如何在 recyclerview 中使用 cardview？

本示例演示了如何在 recyclerview 中使用 cardview

步骤 1 − 在 Android Studio 中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的信息以创建一个新项目。

步骤 2 − 将以下代码添加到 res/layout/activity_main.xml 中。

<?xml version = "1.0" encoding = "utf-8"?>
<android.support.design.widget.CoordinatorLayout android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   xmlns:android = "http://schemas.android.com/apk/res/android"
   xmlns:app = "http://schemas.android.com/apk/res-auto">
   <android.support.design.widget.AppBarLayout
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content">
      <android.support.v7.widget.Toolbar
         android:id = "@+id/appbarlayout_tool_bar"
         android:background = "@color/colorPrimary"
         android:layout_width = "match_parent"
         android:layout_height = "?attr/actionBarSize"
         app:layout_scrollFlags = "scroll|snap|enterAlways"
         app:theme = "@style/ThemeOverlay.AppCompat.Dark.ActionBar"
         app:popupTheme = "@style/ThemeOverlay.AppCompat.Light" />
   </android.support.design.widget.AppBarLayout>
   <android.support.v7.widget.RecyclerView
      android:id = "@+id/recycler_view"
      android:layout_width = "match_parent"
      android:layout_height = "match_parent"
      app:layout_behavior = "@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>

在上面的代码中，我们采用了应用程序栏布局和回收视图。

步骤 3 − 将以下代码添加到 src/MainActivity.java 中

<?xml version = "1.0" encoding = "utf-8"?>
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.content.pm.ShortcutInfoCompat;
import android.support.v4.content.pm.ShortcutManagerCompat;
import android.support.v4.graphics.drawable.IconCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v7.widget.Toolbar;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
   private RecyclerView recyclerView;
   private customAdapter mAdapter;
   TextView text;
   ArrayList<String> list = new ArrayList<>();
   @TargetApi(Build.VERSION_CODES.LOLLIPOP)
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Toolbar toolbar = (android.support.v7.widget.Toolbar)findViewById(R.id.appbarlayout_tool_bar);
      toolbar.setTitle("This is toolbar.");
      setSupportActionBar(toolbar);
      recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
      RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
      recyclerView.setLayoutManager(mLayoutManager);
      recyclerView.setItemAnimator(new DefaultItemAnimator());
      mAdapter = new customAdapter(this,list);
      recyclerView.setAdapter(mAdapter);
      recyclerView.addItemDecoration(new DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.VERTICAL));
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
      list.add("Krishna");
      list.add("prasad");
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
      list.add("sairamm");
      list.add("Krishna");
      list.add("prasad");
   }
}

步骤 4 − 将以下代码添加到 Manifest.xml 中

<?xml version = "1.0" encoding = "utf-8"?>
<manifest xmlns:android = "http://schemas.android.com/apk/res/android"
   package = "com.example.myapplication">
   <uses-permission android:name = "android.permission.INTERNET" />
   <uses-permission android:name = "com.android.launcher.permission.INSTALL_SHORTCUT" />
   <application
      android:allowBackup = "true"
      android:theme = "@style/AppTheme.NoActionBar"
      android:icon = "@mipmap/ic_launcher"
      android:label = "@string/app_name"
      android:roundIcon = "@mipmap/ic_launcher_round"
      android:supportsRtl = "true">
      <activity
         android:name = ".MainActivity"
         android:configChanges = "keyboardHidden|orientation|screenSize">
         <intent-filter>
            <action android:name = "android.intent.action.MAIN" />
            <action android:name = "android.intent.action.CREATE_SHORTCUT" />
            <category android:name = "android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

步骤 5 − 将以下代码添加到 customAdapter.java 中

<?xml version = "1.0" encoding = "utf-8"?>
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;

public class customAdapter extends RecyclerView.Adapter<customAdapter.MyViewHolder> {
   Context context;
   ArrayList<String> list;
   public class MyViewHolder extends RecyclerView.ViewHolder {
      public TextView title;
      public MyViewHolder(View view) {
         super(view);
         title = (TextView) view.findViewById(R.id.title);
      }
   }
   public customAdapter(Context context, ArrayList<String> list) {
      this.context = context;
      this.list = list;
   }
   @NonNull
   @Override
   public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
      View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, viewGroup, false);
      return new MyViewHolder(itemView);
   }
   @Override
   public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {
      myViewHolder.title.setText(list.get(i));
   }
   @Override
   public int getItemCount() {
      return list.size();
   }
}

步骤 6 − 将以下代码添加到 list_row.xml 中

<?xml version = "1.0" encoding = "utf-8"?>
<android.support.v7.widget.CardView xmlns:android = "http://schemas.android.com/apk/res/android"
   xmlns:app = "http://schemas.android.com/apk/res-auto"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "wrap_content"
   app:cardBackgroundColor = "@color/colorAccent"
   app:cardElevation = "10dp"
   app:cardCornerRadius = "20dp"
   tools:context = ".MainActivity">
   <LinearLayout
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content"
      android:gravity = "center"
      android:orientation = "vertical">
      <ImageView
         android:id = "@+id/imageView2"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:src = "@drawable/logo" />
      <TextView
         android:id = "@+id/title"
         android:layout_width = "match_parent"
         android:layout_height = "wrap_content"
         android:gravity = "center"
         android:textSize = "30sp" />
      <TextView
         android:id = "@+id/textview2"
         android:layout_width = "match_parent"
         android:layout_height = "wrap_content"
         android:gravity = "center"
         android:text = "Sairamkrishan"
         android:textSize = "30sp" />
   </LinearLayout>
</android.support.v7.widget.CardView>

让我们尝试运行你的应用程序。我假设你已将你的实际安卓移动设备与你的计算机连接。要通过 Android Studio 运行应用程序，请打开一个项目活动文件，然后单击工具栏上的运行图标。选择移动设备作为选项，然后检查移动设备，该设备会显示你的默认屏幕 -