Android系统下二维码图像生成

来源：互联网发布：销售数据统计编辑：程序博客网时间：2024/05/16 15:00
import java.io.File;import java.io.FileOutputStream;import java.util.HashMap;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.os.Environment;import android.view.ViewGroup.LayoutParams;import android.widget.ImageView;import android.widget.ImageView.ScaleType;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;/** *  * Android中二维码编码及图像生成 *  */public class QRCodeCreatorActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        String content = "http://orgcent.com/";        final int desiredWidth = 120;        final int desiredHeight = 120;        final String imageFileName = "orgcent.com.png";        FileOutputStream fos = null;        Bitmap bitmap = null;        try {//生成二维码图像            bitmap = encodeAsBitmap(content, BarcodeFormat.QR_CODE, desiredWidth, desiredHeight);            if(null != bitmap) {//将二维码图像保存到文件                File file = new File(Environment.getExternalStorageDirectory(), imageFileName);                fos = new FileOutputStream(file);                bitmap.compress(Bitmap.CompressFormat.PNG, 0, fos);            }        } catch (Exception e) {            e.printStackTrace();        } finally {            if(null != fos) {                try {                    fos.close();                } catch (Exception e) {}            }        }        //显示QRCode        if(null != bitmap) {            ImageView iv = new ImageView(this);            iv.setImageBitmap(bitmap);            iv.setScaleType(ScaleType.FIT_CENTER);            setContentView(iv,new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));        }    }    static Bitmap encodeAsBitmap(String contents, BarcodeFormat format,            int desiredWidth, int desiredHeight) throws WriterException {        final int WHITE = 0xFFFFFFFF; //可以指定其他颜色，让二维码变成彩色效果        final int BLACK = 0xFF000000;                HashMap<EncodeHintType, String> hints = null;        String encoding = guessAppropriateEncoding(contents);        if (encoding != null) {            hints = new HashMap<EncodeHintType, String>(2);            hints.put(EncodeHintType.CHARACTER_SET, encoding);        }        MultiFormatWriter writer = new MultiFormatWriter();        BitMatrix result = writer.encode(contents, format, desiredWidth,                desiredHeight, hints);        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,                Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }    private static String guessAppropriateEncoding(CharSequence contents) {        // Very crude at the moment        for (int i = 0; i < contents.length(); i++) {            if (contents.charAt(i) > 0xFF) {                return "UTF-8";            }        }        return null;    }}
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