Android二维码创建实例
Android二维码之创建
实现效果图:
1.Android 有自带的jar包可以生成二维码core-3.0.0.jar,其中的com.google.zxing包
2.写一个二维码生成的工具类,网上搜的话应该一大堆。
实例代码:
package com.example.administrator.twocodedemo; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.PointF; import android.view.Gravity; import android.view.View.MeasureSpec; import android.widget.LinearLayout; import android.widget.LinearLayout.LayoutParams; import android.widget.TextView; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.MultiFormatWriter; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.QRCodeWriter; import java.util.Hashtable; /** * * 生成条形码和二维码的工具 */ public class ZXingUtils { /** * 生成二维码 要转换的地址或字符串,可以是中文 * * @param url * @param width * @param height * @return */ public static Bitmap createQRImage(String url, final int width, final int height) { try { // 判断URL合法性 if (url == null || "".equals(url) || url.length() < 1) { return null; } Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 图像数据转换,使用了矩阵转换 BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints); int[] pixels = new int[width * height]; // 下面这里按照二维码的算法,逐个生成二维码的图片, // 两个for循环是图片横列扫描的结果 for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { if (bitMatrix.get(x, y)) { pixels[y * width + x] = 0xff000000; } else { pixels[y * width + x] = 0xffffffff; } } } // 生成二维码图片的格式,使用ARGB_8888 Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); return bitmap; } catch (WriterException e) { e.printStackTrace(); } return null; } /** * 生成条形码 * * @param context * @param contents * 需要生成的内容 * @param desiredWidth * 生成条形码的宽带 * @param desiredHeight * 生成条形码的高度 * @param displayCode * 是否在条形码下方显示内容 * @return */ public static Bitmap creatBarcode(Context context, String contents, int desiredWidth, int desiredHeight, boolean displayCode) { Bitmap ruseltBitmap = null; /** * 图片两端所保留的空白的宽度 */ int marginW = 20; /** * 条形码的编码类型 */ BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128; if (displayCode) { Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight); Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2 * marginW, desiredHeight, context); ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF( 0, desiredHeight)); } else { ruseltBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight); } return ruseltBitmap; } /** * 生成条形码的Bitmap * * @param contents * 需要生成的内容 * @param format * 编码格式 * @param desiredWidth * @param desiredHeight * @return * @throws WriterException */ protected static Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int desiredWidth, int desiredHeight) { final int WHITE = 0xFFFFFFFF; final int BLACK = 0xFF000000; MultiFormatWriter writer = new MultiFormatWriter(); BitMatrix result = null; try { result = writer.encode(contents, format, desiredWidth, desiredHeight, null); } catch (WriterException e) { // TODO Auto-generated catch block e.printStackTrace(); } int width = result.getWidth(); int height = result.getHeight(); int[] pixels = new int[width * height]; // All are 0, or black, by default for (int y = 0; y < height; y++) { int offset = y * width; for (int x = 0; x < width; x++) { pixels[offset + x] = result.get(x, y) ? BLACK : WHITE; } } Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); return bitmap; } /** * 生成显示编码的Bitmap * * @param contents * @param width * @param height * @param context * @return */ protected static Bitmap creatCodeBitmap(String contents, int width, int height, Context context) { TextView tv = new TextView(context); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); tv.setLayoutParams(layoutParams); tv.setText(contents); tv.setHeight(height); tv.setGravity(Gravity.CENTER_HORIZONTAL); tv.setWidth(width); tv.setDrawingCacheEnabled(true); tv.setTextColor(Color.BLACK); tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight()); tv.buildDrawingCache(); Bitmap bitmapCode = tv.getDrawingCache(); return bitmapCode; } /** * 将两个Bitmap合并成一个 * * @param first * @param second * @param fromPoint * 第二个Bitmap开始绘制的起始位置(相对于第一个Bitmap) * @return */ protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second, PointF fromPoint) { if (first == null || second == null || fromPoint == null) { return null; } int marginW = 20; Bitmap newBitmap = Bitmap.createBitmap( first.getWidth() + second.getWidth() + marginW, first.getHeight() + second.getHeight(), Config.ARGB_4444); Canvas cv = new Canvas(newBitmap); cv.drawBitmap(first, marginW, 0, null); cv.drawBitmap(second, fromPoint.x, fromPoint.y, null); cv.save(Canvas.ALL_SAVE_FLAG); cv.restore(); return newBitmap; } } ZXingUtils
3.MainActivity
@OnClick({R.id.btn_create, R.id.iv_two_code}) public void onClick(View view) { switch (view.getId()) { case R.id.btn_create: String url = etUrl.getText().toString().trim(); Bitmap bitmap = ZXingUtils.createQRImage(url, ivTwoCode.getWidth(), ivTwoCode.getHeight()); ivTwoCode.setImageBitmap(bitmap);
例如:
String company=etCompany.getText().toString().trim() ; String phone =etPhone .getText().toString().trim() ; String email = etEmail.getText().toString().trim() ; String web = etWeb.getText().toString().trim() ; //二维码中包含的文本信息 String contents= "BEGIN:VCARD\nVERSION:3.0\nORG:"+company+"\nTEL:"+phone+"\nURL:"+web+"\nEMAIL:"+email+"\nEND:VCARD"; try { //调用方法createCode生成二维码 Bitmap bm=createCode(contents, logo, BarcodeFormat.QR_CODE);
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