Die Anleitung zu Android CardView

implementation 'androidx.cardview:cardview:1.0.0'

implementation 'androidx.cardview:cardview:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.0.0'

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5sp"
    android:layout_marginTop="5sp"
    android:layout_marginRight="5sp"
    android:layout_marginBottom="5sp"
    app:cardBackgroundColor="#FAF5F5">

</androidx.cardview.widget.CardView>

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5sp"
    android:layout_marginTop="5sp"
    android:layout_marginRight="5sp"
    android:layout_marginBottom="5sp"
    app:cardBackgroundColor="#FAF5F5">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/imageView_flag"
            android:layout_width="110sp"
            android:layout_height="90sp"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="16dp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_launcher_foreground"
            tools:ignore="VectorDrawableCompat" />

        <TextView
            android:id="@+id/textView_countryName"
            android:layout_width="0dp"
            android:layout_height="35dp"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:text="Country Name"
            android:textSize="22sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView_flag"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/textView_population"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:text="Popupation"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView_flag"
            app:layout_constraintTop_toBottomOf="@+id/textView_countryName" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>

package org.o7planning.cardviewexample;

public class Country {

    private String countryName;

    // Image name (Without extension)
    private String flagName;
    private int population;

    public Country(String countryName, String flagName, int population) {
        this.countryName= countryName;
        this.flagName= flagName;
        this.population= population;
    }

    public int getPopulation() {
        return population;
    }

    public void setPopulation(int population) {
        this.population = population;
    }

    public String getCountryName() {
        return countryName;
    }

    public void setCountryName(String countryName) {
        this.countryName = countryName;
    }

    public String getFlagName() {
        return flagName;
    }

    public void setFlagName(String flagName) {
        this.flagName = flagName;
    }

    @Override
    public String toString()  {
        return this.countryName+" (Population: "+ this.population+")";
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.cardviewexample;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class CustomRecyclerViewAdapter extends RecyclerView.Adapter<CountryViewHolder> {


    private List<Country> countries;
    private Context context;
    private LayoutInflater mLayoutInflater;

    public CustomRecyclerViewAdapter(Context context, List<Country> datas ) {
        this.context = context;
        this.countries = datas;
        this.mLayoutInflater = LayoutInflater.from(context);
    }

    @Override
    public CountryViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
        // Inflate view from recyclerview_item_layout.xml
        View recyclerViewItem = mLayoutInflater.inflate(R.layout.recyclerview_item_layout, parent, false);

        recyclerViewItem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handleRecyclerItemClick( (RecyclerView)parent, v);
            }
        });
        return new CountryViewHolder(recyclerViewItem);
    }


    @Override
    public void onBindViewHolder(CountryViewHolder holder, int position) {
        // Cet country in countries via position
        Country country = this.countries.get(position);

        int imageResId = this.getDrawableResIdByName(country.getFlagName());
        // Bind data to viewholder
        holder.flagView.setImageResource(imageResId);
        holder.countryNameView.setText(country.getCountryName() );
        holder.populationView.setText("Population: "+ country.getPopulation());
    }

    @Override
    public int getItemCount() {
        return this.countries.size();
    }

    // Find Image ID corresponding to the name of the image (in the directory drawable).
    public int getDrawableResIdByName(String resName)  {
        String pkgName = context.getPackageName();
        // Return 0 if not found.
        int resID = context.getResources().getIdentifier(resName , "drawable", pkgName);
        Log.i(MainActivity.LOG_TAG, "Res Name: "+ resName+"==> Res ID = "+ resID);
        return resID;
    }

    // Click on RecyclerView Item.
    private void handleRecyclerItemClick(RecyclerView recyclerView, View itemView) {
        int itemPosition = recyclerView.getChildLayoutPosition(itemView);
        Country country  = this.countries.get(itemPosition);

        Toast.makeText(this.context, country.getCountryName(), Toast.LENGTH_LONG).show();
    }
}

package org.o7planning.cardviewexample;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class CountryViewHolder extends   RecyclerView.ViewHolder {

    ImageView flagView;
    TextView countryNameView;
    TextView populationView;

    // @itemView: recyclerview_item_layout.xml
    public CountryViewHolder(@NonNull View itemView) {
        super(itemView);

        this.flagView = (ImageView) itemView.findViewById(R.id.imageView_flag);
        this.countryNameView = (TextView) itemView.findViewById(R.id.textView_countryName);
        this.populationView = (TextView) itemView.findViewById(R.id.textView_population);
    }
}

package org.o7planning.cardviewexample;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    public static final String LOG_TAG = "AndroidExample";
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        List<Country> countries = getListData();
        this.recyclerView = (RecyclerView) this.findViewById(R.id.recyclerView);
        recyclerView.setAdapter(new CustomRecyclerViewAdapter(this, countries));

        // RecyclerView scroll vertical
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recyclerView.setLayoutManager(linearLayoutManager);
    }

    private  List<Country> getListData() {
        List<Country> list = new ArrayList<Country>();
        Country vietnam = new Country("Vietnam", "vn", 98000000);
        Country usa = new Country("United States", "us", 320000000);
        Country russia = new Country("Russia", "ru", 142000000);
        Country autraylia = new Country("Autraylia", "au", 25000000);
        Country japan = new Country("Japan", "jp", 126000000);

        list.add(vietnam);
        list.add(usa);
        list.add(russia);
        list.add(autraylia);
        list.add(japan);

        return list;
    }


}