How to setAlpha to android Button

Question

I have three buttons, sharing same background image, i want to disable button one of them by using Alpha.

But when i am using the following code:

 button1.getBackground().setAlpha(45);

it is changing the background for all three buttons. but i need for only one. can we done by using by Alpha()?? or some other things we can use so that button will looks in disabled mode.

Just to check,are you sure that each button has a different ID? — Lumis, Dec 27 '11 at 10:15
Hi Lumis, thanks for response, i have checked, each button have its unique id. — Himanshu, Dec 27 '11 at 10:18
Find it very interesting that one can alter the background for all buttons in this way, thanks for posting this problem. — Lumis, Dec 27 '11 at 10:34

score 20 · Accepted Answer · edited Nov 19 '13 at 07:03

20

You can set alpha using AlphaAnimation to any view

Sample Code

Button btn = (Button) findViewById(R.id.button);  
float alpha = 0.45f;
AlphaAnimation alphaUp = new AlphaAnimation(alpha, alpha);
alphaUp.setFillAfter(true);
btn.startAnimation(alphaUp);

edited Nov 19 '13 at 07:03

rekire

47,260
30
167
264

answered Dec 27 '11 at 10:23

Sunil Kumar Sahoo

53,011
55
178
243

This doesn't work when the user has disabled animations on the device. – Denny Apr 12 '17 at 18:53

Fakhar · Answer 2 · 2015-03-09T13:14:06.533

8

nextBtn.getBackground().setAlpha(100);

or

nextBtn.setAlpha(0.5f);

edited Mar 09 '15 at 13:14

answered Mar 09 '15 at 13:07

Fakhar

3,946
39
35

1

Note, nextBtn.setAlpha(0.5f); setAlpha(int) has been around since API level 1, but is deprecated since level 16. setAlpha(float) continues to work. Consider this: http://stackoverflow.com/questions/21831775/difference-between-setalpha-and-setimagealpha – Brian Bird Oct 11 '16 at 19:19

score 1 · Answer 3 · edited Sep 13 '18 at 03:23

1

In my case I set one button to alpha 75. But all the other buttons with same background color also changed to alpha 75. Calling mutate() solved the problem.

Pavel Dudka' answer works perfectly for my case.

buttonArrivals.getBackground().mutate().setAlpha(180);
buttonDepartures.getBackground().mutate().setAlpha(255);

edited Sep 13 '18 at 03:23

Stephen Rauch

47,830
31
106
135

answered Sep 13 '18 at 03:04

meazuri

73
1
11

score 1 · Answer 4 · answered Dec 27 '11 at 10:17

1

Button btn;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);   
    setContentView(R.layout.main);  
    btn = (Button) findViewById(R.id.main_btn);  
    Drawable d = getResources().getDrawable(R.drawable.imagen);  
    d.setAlpha(60);  
    btn.setBackgroundDrawable(d);  
}

answered Dec 27 '11 at 10:17

NikhilReddy

6,904
11
38
58

`d.setAlpha(60);` requires API level 11+ – Uniruddh Apr 24 '14 at 04:50

How to setAlpha to android Button

4 Answers4

Linked