使用google.zxing制作条形码和二维码

跟着别人学滴，特此记录一下。

1.添加依赖：

compile 'com.google.zxing:core:3.3.0'

2.布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginTop="10dp"
        android:gravity="center"
        android:layout_gravity="center_horizontal">
        <EditText
            android:id="@+id/ed_code_text"
            android:layout_alignParentTop="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入条码内容"/>
        <Button
            android:id="@+id/btn_bar_code"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="生成一维条码"/>
        <Button
            android:id="@+id/btn_qr_code"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="生成二维码"/>
    </LinearLayout>
    <ImageView
        android:id="@+id/img_code"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>

</RelativeLayout>

3.activity代码：

public class HomeActivity extends AppCompatActivity {

    @BindView(R.id.ed_code_text)
    EditText edCodeText;
    @BindView(R.id.btn_bar_code)
    Button btnBarCode;
    @BindView(R.id.btn_qr_code)
    Button btnQrCode;
    @BindView(R.id.img_code)
    ImageView imgCode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        ButterKnife.bind(this);
    }

    /**
     * 制作二维码
     */
    public void makeQRCode(String qrCodeText){
        Bitmap bmp = null;
        try {
            if (!TextUtils.isEmpty(qrCodeText)) {
                bmp = CreateTwoDCode(qrCodeText);
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }
        if (bmp != null) {
            imgCode.setImageBitmap(bmp);
        }
    }

    /**
     * 制作条形码
     */
    public void makeBarCode(String barCode){
        int size = barCode.length();
        for (int i = 0; i < size; i++) {
            int c = barCode.charAt(i);
            if ((19968 <= c && c < 40623)) {
                Toast.makeText(HomeActivity.this, "生成条形码的时刻不能是中文", Toast.LENGTH_SHORT).show();
                return;
            }
        }
        Bitmap bmp = null;
        try {
            if (!TextUtils.isEmpty(barCode)) {
                bmp = CreateOneDCode(barCode);
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }
        if (bmp != null) {
            imgCode.setImageBitmap(bmp);
        }
    }

    /**
     * 将指定的内容生成二维码
     *
     * @param content 将要生成二维码的内容
     * @return 返回生成好的二维码事件
     * @throws WriterException WriterException异常
     */
    public Bitmap CreateTwoDCode(String content) throws WriterException {
        // 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
        int imgWidth = this.getResources().getDisplayMetrics().widthPixels / 2;
        int imgHeight = imgWidth ;

        BitMatrix matrix = new MultiFormatWriter().encode(content,
                BarcodeFormat.QR_CODE, imgWidth, imgHeight);
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        // 二维矩阵转为一维像素数组,也就是一直横着排了
        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] = 0xff000000;
                }
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        // 通过像素数组生成bitmap,具体参考api
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }

    /**
     * 用于将给定的内容生成成一维条码 注：目前生成内容为中文的话将直接报错，要修改底层jar包的内容
     *
     * @param content 将要生成一维条码的内容
     * @return 返回生成好的一维条码bitmap
     * @throws WriterException WriterException异常
     */
    public Bitmap CreateOneDCode(String content) throws WriterException {
        // 生成一维条码,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
        int imgWidth = this.getResources().getDisplayMetrics().widthPixels - 40;
        int imgHeight = imgWidth / 5 * 2;

        BitMatrix matrix = new MultiFormatWriter().encode(content,
                BarcodeFormat.CODE_128, imgWidth, imgHeight);
        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] = 0xff000000;
                }
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        // 通过像素数组生成bitmap,具体参考api
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }

    @OnClick({R.id.btn_bar_code, R.id.btn_qr_code})
    public void onViewClicked(View view) {

        switch (view.getId()) {
            case R.id.btn_bar_code:
                String barCodeText = edCodeText.getText().toString().trim();
                makeBarCode(barCodeText);//二维码
                break;
            case R.id.btn_qr_code:
                String qrCodeText = edCodeText.getText().toString().trim();
                makeQRCode(qrCodeText);//一维条码
                break;
        }
    }
}