In -depth analysis of the technical principles of Android Support Cardview V7 framework

Detailed explanation of the technical principles of Android SUPPORT CARDView V7 framework Overview Android Support Cardview V7 framework is a support library provided by Android to implement a card -type interface design in Android applications.The CardView V7 framework provides a simple and flexible way to create a card view to make the application interface more beautiful and consistent.This article will analyze the technical principles of the CardView V7 framework and provide some Java code examples. The main features of the CardView V7 framework include: 1. Round corner, shadow effect: CardView can add rounded corners and shadows to the view, enhancing the beauty of the card -type interface. 2. Custom background color and border: CardView can customize the background color and border to meet the design needs. 3. Any nested: CardView can be nested in other views to achieve a complex layout structure. 4. Easy to realize clicks and touch events: CardView provides a convenient click -through and touch event processing mechanism. Technical principle The implementation principle of the CardView V7 framework mainly depends on two important components: ViewGroup and Drawable. 1. ViewGroup: CardView is a ViewGroup inherited from Framelayout.In CardView, it will create a rectangular actual ContentView as needed, and draw the corner and shadow effect on it.Since CardView inherits from Framelayout, it can accommodate a sub -view, which is also the key to achieving nested effects. 2. Drawable: CardView uses Drawable objects to draw the corner and shadow effect.Android provides a special DRAWABLE type called RoundedCornernerDrawable to achieve rounded effects.CardView also uses a special Drawable type called ShadowDrawable for the shadow effect.These Drawable objects are drawn accordingly according to the attribute of CardView. For example code The following is an example of a simple CardView: 1. Add dependencies to the BUILD.GRadle file of the app: gradle dependencies { implementation 'com.android.support:cardview-v7:28.0.0' } 2. Add CardView to the layout file: <android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="wrap_content" app:cardCornerRadius="8dp" app:cardElevation="4dp" app:cardBackgroundColor="#FFFFFF"> <!-Add CardView content here--> </android.support.v7.widget.CardView> In this example, we created a CardView with a rounded corner radius of 8DP, the shadow height is 4DP, and the background color is white.You can add any other views in CardView as the content. in conclusion The Android SUPPORT CARDVIEW V7 framework provides a simple and powerful tool to implement the card -type interface design.This article introduces the technical principle of the CardView V7 framework and provides an example of use.By using CardView appropriately, you can easily create an interface design that appears, add more attractiveness to your application.