基于SQLite的安卓平台用户信息管理系统

基于SQLite的安卓平台用户信息管理系统编程实例，开源一下

源代码

MainActivity.java

package com.example.administrator.sqlite;

import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button btn = null;
    Button btn_yinshi = null;

    private static final String DB_NAME = "dbUser.db";//定义DB_NAME
    private SQLiteDatabase db;//SQLiteDatabase对象db

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

        //注册
        btn = ((Button) findViewById(R.id.btn));
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),UserRegs.class);
                startActivity(intent);

            }
        });

        //登入
        btn_yinshi = ((Button) findViewById(R.id.btn_yinshi));
        btn_yinshi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),UserLogin.class);
                startActivity(intent);

            }
        });


    }
}

activity_main.xml

package com.example.administrator.sqlite;

import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button btn = null;
    Button btn_yinshi = null;

    private static final String DB_NAME = "dbUser.db";//定义DB_NAME
    private SQLiteDatabase db;//SQLiteDatabase对象db

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

        //注册
        btn = ((Button) findViewById(R.id.btn));
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),UserRegs.class);
                startActivity(intent);

            }
        });

        //登入
        btn_yinshi = ((Button) findViewById(R.id.btn_yinshi));
        btn_yinshi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),UserLogin.class);
                startActivity(intent);

            }
        });


    }
}

UserLogin.java

package com.example.administrator.sqlite;

import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class UserLogin extends AppCompatActivity {

    private static final String DB_NAME = "dbUser.db";
    private SQLiteDatabase db;

    private EditText etUserName=null;
    private EditText etPwd=null;
    private Button btnLogin=null;
    private Button btnReg=null;
    private TextView tvShowInfo=null;

    private String strUserName="";
    private String strPwd="";
    private int iUT=-1;

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

        etUserName=(EditText)findViewById(R.id.etULUserName);
        etPwd=(EditText)findViewById(R.id.etULPwd);
        btnLogin=(Button)findViewById(R.id.btnULLogin);
        btnReg=(Button)findViewById(R.id.btnULReg);
        tvShowInfo=(TextView)findViewById(R.id.tvULShowInfo);

        OpenCreateDB();

        Button.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(v.getId() == R.id.btnULLogin)
                {

                    strUserName=etUserName.getText().toString();
                    strPwd=etPwd.getText().toString();

                    if(isStrEmpty(strUserName) == false)
                    {

                        if(isStrEmpty(strPwd) == false)
                        {

                            if(isValidUser(strUserName,strPwd) == true)
                            {
                                //Toast.makeText(UserLogin.this, "用户登录成功！", Toast.LENGTH_SHORT).show();
                                //Toast.makeText(UserLogin.this, "用户登录失败！", Toast.LENGTH_SHORT).show();

                                Intent intent = new Intent(getApplicationContext(),Welcome.class);
                                intent.putExtra("name",strUserName);

                                startActivity(intent);
                                //showUserType(strUserName,strPwd);

                            }
                            else
                            {
                                Toast.makeText(UserLogin.this, "用户登录失败！", Toast.LENGTH_SHORT).show();
                                tvShowInfo.setText("用户登录失败");
                            }

                        }
                        else
                        {
                            Toast.makeText(UserLogin.this, "密码不可为空！", Toast.LENGTH_SHORT).show();
                            tvShowInfo.setText("密码不可为空");
                            etPwd.setFocusable(true);
                        }

                    }
                    else
                    {
                        Toast.makeText(UserLogin.this, "用户名不可为空！", Toast.LENGTH_SHORT).show();
                        tvShowInfo.setText("用户名不可为空");
                        etUserName.setFocusable(true);
                    }

                }
                else if(v.getId() == R.id.btnULReg)
                {
                    Intent intent = new Intent();
                    intent.setClass(UserLogin.this,UserRegs.class);
                    startActivity(intent);

                }


            }
        };

        btnLogin.setOnClickListener(listener);
        btnReg.setOnClickListener(listener);

