ZXing 生成二维码 (这里只写了生成二维码,没有写扫描二维码功能)

来源:互联网 发布:我的网络朋友圈作文 编辑:程序博客网 时间:2024/03/28 17:53

大家可以直接复制粘贴,运行之后再根据需要更改

https://pan.baidu.com/s/1hr9L5cw   这个是下载 zxing-core-3.2.0.jar包的地址.     (网上很多提供下载的貌似都是要积分什么的,很烦.)


//显示二维码的Activity

package com.app222.cn;import android.graphics.Bitmap;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.DisplayMetrics;import android.view.View;import android.widget.ImageView;import com.google.zxing.WriterException;/** * 二维码生成 */public class MainActivity extends AppCompatActivity {    private ImageView iv_qr_image;    protected int mScreenWidth ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv_qr_image = (ImageView)findViewById(R.id.iv_qr_image);        DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        mScreenWidth = dm.widthPixels;    }    //生成二维码    public void Create2QR(View v){        String uri = "http://blog.csdn.net/yanfarong";
        Bitmap bitmap;        try {            bitmap = BitmapUtil.createQRCode(uri, mScreenWidth);            if(bitmap != null){                iv_qr_image.setImageBitmap(bitmap);            }        } catch (WriterException e) {            e.printStackTrace();        }    }}


//布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:background="@android:color/white"              android:orientation="vertical" >    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginTop="30dp"        android:onClick="Create2QR"        android:text="生成二维码" />    <ImageView        android:id="@+id/iv_qr_image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        /></LinearLayout>


//工具类

package com.app222.cn;import java.util.Hashtable;import android.graphics.Bitmap;import android.util.Log;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;public class BitmapUtil {
    private static final int BLACK = 0xff000000;    /**     * 生成一个二维码图像     * @param url  传入的字符串,通常是一个URL     * @param widthAndHeight 图像的宽高     * @return     */    public static Bitmap createQRCode(String str, int widthAndHeight)            throws WriterException {        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");        BitMatrix matrix = new MultiFormatWriter().encode(str,                BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);        int width = matrix.getWidth();        int height = matrix.getHeight();        int[] pixels = new int[width * height];        for (int y = 0; y < height; y++) {            for (int x = 0; x < width; x++) {                if (matrix.get(x, y)) {                    pixels[y * width + x] = BLACK;                }            }        }        Bitmap bitmap = Bitmap.createBitmap(width, height,                Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }}