<Android>Xutils的本地数据库的使用---登录注册等

这个数据库的基本使用上篇中已经讲过了，今天就是怎么实现简单的本地注册登录等功能

不啰嗦，直接上代码：1、bean类

package com.sdp.panda.pictrueapp.bean;/** * Created by 80926 on 2016/10/20. */public class UserBean {    private String name;    private String password;    private int id;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    @Override    public String toString() {        return "UserBean{" +                "name='" + name + '\'' +                ", password='" + password + '\'' +                ", id=" + id +                '}';    }}

2、三个布局文件    1.activity_forget.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="match_parent">    <EditText        android:id="@+id/et_forget_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/biaoqingbao"        android:layout_marginTop="164dp"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:background="@null"        android:hint="输入用户名"/>    <EditText        android:id="@+id/et_forget_password"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/hongbao"        android:hint="输入密码"        android:background="@null"        android:layout_below="@+id/et_forget_name"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="14dp" />    <EditText        android:id="@+id/et_re_forget_password"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/hongbao"        android:hint="再输入一遍"        android:background="@null"        android:layout_below="@+id/et_forget_password"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="18dp" />    <Button        android:id="@+id/btn_forget"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="更改密码"        android:textColor="#ff00"        android:layout_below="@+id/et_re_forget_password"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="10dp" /></RelativeLayout>

2.activity_user.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="match_parent">    <EditText        android:id="@+id/et_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/biaoqingbao"        android:layout_marginTop="164dp"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:background="@null"        android:hint="输入用户名"/>    <EditText        android:id="@+id/et_password"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/hongbao"        android:hint="输入密码"        android:background="@null"        android:layout_below="@+id/et_name"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="14dp" />    <Button        android:id="@+id/btn_login"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="登录"        android:textColor="#ff00"        android:layout_below="@+id/et_password"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="10dp" />    <TextView        android:id="@+id/tv_forget"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="忘记密码"        android:textSize="18sp"        android:textColor="#00ff00"        android:layout_below="@+id/btn_login"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="12dp" />    <TextView        android:id="@+id/tv_resiger"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="注册新用户"        android:textSize="18sp"        android:textColor="#00ff00"        android:layout_alignBaseline="@+id/tv_forget"        android:layout_alignBottom="@+id/tv_forget"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true" /></RelativeLayout>

3.activity_resgiter.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="match_parent">    <EditText        android:id="@+id/et_res_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/biaoqingbao"        android:layout_marginTop="164dp"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:background="@null"        android:hint="输入用户名"/>    <EditText        android:id="@+id/et_res_password"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/hongbao"        android:hint="输入密码"        android:background="@null"        android:layout_below="@+id/et_res_name"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="14dp" />    <EditText        android:id="@+id/et_re_res_password"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:drawableLeft="@mipmap/hongbao"        android:hint="再输入一遍"        android:background="@null"        android:layout_below="@+id/et_res_password"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="18dp" />    <Button        android:id="@+id/btn_res_resigter"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="注册"        android:textColor="#ff00"        android:layout_below="@+id/et_re_res_password"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="10dp" /></RelativeLayout>

3、三个Activity1.UserActivity

package com.sdp.panda.pictrueapp;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;import com.lidroid.xutils.db.sqlite.Selector;import com.lidroid.xutils.exception.DbException;import com.sdp.panda.pictrueapp.app.MyApp;import com.sdp.panda.pictrueapp.bean.UserBean;/** * Created by 80926 on 2016/10/20. */public class UserActivity extends Activity implements View.OnClickListener {    private Button btnLogin;    private TextView tvResig;    private TextView tvForget;    private EditText etPassword;    private EditText etName;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_uesr);        initData();        initView();    }    private void initData() {    }    private void initView() {        etName = (EditText) findViewById(R.id.et_name);        etPassword = (EditText) findViewById(R.id.et_password);        tvForget = (TextView) findViewById(R.id.tv_forget);        tvResig = (TextView) findViewById(R.id.tv_resiger);        btnLogin = (Button) findViewById(R.id.btn_login);        btnLogin.setOnClickListener(this);        tvForget.setOnClickListener(this);        tvResig.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.btn_login:                String name = etName.getText().toString().trim();                String  password= etPassword.getText().toString().trim();                //进行判断如果查询不到name，或者密码不匹配提示不存在用户名或者重新输入密码                try {                    UserBean userFindName = MyApp.dbUtils.findFirst(Selector.from(UserBean.class).where("name", "=", name));                    if (userFindName==null){                        Toast.makeText(this, "用户名不存在", Toast.LENGTH_SHORT).show();                        etName.setText("");                        etPassword.setText("");                    }else {                        String userFindPassword = userFindName.getPassword();                        if (!userFindPassword.equals(password)){                            Toast.makeText(this, "密码错误,请重新输入", Toast.LENGTH_SHORT).show();                            SharedPreferences.Editor edit = MyApp.sp.edit();                            edit.putString("name",name);                            edit.commit();                            etPassword.setText("");                        }else {                            Toast.makeText(this, "登陆成功", Toast.LENGTH_SHORT).show();                            startActivity(new Intent(this,InfoActivity.class));                        }                    }                } catch (DbException e) {                    e.printStackTrace();                }                break;            case R.id.tv_forget:                startActivity(new Intent(this,ForgetActivity.class));                break;            case R.id.tv_resiger:                Intent intent = new Intent(this,ResigterActivity.class);                startActivity(intent);                break;        }    }    @Override    protected void onDestroy() {        super.onDestroy();    }}

