android图形验证码
16lz
2021-01-23
废话不多说上效果图：
给上activity_main.xml布局代码：
再上mainactivity代码：
package com.example.codedemo;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private ImageView image;private EditText et;private Button btn,submit;private String codeStr;private CodeUtils codeUtils;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {image = (ImageView) findViewById(R.id.image);et = (EditText) findViewById(R.id.et);btn = (Button) findViewById(R.id.btn);submit = (Button) findViewById(R.id.btn_submit);btn.setOnClickListener(this);submit.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn:codeUtils = CodeUtils.getInstance();Bitmap bitmap = codeUtils.createBitmap();image.setImageBitmap(bitmap);break;case R.id.btn_submit:codeStr = et.getText().toString().trim();Log.e("codeStr", codeStr);if (null == codeStr || TextUtils.isEmpty(codeStr)) {Toast.makeText(this, "请输入验证码", 0).show();return;}String code = codeUtils.getCode();Log.e("code", code);if (code.equalsIgnoreCase(codeStr)) {Toast.makeText(this, "验证码正确", 0).show();} else {Toast.makeText(this, "验证码错误", 0).show();}break;default:break;}}}最后附上CodeUtils代码：
package com.example.codedemo;import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import java.util.Random; /** * Created by yao * 用于图片验证码的工具类 */ public class CodeUtils { private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; private static CodeUtils mCodeUtils; private int mPaddingLeft, mPaddingTop; private StringBuilder mBuilder = new StringBuilder(); private Random mRandom = new Random(); //Default Settings private static final int DEFAULT_CODE_LENGTH = 6;//验证码的长度 这里是6位 private static final int DEFAULT_FONT_SIZE = 60;//字体大小 private static final int DEFAULT_LINE_NUMBER = 3;//多少条干扰线 private static final int BASE_PADDING_LEFT = 20; //左边距 private static final int RANGE_PADDING_LEFT = 30;//左边距范围值 private static final int BASE_PADDING_TOP = 70;//上边距 private static final int RANGE_PADDING_TOP = 15;//上边距范围值 private static final int DEFAULT_WIDTH = 300;//默认宽度.图片的总宽 private static final int DEFAULT_HEIGHT = 100;//默认高度.图片的总高 private static final int DEFAULT_COLOR = 0xDF;//默认背景颜色值 private String code; public static CodeUtils getInstance() { if(mCodeUtils == null) { mCodeUtils = new CodeUtils(); } return mCodeUtils; } //生成验证码图片 public Bitmap createBitmap() { mPaddingLeft = 0; //每次生成验证码图片时初始化 mPaddingTop = 0; Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); code = createCode(); canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR)); Paint paint = new Paint(); paint.setTextSize(DEFAULT_FONT_SIZE); for (int i = 0; i < code.length(); i++) { randomTextStyle(paint); randomPadding(); canvas.drawText(code.charAt(i) + "" , mPaddingLeft, mPaddingTop, paint); } //干扰线 for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) { drawLine(canvas, paint); } canvas.save(Canvas.ALL_SAVE_FLAG);//保存 canvas.restore(); return bitmap; } /** * 得到图片中的验证码字符串 * @return */ public String getCode() { return code; } //生成验证码 public String createCode() { mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容 for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) { mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]); } return mBuilder.toString(); } //生成干扰线 private void drawLine(Canvas canvas, Paint paint) { int color = randomColor(); int startX = mRandom.nextInt(DEFAULT_WIDTH); int startY = mRandom.nextInt(DEFAULT_HEIGHT); int stopX = mRandom.nextInt(DEFAULT_WIDTH); int stopY = mRandom.nextInt(DEFAULT_HEIGHT); paint.setStrokeWidth(1); paint.setColor(color); canvas.drawLine(startX, startY, stopX, stopY, paint); } //随机颜色 private int randomColor() { mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容 String haxString; for (int i = 0; i < 3; i++) { haxString = Integer.toHexString(mRandom.nextInt(0xFF)); if (haxString.length() == 1) { haxString = "0" + haxString; } mBuilder.append(haxString); } return Color.parseColor("#" + mBuilder.toString()); } //随机文本样式 private void randomTextStyle(Paint paint) { int color = randomColor(); paint.setColor(color); paint.setFakeBoldText(mRandom.nextBoolean()); //true为粗体，false为非粗体 float skewX = mRandom.nextInt(11) / 10; skewX = mRandom.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 } //随机间距 private void randomPadding() { mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT); mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP); } } 更多相关文章
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