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：

<?xml version="1.0" encoding="utf-8"?>

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

<?xml version="1.0" encoding="utf-8"?>

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。

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

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