大良营销网站建设机构,wordpress欢迎页面模板下载,做网站设计赚不赚钱,市场调研2019独角兽企业重金招聘Python工程师标准 第一步#xff1a; 确定我们二维码的位置#xff0c;即是在我们应用的哪个页面的哪个位置#xff0c;简单讲就是用一个ImageView把二维码展示出来#xff0c;我们就把二维码展示在下面布局activity_main.xml中的Imag… 2019独角兽企业重金招聘Python工程师标准 第一步 确定我们二维码的位置即是在我们应用的哪个页面的哪个位置简单讲就是用一个ImageView把二维码展示出来我们就把二维码展示在下面布局activity_main.xml中的ImageView上 ?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:orientationvertical LinearLayout android:layout_widthfill_parentandroid:layout_heightfill_parentandroid:orientationhorizontalandroid:gravitycenter_horizontalImageViewandroid:idid/imagandroid:layout_width100dpandroid:layout_height100dpandroid:scaleTypefitXYandroid:srcdrawable/ic_launcherandroid:layout_gravitycenter/ImageView/LinearLayout/LinearLayout 第二步定义一个生成二维码的工具类QRUtils.java (注意定义之前不要忘记在项目中要导入ZXing相关的jar包) 既core.jar这个包 jar包下载地址 最近使用 package com.utils;import java.util.EnumMap;
import java.util.Map;import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.text.TextUtils;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;public class QRUtils {private static final int WHITE 0xFFFFFFFF;private static final int BLACK 0xFF000000;/*** 将字符串按照指定大小生成二维码图片*/public static Bitmap encodeToQR(String contentsToEncode, int dimension)throws Exception {if (TextUtils.isEmpty(contentsToEncode))return null;BarcodeFormat format BarcodeFormat.QR_CODE;Map hints new EnumMap(EncodeHintType.class);hints.put(EncodeHintType.CHARACTER_SET, UTF-8);BitMatrix result new MultiFormatWriter().encode(contentsToEncode,format, dimension, dimension, hints);int width result.getWidth();int height result.getHeight();int[] pixels new int[width * height];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;}public static Bitmap encodeToQRWidth(String contentsToEncode, int dimension)throws Exception {if (TextUtils.isEmpty(contentsToEncode))return null;BarcodeFormat format BarcodeFormat.QR_CODE;SuppressWarnings(unchecked)Map hints new EnumMap(EncodeHintType.class);hints.put(EncodeHintType.CHARACTER_SET, UTF-8);BitMatrix result new MultiFormatWriter().encode(contentsToEncode,format, dimension, dimension, hints);int width result.getWidth();int height result.getHeight();boolean isFirstBlack true;int startX 0;int startY 0;int[] pixels new int[width * height];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;if (result.get(x, y) isFirstBlack) {isFirstBlack false;startX x;startY y;}}}Bitmap bitmap Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);Matrix m new Matrix();float sx (width 2f * startX) / width;float sy (height 2f * startY) / height;m.postScale(sx, sy);Bitmap qrBitmap Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);Canvas canvas new Canvas(qrBitmap);canvas.translate(-startX, -startY);Paint paint new Paint();paint.setAntiAlias(true);canvas.drawBitmap(bitmap, m, paint);canvas.save();return qrBitmap;}} 第三步在我们既我们的主ActivityMainActivity.java package com.action;import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
import com.utils.*;public class MainActivity extends Activity {private ImageView imag;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();}protected void initViews() {imag (ImageView) findViewById(R.id.imag);DisplayMetrics outMetrics new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(outMetrics);int w outMetrics.widthPixels * 8 / 11;// 设置宽度ViewGroup.LayoutParams layoutParams imag.getLayoutParams();layoutParams.height layoutParams.width w;// 设置高度imag.setLayoutParams(layoutParams);try {Bitmap bitmap QRUtils.encodeToQRWidth(http://write.blog.csdn.net/, w);// 要生成二维码的内容我这就是一个网址imag.setImageBitmap(bitmap);} catch (Exception e) {e.printStackTrace();Toast.makeText(this, 生成二维码失败, Toast.LENGTH_SHORT);}}} 三步完成我们的二维码生成是不是很简单 转载于:https://my.oschina.net/symahll/blog/482474