    }

    private void showUserType(String strUserName,String strUserPwd) {

        iUT = getUserType(strUserName,strUserPwd);

        if(iUT == 1)
        {
            Toast.makeText(UserLogin.this, "您是系统管理员！", Toast.LENGTH_SHORT).show();
        }
        else if(iUT == 0)
        {
            Toast.makeText(UserLogin.this, "您是普通用户！", Toast.LENGTH_SHORT).show();
        }
        else
        {
            Toast.makeText(UserLogin.this, "出错啦！", Toast.LENGTH_SHORT).show();
        }

    }

    private int getUserType(String strUserName, String strUserPwd) {

        int igut = -1;

        Cursor cursor = db.rawQuery("select * from tuserinfo where username='"+strUserName+"' and userpwd='"+strUserPwd+"'",null);

        if(cursor.getCount() == 1)
        {
            igut = cursor.getInt(cursor.getColumnIndex("usertype"));
            cursor.close();
        }
        else
        {
            cursor.close();
            igut = 99;
        }

        return igut;

    }

    private void OpenCreateDB() {

        try
        {
            db = openOrCreateDatabase(DB_NAME, this.MODE_PRIVATE, null);
        }
        catch (Throwable e)
        {
            Log.e("tag","openDatabase error:" + e.getMessage());
            db=null;
        }
        try
        {
            db.execSQL("CREATE TABLE IF NOT EXISTS tuserinfo (_id INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR, userpwd VARCHAR, usertype INTEGER)");
        }
        catch (SQLException se)
        {
            String msg = "doInstall.error:[%s].%s";
            Log.d("tag",String.format(msg, se.getClass(),se.getMessage()));
        }
    }

    private boolean isStrEmpty(String strInput)
    {

        if(strInput.equals(""))
        {

            return true;
        }
        else
        {

            return false;
        }
    }

    private boolean isValidUser(String strUserName,String strUserPwd)
    {

        Cursor cursor=db.rawQuery("select * from tuserinfo where username='"+strUserName+"' and userpwd='"+strUserPwd+"'",null);


        if(cursor.getCount()== 1)
        {
            cursor.close();
            return true;
        }
        else
        {

            cursor.close();
            return false;
        }
    }

    protected void onDestroy()
    {
        super.onDestroy();
        if(db!=null)
        {
            db.close();
        }
    }


}

activity_user_login.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.sqlite.UserLogin">

    <LinearLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:orientation="vertical"
        tools:layout_editor_absoluteY="8dp"
        tools:layout_editor_absoluteX="8dp">

        <TextView
            android:id="@+id/tvULTitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="欢迎登录"/>

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

            <TextView
                android:id="@+id/tvULUserName"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="用户名：" />

            <EditText
                android:id="@+id/etULUserName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:hint="请输入用户名"
                android:inputType="textPersonName" >

                <requestFocus />
            </EditText>
        </LinearLayout>

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

            <TextView
                android:id="@+id/tvULPwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="密码：" />

            <EditText
                android:id="@+id/etULPwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:hint="请输入密码"
                android:inputType="textPassword" />

        </LinearLayout>

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

            <Button
                android:id="@+id/btnULLogin"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="登录" />

            <Button
                android:id="@+id/btnULReg"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="新用户" />

        </LinearLayout>
        <TextView
            android:id="@+id/tvULShowInfo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="信息提示区" />

    </LinearLayout>

</FrameLayout>

UserRegs.java

package com.example.administrator.sqlite;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class UserRegs extends AppCompatActivity {

    private static final String DB_NAME="dbUser.db";
    private SQLiteDatabase db;

    private Button btnOk=null;
    private Button btnCancel=null;
    private EditText etUserName=null;
    private EditText etPwd=null;
    private EditText etRePwd=null;
    private TextView tvShowInfo=null;

    private String strUserName="";
    private String strPwd="";
    private String strRePwd="";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_regs2);

        etUserName=(EditText)findViewById(R.id.etURUserName);
        etPwd=(EditText)findViewById(R.id.etURPwd);
        etRePwd=(EditText)findViewById(R.id.etURRePwd);

        btnOk=(Button)findViewById(R.id.btnOk);
        btnCancel=(Button)findViewById(R.id.btnCancel);

