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base: pxiqjpsm3:RegisterActivity
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pxiqjpsm3:UserActivity
pxiqjpsm3:SuggestActivity
pxiqjpsm3:RegisterActivity
pxiqjpsm3:NavActivity
pxiqjpsm3:MainActivity
pxiqjpsm3:LoginActivity
pxiqjpsm3:main
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compare: pxiqjpsm3:main
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pxiqjpsm3:UserActivity
pxiqjpsm3:SuggestActivity
pxiqjpsm3:RegisterActivity
pxiqjpsm3:NavActivity
pxiqjpsm3:MainActivity
pxiqjpsm3:LoginActivity
pxiqjpsm3:main

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RegisterAc ... main

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147
LoginActivity.java
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package com.grassroots.booktracker.activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import com.grassroots.booktracker.R;
import com.grassroots.booktracker.utils.MD5Utils;
public class LoginActivity extends AppCompatActivity {
private TextView tv_register;//返回键,显示的注册
private Button btn_login;//登录按钮
private String username, password, spPsw;//获取的用户名，密码，加密密码
private EditText etUserName, etPassword;//编辑框
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//设置此界面为竖屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
init();
}
//获取界面控件
private void init() {
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.ic_back);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//登录界面销毁
finish();
}
});
//从activity_login.xml中获取的
tv_register = findViewById(R.id.tv_register);
btn_login = findViewById(R.id.btn_login);
etUserName = findViewById(R.id.et_username);
etPassword = findViewById(R.id.et_password);
//立即注册控件的点击事件
tv_register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 为了跳转到注册界面，并实现注册功能
Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
startActivity(intent);
}
});
//登录按钮的点击事件
btn_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//开始登录，获取用户名和密码 getText().toString().trim();
username = etUserName.getText().toString().trim();
password = etPassword.getText().toString().trim();
//对当前用户输入的密码进行MD5加密再进行比对判断, MD5Utils.md5( ); psw 进行加密判断是否一致
String md5Psw = MD5Utils.md5(password);
// md5Psw ; spPsw 为 根据从SharedPreferences中用户名读取密码
// 定义方法 readPsw为了读取用户名，得到密码
spPsw = readPsw(username);
// TextUtils.isEmpty
if (TextUtils.isEmpty(username)) {
Toast.makeText(LoginActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(password)) {
Toast.makeText(LoginActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();
// md5Psw.equals(); 判断，输入的密码加密后，是否与保存在SharedPreferences中一致
} else if (md5Psw.equals(spPsw)) {
//一致登录成功
Toast.makeText(LoginActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
//保存登录状态，在界面保存登录的用户名 定义个方法 saveLoginStatus boolean 状态 , userName 用户名;
saveLoginStatus(true, username);
//登录成功后关闭此页面进入主页
Intent data = new Intent();
//datad.putExtra( ); name , value ;
data.putExtra("isLogin", true);
//RESULT_OK为Activity系统常量，状态码为-1
// 表示此页面下的内容操作成功将data返回到上一页面，如果是用back返回过去的则不存在用setResult传递data值
setResult(RESULT_OK, data);
//销毁登录界面
LoginActivity.this.finish();
// 跳转到主界面，登录成功的状态传递到 ClassificationActivity 中
startActivity(new Intent(LoginActivity.this, NavActivity.class));
} else if ((spPsw != null && !TextUtils.isEmpty(spPsw) && !md5Psw.equals(spPsw))) {
Toast.makeText(LoginActivity.this, "输入的用户名和密码不一致", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(LoginActivity.this, "此用户名不存在", Toast.LENGTH_SHORT).show();
}
}
});
}
private String readPsw(String userName) {
//getSharedPreferences("loginInfo",MODE_PRIVATE);
//"loginInfo",mode_private; MODE_PRIVATE表示可以继续写入
SharedPreferences sp = getSharedPreferences("loginInfo", MODE_PRIVATE);
//sp.getString() userName, "";
return sp.getString(userName, "");
}
private void saveLoginStatus(boolean status, String userName) {
//saveLoginStatus(true, userName);
//loginInfo表示文件名 SharedPreferences sp=getSharedPreferences("loginInfo", MODE_PRIVATE);
SharedPreferences sp = getSharedPreferences("loginInfo", MODE_PRIVATE);
//获取编辑器
SharedPreferences.Editor editor = sp.edit();
//存入boolean类型的登录状态
editor.putBoolean("isLogin", status);
//存入登录状态时的用户名
editor.putString("loginUserName", userName);
//提交修改
editor.commit();
}
/**
* 注册成功的数据返回至此
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (data != null) {
//是获取注册界面回传过来的用户名
// getExtra().getString("***");
String userName = data.getStringExtra("userName");
if (!TextUtils.isEmpty(userName)) {
//设置用户名到 et_user_name 控件
etUserName.setText(userName);
//et_user_name控件的setSelection()方法来设置光标位置
etUserName.setSelection(userName.length());
}
}
}
}

32
MainActivity.java
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package com.grassroots.booktracker.activity;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.grassroots.booktracker.R;
public class MainActivity extends AppCompatActivity {
private Button homeButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化
homeButton= (Button) findViewById(R.id.button);
//注册事件
homeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//创建Intent 对象
Intent intent=new Intent(MainActivity.this,LoginActivity.class);
//启动Activity
startActivity(intent);
}
});
}
}

