就下面的一个方法就可以:
public static Bitmap zoomImg(Bitmap bm, int newWidth, int newHeight) {
//获得图片的宽高
int width = bm.getWidth();
int height = bm.getHeight();
//计算缩放比例
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
//取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
//得到新的图片
return Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
}
下面是使用方法:
Bitmap bitmap = zoomImg(BitmapFactory.decodeResource(getResources(), R.drawable.icon_gcoding), 70, 100);