        OpenCreateDB();

        Button.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if(v.getId() == R.id.btnOk)
                {

                    //获取编辑框的数据
                    strUserName=etUserName.getText().toString();
                    strPwd=etPwd.getText().toString();
                    strRePwd=etRePwd.getText().toString();

                    if(isStrEmpty(strUserName) == false)
                    {
                        if(isStrEmpty(strPwd) == false)
                        {
                            if(isStrEmpty(strRePwd) == false)
                            {
                                if(isPwdSame(strPwd,strRePwd) == true)
                                {
                                    insertUserInfo(strUserName,strPwd);
                                }
                                else
                                {
                                    tvShowInfo.setText("密码和确认密码不一致");
                                }

                            }
                            else
                            {
                                tvShowInfo.setText("确认密码不可为空");
                                etRePwd.setFocusable(true);
                            }

                        }
                        else
                        {
                            tvShowInfo.setText("密码不可为空");
                            etPwd.setFocusable(true);
                        }

                    }
                    else
                    {
                        tvShowInfo.setText("用户名不可为空");
                        etUserName.setFocusable(true);
                    }

                }
                else if(v.getId() == R.id.btnCancel)
                {
                    etUserName.setText("");
                    etPwd.setText("");
                    etRePwd.setText("");
                    etUserName.setFocusable(true);
                    tvShowInfo.setText("");
                }




            }
        };

        btnOk.setOnClickListener(listener);
        btnCancel.setOnClickListener(listener);

    }

    private boolean isExistAdmin()
    {
        //将usertype=1的管理员用户查找出来
        Cursor cursor=db.rawQuery("select * from tuserinfo where usertype=1",null);

        if(cursor.getCount()> 0)//存在管理员用户
        {
            cursor.close();
            return true;
        }
        else//不存在管理员用户
        {
            cursor.close();
            return false;
        }
    }

    private void insertAdminInfo()
    {
        String strUserName= "[email protected]";

        String strUserPwd="1";

        int iUserType=1;

        if(isExistAdmin()==false)//若表中目前还没有管理员用户
        {

            ContentValues cvUserInfo = new ContentValues();

            cvUserInfo.put("username", strUserName);

            cvUserInfo.put("userpwd", strUserPwd);

            cvUserInfo.put("usertype", iUserType);
            if(db!=null)
            {
                db.insert("tuserinfo", null, cvUserInfo);

                Log.d("msg","插入结束");
                Toast.makeText(UserRegs.this, "注册成功！", Toast.LENGTH_SHORT).show();
                tvShowInfo.setText("用户名："+strUserName+"\n"+"密码："+strUserPwd+"\n"+"类别："+iUserType);
            }
        }
        else
        {
            tvShowInfo.setText("已存在系统管理员\n用户名："+strUserName+"\n"+"密码："+strUserPwd+"\n");
        }

    }

    private void insertUserInfo(String strUserName,String strUserPwd) {

        int iUserType=0;

        if(isExistUserName(strUserName) == false)
        {
            ContentValues contentvalues = new ContentValues();
            contentvalues.put("username", strUserName);
            contentvalues.put("userpwd", strUserPwd);
            contentvalues.put("usertype", iUserType);

            if(db != null)
            {
                db.insert("tuserinfo",null,contentvalues);
                Toast.makeText(UserRegs.this, "注册成功！", Toast.LENGTH_SHORT).show();
                tvShowInfo.setText("已经成功注册普通\n用户名："+strUserName+"\n"+"密码："+strUserPwd+"\n");
            }

        }
        else
        {
            Toast.makeText(UserRegs.this, "您要注册的用户名已经存在！", Toast.LENGTH_SHORT).show();
        }
    }

    private boolean isExistUserName(String strUserName) {

        Cursor cursor = db.rawQuery("select * from tuserinfo where username='"+strUserName+"'",null);

        if(cursor.getCount() > 0)
        {
            cursor.close();
            return true;
        }
        else
        {
            cursor.close();
            return false;
        }

