Android开发 登录注册设计

用Android Studio 简单的实现登录注册

目录

一、登录界面

activity_login.xml 布局代码：

login.java 代码： 

二、注册界面 

activity_register.xml布局代码：

register.java 代码：

三、修改密码（忘记密码 ？)

activity_update_password.xml布局代码：

UpdatePassword.java 代码：

四、SQLite 与 SharedPreferences 操作

QQHelper.java 创建SQLite数据库：

QQperate.java 对SQLite数据库进行增、改、查操作：

SaveQQ.java保存QQ账号与密码：

五、登录成功界面

六、 styles.xml 和AndroidManifest.xml

styles.xml 代码：

AndroidManifest.xml 代码：

一、登录界面

activity_login.xml 布局代码：

login.java 代码： 

package com.example.datastorage;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import android.annotation.SuppressLint;import android.content.Intent;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import java.util.Map;import java.util.Timer;import java.util.TimerTask;public class login extends AppCompatActivity implements View.OnClickListener {    QQHelper qqHelper;    private EditText login_z, login_m;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        qqHelper = new QQHelper(login.this);//        login.this.deleteDatabase("qq.db");        init();        Outdate();    }    private void init() {        login_z = findViewById(R.id.login_z);        login_m = findViewById(R.id.login_m);        Button bt_reGISter = findViewById(R.id.bt_register);        Button bt_xpassWord = findViewById(R.id.bt_xpassword);        Button bt_login = findViewById(R.id.bt_login);        bt_register.setOnClickListener(this);        bt_xpassword.setOnClickListener(this);        bt_login.setOnClickListener(this);    }    private void Outdate() {        Map map = SaveQQ.getUserInfo(login.this);        String account = map.get("account");        String password = map.get("password");        login_z.setText(account);        login_m.setText(password);    }    @SuppressLint("NonConstantResourceId")    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.bt_register: {                Intent intent = new Intent(login.this , register.class);                startActivity(intent);                finish();                break;            }            case R.id.bt_xpassword: {                Intent intent = new Intent(login.this , UpdatePassword.class);                startActivity(intent);                finish();                break;            }            case R.id.bt_login: {                String account = login_z.getText().toString().trim();                String password = login_m.getText().toString();                Log.i("debug","登录按钮");                if(TextUtils.isEmpty(account) || TextUtils.isEmpty(password)) {                    Toast.makeText(this, "账号和密码不能为空", Toast.LENGTH_SHORT).show();                    break;                }                int f = QQperate.query(login.this, account, password);                if(f == 1) {                    Intent intent = new Intent(login.this , zhujianActivity.class);                    SaveQQ.SaveUserInfo(login.this, account, password);                    Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();                    startActivity(intent);                    finish();                } else {                    Toast.makeText(this, "账号或密码错误", Toast.LENGTH_SHORT).show();                }                break;            }        }    }}

二、注册界面 

activity_register.xml布局代码：

register.java 代码：

package com.example.datastorage;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class register extends AppCompatActivity {    private EditText register_z, register_m, register_am, register_pnum;    private ImageView back;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_register);        init();    }    private void init() {        register_z = findViewById(R.id.register_z);        register_pnum = findViewById(R.id.register_pnum);        register_m = findViewById(R.id.register_m);        register_am = findViewById(R.id.register_am);        Button bt_rGCommit = findViewById(R.id.bt_rgcommit);        back = findViewById(R.id.register_back);        back.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                result();            }        });        bt_rgcommit.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                String account = register_z.getText().toString();                String num = register_pnum.getText().toString().trim();                String password = register_m.getText().toString();                String apassword = register_am.getText().toString();                if(TextUtils.isEmpty(account)) {                    Toast.makeText(register.this, "账号不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if(TextUtils.isEmpty(num)) {                    Toast.makeText(register.this, "号码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if(TextUtils.isEmpty(password)) {                    Toast.makeText(register.this, "密码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if(TextUtils.isEmpty(apassword)) {                    Toast.makeText(register.this, "确认密码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if(!password.equals(apassword)) {                    Toast.makeText(register.this, "密码和确认密码不相同", Toast.LENGTH_SHORT).show();                    return;                }                int f = QQperate.insert(register.this, account, num, password);                if (f == 1) {                    SaveQQ.SaveUserInfo(register.this , account, password);                    Toast.makeText(register.this, "注册成功", Toast.LENGTH_SHORT).show();                } else {                    Toast.makeText(register.this, "注册失败，账号或者号码已存在", Toast.LENGTH_SHORT).show();                }            }        });    }    private void result() {        Intent intent = new Intent(register.this , login.class);        startActivity(intent);        finish();    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if(keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {            result();        }        return false;    }}

三、修改密码（忘记密码 ？)

