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Setting alpha of ColorDrawable does not work

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0

I am trying to achieve an effect in my app of where the user scrolls down, the opacity of a view will change from 0 to 1.

To achieve this, I've created a ColorDrawable with my desired color, blue, and then set its alpha to 0.

val actionBarBackground = ColorDrawable(ContextCompat.getColor(it, R.color.myBlue))
(activity as? AppCompatActivity)?.supportActionBar?.setBackgroundDrawable(actionBarBackground)

However, after increasing the alpha, it does not change. I've tried printing the value of actionBarBackground but its still 0...

// This is called inside a scrollview callback that calculates an alpha value between 0 and 255
actionBarBackground.alpha = 255
Log.d(TAG, "Alpha: $actionBarBackground.alpha") // Prints: Alpha: 0

Any ideas why the alpha of the ColorDwarable does not change? Thank you.

android kotlin alpha colordrawable

share|improve this question

edited Mar 21 at 15:50

Lucas P.

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It might be nice if you add the tag for the language you are using (presumably Kotlin ?). See ColorDrawable setAlpha.
  
  – Jon Goodwin
  Mar 21 at 15:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @JonGoodwin I've added the Kotlin tag. I've read the documentation of multiple times, and the .setAlpha() function does not seem to change the value in the color drawable.
  
  – Lucas P.
  Mar 21 at 15:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See kotlin docs. mutate and invalidateself and setAlpha. This looks WRONG in your questionactionBarBackground.alpha = 255 something like actionBarBackground.setAlpha(255) ?
  
  – Jon Goodwin
  Mar 21 at 16:34
  
  

  
  
  
  

add a comment | 

0

I am trying to achieve an effect in my app of where the user scrolls down, the opacity of a view will change from 0 to 1.

To achieve this, I've created a ColorDrawable with my desired color, blue, and then set its alpha to 0.

val actionBarBackground = ColorDrawable(ContextCompat.getColor(it, R.color.myBlue))
(activity as? AppCompatActivity)?.supportActionBar?.setBackgroundDrawable(actionBarBackground)

However, after increasing the alpha, it does not change. I've tried printing the value of actionBarBackground but its still 0...

// This is called inside a scrollview callback that calculates an alpha value between 0 and 255
actionBarBackground.alpha = 255
Log.d(TAG, "Alpha: $actionBarBackground.alpha") // Prints: Alpha: 0

Any ideas why the alpha of the ColorDwarable does not change? Thank you.

android kotlin alpha colordrawable

share|improve this question

edited Mar 21 at 15:50

Lucas P.

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It might be nice if you add the tag for the language you are using (presumably Kotlin ?). See ColorDrawable setAlpha.
  
  – Jon Goodwin
  Mar 21 at 15:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @JonGoodwin I've added the Kotlin tag. I've read the documentation of multiple times, and the .setAlpha() function does not seem to change the value in the color drawable.
  
  – Lucas P.
  Mar 21 at 15:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See kotlin docs. mutate and invalidateself and setAlpha. This looks WRONG in your questionactionBarBackground.alpha = 255 something like actionBarBackground.setAlpha(255) ?
  
  – Jon Goodwin
  Mar 21 at 16:34
  
  

  
  
  
  

add a comment | 

I am trying to achieve an effect in my app of where the user scrolls down, the opacity of a view will change from 0 to 1.

To achieve this, I've created a ColorDrawable with my desired color, blue, and then set its alpha to 0.

val actionBarBackground = ColorDrawable(ContextCompat.getColor(it, R.color.myBlue))
(activity as? AppCompatActivity)?.supportActionBar?.setBackgroundDrawable(actionBarBackground)

However, after increasing the alpha, it does not change. I've tried printing the value of actionBarBackground but its still 0...

// This is called inside a scrollview callback that calculates an alpha value between 0 and 255
actionBarBackground.alpha = 255
Log.d(TAG, "Alpha: $actionBarBackground.alpha") // Prints: Alpha: 0

Any ideas why the alpha of the ColorDwarable does not change? Thank you.

android kotlin alpha colordrawable

share|improve this question

edited Mar 21 at 15:50

Lucas P.

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

val actionBarBackground = ColorDrawable(ContextCompat.getColor(it, R.color.myBlue))
(activity as? AppCompatActivity)?.supportActionBar?.setBackgroundDrawable(actionBarBackground)

// This is called inside a scrollview callback that calculates an alpha value between 0 and 255
actionBarBackground.alpha = 255
Log.d(TAG, "Alpha: $actionBarBackground.alpha") // Prints: Alpha: 0

android kotlin alpha colordrawable

android kotlin alpha colordrawable

share|improve this question

edited Mar 21 at 15:50

Lucas P.

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

share|improve this question

edited Mar 21 at 15:50

Lucas P.

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221

asked Mar 21 at 15:26

Lucas P.Lucas P.

1,63511221