    }

    private boolean isPwdSame(String strUserPwd,String strUserRePwd) {

        if(strUserPwd.equals(strUserRePwd))
        {
            return true;
        }
        else
        {
            return false;
        }

    }

    private boolean isStrEmpty(String strInput) {

        if(strInput.equals(""))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    private void OpenCreateDB() {

        try
        {
            db = openOrCreateDatabase(DB_NAME,this.MODE_PRIVATE,null);
        }
        catch (Throwable e)
        {
            Log.e("tag","openDatabase error:" + e.getMessage());
            db = null;
        }

        try
        {
            db.execSQL("CREATE TABLE IF NOT EXISTS tuserinfo (_id INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR, userpwd VARCHAR, usertype INTEGER)");

        }
        catch (SQLException se)
        {
            String msg = "doInstall.error:[%s].%s";
            Log.d("tag",String.format(msg, se.getClass(),se.getMessage()));
        }

    }

    protected void onDestroy()
    {
        super.onDestroy();
        if(db!=null)
        {
            db.close();
        }
    }

}

activity_user_regs2.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.sqlite.UserRegs"
    tools:ignore="MergeRootFrame">

    <LinearLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:orientation="vertical"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp">


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

            <TextView
                android:id="@+id/tvURTitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="欢迎注册" />


        </LinearLayout>


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

            <TextView
                android:id="@+id/tvURUsername"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="用户名:" />

            <EditText
                android:id="@+id/etURUserName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:hint="请输入用户名" />

        </LinearLayout>


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

            <TextView
                android:id="@+id/tvURPwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="密码:" />

            <EditText
                android:id="@+id/etURPwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="请输入密码"
                android:inputType="textPassword" />

        </LinearLayout>

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

            <TextView
                android:id="@+id/tvURRePwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="密码确认：" />

            <EditText
                android:id="@+id/etURRePwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:hint="请确认密码"
                android:inputType="textPassword" />
        </LinearLayout>


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

            <Button
                android:id="@+id/btnOk"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="确定" />

            <Button
                android:id="@+id/btnCancel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="取消" />


        </LinearLayout>

    </LinearLayout>


</FrameLayout>

ViewHolder.java

package com.example.administrator.sqlite;

import android.app.Application;
import android.widget.CheckBox;
import android.widget.TextView;

/**
 * Created by Administrator on 2017-11-13.
 */

public class ViewHolder {

    public TextView tv = null;

    public CheckBox cb = null;

}

Welcome.java

package com.example.administrator.sqlite;

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

public class Welcome extends AppCompatActivity {

    Button btn_pwd = null;
    Button btn_Manage = null;

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

        final String name = getIntent().getStringExtra("name");
        Toast.makeText(Welcome.this, name+" , 欢迎登录！", Toast.LENGTH_SHORT).show();

        btn_pwd = ((Button) findViewById(R.id.btn_pwdChange));

        btn_pwd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),Change.class);
                intent.putExtra("name",name);
                startActivity(intent);


            }
        });

        btn_Manage = ((Button) findViewById(R.id.btn_Manage));

        btn_Manage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getApplicationContext(),UserManage.class);

                startActivity(intent);

            }
        });

    }
}

activity_welcome.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.sqlite.Welcome">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:text="Welcome"
        android:textSize="30dp"
        android:textStyle="italic"
        android:gravity="center"
        tools:layout_editor_absoluteX="8dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="8dp"
        app:layout_constraintVertical_bias="0.244" />

    <Button
        android:id="@+id/btn_pwdChange"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="修改密码"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="8dp"
        android:layout_marginRight="8dp"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent" />

    <Button
        android:id="@+id/btn_Manage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查看用户"
        android:layout_marginRight="8dp"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="8dp"
        app:layout_constraintVertical_bias="0.709" />
</android.support.constraint.ConstraintLayout>

