Dev

login/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

login/app/.gitignore

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+/build

login/app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "com.example.login"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+}

login/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

login/app/src/androidTest/java/com/example/login/ExampleInstrumentedTest.java

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+package com.example.login;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.login", appContext.getPackageName());
+    }
+}

login/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.login">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Login">
+        <activity android:name=".RegisterActivity"></activity>
+        <activity android:name=".MainActivity" />
+        <activity android:name=".LoginActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

login/app/src/main/java/com/example/login/Code.java

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+package com.example.login;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+
+import java.util.Random;
+
+/**
+ * Created by littlecurl 2018/6/24
+ */
+
+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);
+    }
+}
+