androidstudio实现图形验证码
xml文件：
android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> android:id="@+id/et_loginactivity_phoneCodes" android:layout_width="80dp" android:layout_height="50dp" android:layout_marginLeft="50dp" android:layout_marginRight="10dp" android:layout_marginTop="20dp" android:layout_weight="3" android:hint="请输入四位验证" android:textColor="#000000" android:textColorHint="#bcbcbc" /> android:id="@+id/iv_loginactivity_showCode" android:layout_width="95dp" android:layout_height="63dp" android:layout_marginTop="10dp" android:layout_weight="1.5" android:clickable="true" /> java文件： （主活动代码） private EditTextmEtloginactivityPhonecodes; private ImageViewmIvloginactivityShowcode; private StringrealCode; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mEtloginactivityPhonecodes = findViewById(R.id.et_loginactivity_phoneCodes); mIvloginactivityShowcode = findViewById(R.id.iv_loginactivity_showCode); mIvloginactivityShowcode.setImageBitmap(code.getInstance().createBitmap()); realCode = code.getInstance().getCode().toLowerCase(); //将验证码用图片的形式显示出来 mIvloginactivityShowcode.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mIvloginactivityShowcode.setImageBitmap(code.getInstance().createBitmap()); realCode = code.getInstance().getCode().toLowerCase(); //将验证码用图片的形式显示出来 } }); login.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String phoneCode =mEtloginactivityPhonecodes.getText().toString().toLowerCase(); if(phoneCode.length()==0){ Toast.makeText(MainActivity.this,"验证码不能为空",Toast.LENGTH_SHORT).show(); } else if (!phoneCode.equals(realCode)){ Toast.makeText(MainActivity.this,"验证码错误",Toast.LENGTH_SHORT).show(); } } }); } （随机生成图形验证码） package com.example.smartcommunityv2; 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 codebmpCode; public static codegetInstance() { 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 Stringcode; private int padding_left, padding_top; private Randomrandom =new Random(); //验证码图片 public BitmapcreateBitmap() { 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 randomTextStyle(paint); randomPadding(); c.drawText(code.charAt(i) +"", padding_left, padding_top, paint); } //画线条 for (int i =0; i drawLine(c, paint); } // c.save( Canvas.ALL_SAVE_FLAG );//保存 c.save();//保存 c.restore();// return bp; } public StringgetCode() { return code; } //生成验证码 private StringcreateCode() { StringBuilder buffer =new StringBuilder(); for (int i =0; 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); } }