Changing Button Color without changing the shape in android

This worked for me - changing at run-time/ dynamically. For example, when the button is clicked, the colour changes, but it's shape needs to stay the same.

First, you need to define in xml the button:

       <Button
            android:id="@+id/myButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/buttonshape"
            android:text="Change Colour but keep shape, please" />

You will see above it calls buttonshape, so in your drawable folder:

(It's a rectangle, grey, with a dark grey border of 1dp)

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#D3D3D3" />
    <corners android:radius="3dp" />

    <stroke
        android:width="1dp"
        android:color="#aeaeae" />
</shape>

Now a new xml file in drawable folder, buttonpressed.xml, for the button pressed state. The colour will be green, everything else the same.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    android:shape="rectangle">
    <solid android:color="#2AB40E" />
    <corners android:radius="3dp" />

    <stroke
        android:width="1dp"
        android:color="#aeaeae" />
</shape>

Now, on button click in our activity:

 private void myButton() {

        myButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

//              keep the slightly rounded shape, when the button is pressed
                myButton.setBackgroundResource(R.drawable.buttonpressed);

etc..etc...

It's an old question, but for future seekers, this worked for me...

In drawable the button shape:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners
        android:bottomRightRadius="10dp"
        android:bottomLeftRadius="10dp"
        android:topRightRadius="10dp"
        android:topLeftRadius="10dp" />
</shape>

In my layout.xml for the button:

<Button
    android:id="@+id/button"
    android:layout_width="150dp"
    android:layout_height="38dp"
    android:layout_marginEnd="20dp"
    android:layout_marginBottom="20dp"
    android:background="@drawable/buttonshape"
    android:backgroundTint="@color/colorButtonOrange"
    android:text="@string/button_text"
    android:textColor="@color/colorWhite"/>

With the android:backgroundTint, the Buttons get an orange Color when the activity is started.

In my Activity, I change the button color with only one line:

button.getBackground().setColorFilter(Color.GREY, PorterDuff.Mode.SRC_ATOP);

I had the same problem when using "setBackgroundColor" was changing the shape of the View. I solved it with "setTint"