안드로이드 스튜디오 이미지 슬라이더 ( ImagePager, Adapter )

 

 

< ActivityPractice.java >

package com.example.myapplication;
 
import android.os.Bundle;
 
 
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
 
public class PracticeActivity extends AppCompatActivity {
 
    PracticeAdapter adapter;
    ViewPager viewPager;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_practice);
 
        viewPager = findViewById(R.id.ViewPager_Practice);
        adapter = new PracticeAdapter(this);
        viewPager.setAdapter(adapter);
 
    } // OnCreate END
 
}

 

< PracticeAdapter.java >

package com.example.myapplication;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
 
import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;
 
public class PracticeAdapter extends PagerAdapter {
 
    private int[] images = {R.drawable.icon_happy,R.drawable.yellow_something,R.drawable.yellow_star};
    private LayoutInflater inflater;
    private Context context;
 
    public PracticeAdapter(Context context){
        this.context = context;
    }
 
    @Override
    public int getCount() {
        return images.length;
    }
 
    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view==object;
    }
 
    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
 
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = inflater.inflate(R.layout.activity_practice_2,container,false);
 
        ImageView imageView = v.findViewById(R.id.ImageView_practice);
        TextView textView = v.findViewById(R.id.TextView_Practice);
 
        imageView.setImageResource(images[position]);
        textView.setText((position+1) +" 번 째 이미지입니다.");
 
        container.addView(v);
        return v;
    }
 
    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.invalidate();
    }
}
 

 

< activity_practice.xml >

<?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=".PracticeActivity">
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center_horizontal">
 
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/ViewPager_Practice"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    ></androidx.viewpager.widget.ViewPager>
 
    </LinearLayout>
 
</androidx.constraintlayout.widget.ConstraintLayout>

< activity_practice_2.xml > ImageView를 위한 디자인

<?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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center_horizontal">
 
 
        <ImageView
            android:id="@+id/ImageView_practice"
            android:layout_width="100dp"
            android:layout_height="100dp">
 
        </ImageView>
 
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="30dp"
            android:id="@+id/TextView_Practice">
 
        </TextView>
 
 
    </LinearLayout>
 
</androidx.constraintlayout.widget.ConstraintLayout>