Change.java

package com.example.administrator.sqlite;

import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class Change extends AppCompatActivity {

    private static final String DB_NAME="dbUser.db";
    private SQLiteDatabase db=null;

    private Button btnOk=null;
    private Button btnCancel=null;
    private TextView tvUserName=null;
    private EditText etOldPwd=null;
    private EditText etNewPwd=null;
    private EditText etRePwd=null;
    private TextView tvShowInfo=null;

    private String strUserName="";
    private String strOldPwd="";
    private String strNewPwd="";
    private String strRePwd="";

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

        tvUserName=(TextView)findViewById(R.id.tvPCCurrentUN);
        etOldPwd=(EditText)findViewById(R.id.etPCOldPwd);
        etNewPwd=(EditText)findViewById(R.id.etPCNewPwd);
        etRePwd=(EditText)findViewById(R.id.etPCRePwd);
        tvShowInfo=(TextView)findViewById(R.id.tvPCShowInfo);
        btnOk=(Button)findViewById(R.id.btnPCOK);
        btnCancel=(Button)findViewById(R.id.btnPCCancel);


        strUserName = getIntent().getStringExtra("name");
        tvUserName.setText(strUserName);
        tvUserName.setEnabled(false);

        OpenCreateDB();

        Button.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                if(v.getId() == R.id.btnPCOK)
                {
                    strOldPwd=etOldPwd.getText().toString();
                    strNewPwd=etNewPwd.getText().toString();
                    strRePwd=etRePwd.getText().toString();

                    if(isStrEmpty(strOldPwd) == false)
                    {

                        if(isStrEmpty(strNewPwd) == false)
                        {

                            if(isStrEmpty(strRePwd) == false)
                            {

                                if(isPwdSame(strNewPwd,strRePwd) == true)
                                {
                                    Toast.makeText(getApplicationContext(), "修改密码成功！", Toast.LENGTH_SHORT).show();
                                    //tvShowInfo.setText("修改密码成功");

                                    updatePwd(strUserName,strNewPwd);
                                }
                                else
                                {
                                    tvShowInfo.setText("新密码和确认密码不一致");
                                    etRePwd.setFocusable(true);
                                }

                            }
                            else
                            {
                                tvShowInfo.setText("请确认新密码");
                                etRePwd.setFocusable(true);
                            }

                        }
                        else
                        {
                            tvShowInfo.setText("请输入新密码");
                            etNewPwd.setFocusable(true);
                        }

                    }
                    else
                    {
                        tvShowInfo.setText("请输入原始密码");
                        etOldPwd.setFocusable(true);
                    }
                }
                else
                {
                    etOldPwd.setText("");
                    etRePwd.setText("");
                    etNewPwd.setText("");
                    etOldPwd.setFocusable(true);
                }


            }
        };

        btnOk.setOnClickListener(listener);
        btnCancel.setOnClickListener(listener);


    }

    private void OpenCreateDB()
    {
        try
        {
            db = openOrCreateDatabase(DB_NAME, this.MODE_PRIVATE, null);
        }
        catch (Throwable e)
        {
            Log.e("tag","openDatabase error:" + e.getMessage());
            db=null;
        }
        try
        {
            db.execSQL("CREATE TABLE IF NOT EXISTS tuserinfo (_id INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR, userpwd VARCHAR, usertype INTEGER)");
        }
        catch (SQLException se)
        {
            String msg = "doInstall.error:[%s].%s";
            Log.d("tag",String.format(msg, se.getClass(),se.getMessage()));
        }
    }

    private boolean isStrEmpty(String strInput)
    {

        if(strInput.equals(""))
        {

            return true;
        }
        else
        {

            return false;
        }
    }

    private boolean isPwdSame(String strUserPwd,String strUserRePwd){

        if(strUserPwd.equals(strUserRePwd))
        {

            return true;
        }
        else
        {

            return false;
        }
    }

    private boolean updatePwd(String strUserName,String strNUserPwd)
    {

        String sql = "update [tuserinfo] set userpwd = '"+strNUserPwd+"' where username='"+strUserName+"'";
        try
        {
            db.execSQL(sql);
            return true;
        }
        catch (SQLException e)
        {
            return false;
        }
    }

    protected void onDestroy()
    {
        super.onDestroy();
        if(db!=null)
        {
            db.close();
        }
    }
}

activity_change.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.sqlite.Change">

