Android Set Button Background Programmatically

Programmatically change button background drawable onClick

private boolean isButtonClicked = false; // You should add a boolean flag to record the button on/off state

protected void onCreate(Bundle savedInstanceState) {
    ......
    Button star = (Button) findViewById(R.id.buttonStar);
    star.setOnClickListener(new OnClickListener() { // Then you should add add click listener for your button.
        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.buttonStar) {
                isButtonClicked = !isButtonClicked; // toggle the boolean flag
                v.setBackgroundResource(isButtonClicked ? R.drawable.btn_star_on : R.drawable.btn_star_off);
            }
        }
    });
}

android set button background programmatically

R.color.red is an ID (which is also an int), but is not a color.

Use one of the following instead:

// If you're in an activity:
Button11.setBackgroundColor(getResources().getColor(R.color.red));
// OR, if you're not: 
Button11.setBackgroundColor(Button11.getContext().getResources().getColor(R.color.red));

Or, alternatively:

Button11.setBackgroundColor(Color.RED); // From android.graphics.Color

Or, for more pro skills:

Button11.setBackgroundColor(0xFFFF0000); // 0xAARRGGBB

Android: change button background programmatically

You could use an xml file like one below, to create states for your button.

The info about attributes available is here.
You simply copy this xml file to your drawables folder in your project, name it for example custom_button.xml, and reference it in your layout with

android:background="@drawable/custom_button"

Here is xml file...

<?xml version="1.0" encoding="utf-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true" >
    <shape android:shape="rectangle">
        <solid
            android:color="#00ff00" />
        <stroke
            android:width="5dp"
            android:color="#ff0000"
            android:dashWidth="3dp"
            android:dashGap="2dp" />
    </shape>
</item>

<item android:state_focused="true" >
    <shape>
        <gradient
            android:endColor="#ffffff"
            android:centerColor="#ffffff"
            android:startColor="#ffffff"
            android:angle="270" />
        <stroke
            android:width="3dp"
            android:color="#00ff00" />
        <corners
            android:radius="5dp" />
        <padding
            android:left="10dp"
            android:top="10dp"
            android:right="10dp"
            android:bottom="10dp" />
    </shape>
</item>

<item>        
    <shape>
        <gradient
            android:endColor="#ffffff"
            android:centerColor="#ffffff"
            android:startColor="#ffffff"
            android:angle="270" />
        <stroke
            android:width="5dp"
            android:color="#00ff00" />
        <corners
            android:radius="5dp" />
    </shape>
</item>

Change oval shaped button background programmatically

You could modify it using this simple method down below

GradientDrawable BackgroundShape = (GradientDrawable)btn.getBackground();
BackgroundShape.setColor(Color.BLACK);

Setting Custom-Theme to Button-Background programmatically

In case someone faces the same problem, I found another question which gave me the hint: https://stackoverflow.com/a/53884954/7671760

Using typeArry buttonDraw I saved the default button theme in onCreate -->
buttonDraw = getTheme().obtainStyledAttributes(new int[]{R.attr.button});

then changed my resetColor() to:

buttonA2.setBackground(getResources().getDrawable(buttonDraw.getResourceId(0, 1)));
buttonB2.setBackground(getResources().getDrawable(buttonDraw.getResourceId(0, 1)));
buttonC2.setBackground(getResources().getDrawable(buttonDraw.getResourceId(0, 1)));
buttonD2.setBackground(getResources().getDrawable(buttonDraw.getResourceId(0, 1)));

Don't know if that's the smartest way, but it worked for me.

Cheers!

How to add button tint programmatically

According to the documentation the related method to android:backgroundTint is setBackgroundTintList(ColorStateList list)

Update

Follow this link to know how create a Color State List Resource.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:color="#your_color_here" />
</selector>

then load it using

setBackgroundTintList(contextInstance.getResources().getColorStateList(R.color.your_xml_name));

where contextInstance is an instance of a Context

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using AppCompart

btnTag.setSupportButtonTintList(ContextCompat.getColorStateList(Activity.this, R.color.colorPrimary));

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