android中一些bitmap的简单处理
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//根据指定的bitmap路径加载，并定义好了目标的大小 public
static
Bitmap decodeFile(String path, int
dstWidth, int
dstHeight) { Options
options = new
Options(); options.inJustDecodeBounds
= true; BitmapFactory.decodeFile(path,
options); options.inJustDecodeBounds
= false; options.inSampleSize
= calculateSampleSize(options.outWidth, options.outHeight, dstWidth, dstHeight); Bitmap
unscaledBitmap = BitmapFactory.decodeFile(path, options); return
unscaledBitmap; } /** *
获得经过处理的bitmap */ public
static
Bitmap createScaledBitmap(Bitmap unscaledBitmap, int
dstWidth, int
dstHeight) { Rect
srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), dstWidth,
dstHeight); Rect
dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(), dstWidth,
dstHeight); Bitmap
scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(), Config.ARGB_8888); Canvas
canvas = new
Canvas(scaledBitmap); canvas.drawBitmap(unscaledBitmap,
srcRect, dstRect, new
Paint(Paint.FILTER_BITMAP_FLAG)); return
scaledBitmap; } /** *
计算Option的inSampleSize属性 */ public
static
int
calculateSampleSize(int
srcWidth, int
srcHeight, int
dstWidth, int
dstHeight) { final
float
srcAspect = (float)
srcWidth / (float)
srcHeight; final
float
dstAspect = (float)
dstWidth / (float)
dstHeight; if
(srcAspect > dstAspect) { return
srcWidth / dstWidth; }
else
{ return
srcHeight / dstHeight; } } /** *
计算源文件的Rect */ public
static
Rect calculateSrcRect(int
srcWidth, int
srcHeight, int
dstWidth, int
dstHeight) { return
new
Rect(0,
0,
srcWidth, srcHeight); } /** *
计算目标bitmap的rect区域 */ public
static
Rect calculateDstRect(int
srcWidth, int
srcHeight, int
dstWidth, int
dstHeight) { final
float
srcAspect = (float)
srcWidth / (float)
srcHeight; final
float
dstAspect = (float)
dstWidth / (float)
dstHeight; if
(srcAspect > dstAspect) { return
new
Rect(0,
0,
dstWidth, (int)
(dstWidth / srcAspect)); }
else
{ return
new
Rect(0,
0,
(int)
(dstHeight * srcAspect), dstHeight); } }
/** *
View转化为BitMap */ public
static
Bitmap convertViewToBitmap(View view) { view.measure(MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED)); view.layout(0,
0,
view.getMeasuredWidth(), view.getMeasuredHeight()); view.buildDrawingCache(); Bitmap
bitmap = view.getDrawingCache(); return
bitmap; } |
原文：http://blog.csdn.net/u014311064/article/details/42284275