Android support library coordinatorLayout Frequently Asked Questions Answers

Android Support Library is a powerful library that contains many useful classes and components that can simplify the development process of Android applications.CoordinatorLayout is one of the very commonly used categories to achieve complex interaction effects and animation effects.This article will answer some common questions about CoordinatorLayout and provide the necessary Java code examples. 1. What is CoordinatorLayout? CoordinatorLayout is a special layout container inherited from Framelayout to coordinate and interact with sub -views.It can combine multiple sub -views and achieve different layout behaviors. 2. What is the main role of CoordinatorLayout? The main role of CoordinatorLayout is to handle the interactive effects between sub -views, such as responding to rolling events, the location and size of coordinating sub -view. 3. What is the difference between coordinatorLayout and other layout containers? Compared with other layout containers, CoordinatorLayout has more powerful control and interactive characteristics.It can handle the coordination relationship between sub -views, such as associating the position and size of one view with the rolling event of another view. 4. What are the common attributes of CoordinatorLayout? CoordinatorLayout has some common attributes that can be used to set the behavior and appearance of sub -view.Some commonly used attributes include: -PP: Layout_behavior: Actions used to set sub -views can customize behavior in the code. -Android: ID: It is used to identify the sub -view in the coordinatorLayout. -Android: layout_gravity: The alignment method of setting a sub -view in CoordinatorLayout. 5. How to set the behavior of sub -view in CoordinatorLayout? You can specify the corresponding behavior by setting the app: layout_behavior property of the sub -view.For example, you can use AppBarLayout.scrolllingViewBehavior to associate a rolling view with AppBarlayout to achieve the effect of response rolling events. <androidx.coordinatorlayout.widget.CoordinatorLayout android:layout_width="match_parent" android:layout_height="match_parent"> <com.google.android.material.appbar.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <!-APPBARLAYOUUT content-> </com.google.android.material.appbar.AppBarLayout> <androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior" /> </androidx.coordinatorlayout.widget.CoordinatorLayout> 6. How to customize the behavior of CoordinatorLayout? You can achieve custom behavior of coordinatorLayout by creating a custom Behavior class.First, create a subclass inherited from the coordinatorLayout.behavior, and rewrite the correlation methods, such as layoutDependson () and onDependentViewChanged ().Then apply this custom Behavior to the sub -view, and specify the behavior by setting the App: Layout_behavior property. public class CustomBehavior extends CoordinatorLayout.Behavior<View> { // Rewrite it here to rewrite the relevant methods } ... <androidx.coordinatorlayout.widget.CoordinatorLayout android:layout_width="match_parent" android:layout_height="match_parent"> <com.google.android.material.appbar.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <!-APPBARLAYOUUT content-> </com.google.android.material.appbar.AppBarLayout> <androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="com.example.app.CustomBehavior" /> </androidx.coordinatorlayout.widget.CoordinatorLayout> 7. What are the common uses of CoordinatorLayout? CoordinatorLayout is widely used to achieve complex interaction and animation effects.For example, you can use it to achieve the hidden and display of the titles that can be scalable and the suspended buttons. The above is the answer to the common questions about CoordinatorLayout in Android Support Library, as well as the corresponding Java code example.By using CoordinatorLayout correctly, you can achieve more flexible and interactive Android applications.