Solution 1:

Adding a drawable to a button has very limited functions. You can’t change the drawable size, so the best way to fix it is to add a button with an image view beside it in a linear layout like this:

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:background="@drawable/ronaldo"
    android:orientation="horizontal">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:layout_marginEnd="10dp"
        android:layout_marginRight="10dp"
        android:background="@null"
        android:text="Play Game"
        android:textColor="#ff0000"
        android:textStyle="italic" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:src="@drawable/messi" />

</LinearLayout>

Solution 2:

You can also do the following if you prefer this one, but you will have to add onClickListener() for each one of them:

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:background="@drawable/ronaldo"
    android:orientation="horizontal">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:background="@null"
        android:text="Play Game"
        android:textColor="#ff0000"
        android:textStyle="italic" />

    <ImageButton
        android:id="@+id/imageButton"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:src="@drawable/messi" />

</LinearLayout>

Solution 3:

As you have suggested in the comments, you would do something like this:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="80dp"
    android:layout_gravity="center"
    android:background="@drawable/ronaldo">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="80dp"
        android:layout_alignLeft="@+id/buttonLayout"
        android:layout_alignRight="@+id/buttonLayout"
        android:background="@null" />

    <LinearLayout
        android:id="@+id/buttonLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="80dp"
            android:gravity="center"
            android:text="Play Game"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="#ff0000"
            android:textStyle="italic" />

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="80dp"
            android:src="@drawable/messi" />

    </LinearLayout>

</RelativeLayout>

If you are using API >= 23, you can put the drawable resource within a XML file like this
messi_smaller.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/messi"
        android:width="smaller_width_in_dp"
        android:height="smaller_height_in_dp">
    </item>
</layer-list>

You must make sure to keep the drawable ratio when you set the width and the height. And just use this drawable in your button:

<Button
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:layout_gravity="center"
    android:drawablePadding="10dp"
    android:id="@+id/button"
    android:text="Play Game"
    android:background="@drawable/ronaldo"
    android:drawableRight="@drawable/messi_smaller" />

By this way, you can change the drawable size just in xml code

I deleted the button and made a layer like a button

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:background="@android:color/background_light"
    android:gravity="center"
    android:orientation="horizontal">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:onClick="go_map"
        android:clickable="true"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/img_m0"
            style="@style/menu2img"
            app:srcCompat="@drawable/ico_m0" />
       <TextView
            android:id="@+id/textView2"
            style="@style/menu2text"
            android:text="@string/men_map" />
    </LinearLayout>

you can use a RelativeLayout like this:

<RelativeLayout
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:background="@drawable/ronaldo">

    <Button
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="play game"
        />
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:background="@drawable/messi"
        android:scaleType="fitXY"
        />
</RelativeLayout>

Try this :

final Button button = (Button) findViewById(R.id.button1);
ViewTreeObserver vto = button.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            public boolean onPreDraw() {
                button.getViewTreeObserver().removeOnPreDrawListener(this);
                //scale to 90% of button height
                DroidUtils.scaleButtonDrawables(button, 0.9);
                return true;
            }
        });