[size=medium]android在处理一写图片资源的时候,会进行一些类型的转换,现在有空整理一下:
1、Drawable → Bitmap[/size]
[size=medium]2、从资源中获取Bitmap[/size]
[size=medium]3、Bitmap → byte[][/size]
[size=medium]4、 byte[] → Bitmap[/size]
[size=medium]5、resource -> BitmapDrawable, Bitmap[/size]
[size=medium]转自:[url]http://www.iteye.com/topic/642128[/url][/size]
1、Drawable → Bitmap[/size]
public static Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
//canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
[size=medium]2、从资源中获取Bitmap[/size]
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
[size=medium]3、Bitmap → byte[][/size]
private byte[] Bitmap2Bytes(Bitmap bm){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
[size=medium]4、 byte[] → Bitmap[/size]
private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
} else {
return null;
}
}
[size=medium]5、resource -> BitmapDrawable, Bitmap[/size]
Resources r = this.getContext().getResources();
InputStream is = r.openRawResource(R.drawable.my_background_image);
BitmapDrawable bmpDraw = new BitmapDrawable(is);
Bitmap bmp = bmpDraw.getBitmap();
//或者以下方式
//BitmapDrawable dra = getResources().getDrawable(R.drawable.my_background_image);
//Bitmap bmp = dra.getBitmap();
[size=medium]转自:[url]http://www.iteye.com/topic/642128[/url][/size]