Analysis of the implementation principles and design ideas of Android SUPPORT CARDVIEW V7 framework

CardView V7 is a control in the Android support library. It provides a card -type layout effect, making the interface mask a more modern and beautiful appearance.Below, the implementation principles and design ideas of CardView V7 will be analyzed, and the relevant Java code example will be provided. 1. Principles analysis CardView V7 is implemented based on RecyclerView in the Android support library.RecyclerView is a highly customized control to display list data.CardView V7 achieves a card -type layout effect by adding a CardView control to each list item in RecyclerView. CardView V7 uses the Composite mode, which consists of multiple subconsiament, including the content view, shadow effect and border style of the card.When the layout of CardView V7 is determined, it will draw the background effect of the card according to the set shadow and border style. 2. Design ideas analysis CardView V7's design ideas mainly include the following aspects: (1) Define the layout of CardView: Define the layout of CardView through the XML file, including the content view, shadow effect and border style of the card. (2) Set the attribute of CardView: Set the attribute of CardView through Java code, including shadow effects, frame styles, and the number of rounded angles of the card. (3) Add CardView to the list item of RecyclerView: In the recyclerView adapter, add the CardView control to each list item and set the corresponding content view. (4) Clicks on CardView: Add a click event monitor to CardView, and perform the corresponding logic when the user clicks the card. 3. Code example (1) Define the layout of CardView <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:foreground="?attr/selectableItemBackground" android:clickable="true" android:focusable="true" android:orientation="vertical" android:layout_margin="8dp"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="8dp"> <!-The content view of the card, you can add other controls such as TextView, ImageView and other controls-> </LinearLayout> </android.support.v7.widget.CardView> (2) Set the attribute of CardView CardView cardView = findViewById(R.id.cardview); CardView.Setradius (10); // Set the rounded angle number of the card CardView.setCardelevation (8); // Set the shadow height of the card CardView.setContentPadding (4, 4, 4, 4); // Set the contents of the contents of the contents of the card (3) Add CardView to the list item of recyclerview In RecyclerView adapter, add the CardView control to each list item and set the corresponding content view. @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { CardView cardView = holder.cardView; // Set the content of the card TextView textView = cardView.findViewById(R.id.textview); textView.setText(dataList.get(position)); cardView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Treat the clicks of the card } }); } (4) Handle CardView clicks Add a clicks to CardView to perform the corresponding logic when the user clicks the card. cardView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Treat the clicks of the card } }); The above is the analysis of the implementation principles and design ideas of the CardView V7 framework, as well as related Java code examples.CardView V7's flexibility and customization allows us to perform personalized beautification and interactive operations according to actual needs.