如何在Android中将RecyclerView嵌套在NestedScrollView内?
本例演示了如何在Android中将RecyclerView嵌套在NestedScrollView内。
步骤1 − 在Android Studio中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建一个新项目。
在build.gradle (Module: app)中添加以下依赖项。
implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support:design:28.0.0' implementation 'com.android.support:recyclerview-v7:28.0.0' implementation 'com.android.support:cardview-v7:28.0.0' implementation 'com.intuit.sdp:sdp-android:1.0.3'
步骤2 − 将以下代码添加到res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <androidx.core.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="none"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:focusableInTouchMode="true" android:orientation="vertical"> <ImageView android:id="@+id/sellerProduct" android:layout_width="match_parent" android:layout_height="200dp" android:adjustViewBounds="true" android:src="@drawable/iphone" android:scaleType="fitXY" android:contentDescription="@string/app_name" /> <androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="vertical" android:id="@+id/productList"/> </LinearLayout> </androidx.core.widget.NestedScrollView> </LinearLayout>
步骤3 − 创建一个布局资源文件(list_item.xml)并添加以下代码−
<?xml version="1.0" encoding="utf-8"?> <androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" app:cardElevation="2dp" app:cardUseCompatPadding="true"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="vertical" android:padding="8dp"> <ImageView android:id="@+id/phoneImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:adjustViewBounds="true" android:contentDescription="TODO" android:src="@drawable/iphone2" /> <TextView android:id="@+id/phoneName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="IPHONE" android:textColor="@color/colorPrimaryDark" android:textSize="12sp" android:textStyle="bold" /> </LinearLayout> </androidx.cardview.widget.CardView>
步骤4 − 创建如下所述的java类文件并添加相应的代码−
PhoneAdapter.java −
import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import java.util.List; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; public class PhoneAdapter extends RecyclerView.Adapter<PhoneViewHolder>{ private Context context; private List<ProductObject> productList; PhoneAdapter(Context context, List<ProductObject> productList) { this.context = context; this.productList = productList; } @NonNull @Override public PhoneViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false); return new PhoneViewHolder(view); } @Override public void onBindViewHolder(PhoneViewHolder holder, int position){ ProductObject productObject = productList.get(position); int imageRes = getResourceId(context, productObject.getImagePath(), context.getPackageName()); holder.phoneImage.setImageResource(imageRes); holder.phoneName.setText(productObject.getName()); } @Override public int getItemCount() { return productList.size(); } private static int getResourceId(Context context, String pVariableName, String pPackageName) throws RuntimeException { try { return context.getResources().getIdentifier(pVariableName, "drawable", pPackageName); } catch (Exception e) { throw new RuntimeException("Error getting Resource ID.", e); } } }
PhoneViewHolder.java −
import android.view.View; import android.widget.ImageView; import android.widget.TextView; import androidx.recyclerview.widget.RecyclerView; class PhoneViewHolder extends RecyclerView.ViewHolder { ImageView phoneImage; TextView phoneName; PhoneViewHolder(View itemView) { super(itemView); phoneName = itemView.findViewById(R.id.phoneName); phoneImage = itemView.findViewById(R.id.phoneImage); } }
ProductObject.java −
class ProductObject { private String imagePath; private String name; ProductObject(String name, String imagePath) { this.imagePath = imagePath; this.name = name; } String getImagePath() { return imagePath; } String getName() { return name; } }
步骤5 − 将以下代码添加到src/MainActivity.java
import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.GridLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.os.Bundle; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerView bestRecyclerView = findViewById(R.id.productList); GridLayoutManager mGrid = new GridLayoutManager(this, 2); bestRecyclerView.setLayoutManager(mGrid); bestRecyclerView.setHasFixedSize(true); PhoneAdapter mAdapter = new PhoneAdapter(MainActivity.this, getProductTestData()); bestRecyclerView.setAdapter(mAdapter); } private List<ProductObject> getProductTestData() { List<ProductObject> featuredProducts = new ArrayList<>(); featuredProducts.add(new ProductObject("Iphone 6", "iphone2")); featuredProducts.add(new ProductObject("Iphone 6S", "iphone2")); featuredProducts.add(new ProductObject("Iphone 8S", "iphone2")); featuredProducts.add(new ProductObject("Iphone X", "iphone2")); featuredProducts.add(new ProductObject("Iphone XR", "iphone2")); featuredProducts.add(new ProductObject("Iphone XS", "iphone2")); return featuredProducts; } }
步骤6 − 将以下代码添加到androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序,请打开您项目中的一个活动文件,然后单击工具栏中的运行 图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕−
点击这里下载项目代码。
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