android图像绘制（二）——放缩问题
android中图像在画布上放大缩小时，图像的边框大小没有改变！
原图如下：
放大后：原来图片的边框没有改变，位置依旧！
所以如果要放置图片的位置的话，就需要做相应的位置移动才可以！
采用如下代码（全屏放置图片）：
[java]
Matrix matrix = new Matrix();
matrix.postScale(canvas.getWidth()*1.01f/bmpBg.getWidth(), canvas.getHeight()*1.01f/bmpBg.getHeight(), bmpBg.getWidth() / 2, bmpBg.getHeight() / 2);
matrix.postTranslate( (canvas.getWidth()-bmpBg.getWidth()) / 2, (canvas.getHeight()-bmpBg.getHeight()) / 2);
canvas.drawBitmap(bmpBg, matrix, paint);
Matrix matrix = new Matrix();
matrix.postScale(canvas.getWidth()*1.01f/bmpBg.getWidth(), canvas.getHeight()*1.01f/bmpBg.getHeight(), bmpBg.getWidth() / 2, bmpBg.getHeight() / 2);
matrix.postTranslate( (canvas.getWidth()-bmpBg.getWidth()) / 2, (canvas.getHeight()-bmpBg.getHeight()) / 2);
canvas.drawBitmap(bmpBg, matrix, paint);
摘自 阿凯的专栏
补充：移动开发 , Android ,
