bitmap+文本生成新的bitmap的实现

　　

注：参数content为生成二维码bitmap的内容，该二维码bitmap在和文本title组合生成一个新的bitmap

 

package info.ecloud.merchant.util;

import android.graphics.bitmap;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.rect;

import com.google.zxing.barcodeformat;
import com.google.zxing.encodehinttype;
import com.google.zxing.qrcode.decoder.errorcorrectionlevel;
import com.journeyapps.barcodescanner.barcodeencoder;

import java.util.hashtable;



public class saveimageutils {

    private static final string charset = "utf-8";
    /**
     * 生成图片  加上title的图片
     * @param content
     * @param title
     * @return
     */
    public static bitmap createimage(string content,string title) {
        int picwidth = 520;//生成图片的宽度
        int picheight = 565;//生成图片的高度
        int titletextsize = 25;
        int textcolor = color.black;
        int qrwidth = 370;
        int qrheight = 370;
        int paddingtop = 5;
        int paddingmiddle = 20;
        int paddingbottom = 20;

        //最终生成的图片
        bitmap result = bitmap.createbitmap(picwidth,picheight,bitmap.config.argb_8888);

        paint paint = new paint();
        paint.setcolor(color.white);
        canvas canvas = new canvas(result);

        //先画一整块白色矩形块
        canvas.drawrect(0,0,picwidth,picheight,paint);

        //画title文字
        rect bounds = new rect();
        paint.setcolor(textcolor);
        paint.settextsize(titletextsize);
        //获取文字的字宽高，以便将文字与图片中心对齐
        paint.gettextbounds(title,0,title.length(),bounds);
        //画白色矩形块
        int qrtop = paddingtop+titletextsize+paddingmiddle;//二维码的顶部高度

        //画二维码
        hashtable<encodehinttype, object> hints = new hashtable<>();
        hints.put(encodehinttype.error_correction, errorcorrectionlevel.h);
        hints.put(encodehinttype.character_set, charset);
        hints.put(encodehinttype.margin, 5);
        bitmap image = null;
        try {
            barcodeencoder barcodeencoder = new barcodeencoder();
            image = barcodeencoder.encodebitmap((string) content, barcodeformat.qr_code, 400, 400);
        } catch (exception e) {
            e.printstacktrace();
        }

        paint.setcolor(color.black);
        canvas.drawbitmap(image,(picwidth-qrwidth)/2,qrtop,paint);

        //画文字
        paint.setcolor(color.black);
        paint.settextsize(titletextsize);
        int line = 3;
        int texttop = qrtop+qrheight+paddingbottom;//地址的顶部高度

        for (int i = 0 ; i < line ; i++){
            string[] split = title.split("-");
            paint.gettextbounds(title,0,split[i].length(),bounds);
            canvas.drawtext(split[i],picwidth/2-bounds.width()/2,texttop+i*titletextsize+i*5+bounds.height()/2,paint);
        }

        canvas.save();
        canvas.restore();

        return result;
    }


}