Android 简单登录注册

java代码>>
    LoginActivity.java
    MainActivity.java
    RegistActivity.java
layout布局>>
    activity_login.xml
    activity_main.xml
    activity_regist.xml

package com.example.user.registlogintest;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {
    private SharedPreferences pref;
    private SharedPreferences.Editor editor;

    private CheckBox rememberpass;
    private EditText nameEt;
    private EditText pwdEt;
    private Button login_btn;
    private Button regist_btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        pref = getSharedPreferences("data", 0);
        rememberpass = (CheckBox) findViewById(R.id.remember);
        nameEt = (EditText) findViewById(R.id.account);
        pwdEt = (EditText) findViewById(R.id.pwd);
        login_btn = (Button) findViewById(R.id.login);
        regist_btn = (Button) findViewById(R.id.regist);

        boolean isRemember = pref.getBoolean("remember_pass", false);
        if (isRemember) {
            //取不到的话返回空串
            String account = pref.getString("account", "");
            String password = pref.getString("password", "");
            //二次登录的时候，第一次的登录信息已经显示。
            nameEt.setText(account);
            pwdEt.setText(password);
            rememberpass.setChecked(true);
        }

        regist_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(LoginActivity.this, RegistActivity.class);
                startActivity(intent);
                finish();
            }
        });

        login_btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                String name = nameEt.getText().toString();
                String pwd = pwdEt.getText().toString();
                SharedPreferences pref = getSharedPreferences("data", MODE_PRIVATE);
                String nameSP = pref.getString("name", "");
                String password = pref.getString("password", "");
                editor = pref.edit();
                if (name.equals(nameSP) && pwd.equals(password)) {
                    if (rememberpass.isChecked()) {//选中了复选框
                        //先存数据到SP
                        editor.putString("account", name);
                        editor.putString("password", pwd);
                        editor.putBoolean("remember_pass", true);
                    } else {
                        //清空editor
                        editor.putBoolean("remember_pass", false);
                    }
                    //提交数据
                    editor.commit();
                    //跳到主活动
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                } else {
                    Toast.makeText(LoginActivity.this, "您的登录名或密码有误！！", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }


}

package com.example.user.registlogintest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
}

package com.example.user.registlogintest;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

public class RegistActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText name;
    private EditText password;
    private RadioButton sex1;
    private RadioButton sex2;
    private CheckBox hobby1;
    private CheckBox hobby2;
    private CheckBox hobby3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_regist);
        name = (EditText) findViewById(R.id.ed_name);
        password = (EditText) findViewById(R.id.et_pwd);
        sex1 = (RadioButton) findViewById(R.id.ed_sex1);
        sex2 = (RadioButton) findViewById(R.id.ed_sex2);
        hobby1 = (CheckBox) findViewById(R.id.ed_hobby1);

        hobby2 = (CheckBox) findViewById(R.id.ed_hobby2);

        hobby3 = (CheckBox) findViewById(R.id.ed_hobby2);
        Button button = (Button) findViewById(R.id.btn_submit);
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_submit:
                String result = "";
                String nameStr = name.getText().toString();
                String pwdStr = password.getText().toString();
                String radioStr1 = sex1.isChecked() ? "男" : "";
                String radioStr2 = sex2.isChecked() ? "女" : "";
                String hobby1Str = hobby1.getText().toString();
                String hobby2Str = hobby2.getText().toString();
                String hobby3Str = hobby3.getText().toString();
                if (!nameStr.isEmpty()) result += nameStr;
                if (!pwdStr.isEmpty()) result += pwdStr;
                if (!radioStr1.isEmpty()) result += radioStr1;
                if (!radioStr2.isEmpty()) result += radioStr2;
                if (!hobby1Str.isEmpty()) result += hobby1Str;
                if (!hobby2Str.isEmpty()) result += hobby2Str;
                if (!hobby3Str.isEmpty()) result += hobby3Str;
                Toast.makeText(RegistActivity.this, result, Toast.LENGTH_LONG).show();
                SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
                editor.putString("name", nameStr);
                editor.putString("password", pwdStr);
                editor.putString("sex", sex1.isChecked() ? "男" : "女");
                editor.apply();
                Toast.makeText(this, "注册成功！！", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(this, LoginActivity.class);
                startActivity(intent);
                finish();

                break;

        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_login"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical"
    tools:context="com.example.user.registlogintest.MainActivity">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="60dp">
    <TextView
        android:layout_width="90dp"
        android:layout_height="wrap_content"
        android:text="登录名："
        android:layout_gravity="center_vertical"
        android:textSize="18sp"
        />
    <EditText
        android:id="@+id/account"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_gravity="center_vertical"
        android:hint="在此处输入用户姓名"
        android:layout_height="wrap_content" />
 </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp">
        <TextView
            android:layout_width="90dp"
            android:layout_height="wrap_content"
            android:text="密   码："
            android:layout_gravity="center_vertical"
            android:textSize="18sp"
            />
        <EditText
            android:id="@+id/pwd"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_gravity="center_vertical"
            android:hint="在此处输入用户密码"
            android:inputType="textPassword"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <CheckBox
            android:id="@+id/remember"
            android:layout_width="wrap_content"
            android:layout_height="match_parent" />
        <TextView
            android:textSize="18sp"
            android:text="记住登录账号和密码"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#000"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="登录"
            />

        <Button
            android:id="@+id/regist"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="注册" />
    </LinearLayout>



</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_regist"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.user.registlogintest.MainActivity">

    <TextView
        android:id="@+id/tv_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:text="用户注册页面"
        android:textSize="20dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp">

        <TextView
            android:id="@+id/tv_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="姓名" />

        <EditText
            android:id="@+id/ed_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:background="@color/background_color"
            android:hint="请输入姓名"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp">

        <TextView
            android:id="@+id/tv_pwd"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="密码" />

        <EditText
            android:id="@+id/et_pwd"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="5"
            android:background="@color/background_color"
            android:hint="请输入密码"
            android:inputType="textPassword" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp">

        <TextView
            android:id="@+id/tv_sex"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="性别" />

        <RadioGroup
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/ed_sex1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="男" />

            <RadioButton
                android:id="@+id/ed_sex2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="女" />
        </RadioGroup>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="5dp">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="爱好" />

        <CheckBox
            android:id="@+id/ed_hobby1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="吃饭" />

        <CheckBox
            android:id="@+id/ed_hobby2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="吃饭" />

        <CheckBox
            android:id="@+id/ed_hobby3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="吃饭" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/btn_submit"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="提交" />

        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="取消" />
    </LinearLayout>

</LinearLayout>