Develop Reference

Android Button changing color and incrementing size

Hi guys im new in android stuff and i have a problem with a button when color change, because when it changes the button grows a bit and i dont know why. My code of the button click is below.
produzirbt.setBackgroundColor(Color.rgb(38, 198, 219));
Toast.makeText(getApplicationContext(), "Avaria iniciada.", Toast.LENGTH_SHORT).show();
Xml
<Button
android:layout_width="150dp"
android:layout_height="100dp"
android:text="Pausa"
android:id="#+id/Pausa"
android:textSize="50px"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_above="#+id/Avaria"
android:layout_toRightOf="#+id/terminaliniciado"
android:layout_toEndOf="#+id/terminaliniciado" />

In order to keep button size use setColorFilter() method.
In your case:
produzirbt.getBackground().setColorFilter(ContextCompat.getColor(this, R.color.your_color), PorterDuff.Mode.SRC_ATOP);

Your button by default has a backgrond definded by some xml file. It contains backround color, corner radiuses and padding. Then in java code you change this style to plain color and padding becomes zero. To prevent size changing you should define base background with a color. Like this:
<Button
android:layout_width="150dp"
android:layout_height="100dp"
android:text="Pausa"
android:id="#+id/Pausa"
android:textSize="32sp"
android:background="#color/my_button_color"
android:layout_above="#+id/Avaria"
android:layout_toRightOf="#+id/terminaliniciado"
android:layout_toEndOf="#+id/terminaliniciado" />
A the same time using color for button is a hacky method. It'll be better to define normal style as the documentation says.

Button with image: remove background color

I'd like to have an image in a button with text and I've already have it. But the problem is that my image is with some " grey background colour" (as you can see below) that I would like to remove.
In a normal situation I would use android:background="#null" and it would solve it, but I'm using as background a template to my button.
<Button
android:drawableLeft="#drawable/profile_32"
android:layout_marginRight="25dp"
android:layout_marginBottom="10dp"
android:textColor="#color/yellow3"
android:background="#drawable/buttons2"
android:layout_width="match_parent"
android:layout_height="60dp"
android:text="#string/button_profile"
android:textSize="18dp"
android:textStyle="bold"
android:id="#+id/buttonProfile"
/>
Does anyone know any other way to remove that grey background color from the image? Thanks.

Is the grey actually part of the image? If not you could try background:"#android:color/transparent"

If the grey background is part of the profile_32 image, there is not an easy way to remove it in Android. You will need to have the image re-exported or use an image editing program to remove the background.

Yes, use an ImageButton and just add
android:background="#00000000"
or
android:background="#null"
to your Button.
The first 2 "0" is alpha, "00" = trasparent

Background of my custom button isn't transparent

I created a custom button and I saved it as a .png with a transparant background.
this is the code in xml
<Button
android:id="#+id/btnReport"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:drawableTop="#drawable/report" />
and when i run it in the emulator I get my button with a grey background
(I cannot post images yet, because my reputation is too low. Apologies for this)
How do I make the background transparant?
Thanks.
Vincent

You should be doing
android:background="#drawable/report"

is that image "report" only transparent? You don´t need to set a transparent image, just set
android:background="#android:color/transparent"
to your button.

Text color of selected button android

I have a button like so:
<Button
android:id="#+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
android:text="Button"
android:textColor="#color/my_gray" />
After pressing the button, the text color turns a darker gray color (a "this has already been pressed" color). How do I prevent this? On the button press I do button.setTextColor(R.color.my_gray); to reset the color, but it has no effect.

Try using a different kind of button. CompoundButton or ImageButton might work out for you since you can control their backgrounds/images more easily.
However, the best way to do it might be to use a selector like this guide shows.

How to make a button non-transparent in Android?

when I just use the normal default button in android, depending on what colour the background of the intent is the colour of the button changes slightly to the colour of the background. I want it so that the button is fully opaque (like when the intent has a white background), how do I do this? thanks.
[it might only do it in android 3.1]
the same button on different backgrounds

You can set the background for a button to any drawable. In XML, do it using the android:background attribute:
<Button
. . .
android:background="#drawable/my_button_bg"
. . .
/>
In code, use the setBackgroundResource method:
Button button = (Button) findViewById(R.id.my_button);
button.setBackgroundResource(R.drawable.my_button_bg);
Your background drawable can be a State List drawable, which you can use to change the background appearance when the button is pressed, has focus, etc.

<Button android:background="#android:color/transparent"
android:text="#+id/Button01"
android:id="#+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffffff" />
By using android:background="#android:color/transparent" the button background will become transparent