    <LinearLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:orientation="vertical"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp">

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

            <TextView
                android:id="@+id/tvPCTitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="用户密码修改" />
        </LinearLayout>

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

            <TextView
                android:id="@+id/tvPCUserName"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="用户名：" />

            <TextView
                android:id="@+id/tvPCCurrentUN"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="无" />
        </LinearLayout>

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

            <TextView
                android:id="@+id/tvPCOldPwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="原密码：" />

            <EditText
                android:id="@+id/etPCOldPwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:inputType="textPassword">

                <requestFocus />
            </EditText>

        </LinearLayout>

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

            <TextView
                android:id="@+id/tvPCNewPwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="新密码：" />

            <EditText
                android:id="@+id/etPCNewPwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:inputType="textPassword" />

        </LinearLayout>

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

            <TextView
                android:id="@+id/tvPCRePwd"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="确认密码：" />

            <EditText
                android:id="@+id/etPCRePwd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:inputType="textPassword" />

        </LinearLayout>

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

            <Button
                android:id="@+id/btnPCOK"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="确定" />

            <Button
                android:id="@+id/btnPCCancel"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="取消" />


        </LinearLayout>

        <TextView
            android:id="@+id/tvPCShowInfo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="信息提示区" />


    </LinearLayout>

</android.support.constraint.ConstraintLayout>

UserManage.java

package com.example.administrator.sqlite;

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;

public class UserManage extends AppCompatActivity {


    private static final String DB_NAME = "dbUser.db";
    private SQLiteDatabase db = null;

    //定义ListView变量lvShowItem
    private ListView lvShowItem = null;

    private Button btnDelete = null;
    private Button btnExit = null;

    //提示信息
    private TextView tvShowInfo = null;

    private int UNLen = -1;
    private String strUserName[];

    private int iSelectedUser = 0;

    private static ArrayList<String> listStr = null;
    private static ArrayList<Integer> listInt = null;

    //data
    private static List<HashMap<String, Object>> list = null;

    private MyAdapter adapter = null;


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

        //找到ListView
        lvShowItem=(ListView)findViewById(R.id.lvUMShowItem);

        btnDelete=(Button)findViewById(R.id.btnUMDelete);
        btnExit=(Button)findViewById(R.id.btnUMExit);
        tvShowInfo=(TextView)findViewById(R.id.tvUMShowInfo);

        if( getAllNUser() == true)
        {
            showCheckBoxListView();
        }
        else
        {
            tvShowInfo.setText("未找到任何用户");
        }

        btnDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                for(int i = 0 ; i < listStr.size() ; i++)
                {
                    String strTUN = listStr.get(i).toString();

                    deleteSUN(strTUN);

                    int position = listInt.get(i).intValue();

                    list.remove(position);

                    adapter.syncListInt(i,listStr.size());

                    adapter.notifyDataSetChanged();

                    adapter.setCheckBoxValue(false);

                }

                tvShowInfo.setText("");

                Toast.makeText(UserManage.this, "共删除"+iSelectedUser+"个用户", Toast.LENGTH_SHORT).show();

                iSelectedUser = 0 ;

                listStr.removeAll(listStr);

                listInt.removeAll(listInt);
            }
        });


        btnExit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent();

                intent.setClass(UserManage.this,MainActivity.class);

                startActivity(intent);

            }
        });





    }

    private void deleteSUN(String strUserName)
    {

        db.execSQL("delete from tuserinfo where username='"+strUserName+"'");

    }

    public void showCheckBoxListView() {

        list = new ArrayList<HashMap<String, Object>>();

