（五十一）生成图片验证码的代码如下所示-创新互联

1、程序的结构如下所示：

2、LoginImageViewCode.java的代码如下所示

package com.app.code;
import java.util.Random;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

public class LoginImageViewCode {

private static Context context;

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 LoginImageViewCode bpUtil;

private LoginImageViewCode(Context context) {
this.context = context;
    };

public static LoginImageViewCode getInstance(Context context) {
if (bpUtil == null)
            bpUtil= new LoginImageViewCode(context);
return bpUtil;
    }

// default settings  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 = 4;// 多少条干扰线  private static final int BASE_PADDING_LEFT = 20; // 左边距  private static final int RANGE_PADDING_LEFT = 15;// 左边距范围值  private static final int BASE_PADDING_TOP = 42;// 上边距  private static final int RANGE_PADDING_TOP = 28;// 上边距范围值  private static final int DEFAULT_WIDTH = 210;// 默认宽度.图片的总宽  private static final int DEFAULT_HEIGHT = 92;// 默认高度.图片的总高  private static final int DEFAULT_POINT_NUMBER = 20;
private final int DEFAULT_COLOR = 0xff;// 默认背景颜色值

// 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 point_number = DEFAULT_POINT_NUMBER;
private int font_size = DEFAULT_FONT_SIZE;

// variables  private String code;// 保存生成的验证码  private int padding_left, padding_top;
private Random random = new Random();

private Bitmap createBitmap() {
        padding_left= 0;
// 产生一个相同大小的画布        Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        Canvas c= new Canvas(bp);

        code= createCode();

        Paint paint= new Paint();

for (int i = 0; i < code.length(); i++) {
            paint.setTextSize(font_size);
            randomTextStyle(paint);
            randomPadding();
            c.drawText(code.charAt(i)+ "", padding_left, padding_top, paint);// 以（padding_left,padding_top）为原点，使用画笔绘制文本code.charAt(i)
// //   // +
// ""        }
int redColor = context.getResources().getColor(
                R.color.login_promt_text_red);// 设置线条的颜色为红色   for (int i = 0; i < line_number; i++) {
            drawLine(c, paint, redColor);
        }

for (int i = 0; i < point_number; i++) {
            drawPoint(c, paint);
        }

        c.save(Canvas.ALL_SAVE_FLAG);// 保存        c.restore();//
   return bp;
    }

public String getCode() {
return code.toLowerCase();
    }

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 drawPoint(Canvas canvas, Paint paint) {

int color = context.getResources().getColor(R.color.login_text_gray); // 设置字体的颜色为红色   int x = random.nextInt(width);
int y = random.nextInt(height);
        paint.setStrokeWidth(3);
        paint.setColor(color);
        canvas.drawPoint(x, y, paint);
    }

private void drawLine(Canvas canvas, Paint paint, int color) {
// int color = randomColor();   int startX = random.nextInt(width);
int startY = random.nextInt(height);
int stopX = random.nextInt(width);
int stopY = random.nextInt(height);
//        int startX = (Math.abs(random.nextInt(width)))%(width+1)+width;
//        int startY = (Math.abs(random.nextInt(height)))%(height+1)+height;
//        int startX = 0;
//        int startY = random.nextInt(height);
//        int stopX = (Math.abs(random.nextInt(width)))%(width+1)+width;
//        int stopY = (Math.abs(random.nextInt(height)))%(height+1)+height;        paint.setStrokeWidth(3);
        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();   int color = context.getResources().getColor(
                R.color.login_promt_text_red);// 设置字体的颜色为红色        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    }

private void randomPadding() {
        padding_left+= base_padding_left + random.nextInt(range_padding_left);
        padding_top= base_padding_top + random.nextInt(range_padding_top);
    }
}

2、MainActivity.java的代码如下所示

package com.app.code;


import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
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.Toast;

public class MainActivity extends Activity {
    
    ImageView vc_image;
    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(LoginImageViewCode.getInstance(MainActivity.this).getBitmap());
        vc_code=(EditText) findViewById(R.id.vc_code);
        
        getCode=LoginImageViewCode.getInstance(MainActivity.this).getCode(); //获取显示的验证码        Log.e("info", getCode+"----");
        vc_shuaixi=(Button)findViewById(R.id.vc_shuaixi);
        vc_shuaixi.setOnClickListener(new OnClickListener() {
            
            @Override
public void onClick(View v) {
// TODO Auto-generated method stub                vc_image.setImageBitmap(LoginImageViewCode.getInstance(MainActivity.this).getBitmap());
                getCode=LoginImageViewCode.getInstance(MainActivity.this).getCode();
            }
        });
        
        vc_ok=(Button)findViewById(R.id.vc_ok);
        vc_ok.setOnClickListener(new OnClickListener() {
            
            @Override
public void onClick(View v) {
// TODO Auto-generated method stub            String    v_code=vc_code.getText().toString().trim();
if(v_code==null||v_code.equals("")){
                Toast.makeText(MainActivity.this, "没有填写验证码", 2).show();
            }else if(!v_code.equals(getCode)){
                Toast.makeText(MainActivity.this, "验证码填写不正确", 2).show();
            }else{
                Toast.makeText(MainActivity.this, "操作成功", 2).show();
            }
            
            }
        });
        
    }

    @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;
    }

}

3、activity_main.xml的代码如下所示

4、color.xml的代码如下所示

  #eb271c  #a8a8a8