How to grey out a button?

Question

I have a button defined as shown below. When I want to disable it I use my_btn.setEnabled(false), but I would also like to grey it out. How can I do that?

Thanks

<Button android:id="@+id/buy_btn" style="@style/srp_button" />

style/srp_button

<style name="srp_button" parent="@android:style/Widget.Button">
    <item name="android:background">@drawable/btn_default</item>
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:textColor">#ffffff</item>
    <item name="android:textSize">14sp</item>
    <item name="android:typeface">serif</item>
    <item name="android:paddingLeft">30dp</item>
    <item name="android:paddingRight">30dp</item>
    <item name="android:paddingTop">5dp</item>
    <item name="android:paddingBottom">5dp</item>
</style>

drawable/btn_default.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@color/pink" />
    <corners android:radius="6dp" />
</shape>

Answer 1

You could Also make it appear as disabled by setting the alpha (making it semi-transparent). This is especially useful if your button background is an image, and you don't want to create states for it.

button.setAlpha(.5f);
button.setClickable(false);

Answer 2

I used this code for that:

ColorMatrix matrix = new ColorMatrix();
matrix.setSaturation(0);
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
profilePicture.setColorFilter(filter);

Answer 3

Button button = (Button)findViewById(R.id.buy_btn);
button.setEnabled(false);