Android 手机应用的开发经验—QR生成器

核心提示：);}}}//解锁并绘图mSurfaceHolder01.unlockCanvasAndPost(mCanvas01);}//在SurfaceView上绘制QRCode条形码private void drawQRCode(boolean[][] bRect, int colorFill){/* test Canvas*

);

}

}

}

//解锁并绘图

mSurfaceHolder01.unlockCanvasAndPost(mCanvas01);

}

//在SurfaceView上绘制QRCode条形码

private void drawQRCode(boolean[][] bRect, int colorFill)

{

/* test Canvas*/

int intPadding = 20;

//绘图前先锁定Surfaceholder

Canvas mCanvas01 = mSurfaceHolder01.lockCanvas();

//设置画图绘图颜色

mCanvas01.drawColor(getResources().getColor(R.drawable.white));

//创建画笔

Paint mPaint01 = new Paint();

//设置画笔颜色和模式

mPaint01.setStyle(Paint.Style.FILL);

mPaint01.setColor(colorFill);

mPaint01.setStrokeWidth(1.0F);

//逐一加载boolean数组

for (int i=0;i
< p>

{

for (int j=0;j
< p>

{

if (bRect[j][i])

{

//绘出条形码方块

mCanvas01.drawRect

(

new Rect

(

intPadding+j*3+2,//左上边x

intPadding+i*3+2,//左上边y

intPadding+j*3+2+3,//右下边x

intPadding+i*3+2+3//右下边y

), mPaint01

);

}

}

}

//解锁并绘图

mSurfaceHolder01.unlockCanvasAndPost(mCanvas01);

}

代码片段中用到的boolean数组就是从AndroidQREncode()函数中得到的。

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Canvas和Bitmap绘图

Canvas可以用来显示位图，可是Canvas画图本身位图没有关系，不过可以把Canvas和Bitmap联系起来，这样图像保存时候就大有用途了。你还记得这两行代码吗：

canvasBmp = Bitmap.createBitmap(w, h, Config.ARGB_8888);//创建可改变的Bitmat对象

Canvas cn = new Canvas(canvasBmp);//创建Canvas对象