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); } }