activity_update_password.xml布局代码：

UpdatePassword.java 代码：

package com.example.datastorage;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.text.TextUtils;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;import java.util.Map;public class UpdatePassword extends AppCompatActivity {    private EditText up_pnum, up_m, up_am;    private ImageView back;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_update_password);        init();    }    private void init() {        up_pnum = findViewById(R.id.up_pnum);        up_m = findViewById(R.id.up_m);        up_am = findViewById(R.id.up_am);        Button bt_upcommit = findViewById(R.id.bt_upcommit);        back = findViewById(R.id.password_back);        back.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                result();            }        });        bt_upcommit.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                String num = up_pnum.getText().toString().trim();                String password = up_m.getText().toString();                String apassword = up_am.getText().toString();                if (TextUtils.isEmpty(num)) {                    Toast.makeText(UpdatePassword.this, "号码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if (TextUtils.isEmpty(password)) {                    Toast.makeText(UpdatePassword.this, "新密码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if (TextUtils.isEmpty(apassword)) {                    Toast.makeText(UpdatePassword.this, "确认密码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                if (!password.equals(apassword)) {                    Toast.makeText(UpdatePassword.this, "确认密码不能为空", Toast.LENGTH_SHORT).show();                    return;                }                int f = QQperate.update(UpdatePassword.this , num, password);                if(f == 1) {                    Map map = QQperate.queryUp(UpdatePassword.this , num);                    SaveQQ.SaveUserInfo(UpdatePassword.this , map.get("account"), map.get("password"));                    Toast.makeText(UpdatePassword.this, "修改成功", Toast.LENGTH_SHORT).show();                } else {                    Toast.makeText(UpdatePassword.this, "修改失败", Toast.LENGTH_SHORT).show();                }            }        });    }    private void result() {        Intent intent = new Intent(UpdatePassword.this , login.class);        startActivity(intent);        finish();    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if(keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {            result();        }        return false;    }}

四、SQLite 与 SharedPreferences 操作

SQlite数据库存储主要用来保存用户信息，SharedPreferences存储主要用来实现记录账号与密码的功能，方便下次登录。

QQHelper.java 创建SQLite数据库：

package com.example.datastorage;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import androidx.annotation.Nullable;public class QQHelper extends SQLiteOpenHelper {    public QQHelper(@Nullable Context context) {        super(context, "qq.db", null, 1);    }    @Override    public void onCreate(SQLiteDatabase sqLiteDatabase) {        String sql = "create table user(_id Integer primary key AUTOINCREMENT,  account varchar(20) , num varchar(20), password varchar(20))";        sqLiteDatabase.execSQL(sql);    }    @Override    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {    }}

QQperate.java 对SQLite数据库进行增、改、查操作：

package com.example.datastorage;import android.annotation.SuppressLint;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.util.Log;import java.util.HashMap;import java.util.Map;public class QQperate {    //添加用户    public static int insert(Context context, String account, String num, String password) {        QQHelper qqHelper = new QQHelper(context);        SQLiteDatabase db = qqHelper.getWritableDatabase();        ContentValues values = new ContentValues();        values.put("account",account);        values.put("num",num);        values.put("password",password);        String sql = "select * from user where account=? or num=?";        Cursor cursor = db.rawQuery(sql, new String[]{account, num});        int f = 0;        if(cursor.getCount() == 0) {            db.insert("user",null,values);            f = 1;        }        db.close();        cursor.close();        return f;    }    //修改密码    public static int update(Context context, String num, String password) {        QQHelper qqHelper = new QQHelper(context);        SQLiteDatabase db = qqHelper.getWritableDatabase();        String sql = "update user set password=? where num=?";        Cursor cursor = db.query("user",null,"num=?",new String[]{num},null,null,null);        int f = 0;        if(cursor.getCount() != 0) {            db.execSQL(sql,new String[]{password, num});            f = 1;        }        db.close();        cursor.close();        return f;    }    //查询用户    public static int query(Context context, String account, String password) {        QQHelper qqHelper = new QQHelper(context);        SQLiteDatabase db = qqHelper.getWritableDatabase();        String sql = "select * from user where account=? and password=?";        Cursor cursor = db.rawQuery(sql,new String[]{account,password});        int f = 0;        if(cursor.getCount() != 0) f = 1;        db.close();        cursor.close();        return f;    }    //通过注册号码查询账号与密码    public static Map queryUp(Context context, String num) {        QQHelper qqHelper = new QQHelper(context);        SQLiteDatabase db = qqHelper.getWritableDatabase();        String sql = "select * from user where num=?";        Cursor cursor = db.rawQuery(sql,new String[]{num});        Map map = new HashMap<>();        if(cursor.moveToNext()) {            @SuppressLint("Range") String account = cursor.getString(cursor.getColumnIndex("account"));            @SuppressLint("Range") String password = cursor.getString(cursor.getColumnIndex("password"));            map.put("account",account);            map.put("password",password);        }        cursor.close();        db.close();        return map;    }}

SaveQQ.java保存QQ账号与密码：

package com.example.datastorage;import android.content.Context;import android.content.SharedPreferences;import java.util.HashMap;import java.util.Map;public class SaveQQ {    public static void SaveUserInfo(Context context, String account, String password) {        SharedPreferences sharedPreferences = context.getSharedPreferences("QQuser",Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sharedPreferences.edit();        editor.putString("account",account);        editor.putString("password",password);        editor.apply();    }    public static Map getUserInfo(Context context) {        SharedPreferences sharedPreferences = context.getSharedPreferences("QQuser",Context.MODE_PRIVATE);        String account = sharedPreferences.getString("account",null);        String password = sharedPreferences.getString("password",null);        Map map = new HashMap<>();        map.put("account",account);        map.put("password",password);        return map;    }}

五、登录成功界面

activity_zhujian.xml 代码：

zhujianActivity.java 代码：

package com.example.datastorage;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;public class zhujianActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_zhujian);    }}

六、 styles.xml 和AndroidManifest.xml

在创建Activity之后，需要对创建的Activity进行配置，在AndroidManifest.xml中可以看到Activity的配置，其中exported根据需要设置，启动模式可以选择默认，stles.xml里面设置的是竖线。（AndroidManifest.xml 中有不是登录注册的Activity配置，不要混淆）

styles.xml 代码：

AndroidManifest.xml 代码：

来源地址：https://blog.csdn.net/qq_51936803/article/details/130072031