Transparent part of image in ImageView become black

问题:

I have problem when displaying image with transparency in Android KitKat (Nexus 7), it is OK in nexus 4 (KitKat) and other previous Android OS, here the image:

and ImageView layout:

and here the screenshot when running on Nexus 7 (Android 4.4)

also, I use Picasso for download & caching image from the URL.

回答1:

After some trial: first I try using the image as resource drawable and it still happen (transparent part of the image become black), secondly I convert the image to png image and it is work, so the problem is in the file type (gif). since in my real app the image obtained from server and I can't request image as always in png format, I use the solution from this link: Transparent GIF in Android ImageView

it is simple for displaying only one image (like in my question) since I use Picasso I use target to erase black color from image avatar like this:

target = new Target() {          @Override public void onPrepareLoad(Drawable arg0) {  }  @Override public void onBitmapLoaded(Bitmap bitmap, LoadedFrom arg1) {     if (Build.VERSION.SDK_INT == 19/*Build.VERSION_CODES.KITKAT*/){         Bitmap editedavatar = AndroidUtils.eraseColor(bitmap, -16777216);         avatar.setImageBitmap(editedavatar);     } }  @Override public void onBitmapFailed(Drawable arg0) {     avatar.setImageResource(R.drawable.ic_profile_default); 

where erase color is static method

public static Bitmap eraseColor(Bitmap src, int color) {     int width = src.getWidth();     int height = src.getHeight();     Bitmap b = src.copy(Config.ARGB_8888, true);     b.setHasAlpha(true);      int[] pixels = new int[width * height];     src.getPixels(pixels, 0, width, 0, 0, width, height);      for (int i = 0; i 

but since I use Picasso for displaying images in a listview,I impelements Target in ViewHolder and it is work very well so far.

回答2:

Try this 

回答3:

Try this :

android:background="@android:color/transparent" 

or

imageView.setBackgroundColor(Color.TRANSPARENT); 

Hope this helps.

文章来源: Transparent part of image in ImageView become black