Android 验证码功能实现代码_安卓软件开发教程-查字典教程网

摘要：先给大家展示下效果图，如果大家感觉还不错，请参考实现代码很简单的一个例子,点击刷新验证码,刷新当前显示的验证码,点击确定,如果输入的和显示的...

先给大家展示下效果图，如果大家感觉还不错，请参考实现代码

很简单的一个例子,点击刷新验证码,刷新当前显示的验证码,点击确定,如果输入的和显示的匹配,就会跳转到下一个界面中,这里只是实现了跳转,并没有进行其它的操作

好了接下来就是代码了

首先看MainActivity的布局

MainActivity代码

package com.example.yanzhengma; 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(); Intent itIntent = new Intent(MainActivity.this, secondActivity.class); startActivity(itIntent); MainActivity.this.finish(); } break; } } }

好了,到重点部分了,绘制验证码

package com.example.yanzhengma; 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); } }

好了代码都有注释,应该会看的明白的

以上所述是小编给大家介绍的Android 验证码功能实现代码，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！