Button.setBackground(Drawable background) throws NoSuchMethodError

Question

I\'m implementing a simple method to add a Button to a LinearLayout programatically.

When I invoke the setBackground(Drawable background) metho

Answer 1

            <Button
                android:id="@+id/btnregister"
                android:layout_width="150dp"
                android:layout_height="45dp"
                android:layout_gravity="center"
                android:layout_marginHorizontal="10dp"
                android:layout_marginVertical="20dp"
                android:paddingVertical="5dp"
                style="@style/btn_register"
                android:text="Register"
                android:textColor="#FFFFFF" />

apply below code in Styles.xml file :

 <style name="btn_register">
        <item name="android:layout_marginTop">15dp</item>
        <item name="android:backgroundTint">#009688</item>
        <item name="cornerRadius">20dp</item>
    </style>

Answer 2

You might be testing on an API below level 16 (Jelly Bean).

The setBackground method is only available from that API level onwards.

I would try with setBackgroundDrawable (deprecated) or setBackgroundResource if that's the case.

For instance:

Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
Button one = new Button(this);
// mediocre
one.setBackgroundDrawable(d);
Button two = new Button(this);
// better
two.setBackgroundResource(R.drawable.ic_launcher);

Answer 3

To create a homogeneous background for a View, you can create a drawable resource of type shape, and use that with the setBackgroundResource.

red_background.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> 
    <solid android:color="#FF0000"/>    
</shape>

Activity:

Button b = (Button)findViewById(R.id.myButton);
b.setBackgroundResource(R.drawable.red_background);

But this will look pretty bad, flat and out of place. If you want a colored button that looks like a button, than you can either design it yourself (rounded corners, stroke, gradient fill...) or a fast and dirty solution is to add a PorterDuff filter to the button's background:

Button b = (Button)findViewById(R.id.myButton);
PorterDuffColorFilter redFilter = new PorterDuffColorFilter(Color.RED, PorterDuff.Mode.MULTIPLY);
b.getBackground().setColorFilter(redFilter);

Answer 4

Since after Android 16 , the setBackgroundDrawable is deprecated, I suggested to checked before set code

you need to check current version of Android also

Button bProfile; // your Button
Bitmap bitmap; // your bitmap

if(android.os.Build.VERSION.SDK_INT < 16) {
    bProfile.setBackgroundDrawable(new BitmapDrawable(getResources(), bitmap));
}
else {
    bProfile.setBackground(new BitmapDrawable(getResources(),bitmap));
}

Answer 5

You can't use setBackground(). This method may be not available in your Android level.