Set transparent background of an imageview on Android

Question

I am using a web view in which I am adding an image view  How can I set the background of this image view to transparent   I have tried this   mImageview setBackgroundResource R color trans     Where trans    lt color name  trans  gt  00000000  lt  color gt

User · Answer

You could also use View setAlpha float  to change the visibility precisely   0 would be transparent  1 fully visible

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If you use a drawable XML image you can make it transparent as shown in the picture below  or you can use a color code    lt color name  black  gt  99000000 lt  color gt

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Try to use the following code  It will help you in full or more    A  xml file designed to use this code to set background color   android background   000000    or  android background   FFFFFF      Or you can set it programmatically as well  Also you can use this code programmatically   image setBackgroundDrawable getResources   getDrawable      R drawable llabackground     Also this code for setting the background color as well programmatically   image setBackgroundColor Color parseColor   FFFFFF      This code for the same programmatically   image setBackgroundColor getResources   getColor Color WHITE       The color depends on your choice of which color you want to use for transparent  Mostly use a white or  FFFFFF color   Regarding R drawable llabackground  This line of code is for your style of the background  like something special or different for your purpose  You can also use this

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use RelativeLayout which has 2 imageViews in   and set transparency code on the top imageView  transparency code     lt solid android color  quot  color white quot   gt   lt gradient android startColor  quot  40000000 quot    android endColor  quot  FFFFFFFF quot  android angle  quot 270 quot   gt

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In addition to what Harshad mentioned   Two hexadecimal characters can be appended to any hexadecimal color code  The first two characters in an 8-digit hex color code represents its opacity in Android   The two hexadecimal characters can range from 00 to FF  For example    Normal opaque black hex-   000000  Fully transparent -   00000000  Fully opaque -   FF000000  50  transparent -   7F000000    This way you can change any color to any level of transparency   To find the hexadecimal prefix from a percentage   Divide the percentage number by 100 and multiply by 255 to get the decimal value  Convert the decimal to hexadecimal here   For example  for 50   50 100   255   127  Using the link we get hexadecimal value 7F   Source  Android  how to create a transparent or opaque background

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Color definitions with transparency information may be in the form   AARRGGBB or  ARGB   You can use also the shorter value for full transparency     0000   Other values are e g    white  grey   black  FFFF   F888   F000 - full color  EFFF   E888   E000  DFFF   D888   D000  CFFF   C888   C000  BFFF   B888   B000  AFFF   A888   A000  9FFF   9888   9000  8FFF   8888   8000  7FFF   7888   7000  6FFF   6888   6000  5FFF   5888   5000  4FFF   4888   4000  3FFF   3888   3000  2FFF   2888   2000  1FFF   1888   1000  0FFF   0888   0000 - full transparency

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Try this code      Its an fully transparent hexa code -   00000000

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There is already a transparent built into Android  R color transparent  http   developer android com reference android R color html transparent  But I think you may want to make the background of the image that you are placing into the WebView transparent  for example  with a transparent PNG  rather than the ImageView background  If the actual image is not at all see-through then the ImageView background can t be seen through it

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There is already a predefined constant  Use Color TRANSPARENT

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ImageView setBackground R drawable my background    ImageView setBackgroundResource R color colorPrimary    ImageView getImageAlpha     ImageView setAlpha 125      transparency

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Use the following for complete transparency    00000000   When I tried with  80000000 I got a black transparent overlay which I don t want  Try to change the first two digits  it controls the level of transparency  like   00000000  10000000  20000000  30000000

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For those who are still facing this problem  you may try this element getBackground   setAlpha 0

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In xml  android color transparent  In code mComponentName setBackgroundResource android R color transparent

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In your XML set the Background attribute to any colour  White  FFFFFF  shade or Black  000000  shade  If you want transparency  just put 80 before the actual hash code    80000000   This will change any colour you want to a transparent one

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One more simple way   mComponentName setBackgroundResource android R color transparent

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In your XML file  set an attribute  Alpha   such as   android alpha  0 0     for transparent android alpha  1 0     for opaque   You can give any value between 0 0 to 1 0 in decimal to apply the required transparency  For example  0 5 transparency is ideal for disabled component

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In case you want it in code  just   mComponentName setBackgroundColor Color parseColor   80000000

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Try this    aa000000   For transparency 000000   black  you can change these six numbers for the color you want

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Another working option I came across is to set android background   null

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Or  as an alternate  parse the resource ID with the following code     mComponentName setBackgroundColor getResources   getColor android R color transparent

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If you want to add 20  or 30  transparency  you should pre-pend two more characters to the hexadecimal code  like CC  Note android background  quot  CCFF0088 quot  in XML where CC is the alpha value  FF is the red factor  00 is the green factor  and 88 is the blue factor  Some opacity code  Hex Opacity Values 100      FF 95      F2 90      E6 85      D9 80      CC 75      BF 70      B3 65      A6 60      99 55      8C 50      80 45      73 40      66 35      59 30      4D 25      40 20      33 15      26 10      1A 5       0D 0       00  You can also set opacity programmatically like  yourView getBackground   setAlpha 127    Set opacity between 0  fully transparent  to 255  completely opaque   The 127 5 is exactly 50   You can create any level of transparency using the given formula  If you want half transparent   16  128          Where 128 is the half of 256       8 -0         So it means 80 is half transparent   And for 25  transparency  16  64            Where 64 is the quarter of 256      4 -0          So it means 40 is quarter transparent

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Use the below code for black   lt color name  quot black quot  gt  000000 lt  color gt   Now if you want to use opacity then you can use the below code   lt color name  quot black quot  gt  99000000 lt  color gt   And the below for opacity code  100      FF 95      F2 90      E6 85      D9 80      CC 75      BF 70      B3 65      A6 60      99 55      8C 50      80 45      73 40      66 35      59 30      4D 25      40 20      33 15      26 10      1A 5      0D 0      00

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In Android Studio it is very simple to adjust color and opacity using a built-in tool

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You can set the background transparent of any layout  any view  or any component by adding this code in XML   android background   android color transparent

[android] Set transparent background of an imageview on Android

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