安卓图形验证码的实现

待我称王封你为后i 2021-09-26 00:20 531阅读 0赞

图形验证码的实现界面如下：  
![这里写图片描述][20160826164153095]

具体实现代码如下：

package com.example.tuxingyanzhengma;
    
    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;
    public class Code {
    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 Code bpUtil;
    private Code() {
    };
    public static Code getInstance() {
    if (bpUtil == null)
    bpUtil = new Code();
    return bpUtil;
    }
    private static final int DEFAULT_CODE_LENGTH = 4;// 验证码的长度 这里是4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 = 35;// 左边距范围值
    private static final int BASE_PADDING_TOP = 42;// 上边距
    private static final int RANGE_PADDING_TOP = 15;// 上边距范围值
    private static final int DEFAULT_WIDTH = 200;// 默认宽度.图片的总宽
    private static final int DEFAULT_HEIGHT = 70;// 默认高度.图片的总高
    private final int DEFAULT_COLOR = 0xdf;// 默认背景颜色值
    private int width = DEFAULT_WIDTH;
    private int height = DEFAULT_HEIGHT;
    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;
    private int codeLength = DEFAULT_CODE_LENGTH;
    private int line_number = DEFAULT_LINE_NUMBER;
    private int font_size = DEFAULT_FONT_SIZE;
    private String code;// 验证码
    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);
    c.restore();//
    return bp;
    }
    public String getCode() {
    return code;
    }
    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
    }
    private void randomPadding() {
    padding_left += base_padding_left + random.nextInt(range_padding_left);
    padding_top = base_padding_top + random.nextInt(range_padding_top);
    }
    }
    
    
    package com.example.tuxingyanzhengma;
    import android.R.string;
    import android.os.Bundle;
    import android.app.Activity;
    import android.content.ClipData.Item;
    import android.content.Intent;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.TextView;
    import android.widget.Toast;
    public class MainActivity extends Activity implements OnClickListener {
    ImageView vc_image; // 图片
    Button vc_shuaixi, vc_ok;
    String getCode = null;
    EditText vc_code;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    vc_image = (ImageView) findViewById(R.id.vc_image);
    vc_image.setImageBitmap(Code.getInstance().getBitmap());
    vc_code = (EditText) findViewById(R.id.vc_code);
    getCode = Code.getInstance().getCode(); // 获取显示的验证码
    vc_shuaixi = (Button) findViewById(R.id.vc_shuaixi);
    vc_shuaixi.setOnClickListener(this);
    vc_ok = (Button) findViewById(R.id.vc_ok);
    vc_ok.setOnClickListener(this);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
    }
    @Override
    public void onClick(View view) {
    // TODO Auto-generated method stub
    switch (view.getId()) {
    case R.id.vc_shuaixi:
    vc_image.setImageBitmap(Code.getInstance().getBitmap());
    getCode = Code.getInstance().getCode();
    break;
    case R.id.vc_ok:
    String v_code = vc_code.getText().toString().trim();
    if (v_code == null || v_code.equals("")) {
    Toast.makeText(MainActivity.this, "验证码为空", Toast.LENGTH_SHORT).show();
    } else if (!v_code.equals(getCode)) {
    Toast.makeText(MainActivity.this, "验证码错误", Toast.LENGTH_SHORT).show();
    } else {
    Toast.makeText(MainActivity.this, "验证成功", Toast.LENGTH_SHORT).show();
    
    }
    break;
    }
    }
    }
    
    
    
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >
    <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="77dp"
    android:text="验证码:" />
    <EditText
    android:id="@+id/vc_code"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/textView1"
    android:layout_alignBottom="@+id/textView1"
    android:layout_toRightOf="@+id/textView1"
    android:ems="10" >
    <requestFocus />
    </EditText>
    <Button
    android:id="@+id/vc_ok"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/vc_image"
    android:layout_alignRight="@+id/vc_shuaixi"
    android:layout_below="@+id/vc_shuaixi"
    android:layout_marginTop="15dp"
    android:text="确定" />
    <Button
    android:id="@+id/vc_shuaixi"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/vc_code"
    android:layout_alignTop="@+id/vc_image"
    android:layout_marginRight="20dp"
    android:text="刷新验证码" />
    <ImageView
    android:id="@+id/vc_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView1"
    android:layout_below="@+id/vc_code"
    android:layout_marginTop="25dp"
    android:src="@drawable/ic_launcher" />
    </RelativeLayout>

[20160826164153095]: /images/20210923/abf537a62cc849db836478d3cd711a87.png