Android中Bitmap和Drawable(转)
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代码
- public
byte[] Bitmap2Bytes(Bitmap bm) { -
ByteArrayOutputStream baos = new ByteArrayOutputStream(); -
bm.compress(Bitmap.CompressFormat.PNG, 100, baos); -
return baos.toByteArray(); - }
3、byte[] → Bitmap
Java代码
- public
Bitmap Bytes2Bimap(byte[] b) { -
if (b.length != 0) { -
return BitmapFactory.decodeByteArray(b, 0, b.length); -
} else { -
return null; -
} - }
4、Bitmap缩放
Java代码
- public
static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) { -
int w = bitmap.getWidth(); -
int h = bitmap.getHeight(); -
Matrix matrix = new Matrix(); -
float scaleWidth = ((float) width / w); -
float scaleHeight = ((float) height / h); -
matrix.postScale(scaleWidth, scaleHeight); -
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true); -
return newbmp; - }
5、将Drawable转化为Bitmap
Java代码
- public
static Bitmap drawableToBitmap(Drawable drawable) { -
// 取 drawable 的长宽 -
int w = drawable.getIntrinsicWidth(); -
int h = drawable.getIntrinsicHeight(); -
-
// 取 drawable 的颜色格式 -
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 -
: Bitmap.Config.RGB_565; -
// 建立对应 bitmap -
Bitmap bitmap = Bitmap.createBitmap(w, h, config); -
// 建立对应 bitmap 的画布 -
Canvas canvas = new Canvas(bitmap); -
drawable.setBounds(0, 0, w, h); -
// 把 drawable 内容画到画布中 -
drawable.draw(canvas); -
return bitmap; -
}
6、获得圆角图片
Java代码
- public
static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) { -
int w = bitmap.getWidth(); -
int h = bitmap.getHeight(); -
Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888); -
Canvas canvas = new Canvas(output); -
final int color = 0xff424242; -
final Paint paint = new Paint(); -
final Rect rect = new Rect(0, 0, w, h); -
final RectF rectF = new RectF(rect); -
paint.setAntiAlias(true); -
canvas.drawARGB(0, 0, 0, 0); -
paint.setColor(color); -
canvas.drawRoundRect(rectF, roundPx, roundPx, paint); -
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); -
canvas.drawBitmap(bitmap, rect, rect, paint); -
-
return output; - }
7、获得带倒影的图片
Java代码
- public
static Bitmap createReflectionImageWit hOrigin(Bitmap bitmap) { -
final int reflectionGap = 4; -
int w = bitmap.getWidth(); -
int h = bitmap.getHeight(); -
-
Matrix matrix = new Matrix(); -
matrix.preScale(1, -1); -
-
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, h / 2, w, -
h / 2, matrix, false); -
-
Bitmap bitmapWithReflection = Bitmap.createBitmap(w, (h + h / 2), -
Config.ARGB_8888); -
-
Canvas canvas = new Canvas(bitmapWithReflection); -
canvas.drawBitmap(bitmap, 0, 0, null); -
Paint deafalutPaint = new Paint(); -
canvas.drawRect(0, h, w, h + reflectionGap, deafalutPaint); -
-
canvas.drawBitmap(reflectionImage, 0, h + reflectionGap, null); -
-
Paint paint = new Paint(); -
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, -
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, -
0x00ffffff, TileMode.CLAMP); -
paint.setShader(shader); -
// Set the Transfer mode to be porter duff and destination in -
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); -
// Draw a rectangle using the paint with our linear gradient -
canvas.drawRect(0, h, w, bitmapWithReflection.getHeight() -
+ reflectionGap, paint); -
-
return bitmapWithReflection; - }
三、Drawable
1、Bitmap转换成Drawable
Java代码
- Bitmap
bm=xxx; //xxx根据你的情况获取 - BitmapDrawable
bd= new BitmapDrawable(getResource(), bm); - 因为BtimapDrawable是Drawable的子类,最终直接使用bd对象即可。
2、Drawable缩放
Java代码
- public
static Drawable zoomDrawable(Drawable drawable, int w, int h) { -
int width = drawable.getIntrinsicWidth(); -
int height = drawable.getIntrinsicHeight(); -
// drawable转换成bitmap -
Bitmap oldbmp = drawableToBitmap(drawable); -
// 创建操作图片用的Matrix对象 -
Matrix matrix = new Matrix(); -
// 计算缩放比例 -
float sx = ((float) w / width); -
float sy = ((float) h / height); -
// 设置缩放比例 -
matrix.postScale(sx, sy); -
// 建立新的bitmap,其内容是对原bitmap的缩放后的图 -
Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height, -
matrix, true); -
return new BitmapDrawable(newbmp); - }
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