How can I change the colour of my button linked to a drawable?

Issue

I have this Button in my Relative Layout:

<Button
        android:id="@+id/gpsButton"
        android:layout_width="50sp"
        android:layout_height="50sp"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@+id/tableLayout1"
        android:background="@drawable/round_button"
        android:gravity="center_vertical|center_horizontal"
        android:text="GPS"
        android:textColor="#ffffff" />

It is linked to this shade:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#FF0000"/>
    <stroke android:width="2sp" android:color="#fff" />
</shape>

My question is how can I change the colour from the button in my activity?

I've tried it but the app crashed -.- Here is a snippet of my code:

RelativeLayout relLayout = (RelativeLayout) findViewById(R.id.reli);
                        GradientDrawable bgShape = (GradientDrawable) relLayout.getBackground();
                        bgShape.setColor(Color.parseColor("#FFFF00"));

What do I wrong? I don't understand how to do this with the view.

Thank you in advance :)

Solution

You can easily change the background color of your Button programatically by adding a color filter. For that, set a white background in the XML file. Then, to make the button red, you can do this:

gpsButton.getBackground().setColorFilter(Color.RED, Mode.MULTIPLY);

The red and white will be multiplied which will result as red. Of course, you can replace the Color.RED by the color you want.

Answered By - G.T.