Android Layout background alpha

Question

Hi I have a layout which I\'m using to fill my page and I have to set a background image held in my drawable folder in that layout.

I want to then set the <

Answer 1

You Can Set Alpha for Drawables not Views ! You Can get background as a drawable and do like this :

View backgroundimage = (View) findViewById(R.id.background);
backgroundimage.getBackground().setAlpha(80);

Answer 2

Try to use:

Drawable.setAlpha();

You should do something like this:

View backgroundImage = findViewById(R.id.background);
Drawable background = backgroundImage.getBackground();
background.setAlpha(80);

Answer 3

If you want to set alpha in xml then u can try this:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#CC000000" >

first 2 digits are used to set alpha here alpha is 80% next 6 digits for color code

Hence, alpha is set in hexadecimal coding. FF = 100% and 00 = 0%, thus 80% is not 80 in hexadecimal, for more standard values see this post.

Answer 4

Use This on your LinearLayout

android:background="#92000000"