个人冲刺（五）——体温上报app（二阶段）

冲刺任务：完成用户登录和随机验证码功能

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);
    }
}