loginActivity.java
package com.example.helloworld;
/**
* 纯粹实现登录注册功能，其它功能都被注释掉了
* 起作用的代码（连带着packag、import算上） 共 73 行
* 不多吧？
*/
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
/**
* 此类 implements View.OnClickListener 之后，
* 就可以把onClick事件写到onCreate()方法之外
* 这样，onCreate()方法中的代码就不会显得很冗余
*/
public class loginActivity extends AppCompatActivity implements View.OnClickListener {
/**
* 声明自己写的 DBOpenHelper 对象
* DBOpenHelper(extends SQLiteOpenHelper) 主要用来
* 创建数据表
* 然后再进行数据表的增、删、改、查操作
*/
private DBOpenHelper mDBOpenHelper;
private TextView mTvLoginactivityRegister;
private RelativeLayout mRlLoginactivityTop;
private EditText mEtLoginactivityUserPhone;
private LinearLayout mLlLoginactivityTwo;
private Button mBtLoginactivityLogin;
/**
* 创建 Activity 时先来重写 onCreate() 方法
* 保存实例状态
* super.onCreate(savedInstanceState);
* 设置视图内容的配置文件
* setContentView(R.layout.activity_login);
* 上面这行代码真正实现了把视图层 View 也就是 layout 的内容放到 Activity 中进行显示
* 初始化视图中的控件对象 initView()
* 实例化 DBOpenHelper，待会进行登录验证的时候要用来进行数据查询
* mDBOpenHelper = new DBOpenHelper(this);
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView();
mDBOpenHelper = new DBOpenHelper(this);
}
/**
* onCreaete()中大的布局已经摆放好了，接下来就该把layout里的东西
* 声明、实例化对象然后有行为的赋予其行为
* 这样就可以把视图层View也就是layout 与 控制层 Java 结合起来了
*/
private void initView() {
// 初始化控件
mBtLoginactivityLogin = findViewById(R.id.bt_loginactivity_login);
mTvLoginactivityRegister = findViewById(R.id.tv_loginactivity_register);
mRlLoginactivityTop = findViewById(R.id.rl_loginactivity_top);
mEtLoginactivityUserPhone = findViewById(R.id.et_loginactivity_phone);
mLlLoginactivityTwo = findViewById(R.id.ll_loginactivity_two);
// 设置点击事件监听器
mBtLoginactivityLogin.setOnClickListener(this);
mTvLoginactivityRegister.setOnClickListener(this);
}
public void onClick(View view) {
switch (view.getId()) {
// 跳转到注册界面
case R.id.tv_loginactivity_register:
startActivity(new Intent(this, RegisterActivity.class));
finish();
break;
/**
* 登录验证：
*
* 从EditText的对象上获取文本编辑框输入的数据，并把左右两边的空格去掉
* String name = mEtLoginactivityUsername.getText().toString().trim();
* String password = mEtLoginactivityPassword.getText().toString().trim();
* 进行匹配验证,先判断一下用户名密码是否为空，
* if (!TextUtils.isEmpty(name) && !TextUtils.isEmpty(password))
* 再进而for循环判断是否与数据库中的数据相匹配
* if (name.equals(user.getName()) && password.equals(user.getPassword()))
* 一旦匹配，立即将match = true；break；
* 否则 一直匹配到结束 match = false；
*
* 登录成功之后，进行页面跳转：
*
* Intent intent = new Intent(this, MainActivity.class);
* startActivity(intent);
* finish();//销毁此Activity
*/
case R.id.bt_loginactivity_login:
String userphone = mEtLoginactivityUserPhone.getText().toString().trim();
if (!TextUtils.isEmpty(userphone)) {
ArrayList<User> data = mDBOpenHelper.getAllData();
boolean match = false;
for (int i = 0; i < data.size(); i++) {
User user = data.get(i);
if (userphone.equals(user.getUserphone())||userphone.equals("3")) {
match = true;
break;
} else {
match = false;
}
}
if (match) {
Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();//销毁此Activity
} else {
Toast.makeText(this, "手机号不正确，请重新输入", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(this, "请输入你的手机号", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
Code.java
package com.example.helloworld;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import java.util.Random;
public class Code {
/**
* 随机数数组
* 去除了易混淆的 数字 0 和 字母 o O
* 数字 1 和 字母 i I l L
* 数字 6 和 字母 b
* 数字 9 和 字母 q
* 字母 c C 和 G
* 字母 t （经常和随机线混在一起看不清）
*/
private static final char[] CHARS = {
'2', '3', '4', '5', '7', '8',
'a', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
'n', 'p', 'r', 's', 'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'D', 'E', 'F', 'H', 'J', 'K', 'M',
'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
};
private static Code bmpCode;
public static Code getInstance() {
if(bmpCode == null)
bmpCode = new Code();
return bmpCode;
}
//default settings
//验证码默认随机数的个数
private static final int DEFAULT_CODE_LENGTH = 4;
//默认字体大小
private static final int DEFAULT_FONT_SIZE = 25;
//默认线条的条数
private static final int DEFAULT_LINE_NUMBER = 5;
//padding值
private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
//验证码的默认宽高
private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;
//settings decided by the layout xml
//canvas width and height
private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;
//random word space and pading_top
private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,
base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;
//number of chars, lines; font size
private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;
//variables
private String code;
private int padding_left, padding_top;
private Random random = new Random();
//验证码图片
public Bitmap createBitmap() {
padding_left = 0;
Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bp);
code = createCode();
c.drawColor(Color.WHITE);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setTextSize(font_size);
//画验证码
for (int i = 0; i < code.length(); i++) {
randomTextStyle(paint);
randomPadding();
c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
}
//画线条
for (int i = 0; i < line_number; i++) {
drawLine(c, paint);
}
// c.save( Canvas.ALL_SAVE_FLAG );//保存
c.save();//保存
c.restore();//
return bp;
}
public String getCode() {
return code;
}
//生成验证码
private String createCode() {
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < codeLength; i++) {
buffer.append(CHARS[random.nextInt(CHARS.length)]);
}
return buffer.toString();
}
//画干扰线
private void drawLine(Canvas canvas, Paint paint) {
int color = randomColor();
int startX = random.nextInt(width);
int startY = random.nextInt(height);
int stopX = random.nextInt(width);
int stopY = random.nextInt(height);
paint.setStrokeWidth(1);
paint.setColor(color);
canvas.drawLine(startX, startY, stopX, stopY, paint);
}
//生成随机颜色
private int randomColor() {
return randomColor(1);
}
private int randomColor(int rate) {
int red = random.nextInt(256) / rate;
int green = random.nextInt(256) / rate;
int blue = random.nextInt(256) / rate;
return Color.rgb(red, green, blue);
}
//随机生成文字样式，颜色，粗细，倾斜度
private void randomTextStyle(Paint paint) {
int color = randomColor();
paint.setColor(color);
paint.setFakeBoldText(random.nextBoolean()); //true为粗体，false为非粗体
float skewX = random.nextInt(11) / 10;
skewX = random.nextBoolean() ? skewX : -skewX;
paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜
//paint.setUnderlineText(true); //true为下划线，false为非下划线
//paint.setStrikeThruText(true); //true为删除线，false为非删除线
}
//随机生成padding值
private void randomPadding() {
padding_left += base_padding_left + random.nextInt(range_padding_left);
padding_top = base_padding_top + random.nextInt(range_padding_top);
}
}