2.ResigterActivity

package com.sdp.panda.pictrueapp;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.lidroid.xutils.db.sqlite.Selector;import com.lidroid.xutils.exception.DbException;import com.sdp.panda.pictrueapp.app.MyApp;import com.sdp.panda.pictrueapp.bean.UserBean;/** * Created by 80926 on 2016/10/20. */public class ResigterActivity extends Activity implements View.OnClickListener {    private Button btnLogin;    private EditText etPassword,etRePassword;    private EditText etName;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_resigter);        initView();    }    private void initView() {        etName = (EditText) findViewById(R.id.et_res_name);        etPassword = (EditText) findViewById(R.id.et_res_password);        etRePassword = (EditText) findViewById(R.id.et_re_res_password);        btnLogin = (Button) findViewById(R.id.btn_res_resigter);        btnLogin.setOnClickListener(this);    }    @Override    public void onClick(View v) {        String name = etName.getText().toString().trim();        String password = etPassword.getText().toString().trim();        String rePassword = etRePassword.getText().toString().trim();        if (!name.equals("")&&!password.equals("")&&!rePassword.equals("")){            if (password.equals(rePassword)){                UserBean userBean = new UserBean();                userBean.setName(name);                userBean.setPassword(password);                try {                    UserBean userFindName = MyApp.dbUtils.findFirst(Selector.from(UserBean.class).where("name", "=", name));                    if (userFindName==null) {                        MyApp.dbUtils.save(userBean);                        Toast.makeText(this, "注册成功", Toast.LENGTH_SHORT).show();                        finish();                    }else {                        Toast.makeText(this, "用户名已注册，重新输入", Toast.LENGTH_SHORT).show();                        etName.setText("");                        etPassword.setText("");                        etRePassword.setText("");                    }                } catch (DbException e) {                    e.printStackTrace();                }            }else {                Toast.makeText(this, "两次密码不一致", Toast.LENGTH_SHORT).show();                etPassword.setText("");                etRePassword.setText("");            }        }else {            Toast.makeText(this, "不能为空", Toast.LENGTH_SHORT).show();            etRePassword.setText("");            etPassword.setText("");            etName.setText("");        }    }}

3.ForgetActivity

package com.sdp.panda.pictrueapp;import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import com.lidroid.xutils.db.sqlite.Selector;import com.lidroid.xutils.exception.DbException;import com.sdp.panda.pictrueapp.app.MyApp;import com.sdp.panda.pictrueapp.bean.UserBean;/** * Created by 80926 on 2016/10/20. */public class ForgetActivity extends Activity implements View.OnClickListener {    private Button btnLogin;    private EditText etPassword,etRePassword;    private EditText etName;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_forget);        initView();    }    private void initView() {        etName = (EditText) findViewById(R.id.et_forget_name);        etPassword = (EditText) findViewById(R.id.et_forget_password);        etRePassword = (EditText) findViewById(R.id.et_re_forget_password);        btnLogin = (Button) findViewById(R.id.btn_forget);        etName.setText(MyApp.sp.getString("name",""));        btnLogin.setOnClickListener(this);    }    @Override    public void onClick(View v) {        String name = etName.getText().toString().trim();        String password = etPassword.getText().toString().trim();        String rePassword = etRePassword.getText().toString().trim();        if (!name.equals("")&&!password.equals("")&&!rePassword.equals("")){            try {                UserBean userFindName = MyApp.dbUtils.findFirst(Selector.from(UserBean.class).where("name", "=", name));                if(userFindName == null){                    Toast.makeText(this, "用户名不存在", Toast.LENGTH_SHORT).show();                    etRePassword.setText("");                    etPassword.setText("");                    etName.setText("");                }else {                    if (password.equals(rePassword)) {                        MyApp.dbUtils.delete(userFindName);                        UserBean userBean = new UserBean();                        userBean.setPassword(password);                        userBean.setName(name);                        MyApp.dbUtils.save(userBean);                        Toast.makeText(this, "密码更改完成", Toast.LENGTH_SHORT).show();                        finish();                    }else {                        Toast.makeText(this, "两次密码不一致", Toast.LENGTH_SHORT).show();                        etPassword.setText("");                        etRePassword.setText("");                    }                }            } catch (DbException e) {                e.printStackTrace();            }        }else {            Toast.makeText(this, "不能为空", Toast.LENGTH_SHORT).show();            etName.setText("");            etPassword.setText("");            etRePassword.setText("");        }    }}