How do I change the text color of a Button?

Use: android:textColor="#FFFFFF" on the xml configuration,

or on the activity itself by calling

button.setTextColor(0xFFFFFF);

(FFFFFF is the color white).

For more color codes: here

button.setTextColor(ContextCompat.getColor(getApplicationContext(), R.color.red));

this work too

Use the android:textColor property.

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World"
    android:textColor="@android:color/white" />

try this:

button.setTextColor(getApplication().getResources().getColor(R.color.red)); //TAKE DEFAULT COLOR

or

button.setTextColor(0xff0000); //SET CUSTOM COLOR 

or

button.setTextColor(Color.parseColor("#ff0000")); 

and in xml :

<Button android:id="@+id/mybtn" 
        android:text="text textx "  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"  
        android:textStyle="bold" 
        android:textColor="#ff0000" />  <-- SET TEXT COLOR HERE -->