        //strUserName数组存放了getAllNUser获得的所有用户名
        for(int i = 0 ; i < strUserName.length ; i++)
        {
            //进入for循环后，每次产生一个item
            HashMap<String,Object> map = new HashMap<String, Object>();

            //讲一个用户名映射到"item_tv"上
            map.put("item_tv",strUserName[i]);

            //将false映射"item_cb"，这是默认情况
            map.put("item_cb",false);

            //加载信息至list中
            //将由一个用户名和一个布尔类型构成的map加入list中
            list.add(map);

            //调用MyAdapter的构造函数
            adapter = new MyAdapter(this,list,R.layout.aum_listviewitem,
                                    new String[]{"item_tv","item_cb"},new int[]{R.id.item_tv,R.id.item_cb});

            //把listview的对象lvShowItem和MyAdapter的对象adapter连起来
            //相当于完成了listview和适配器的绑定
            lvShowItem.setAdapter(adapter);

            listStr = new ArrayList<String>();
            listInt = new ArrayList<Integer>();

            //监听listview中的点击事件
            lvShowItem.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    //使用getTag方法获得带holder标志的数据
                    com.example.administrator.sqlite.ViewHolder holder = ((com.example.administrator.sqlite.ViewHolder) view.getTag());

                    //在item每次被单击的时候改变CheckBox的状态
                    holder.cb.toggle();

                    //同时修改map里面的布尔类型变量的值，同步一下
                    adapter.isSelected.put(position,holder.cb.isChecked());

                    //如果CheckBox是被勾上的
                    if(holder.cb.isChecked() == true)
                    {
                        //在listStr中存放被选中的item的用户名
                        listStr.add(strUserName[position]);

                        //在listInt中存放被选中的item的位置
                        listInt.add(Integer.valueOf(position));
                    }
                    else//如果CheckBox是没有被勾上
                    {
                        //在listStr中除去被选中的item的用户名
                        listStr.remove(strUserName[position]);

                        //在listInt中除去被选中的item的位置
                        listInt.remove(Integer.valueOf(position));

                    }

                    //将listStr的用户数量存入iSelectedUser
                    iSelectedUser=listStr.size();

                    //在信息提示区提示一下有多少用户被选中了
                    tvShowInfo.setText("共选中"+iSelectedUser+"个用户");

                }
            });

        }


    }

    private void OpenCreateDB()
    {
        try
        {
            db = openOrCreateDatabase(DB_NAME, this.MODE_PRIVATE, null);
        }
        catch (Throwable e)
        {
            Log.e("tag","openDatabase error:" + e.getMessage());
            db=null;
        }
        try
        {
            db.execSQL("CREATE TABLE IF NOT EXISTS tuserinfo (_id INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR, userpwd VARCHAR, usertype INTEGER)");

        }
        catch (SQLException se)
        {
            String msg = "doInstall.error:[%s].%s";
            Log.d("tag",String.format(msg, se.getClass(),se.getMessage()));
        }
    }

    private boolean getAllNUser() {

        //打开数据库，获得db
        OpenCreateDB();

        //获得普通用户的数量
        Cursor cursor = db.rawQuery("select * from tuserinfo where usertype=0",null);
        UNLen = cursor.getCount();


        if(UNLen >= 0 )
        {
            //动态申请一个长度为UNLen的String数组strUserName
            strUserName = new String[UNLen];

            //iLen为strUserName数组的index
            int iLen = 0;

            if(cursor.moveToFirst())
            {
                //存入第一个用户的username
                strUserName[iLen] = cursor.getString(cursor.getColumnIndex("username"));
                iLen++;

                while (cursor.moveToNext() && (iLen <= UNLen))
                {
                    //存入接下来几个用户的username
                    strUserName[iLen] = cursor.getString(cursor.getColumnIndex("username"));
                    iLen++;
                }

                cursor.close();
                return  true;

