Android studio登录注册图形随机验证码

给上activity_main.xml布局代码：

<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="${relativePackage}.${activityClass}" >    <LinearLayout         android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_marginLeft="10dp"        android:orientation="vertical">        <ImageView             android:id="@+id/image"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:src="@drawable/ic_launcher"/>        <EditText             android:id="@+id/et"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:hint="输入验证码"/>        <Button             android:id="@+id/btn"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:text="获得验证码"/>        <Button             android:id="@+id/btn_submit"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:text="提交"/>    </LinearLayout></RelativeLayout>

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);      }  }  

其中，在Default Settings中可以设置验证码图形的大小，验证码的长度，内边距，随机距离等可以根据需要进行调整。