How can I make an image transparent on Android?

Question

I am using a linear layout and frame layout. In the linear layout I keep an image as background and in the frame layout I keep an imageView. In that imageView I give an image.

Answer 1

Try this:

ImageView myImage = (ImageView) findViewById(R.id.myImage);
myImage.setAlpha(127); //value: [0-255]. Where 0 is fully transparent and 255 is fully opaque.

Note: setAlpha(int) is deprecated in favor of setAlpha(float) where 0 is fully transparent and 1 is fully opaque. Use it like: myImage.setAlpha(0.5f)

Answer 2

Set transparency using setAlpha(float alpha). The below code works for me were I used an alpha value in float, 0 - 1.

• 0: Full Transparent
• 0.5 - 50%: Transparent

• 1: Full Opaque

  ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView); imageView.setImageResource(mResources[position]); imageView.setAlpha(.80f);

Answer 3

In XML, use:

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

Answer 4

On newer versions of Android (post Android 4.2 (Jelly Bean) at least), the setAlpha(int value) method is depreciated. Instead, use the setAlpha(float value) method that takes a float between 0 and 1 where 0 is complete transparency and 1 is no transparency.

Answer 5

If you are in an XML file, use the following to make your imageview transparent!

 android:background="@null" 

Answer 6

For 20% transparency, this worked for me:

Button bu = (Button)findViewById(R.id.button1);
bu.getBackground().setAlpha(204);