Android笔记（四十四） Android中的数据存储——SQLite（六）整合

         实现注册、登录、注销账户

MainActivity.java

package cn.lixyz.activity;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import cn.lixyz.data.MySQLiteOpenHelper;
import cn.lixyz.sqlite.R;

public class MainActivity extends Activity {

    // 声明组件
    private EditText et_login_username, et_login_password;
    private Button bt_login_login, bt_login_register;
    private CheckBox cb_login_rember;
    private TextView tv_login_forget;

    // 声明一个意图
    private Intent intent;

    // 声明SQLite相关内容
    private MySQLiteOpenHelper msop;
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 找到组件
        findView();

        // 创建数据库
        msop = new MySQLiteOpenHelper(this, "user.db", null, 1);

        // 创建或打开一个数据库有两种方法，getWritableDatabase()和getReadableDatabase()，二者的区别是：
        // getWritableDatabase取得的实例是以读写的方式打开数据库，如果打开的数据库磁盘满了，此时只能读不能写，此时调用了getWritableDatabase的实例，那么将会发生错误（异常）
        // getReadableDatabase取得的实例是先调用getWritableDatabase以读写的方式打开数据库，如果数据库的磁盘满了，此时返回打开失败，继而用getReadableDatabase的实例以只读的方式去打开数据库
        database = msop.getReadableDatabase();

    }

    // 将findViewById独立封装，以清晰代码结构
    private void findView() {
        et_login_username = (EditText) findViewById(R.id.et_login_username);
        et_login_password = (EditText) findViewById(R.id.et_login_password);
        bt_login_login = (Button) findViewById(R.id.bt_login_login);
        bt_login_register = (Button) findViewById(R.id.bt_login_register);
        cb_login_rember = (CheckBox) findViewById(R.id.cb_login_rember);
        tv_login_forget = (TextView) findViewById(R.id.tv_login_forget);
    }

    // 通过ID来判断点击的是哪个按钮
    public void clickButton(View view) {
        switch (view.getId()) {
        case R.id.bt_login_login:
            login();
            break;

        case R.id.bt_login_register:
            register();
            break;
        case R.id.tv_login_forget:
            forgetPassword();
            break;
        }
    }

    // 登录方法
    private void login() {
        String username = et_login_username.getText().toString().trim();
        String password = et_login_password.getText().toString().trim();
        Cursor c = database.rawQuery("select * from user where username=? and password=?",
                new String[] { username, password });
        if (c.moveToFirst()) {
            intent = new Intent(MainActivity.this, IndexActivity.class);
            startActivity(intent);
            finish();
        } else {
            Toast.makeText(MainActivity.this, "登录不成功，检查您的账户和密码", Toast.LENGTH_SHORT).show();
        }
        c.close();
    }

    // 注册方法
    private void register() {
        intent = new Intent(MainActivity.this, RegesiterActivity.class);
        startActivity(intent);
    }

    // 找回密码方法
    private void forgetPassword() {
        intent = new Intent(MainActivity.this, ForgetPasswordActivity.class);
        startActivity(intent);
    }
}

activity_main.xml

<!-- 首页布局 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <!-- 一个ImageView控件放置logo -->

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="15dp"
        android:src="@drawable/logo" />

    <!-- 两个EditText，输入用户名和密码 -->

    <EditText
        android:id="@+id/et_login_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的用户名" />

    <EditText
        android:id="@+id/et_login_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的密码"
        android:password="true" />

    <!-- 一个水平的线性布局，用来放置登录和注册按钮 -->

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_login_login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="clickButton"
            android:text="登录" />

        <Button
            android:id="@+id/bt_login_register"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="clickButton"
            android:text="注册" />
    </LinearLayout>

    <!-- 一个水平的线性布局，用来放置记住用户名和忘记密码 -->

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

        <CheckBox
            android:id="@+id/cb_login_rember"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="记住用户名" />

        <!-- 将weight设置为1，全占剩余空间，以保障忘记密码水平居右 -->

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <TextView
            android:id="@+id/tv_login_forget"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:onClick="clickButton"
            android:text="忘记密码       " />
    </LinearLayout>

</LinearLayout>

RegesiterActivity.java

package cn.lixyz.activity;

import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import cn.lixyz.data.MySQLiteOpenHelper;
import cn.lixyz.sqlite.R;

public class RegesiterActivity extends Activity {

    // 声明组件
    private EditText et_reg_username, et_reg_password, et_reg_againPassword, et_reg_mobilephone;
    private Button bt_reg_submit;

    // 声明要插入的数据变量
    private String username, password, mobilephone;

    // 声明数据库组件
    private MySQLiteOpenHelper msoh;
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        findView();

        msoh = new MySQLiteOpenHelper(RegesiterActivity.this, "user.db", null, 1);
        database = msoh.getReadableDatabase();

        bt_reg_submit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String str = et_reg_againPassword.getText().toString().trim();
                String str2 = et_reg_password.getText().toString().trim();
                // 判断密码是否输入一致，如果不一致，弹出提示，并清空输入的密码
                if (str.equals(str2)) {
                    password = str;
                } else {
                    Toast.makeText(RegesiterActivity.this, "您输入的密码不一致,请重新输入", Toast.LENGTH_SHORT).show();
                    et_reg_password.setText("");
                    et_reg_againPassword.setText("");
                    return;
                }
                username = et_reg_username.getText().toString().trim();
                mobilephone = et_reg_mobilephone.getText().toString().trim();