72
NavActivity.java
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package com.grassroots.booktracker.activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.grassroots.booktracker.R;
public class NavActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav);
TextView tvBack = findViewById(R.id.tv_back);
tvBack.setVisibility(View.GONE);
TextView tvTitle = findViewById(R.id.tv_main_title);
tvTitle.setText("页面导航");
Button btnUserInfo = findViewById(R.id.btn_user_info);
btnUserInfo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//创建Intent 对象
Intent intent = new Intent(NavActivity.this, UserActivity.class);
//启动Activity
startActivity(intent);
}
});
Button btnBookRecommend = findViewById(R.id.btn_book_recommend);
btnBookRecommend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//创建Intent 对象
Intent intent = new Intent(NavActivity.this, SuggestActivity.class);
//启动Activity
startActivity(intent);
}
});
Button btnNoticeRemind = findViewById(R.id.btn_notice_remind);
btnNoticeRemind.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(NavActivity.this, "功能开发中", Toast.LENGTH_SHORT).show();
}
});
Button btnPermissionManage = findViewById(R.id.btn_permission_manage);
btnPermissionManage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(NavActivity.this, "功能开发中", Toast.LENGTH_SHORT).show();
}
});
Button btnLogout = findViewById(R.id.btn_logout);
btnLogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//创建Intent 对象
Intent intent = new Intent(NavActivity.this, LoginActivity.class);
//启动Activity
startActivity(intent);
finish();
}
});
}
}

144
RegisterActivity.java
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package com.grassroots.booktracker.activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.grassroots.booktracker.R;
import com.grassroots.booktracker.utils.MD5Utils;
public class RegisterActivity extends AppCompatActivity {
private TextView tv_main_title;//标题
private TextView tv_back;//返回按钮
private Button btn_register;//注册按钮
//用户名，密码，再次输入的密码的控件
private EditText et_user_name, et_psw, et_psw_again;
//用户名，密码，再次输入的密码的控件的获取值
private String userName, psw, pswAgain;
//标题布局
private RelativeLayout rl_title_bar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置页面布局 ,注册界面
setContentView(R.layout.activity_register);
//设置此界面为竖屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
init();
}
private void init() {
//从main_title_bar.xml 页面布局中获取对应的UI控件
tv_main_title = findViewById(R.id.tv_main_title);
tv_main_title.setText("注册");
tv_back = findViewById(R.id.tv_back);
//布局根元素
rl_title_bar = findViewById(R.id.title_bar);
rl_title_bar.setBackgroundColor(Color.TRANSPARENT);
//从activity_register.xml 页面中获取对应的UI控件
btn_register = findViewById(R.id.btn_register);
et_user_name = findViewById(R.id.et_user_name);
et_psw = findViewById(R.id.et_psw);
et_psw_again = findViewById(R.id.et_psw_again);
tv_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//返回键
RegisterActivity.this.finish();
}
});
//注册按钮
btn_register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//获取输入在相应控件中的字符串
getEditString();
//判断输入框内容
if (TextUtils.isEmpty(userName)) {
Toast.makeText(RegisterActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(psw)) {
Toast.makeText(RegisterActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(pswAgain)) {
Toast.makeText(RegisterActivity.this, "请再次输入密码", Toast.LENGTH_SHORT).show();
} else if (!psw.equals(pswAgain)) {
Toast.makeText(RegisterActivity.this, "输入两次的密码不一样", Toast.LENGTH_SHORT).show();
/**
*从SharedPreferences中读取输入的用户名，判断SharedPreferences中是否有此用户名
*/
} else if (isExistUserName(userName)) {
Toast.makeText(RegisterActivity.this, "此账户名已经存在", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(RegisterActivity.this, "注册成功", Toast.LENGTH_SHORT).show();
//把账号、密码和账号标识保存到sp里面
/**
* 保存账号和密码到SharedPreferences中
*/
saveRegisterInfo(userName, psw);
//注册成功后把账号传递到LoginActivity.java中
// 返回值到loginActivity显示
Intent data = new Intent();
data.putExtra("userName", userName);
setResult(RESULT_OK, data);
//RESULT_OK为Activity系统常量，状态码为-1，
// 表示此页面下的内容操作成功将data返回到上一页面，如果是用back返回过去的则不存在用setResult传递data值
RegisterActivity.this.finish();
}
}
});
}
/**
* 获取控件中的字符串
*/
private void getEditString() {
userName = et_user_name.getText().toString().trim();
psw = et_psw.getText().toString().trim();
pswAgain = et_psw_again.getText().toString().trim();
}
/**
* 从SharedPreferences中读取输入的用户名，判断SharedPreferences中是否有此用户名
*/
private boolean isExistUserName(String userName) {
boolean has_userName = false;
//mode_private SharedPreferences sp = getSharedPreferences( );
// "loginInfo", MODE_PRIVATE
SharedPreferences sp = getSharedPreferences("loginInfo", MODE_PRIVATE);
//获取密码
String spPsw = sp.getString(userName, "");//传入用户名获取密码
//如果密码不为空则确实保存过这个用户名
if (!TextUtils.isEmpty(spPsw)) {
has_userName = true;
}
return has_userName;
}
/**
* 保存账号和密码到SharedPreferences中SharedPreferences
*/
private void saveRegisterInfo(String userName, String psw) {
String md5Psw = MD5Utils.md5(psw);//把密码用MD5加密
//loginInfo表示文件名, mode_private SharedPreferences sp = getSharedPreferences( );
SharedPreferences sp = getSharedPreferences("loginInfo", MODE_PRIVATE);
//获取编辑器， SharedPreferences.Editor editor -> sp.edit();
SharedPreferences.Editor editor = sp.edit();
//以用户名为key，密码为value保存在SharedPreferences中
//key,value,如键值对，editor.putString(用户名，密码）;
editor.putString(userName, md5Psw);
//提交修改 editor.commit();
editor.commit();
}
}
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