Android二维码生成

来源：互联网发布：python实战编辑：程序博客网时间：2024/05/18 00:33

1.首先导入zxing包
2.导入工具类

/** * 二维码生成工具类 */public class QRCodeUtil {    /**     * 生成二维码Bitmap     *     * @param content   内容     * @param widthPix  图片宽度     * @param heightPix 图片高度     * @param logoBm    二维码中心的Logo图标（可以为null）     * @param filePath  用于存储二维码图片的文件路径     * @return 生成二维码及保存文件是否成功     */    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;    }}

3.在Activity中调用

public class MainActivity extends AppCompatActivity {    private EditText editText;    private ImageView imageView;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        editText = (EditText) findViewById(R.id.editText);        imageView = (ImageView) findViewById(R.id.imageView);    }    public void click(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(editText.getText().toString().trim(), 800, 800,                        false ? BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher) : 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();    }}

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