Difference between a View's Padding and Margin

View's Margin和Padding有什么区别？

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To help me remember the meaning of padding , I think of a big coat with lots of thick cotton padding . I'm inside my coat, but me and my padded coat are together. We're a unit.

But to remember margin , I think of, " Hey, give me some margin! " It's the empty space between me and you. Don't come inside my comfort zone -- my margin.

To make it more clear, here is a picture of padding and margin in a TextView :

xml layout for the image above

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="#c5e1b0"
        android:textColor="#000000"
        android:text="TextView margin only"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="#f6c0c0"
        android:textColor="#000000"
        android:text="TextView margin only"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#c5e1b0"
        android:padding="10dp"
        android:textColor="#000000"
        android:text="TextView padding only"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#f6c0c0"
        android:padding="10dp"
        android:textColor="#000000"
        android:text="TextView padding only"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="#c5e1b0"
        android:textColor="#000000"
        android:padding="10dp"
        android:text="TextView padding and margin"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="#f6c0c0"
        android:textColor="#000000"
        android:padding="10dp"
        android:text="TextView padding and margin"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#c5e1b0"
        android:textColor="#000000"
        android:text="TextView no padding no margin"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#f6c0c0"
        android:textColor="#000000"
        android:text="TextView no padding no margin"
        android:textSize="20sp" />

</LinearLayout>

Related

Gravity vs layout_gravity

Match_parent vs wrap_content

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Padding is the space inside the border, between the border and the actual view's content. Note that padding goes completely around the content: there is padding on the top, bottom, right and left sides (which can be independent).

Margins are the spaces outside the border, between the border and the other elements next to this view. In the image, the margin is the grey area outside the entire object. Note that, like the padding, the margin goes completely around the content: there are margins on the top, bottom, right, and left sides.

An image says more than 1000 words (extracted from Margin Vs Padding - CSS Properties):

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Padding is inside of a View.

Margin is outside of a View.

This difference may be relevant to background or size properties.

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