How can I detect empty area in bitmap.
in the imageView there is a bitmap. I get it use getbitmap() method. it is .png format and one part of image is empty.
Is there any way to detect that area?
答案 0 :(得分：0)
Consider your Undefined symbols for architecture x86_64:
"_ACAccountTypeIdentifierTwitter", referenced from:
-[PF_Twitter _getLocalTwitterAccountAsync] in ParseTwitterUtils(PF_Twitter.o)
"_FBTokenInformationExpirationDateKey", referenced from:
-[PFFacebookTokenCachingStrategy cacheTokenInformation:] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy expirationDate] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setExpirationDate:] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationTokenKey", referenced from:
-[PFFacebookTokenCachingStrategy accessToken] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setAccessToken:] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationUserFBIDKey", referenced from:
-[PFFacebookTokenCachingStrategy facebookId] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setFacebookId:] in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
"_OBJC_CLASS_$_ACAccountStore", referenced from:
objc-class-ref in ParseTwitterUtils(PF_Twitter.o)
"_OBJC_CLASS_$_FBAppCall", referenced from:
objc-class-ref in ParseFacebookUtils(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBRequest", referenced from:
objc-class-ref in ParseFacebookUtils(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSDKAccessToken", referenced from:
objc-class-ref in ParseFacebookUtilsV4(PFFacebookPrivateUtilities.o)
objc-class-ref in ParseFacebookUtilsV4(PFFacebookAuthenticationProvider.o)
objc-class-ref in ParseFacebookUtilsV4(PFFacebookUtils.o)
"_OBJC_CLASS_$_FBSDKApplicationDelegate", referenced from:
objc-class-ref in ParseFacebookUtilsV4(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSDKLoginManager", referenced from:
objc-class-ref in ParseFacebookUtilsV4(PFFacebookMobileAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSDKSettings", referenced from:
objc-class-ref in ParseFacebookUtilsV4(PFFacebookPrivateUtilities.o)
"_OBJC_CLASS_$_FBSession", referenced from:
objc-class-ref in ParseFacebookUtils(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_CLASS_$_PFFacebookTokenCachingStrategy in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
"_OBJC_METACLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_METACLASS_$_PFFacebookTokenCachingStrategy in ParseFacebookUtils(PFFacebookTokenCachingStrategy.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
as Bitmap
bitmapIf int color = bitmap.getPixel((int) event.getX(),(int) event.getY());
, It is color = 0.
else It is transparent.
答案 1 :(得分：0)
l1 = [i for i in l1 if i <= x]
l1.append(x)
l2 = [i for i in l2 if i >= x]
l2.insert(0, x)
This should give you the level of Bitmap bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
int transparency = ((bitmap.getPixel(x,y) & 0xff000000) >> 24);
of the pixel in transparency.
The value of coordinates(x,y) will be between transparency and 0, when 255 is completely transparent and 0 is completely opaque.