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近期在做電商金融類的項目，驗證碼的產生方法不可缺少。先學習了一種。經過測試好用。從別處學習的代碼，稍修改了一下可選擇是否支援識別大寫和小寫。直接上代碼。
import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;
public class VerifyCodeActivity extends Activity {
private ImageView vc_image; // 驗證碼表徵圖 private String getCode = null; // 擷取驗證碼的值 private EditText vc_code; // 文字框的值
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.verifycode); vc_image = (ImageView) findViewById(R.id.verify_imv); vc_code = (EditText) findViewById(R.id.myedit); getCode = SecurityCode.getInstance().getCode(false); // 擷取顯示的驗證碼 findViewById(R.id.vc_shuaxin).setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) { vc_image.setImageBitmap(SecurityCode.getInstance().getBitmap()); getCode = SecurityCode.getInstance().getCode(false); } }); findViewById(R.id.verfiy).setOnClickListener(new OnClickListener() {
@Override public void onClick(View v) { String verfiyString = vc_code.getText().toString(); if (verfiyString.equals(getCode)) { Toast.makeText(getApplicationContext(), "驗證碼輸入正確", Toast.LENGTH_LONG).show(); } else { Toast.makeText(getApplicationContext(), "驗證碼輸入錯誤", Toast.LENGTH_LONG).show(); } } }); }}
import java.util.Locale;import java.util.Random;
import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;
/** * @Description:驗證碼產生類 */public class SecurityCode {
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 SecurityCode bpUtil;
public static SecurityCode getInstance() { if (bpUtil == null) bpUtil = new SecurityCode(); return bpUtil; }
// default settings private static final int DEFAULT_CODE_LENGTH = 4;// 驗證碼的長度 這裡是4位 private static final int DEFAULT_FONT_SIZE = 60;// 字型大小 private static final int DEFAULT_LINE_NUMBER = 3;// 多少條幹擾線 private static final int BASE_PADDING_LEFT = 20; // 左邊距 private static final int RANGE_PADDING_LEFT = 35;// 左邊距範圍值 private static final int BASE_PADDING_TOP = 42;// 上邊距 private static final int RANGE_PADDING_TOP = 15;// 上邊距範圍值 private static final int DEFAULT_WIDTH = 200;// 預設寬度.圖片的總寬 private static final int DEFAULT_HEIGHT = 70;// 預設高度.圖片的總高 private final int DEFAULT_COLOR = 0xdf;// 預設背景顏色值
// settings decided by the layout xml // canvas width and height private int width = DEFAULT_WIDTH; private int height = DEFAULT_HEIGHT;
// random word space and pading_top private int base_padding_left = BASE_PADDING_LEFT; private int range_padding_left = RANGE_PADDING_LEFT; private int base_padding_top = BASE_PADDING_TOP; private int range_padding_top = RANGE_PADDING_TOP;
// number of chars, lines; font size private int codeLength = DEFAULT_CODE_LENGTH; private int line_number = DEFAULT_LINE_NUMBER; private int font_size = DEFAULT_FONT_SIZE;
// variables private String code;// 儲存產生的驗證碼 private int padding_left, padding_top; private Random random = new Random();
private Bitmap createBitmap() { padding_left = 0;
Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888); Canvas c = new Canvas(bp);
code = createCode();
c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR)); Paint paint = new Paint(); paint.setTextSize(font_size);
for (int i = 0; i < code.length(); i++) { randomTextStyle(paint); randomPadding(); c.drawText(code.charAt(i) + "", padding_left, padding_top, paint); }
for (int i = 0; i < line_number; i++) { drawLine(c, paint); }
c.save(Canvas.ALL_SAVE_FLAG);// 儲存 c.restore();// return bp; }
/** * @Description:是否區分大寫和小寫 */ public String getCode(boolean isMatchCase) { if (isMatchCase) { if (code != null) { code.toLowerCase(Locale.getDefault()); } } else { return code; }
return null; }
public Bitmap getBitmap() { return createBitmap(); }
private String createCode() { StringBuilder buffer = new StringBuilder(); for (int i = 0; i < codeLength; i++) { buffer.append(CHARS[random.nextInt(CHARS.length)]); } return buffer.toString(); }
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); }
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); }
private void randomTextStyle(Paint paint) { int color = randomColor(); paint.setColor(color); paint.setFakeBoldText(random.nextBoolean()); // true為粗體。false為非粗體 float skewX = random.nextInt(11) / 10; skewX = random.nextBoolean() ?
skewX : -skewX; paint.setTextSkewX(skewX); // float類型參數。負數表示右斜。整數左斜 // paint.setUnderlineText(true); //true為底線。false為非底線 // paint.setStrikeThruText(true); //true為刪除線。false為非刪除線 }
private void randomPadding() { padding_left += base_padding_left + random.nextInt(range_padding_left); padding_top = base_padding_top + random.nextInt(range_padding_top); }}
布局檔案<?
xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" > <ImageView
android:id="@+id/verify_imv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" /> <Button
android:id="@+id/vc_shuaxin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="擷取驗證碼" /> <EditText
android:id="@+id/myedit"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:hint="請輸入驗證碼" /> <Button
android:id="@+id/verfiy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="驗證輸入的驗證碼是否正確" /></LinearLayout>
Android開發中驗證碼的產生
