可以使用Zxing來獲得條形碼的bitmap.
1.繪製帶有文字的條形碼
由於直接不能繪製出帶有文字的條形碼.
我想到的解決方案是 需要繪製的條形碼的高度的 3/4給條形碼 1/4給文字.
先繪製條形碼 得到bitmap 在建立bitmap 在底部繪製文字,合併兩個bitmap.

2.繪製不帶文字的條形碼,只需要把繪製文字和bigbitmap去掉就行了.

3.使用程式碼需要先引入Zxing庫


import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.yiersan.wmsclient.utils.LogUtil;

import java.util.EnumMap;
import java.util.Map;

/**
 * 使用Zxing生成二維碼
 */
public class Barcode {

    private static final int WHITE = 0xFFFFFFFF;
    private static final int BLACK = 0xFF000000;
   /**
    *
    * @param content 文字內容
    * @param qrWidth 條形碼的寬度
    * @param qrHeight 條形碼的高度
    * @return bitmap
    */
    public static Bitmap getBarcodeBitmap(String content, int qrWidth, int qrHeight) {
        content = content.trim();
        //文字的高度
        int mHeight = qrHeight / 4;
        try {
            Map<EncodeHintType, Object> hints = new EnumMap(EncodeHintType.class);
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix result;
            try {
                result = new MultiFormatWriter().encode(content, BarcodeFormat.CODE_128, qrWidth, mHeight * 3, hints);
            } catch (IllegalArgumentException iae) {
                return null;
            }
            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) ? BLACK : 0;
                }
            }

            Bitmap qrBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            qrBitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            //大的bitmap
            Bitmap bigBitmap = Bitmap.createBitmap(width, qrHeight, Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bigBitmap);
            Rect srcRect = new Rect(0, 0, width, height);
            Rect dstRect = new Rect(0, 0, width, height);
            canvas.drawBitmap(qrBitmap, srcRect, dstRect, null);
            Paint p = new Paint();
            p.setColor(Color.BLACK);
            p.setFilterBitmap(true);
            //字型大小
            p.setTextSize(mHeight);
           //開始繪製文字的位置
            canvas.translate(width / 10, mHeight);
            canvas.drawText(content, 0, content.length(), 0, height, p);
            return bigBitmap;
        } catch (Exception e) {
            return null;
        }
    }
}