android两行代码生成二维码示例

如果你问我，生活中每天你见到最多的东西是什么，我的回答可能让你有点意外，但是确是不得不承认的现实，那就是二维码！大到高档商场，下到街边小贩，人人都能掏出一张二维码给你扫，然后你的钱就乖乖的刷走了。废话不多说了，先看效果图：
.
.
.

.
.
.

.
.
.

核心工具为：core-3.0.0.jar

关键代码我封装成一个类ZXingUtils，如下：

package com.android.qrcode;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.PointF;import android.view.Gravity;import android.view.View.MeasureSpec;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;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;import java.util.Hashtable;/** **   生成条形码和二维码的工具*/public class ZXingUtils {    /**     * 生成二维码 要转换的地址或字符串,可以是中文     *      * @param url     * @param width     * @param height     * @return     */    public static Bitmap createQRImage(String url, final int width, final int height) {        try {            // 判断URL合法性            if (url == null || "".equals(url) || url.length() < 1) {                return null;            }            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");            // 图像数据转换，使用了矩阵转换            BitMatrix bitMatrix = new QRCodeWriter().encode(url,                    BarcodeFormat.QR_CODE, width, height, hints);            int[] pixels = new int[width * height];            // 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 < height; y++) {                for (int x = 0; x < width; x++) {                    if (bitMatrix.get(x, y)) {                        pixels[y * width + x] = 0xff000000;                    } else {                        pixels[y * width + x] = 0xffffffff;                    }                }            }            // 生成二维码图片的格式，使用ARGB_8888            Bitmap bitmap = Bitmap.createBitmap(width, height,                    Config.ARGB_8888);            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);            return bitmap;        } catch (WriterException e) {            e.printStackTrace();        }        return null;    }    /**     * 生成条形码     *     * @param context     * @param contents     *            需要生成的内容     * @param desiredWidth     *            生成条形码的宽带     * @param desiredHeight     *            生成条形码的高度     * @param displayCode     *            是否在条形码下方显示内容     * @return     */    public static Bitmap creatBarcode(Context context, String contents,                                      int desiredWidth, int desiredHeight, boolean displayCode) {        Bitmap ruseltBitmap = null;        /**         * 图片两端所保留的空白的宽度         */        int marginW = 20;        /**         * 条形码的编码类型         */        BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;        if (displayCode) {            Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,                    desiredWidth, desiredHeight);            Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2                    * marginW, desiredHeight, context);            ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(                    0, desiredHeight));        } else {            ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,                    desiredWidth, desiredHeight);        }        return ruseltBitmap;    }    /**     * 生成条形码的Bitmap     *     * @param contents     *            需要生成的内容     * @param format     *            编码格式     * @param desiredWidth     * @param desiredHeight     * @return     * @throws WriterException     */    protected static Bitmap encodeAsBitmap(String contents,                                           BarcodeFormat format, int desiredWidth, int desiredHeight) {        final int WHITE = 0xFFFFFFFF;        final int BLACK = 0xFF000000;        MultiFormatWriter writer = new MultiFormatWriter();        BitMatrix result = null;        try {            result = writer.encode(contents, format, desiredWidth,                    desiredHeight, null);        } catch (WriterException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        int width = result.getWidth();        int height = result.getHeight();        int[] pixels = new int[width * height];        // All are 0, or black, by default        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,                Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }    /**     * 生成显示编码的Bitmap     *     * @param contents     * @param width     * @param height     * @param context     * @return     */    protected static Bitmap creatCodeBitmap(String contents, int width,                                            int height, Context context) {        TextView tv = new TextView(context);        LayoutParams layoutParams = new LayoutParams(                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);        tv.setLayoutParams(layoutParams);        tv.setText(contents);        tv.setHeight(height);        tv.setGravity(Gravity.CENTER_HORIZONTAL);        tv.setWidth(width);        tv.setDrawingCacheEnabled(true);        tv.setTextColor(Color.BLACK);        tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));        tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());        tv.buildDrawingCache();        Bitmap bitmapCode = tv.getDrawingCache();        return bitmapCode;    }    /**     * 将两个Bitmap合并成一个     *      * @param first     * @param second     * @param fromPoint     *            第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap）     * @return     */    protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,                                          PointF fromPoint) {        if (first == null || second == null || fromPoint == null) {            return null;        }        int marginW = 20;        Bitmap newBitmap = Bitmap.createBitmap(                first.getWidth() + second.getWidth() + marginW,                first.getHeight() + second.getHeight(), Config.ARGB_4444);        Canvas cv = new Canvas(newBitmap);        cv.drawBitmap(first, marginW, 0, null);        cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);        cv.save(Canvas.ALL_SAVE_FLAG);        cv.restore();        return newBitmap;    }}

然后就可以开始我们的生成步骤，关键性的代码就两行：

 Bitmap bitmap = ZXingUtils.createQRImage(content, iv_qr_code.getWidth(),  iv_qr_code.getHeight()); iv_qr_code.setImageBitmap(bitmap);

还是附上我的MainActivity：

public class MainActivity extends AppCompatActivity implements View.OnClickListener{    private EditText tv_qrCode_content;//用来生成二维码图片内包含的内容    private TextView tv_click;//按钮    private ImageView iv_qr_code;//显示二维码的ImageView    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findView();        inIt();    }    private void findView() {        tv_qrCode_content= (EditText) findViewById(R.id.tv_qrCode_content);        tv_click= (TextView) findViewById(R.id.tv_click);        iv_qr_code= (ImageView) findViewById(R.id.iv_qr_code);    }    private void inIt() {        tv_click.setOnClickListener(this);    }    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.tv_click:                String content = tv_qrCode_content.getText().toString().trim();                if(TextUtils.isEmpty(content)){                    Toast.makeText(MainActivity.this,"请先输入需要生成二维码的内容",Toast.LENGTH_SHORT).show();                    return;                }                Bitmap bitmap = ZXingUtils.createQRImage(content, iv_qr_code.getWidth(), iv_qr_code.getHeight());                iv_qr_code.setImageBitmap(bitmap);                break;        }    }}

到这里，就完成是，so easy！最后附上源代码