How does Layouts in Android work internally in Android SDK?

Understanding how layouts work internally in the Android SDK is crucial for developers aiming to create responsive and visually appealing applications. Android uses various layout types that determine how UI elements are arranged on the screen.

Layouts in Android work based on a tree structure of Views and ViewGroups. A ViewGroup is a special type of View that can contain other Views (children), making it a parent to its child Views. The layout measuring and layout pass involves multiple steps, including measuring, layouting, and drawing, where the dimensions and positions of each view are calculated.

When an Activity is launched, the framework initializes the layout by creating an instance of a ViewGroup, typically defined in XML. Each child View is then measured and laid out based on the layout parameters defined in the XML.

Here’s a simple example illustrating a LinearLayout containing two TextViews and a Button:


    <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:text="Hello, World!" />
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Welcome to Android Layouts!" />
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Click Me!" />
    
    </LinearLayout>

Android Layouts ViewGroup View UI Elements Responsive Design Android SDK

How does Layouts in Android work internally in Android SDK?

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How does Layouts in Android work internally in Android SDK?

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