Hướng dẫn và ví dụ Android StackView

package org.o7planning.androidstackview;

public class StackItem {

    private String itemText;

    // "image1","image2",..
    private String imageName;

    public StackItem(String text, String imageName) {
        this.imageName = imageName;
        this.itemText = text;
    }

    public String getImageName() {
        return imageName;
    }


    public String getItemText() {
        return itemText;
    }

}

package org.o7planning.androidstackview;

import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class StackAdapter extends ArrayAdapter<StackItem> {

    private List<StackItem> items;
    private Context context;

    public StackAdapter(Context context, int textViewResourceId,
                        List<StackItem> objects) {
        super(context, textViewResourceId, objects);
        this.items = objects;
        this.context = context;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View itemView = convertView;
        if (itemView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            itemView = layoutInflater.inflate(R.layout.stack_item, null);
        }
        StackItem stackItem = items.get(position);
        if(stackItem== null)  {
            Log.i("MyLog", "stackItem at " + position + " is null!!!");
            return itemView;
        }
        // TextView defined in the stack_item.xml
        TextView textView = (TextView) itemView.findViewById(R.id.textView);

        // ImageView defined in the stack_item.xml
        ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);

        textView.setText(stackItem.getItemText());

        // "image1", "image2",..
        String imageName= stackItem.getImageName();

        int resId= this.getDrawableResIdByName(imageName);

        imageView.setImageResource(resId);
        imageView.setBackgroundColor(Color.rgb(211,204,188));

        return itemView;
    }


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

}

package org.o7planning.androidstackview;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.graphics.Color;
import android.view.View;
import android.widget.Button;
import android.widget.StackView;

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

public class MainActivity extends AppCompatActivity {

    private StackView stackView;
    private Button buttonPrevious;
    private Button buttonNext;

    private final String[] IMAGE_NAMES= {"image1","image2", "image3", "image4","image5"};

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

        this.stackView = (StackView) findViewById(R.id.stackView);
        this.buttonNext =(Button) findViewById(R.id.button_next);
        this.buttonPrevious= (Button) findViewById(R.id.button_previous);

        List<StackItem> items = new ArrayList<StackItem>();

        for(String imageName: IMAGE_NAMES) {
            items.add(new StackItem(imageName+".png", imageName));
        }

        StackAdapter adapt = new StackAdapter(this, R.layout.stack_item, items);
        stackView.setAdapter(adapt);
        stackView.setHorizontalScrollBarEnabled(true);
        stackView.setBackgroundColor(Color.rgb(230, 255, 255));

        buttonNext.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                stackView.showNext();
            }
        });

        buttonPrevious.setOnClickListener(new Button.OnClickListener(){

            @Override
            public void onClick(View v) {
                stackView.showPrevious();
            }
        });
    }


}