Android 点击生成二维码功能实现代码

先看效果：

输入内容，点击生成二维码：

点击logo图案：

代码：

qrcodeutil:

package com.example.administrator.zxing;
import android.graphics.bitmap;
import android.graphics.canvas;
import com.google.zxing.barcodeformat;
import com.google.zxing.encodehinttype;
import com.google.zxing.writerexception;
import com.google.zxing.common.bitmatrix;
import com.google.zxing.qrcode.qrcodewriter;
import com.google.zxing.qrcode.decoder.errorcorrectionlevel;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.util.hashmap;
import java.util.map;
public class qrcodeutil {
  public static boolean createqrimage(string content, int widthpix, int heightpix, bitmap logobm, string filepath) {
    try {
      if (content == null || "".equals(content)) {
        return false;
      }
      //配置参数
      map<encodehinttype, object> hints = new hashmap<>();
      hints.put(encodehinttype.character_set, "utf-8");
      //容错级别
      hints.put(encodehinttype.error_correction, errorcorrectionlevel.h);
      //设置空白边距的宽度
//      hints.put(encodehinttype.margin, 2); //default is 4
      // 图像数据转换，使用了矩阵转换
      bitmatrix bitmatrix = new qrcodewriter().encode(content, barcodeformat.qr_code, widthpix, heightpix, hints);
      int[] pixels = new int[widthpix * heightpix];
      // 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 < heightpix; y++) {
        for (int x = 0; x < widthpix; x++) {
          if (bitmatrix.get(x, y)) {
            pixels[y * widthpix + x] = 0xff000000;
          } else {
            pixels[y * widthpix + x] = 0xffffffff;
          }
        }
      }
      // 生成二维码图片的格式，使用argb_8888
      bitmap bitmap = bitmap.createbitmap(widthpix, heightpix, bitmap.config.argb_8888);
      bitmap.setpixels(pixels, 0, widthpix, 0, 0, widthpix, heightpix);
      if (logobm != null) {
        bitmap = addlogo(bitmap, logobm);
      }
      //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
      return bitmap != null && bitmap.compress(bitmap.compressformat.jpeg, 100, new fileoutputstream(filepath));
    } catch (writerexception | ioexception e) {
      e.printstacktrace();
    }
    return false;
  }
  /**
   * 在二维码中间添加logo图案
   */
  private static bitmap addlogo(bitmap src, bitmap logo) {
    if (src == null) {
      return null;
    }
    if (logo == null) {
      return src;
    }
    //获取图片的宽高
    int srcwidth = src.getwidth();
    int srcheight = src.getheight();
    int logowidth = logo.getwidth();
    int logoheight = logo.getheight();
    if (srcwidth == 0 || srcheight == 0) {
      return null;
    }
    if (logowidth == 0 || logoheight == 0) {
      return src;
    }
    //logo大小为二维码整体大小的1/5
    float scalefactor = srcwidth * 1.0f / 5 / logowidth;
    bitmap bitmap = bitmap.createbitmap(srcwidth, srcheight, bitmap.config.argb_8888);
    try {
      canvas canvas = new canvas(bitmap);
      canvas.drawbitmap(src, 0, 0, null);
      canvas.scale(scalefactor, scalefactor, srcwidth / 2, srcheight / 2);
      canvas.drawbitmap(logo, (srcwidth - logowidth) / 2, (srcheight - logoheight) / 2, null);
      canvas.save(canvas.all_save_flag);
      canvas.restore();
    } catch (exception e) {
      bitmap = null;
      e.getstacktrace();
    }
    return bitmap;
  }
}

mainactivity:

package com.example.administrator.zxing;
import android.content.context;
import android.graphics.bitmapfactory;
import android.os.bundle;
import android.os.environment;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.button;
import android.widget.checkbox;
import android.widget.edittext;
import android.widget.imageview;
import java.io.file;
public class mainactivity extends appcompatactivity {
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    //内容
    final edittext contentet = (edittext) findviewbyid(r.id.create_qr_content);
    //显示二维码图片
    final imageview imageview = (imageview) findviewbyid(r.id.create_qr_iv);
    //是否添加logo
    final checkbox addlogocb = (checkbox) findviewbyid(r.id.create_qr_addlogo);
    button createqrbtn = (button) findviewbyid(r.id.create_qr_btn);
    createqrbtn.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        final string filepath = getfileroot(mainactivity.this) + file.separator
            + "qr_" + system.currenttimemillis() + ".jpg";
        //二维码图片较大时，生成图片、保存文件的时间可能较长，因此放在新线程中
        new thread(new runnable() {
          @override
          public void run() {
            boolean success = qrcodeutil.createqrimage(contentet.gettext().tostring().trim(), 800, 800,
                addlogocb.ischecked() ? bitmapfactory.decoderesource(getresources(), r.mipmap.qr_logo) : null,
                filepath);
            if (success) {
              runonuithread(new runnable() {
                @override
                public void run() {
                  imageview.setimagebitmap(bitmapfactory.decodefile(filepath));
                }
              });
            }
          }
        }).start();
      }
    });
  }
  //文件存储根目录
  private string getfileroot(context context) {
    if (environment.getexternalstoragestate().equals(environment.media_mounted)) {
      file external = context.getexternalfilesdir(null);
      if (external != null) {
        return external.getabsolutepath();
      }
    }
    return context.getfilesdir().getabsolutepath();
  }
}

布局：

 activity_main:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context="com.example.administrator.zxing.mainactivity">
  <edittext
    android:id="@+id/create_qr_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <button
      android:id="@+id/create_qr_btn"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="生成二维码" />
    <checkbox
      android:id="@+id/create_qr_addlogo"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="添加logo图案" />
  </linearlayout>
  <imageview
    android:id="@+id/create_qr_iv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
</linearlayout>

总结

以上所述是小编给大家介绍的android 点击生成二维码功能实现代码，希望对大家有所帮助