How to remove padding around buttons in Android?

Question

For me the problem turned out to be minHeight and minWidth on some of the Android themes.

On the Button element, add:

<Button android:minHeight="0dp" android:minWidth="0dp" ...

Or in your button's style:

<item name="android:minHeight">0dp</item>
<item name="android:minWidth">0dp</item>

My solution was set to 0 the insetTop and insetBottom properties.

<android.support.design.button.MaterialButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:insetTop="0dp"
        android:insetBottom="0dp"
        android:text="@string/view_video"
        android:textColor="@color/white"/>

That's not padding, it's the shadow around the button in its background drawable. Create your own background and it will disappear.

for MaterialButton, add below properties, it will work perfectly

<android.support.design.button.MaterialButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:insetTop="0dp"
    android:insetBottom="0dp"/>

A workaround may be to try to use -ve values for margins like following:

<Button
    android:id="@+id/button_back"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:onClick="CloseActivity"
    android:padding="0dp"
    android:layout_marginLeft="-5dip"
    android:layout_marginRight="-5dip"
    android:layout_marginTop="-5dip"
    android:layout_marginBottom="-5dip"
    android:text="@string/back" />

It will make that space vanish. I mean you can choose the appropriate dip value, which makes it go away. It worked for me. Hope it works for you.

To remove the Top and Bottom padding

<com.google.android.material.button.MaterialButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:minHeight="0dp"//to effect the following parameters, this must be added!
        android:insetTop="0dp"
        android:insetBottom="0dp"/>

To remove the Left and Right padding

<com.google.android.material.button.MaterialButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:minWidth="0dp"//to effect the following parameters, this must be added!
        android:insetLeft="0dp"
        android:insetRight="0dp"/>