通过zxing创建条码图片

package com.print.qs5803;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.HashMap;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PointF;
import android.view.View;
import android.widget.LinearLayout;
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;

/**
 * 通过zxing创建条码图片
 * 
 * @author yi.zhe
 * @time 2014-9-23 下午1:54:29
 */
public abstract class BarcodeCreater {
	private static int marginW = 20;

	public static BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;

	public static Bitmap creatBarcode(Context context, String contents, int desiredWidth, int desiredHeight,
			boolean displayCode, int barType) {
		Bitmap ruseltBitmap = null;
		if (barType == 1)
			barcodeFormat = BarcodeFormat.CODE_128;
		else if (barType == 2) {
			barcodeFormat = BarcodeFormat.QR_CODE;
		}
		if (displayCode) {
			Bitmap barcodeBitmap = null;
			try {
				barcodeBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight);
			} catch (WriterException e) {
				e.printStackTrace();
			}
			Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth, desiredHeight, context);
			ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(0.0F, desiredHeight));
		} else {
			try {
				ruseltBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight);
			} catch (WriterException e) {
				e.printStackTrace();
			}
		}

		return ruseltBitmap;
	}

	public static Bitmap creatCodeBitmap(String contents, int width, int height, Context context) {
		TextView tv = new TextView(context);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(width, height);
		tv.setLayoutParams(layoutParams);
		tv.setText(contents);
		tv.setHeight(48);
		tv.setTextSize(25.0F);
		tv.setGravity(1);
		tv.setWidth(width);
		tv.setDrawingCacheEnabled(true);
		tv.setTextColor(-16777216);
		tv.setBackgroundColor(-1);
		tv.measure(View.MeasureSpec.makeMeasureSpec(0, 0), View.MeasureSpec.makeMeasureSpec(0, 0));
		tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());

		tv.buildDrawingCache();
		Bitmap bitmapCode = tv.getDrawingCache();
		return bitmapCode;
	}

	public static Bitmap encode2dAsBitmap(String contents, int desiredWidth, int desiredHeight, int barType) {
		if (barType == 1)
			barcodeFormat = BarcodeFormat.CODE_128;
		else if (barType == 2) {
			barcodeFormat = BarcodeFormat.QR_CODE;
		}
		Bitmap barcodeBitmap = null;
		try {
			barcodeBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight);
		} catch (WriterException e) {
			e.printStackTrace();
		}
		return barcodeBitmap;
	}

	public static Bitmap mixtureBitmap(Bitmap first, Bitmap second, PointF fromPoint) {
		if ((first == null) || (second == null) || (fromPoint == null)) {
			return null;
		}

		Bitmap newBitmap = Bitmap.createBitmap(first.getWidth(), first.getHeight() + second.getHeight(),
				Bitmap.Config.ARGB_4444);
		Canvas cv = new Canvas(newBitmap);
		cv.drawBitmap(first, 0.0F, 0.0F, null);
		cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);
		cv.save(31);
		cv.restore();

		return newBitmap;
	}

	public static Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int desiredWidth,
			int desiredHeight) throws WriterException {
		int WHITE = -1;
		int BLACK = -16777216;

		HashMap hints = null;
		String encoding = guessAppropriateEncoding(contents);
		if (encoding != null) {
			hints = new HashMap(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];

		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) ? -16777216 : -1);
			}
		}

		Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		return bitmap;
	}

	public static String guessAppropriateEncoding(CharSequence contents) {
		for (int i = 0; i < contents.length(); i++) {
			if (contents.charAt(i) > 'ÿ') {
				return "UTF-8";
			}
		}
		return null;
	}

	public static boolean saveBitmap2file(Bitmap bmp, String filename) {
		Bitmap.CompressFormat format = Bitmap.CompressFormat.JPEG;
		int quality = 100;
		OutputStream stream = null;
		try {
			stream = new FileOutputStream("/sdcard/" + filename);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}

		return bmp.compress(format, quality, stream);
	}
}