            }
            else
            {
                return false;
            }

        }
        else
        {
            return false;
        }

    }

    protected void onDestroy()
    {
        super.onDestroy();
        if(db!=null)
        {
            db.close();
        }
    }


    public class MyAdapter extends BaseAdapter {

        //定义静态HashMap类型对象，用于记录Listview中的每一项的checkbox的值
        public  HashMap<Integer, Boolean> isSelected;

        private Context context;

        private LayoutInflater inflater;//用于xml布局文件的实例化

        private List<HashMap<String, Object>> listAdapter = null;

        private String KeyString[] = null;//每个item中textview和checkbox的值

        private String itemString = null;//每个item中的view值

        private int idValue[];

        public MyAdapter(Context context, List<HashMap<String, Object>> list,int resource ,String[] from, int[] to) {

            this.context = context;
            this.listAdapter = list;
            KeyString = new String[from.length];//from.length = 2
            idValue = new int[to.length];//to.length = 2

            System.arraycopy(from,0,KeyString,0,from.length);//{"item_tv","item_cb"}
            System.arraycopy(to,0,idValue,0,to.length);//{R.id.item_tv,R.id.item_cb}

            inflater = LayoutInflater.from(context);

            setCheckBoxValue(false);


        }

        private void setCheckBoxValue(boolean bCheck) {

            isSelected = new HashMap<Integer, Boolean>();

            for(int i = 0 ; i <listAdapter.size();i++)
            {
                isSelected.put(i,bCheck);
            }

        }


        @Override
        public int getCount() {
            return listAdapter.size();
        }

        @Override
        public Object getItem(int position) {
            return listAdapter.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent)
        {
            com.example.administrator.sqlite.ViewHolder holder = new com.example.administrator.sqlite.ViewHolder();

            if(convertView == null)
            {
                convertView = LayoutInflater.from(getApplication()).inflate(R.layout.aum_listviewitem,null);
            }

            holder.tv = ((TextView) convertView.findViewById(R.id.item_tv));

            //Toast.makeText(UserManage.this, holder.tv.getText().toString(), Toast.LENGTH_SHORT).show();

            holder.cb = ((CheckBox) convertView.findViewById(R.id.item_cb));

            convertView.setTag(holder);

            //就相当于User user = data.get(position);
            HashMap<String, Object> map = listAdapter.get(position);


            itemString = map.get(KeyString[0]).toString();//这地方调了一晚上，，，醉了

            holder.tv.setText(itemString);

            //Toast.makeText(UserManage.this, KeyString[0], Toast.LENGTH_SHORT).show();

            holder.cb.setChecked(isSelected.get(position));

            return convertView;

        }

        public void syncListInt(int start, int len)
        {

            for(int i = start + 1 ; i < len ; i++)
            {
                listInt.set(i,listInt.get(i)-1);
            }

        }


    }

}

activity_user_manage.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.sqlite.UserManage">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

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

            <TextView
                android:id="@+id/tvPCTitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="用户信息管理" />

        </LinearLayout>

        <ListView
            android:id="@+id/lvUMShowItem"
            android:layout_width="match_parent"
            android:layout_height="300dp">

        </ListView>

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

            <Button
                android:id="@+id/btnUMDelete"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="删除" />

            <Button
                android:id="@+id/btnUMExit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="退出" />
        </LinearLayout>

        <TextView
            android:id="@+id/tvUMShowInfo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="信息提示区" />


    </LinearLayout>


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


    </LinearLayout>


</FrameLayout>

aum_listviewitem.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="horizontal"
    android:layout_marginTop="30dip">

    <ImageView
        android:id="@+id/image_header"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/item_tv"
        android:layout_width="230dp"
        android:layout_height="60dp"
        android:textColor="#000000"
        android:textSize="23dp"
        android:gravity="center_vertical"
        android:layout_margin="2dp"
        android:layout_toRightOf="@+id/image_header"
        />

    <CheckBox
        android:id="@+id/item_cb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:clickable="false"
        android:textColor="#ff0000"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@+id/item_tv"
        android:layout_toEndOf="@+id/item_tv"
        android:layout_marginLeft="15dp"
        android:layout_marginStart="15dp" />

</RelativeLayout>