转载请注明出处：王亟亟的大牛之路
上一篇博文写了一个生成二维码的，这一篇来一个随机数的。 包目录
运行效果：
就是画了一串东西然后放入imageview 话不多说直接上代码：
{ProgressDialog mLoadingDialog;Button ShowCAPTCHAD;ImageView imageview;Bitmap validateCodeImage;(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imageview=(ImageView)findViewById(R.id.imageview);ShowCAPTCHAD=(Button)findViewById(R.id.ShowCAPTCHAD);ShowCAPTCHAD.setOnClickListener(new OnClickListener() {(View v) {showLoadingDialog(“Loading……”);//回收bitmapif(null != validateCodeImage && !validateCodeImage.isRecycled()){validateCodeImage.recycle();validateCodeImage = null;}//生成图片validateCodeImage =makeValidateCode(200, 70);imageview.setImageBitmap(validateCodeImage);Toast.makeText(MainActivity.this, “验证码生成成功”+”验证码是”+gainValidateCodeValue(), Toast.LENGTH_SHORT).show();dismissLoadingDialog();}});}(String msg) {if (mLoadingDialog != null && mLoadingDialog.isShowing()) {return;}mLoadingDialog = new ProgressDialog(this);mLoadingDialog.setMessage(msg);// mLoadingDialog.setOnKeyListener(mOnKeyListener);// mLoadingDialog.setCancelable(false);mLoadingDialog.show();}/*** 取消加载对话框*/() {if (mLoadingDialog != null) {mLoadingDialog.dismiss();}}(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}(MenuItem item) {id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/*** 获取验证码图片* @param width 验证码宽度* @param height 验证码高度* @return 验证码Bitmap对象*/Bitmap makeValidateCode(int width, int height){return ValidateCodeGenerator.createBitmap(width, height);}/*** 获取验证码值* @return 验证码字符串*/String gainValidateCodeValue(){return ValidateCodeGenerator.getCode();}/*** 随机生成验证码内部类**/final static class ValidateCodeGenerator{[] 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’,};DEFAULT_CODE_LENGTH = 4;DEFAULT_FONT_SIZE = 30;DEFAULT_LINE_NUMBER =BASE_PADDING_LEFT = 15, RANGE_PADDING_LEFT = 10, BASE_PADDING_TOP = 35, RANGE_PADDING_TOP = 20;DEFAULT_WIDTH = 60, DEFAULT_HEIGHT = 30;String value;padding_left, padding_top;private static Random random = new Random();public static Bitmap createBitmap(int width,int height) {padding_left = 0;//创建画布Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);Canvas c = new Canvas(bp);//随机生成验证码字符StringBuilder buffer = new StringBuilder();for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) {buffer.append(CHARS[random.nextInt(CHARS.length)]);}value = buffer.toString();//设置颜色c.drawColor(Color.WHITE);//设置画笔大小Paint paint = new Paint();paint.setTextSize(DEFAULT_FONT_SIZE);for (int i = 0; i < value.length(); i++) {//随机样式randomTextStyle(paint);padding_left += BASE_PADDING_LEFT + random.nextInt(RANGE_PADDING_LEFT);padding_top = BASE_PADDING_TOP + random.nextInt(RANGE_PADDING_TOP);c.drawText(value.charAt(i) + “”, padding_left, padding_top, paint);}for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) {drawLine(c, paint);}//保存 c.save(Canvas.ALL_SAVE_FLAG);c.restore();return bp;}public static String getCode() {return value;}(Paint paint) {int color = randomColor(1);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}(Canvas canvas, Paint paint) {int color = randomColor(1);int startX = random.nextInt(DEFAULT_WIDTH);int startY = random.nextInt(DEFAULT_HEIGHT);int stopX = random.nextInt(DEFAULT_WIDTH);int stopY = random.nextInt(DEFAULT_HEIGHT);paint.setStrokeWidth(1);paint.setColor(color);canvas.drawLine(startX, startY, stopX, stopY, paint);}(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);}}() {// TODO Auto-generated method stubsuper.onDestroy();if(null != validateCodeImage && !validateCodeImage.isRecycled()){validateCodeImage.recycle();validateCodeImage = null;}System.gc();}}你不勇敢，没人替你坚强！