                // 打包插入数据
                ContentValues cv = new ContentValues();
                cv.put("username", username);
                cv.put("password", password);
                cv.put("mobilephone", mobilephone);
                if (database.insert("user", null, cv) > 0) {
                    Toast.makeText(RegesiterActivity.this, "注册成功", Toast.LENGTH_SHORT).show();
                    finish();
                } else {
                    Toast.makeText(RegesiterActivity.this, "注册不成功", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    //// 将findViewById独立封装，以清晰代码结构
    private void findView() {
        et_reg_username = (EditText) findViewById(R.id.et_reg_username);
        et_reg_password = (EditText) findViewById(R.id.et_reg_password);
        et_reg_againPassword = (EditText) findViewById(R.id.et_reg_againPassword);
        et_reg_mobilephone = (EditText) findViewById(R.id.et_reg_mobilephone);
        bt_reg_submit = (Button) findViewById(R.id.bt_reg_submit);
    }

}

activity_register.xml

<!-- 注册布局 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <!-- 注册用户名 -->

    <EditText
        android:id="@+id/et_reg_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您要注册的用户名" />
    <!-- 注册密码 -->

    <EditText
        android:id="@+id/et_reg_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您要注册的密码"
        android:password="true" />
    <!-- 重复注册密码 -->

    <EditText
        android:id="@+id/et_reg_againPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="再次输入密码"
        android:password="true" />
    <!-- 注册手机号 -->

    <EditText
        android:id="@+id/et_reg_mobilephone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的手机号" />
    <!-- 提交注册按钮 -->

    <Button
        android:id="@+id/bt_reg_submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="提     交" />

</LinearLayout>

IndexActivity.java

package cn.lixyz.activity;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import cn.lixyz.data.MySQLiteOpenHelper;
import cn.lixyz.sqlite.R;

public class IndexActivity extends Activity {

    private EditText et_del_mobile;
    private Button bt_del_submit;

    private MySQLiteOpenHelper msop;
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_index);

        findView();

        msop = new MySQLiteOpenHelper(IndexActivity.this, "user.db", null, 1);
        database = msop.getReadableDatabase();

        bt_del_submit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String mobile = et_del_mobile.getText().toString().trim();
                Cursor c = database.rawQuery("select mobilephone from user where mobilephone=?",
                        new String[] { mobile });
                if (c.moveToFirst()) {
                    int i = database.delete("user", "mobilephone=?", new String[] { mobile });
                    if (i > 0) {
                        Toast.makeText(IndexActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
                        finish();
                    } else {
                        Toast.makeText(IndexActivity.this, "*删除不成功*", Toast.LENGTH_SHORT).show();
                    }
                } else {
                    Toast.makeText(IndexActivity.this, "删除不成功", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void findView() {
        et_del_mobile = (EditText) findViewById(R.id.et_del_mobile);
        bt_del_submit = (Button) findViewById(R.id.bt_del_submit);
    }

}

activity_index.xml

<?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:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="注销账户" />

    <EditText
        android:id="@+id/et_del_mobile"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="验证您的手机号" />

    <Button
        android:id="@+id/bt_del_submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点我验证，删除账户" />

</LinearLayout>

ForgetPasswordActivity.java

package cn.lixyz.activity;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import cn.lixyz.data.MySQLiteOpenHelper;
import cn.lixyz.sqlite.R;

public class ForgetPasswordActivity extends Activity {

    private EditText et_forget_mobile, et_forget_username, et_forget_password, et_forget_againPassword;
    private Button bt_forget_submit;

    private MySQLiteOpenHelper msop;
    private SQLiteDatabase database;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_forget);

        findView();

        msop = new MySQLiteOpenHelper(this, "user.db", null, 1);
        database = msop.getReadableDatabase();

        bt_forget_submit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String username = et_forget_username.getText().toString().trim();
                String mobile = et_forget_mobile.getText().toString().trim();

                Cursor c = database.rawQuery("select username,mobilephone from user where username=? and mobilephone=?",
                        new String[] { username, mobile });
                if (c.moveToFirst()) {
                    String str = et_forget_password.getText().toString().trim();
                    String str2 = et_forget_againPassword.getText().toString().trim();
                    if (str.equals(str2)) {
                        ContentValues cv = new ContentValues();
                        cv.put("password", str);
                        database.update("user", cv, "username=? and mobilephone=?", new String[] { username, mobile });
                        Toast.makeText(ForgetPasswordActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
                        finish();
                    }
                }
            }
        });
    }

    private void findView() {
        et_forget_mobile = (EditText) findViewById(R.id.et_forget_mobile);
        et_forget_username = (EditText) findViewById(R.id.et_forget_username);
        et_forget_password = (EditText) findViewById(R.id.et_forget_password);
        et_forget_againPassword = (EditText) findViewById(R.id.et_forget_againPassword);
        bt_forget_submit = (Button) findViewById(R.id.bt_forget_submit);
    }
}

activity_forget.xml

<?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:orientation="vertical" >

    <EditText
        android:id="@+id/et_forget_mobile"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的手机号" />

    <EditText
        android:id="@+id/et_forget_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的用户名" />

    <EditText
        android:id="@+id/et_forget_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="输入您的密码" />

    <EditText
        android:id="@+id/et_forget_againPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:hint="重复输入您的密码" />

    <Button
        android:id="@+id/bt_forget_submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="修改" />

</LinearLayout>

 AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.lixyz.sqlite"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="cn.lixyz.activity.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="cn.lixyz.activity.RegesiterActivity" />
        <activity android:name="cn.lixyz.activity.IndexActivity" />
        <activity android:name="cn.lixyz.activity.ForgetPasswordActivity" />
    </application>

</manifest>