);
        btn_cancel.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.cancel_btn:
                Intent intent = new Intent(RegisterActivity.this, LoginActivity.class);
                startActivity(intent);
                break;
            case R.id.signUp_btn:
                phone = edit_setPhone.getText().toString();
                password = edit_setPassword.getText().toString().trim();
                passwordAgain = edit_resetPassword.getText().toString().trim();

                Log.d("phone+",phone);
                Log.d("phone++",password);
                Log.d("phone++",passwordAgain);

                if (phone.equals("") || password.equals("") || passwordAgain.equals("")) {
                    Toast.makeText(RegisterActivity.this, "不能为空！", Toast.LENGTH_SHORT).show();
                } else {
                    if (phone.length() != MAX_SIZE) {
                        Toast.makeText(RegisterActivity.this, "非法的手机号,请重新输入！", Toast.LENGTH_SHORT).show();
                    } else {
                        if (CheckIsDataAlreadyInDBOrNot(phone)) {
                            Toast.makeText(RegisterActivity.this, "该手机号已被注册，注册失败！", Toast.LENGTH_SHORT).show();
                        } else {
                            if (password.equals(passwordAgain)) {
                                RegisterUserInfo(phone, password);
                                Toast.makeText(RegisterActivity.this, "注册成功！", Toast.LENGTH_SHORT).show();
                                Intent intent_1 = new Intent(RegisterActivity.this, LoginActivity.class);
                                intent_1.putExtra("Phone", phone);
                                intent_1.putExtra("Password", password);
                                setResult(RESULT_OK, intent_1);
                                finish();
                            } else {
                                Toast.makeText(RegisterActivity.this, "两次输入密码不一致！", Toast.LENGTH_SHORT).show();
                            }
                        }
                    }
                }
                break;
        }
    }

    private void RegisterUserInfo(String phone, String password) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(PHONE, phone);
        values.put(PASSWORD, password);
        db.insert(USER_TABLE, null, values);
        db.close();
    }

    private boolean CheckIsDataAlreadyInDBOrNot(String phone) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        String sql = "select * from "+USER_TABLE+" where "+PHONE+"=?";
        Cursor c = db.rawQuery(sql, new String[]{phone});
        if (c.getCount() > 0) {
            c.close();
            return true;
        }
        c.close();
        return false;
    }
}

四：数据库SQlite新建表

BDHelper.java

public class DBHelper extends SQLiteOpenHelper {

    public static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "Date.db";
    public static final String USER_TABLE = "usersinfo";
    public static final String PHONE = "userphone";
    public static final String PASSWORD = "password";

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //新建用户信息表
        db.execSQL("CREATE TABLE " + USER_TABLE + " ("
                + PHONE + " TEXT PRIMARY KEY, "
                + PASSWORD + " TEXT) ");
            }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("alter table " + USER_TABLE + " add column other string");
    }
}

好了，先到这里吧，源码地址：在上面，希望对看文章的你会有帮助。