ViewPager_ImageGallery

activity_main.xml
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<RelativeLayout 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"
  
    tools:context=".MainActivity" >
     <android.support.v4.view.ViewPager
 android:id="@+id/view_pager"
 android:layout_width="match_parent"
 android:layout_height="match_parent" />

</RelativeLayout>

MainActivity.java

---------------------

package com.kundan.viewpager_imagegallery;

import android.os.Bundle;

import android.app.Activity;

import android.support.v4.view.ViewPager;

import android.view.Menu;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

   ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);

   ImageAdapter adapter = new ImageAdapter(this);

   viewPager.setAdapter(adapter);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

 ImageAdapter.java

------------------------

package com.kundan.viewpager_imagegallery;

import android.content.Context;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

public class ImageAdapter extends PagerAdapter {

Context context;

    private int[] GalImages = new int[] {

        R.drawable.one,

        R.drawable.two,

        R.drawable.three

    };

    ImageAdapter(Context context){

    this.context=context;

    }

    @Override

    public int getCount() {

      return GalImages.length;

    }

    @Override

    public boolean isViewFromObject(View view, Object object) {

      return view == ((ImageView) object);

    }

    @Override

    public Object instantiateItem(ViewGroup container, int position) {

      ImageView imageView = new ImageView(context);

     

      imageView.setPadding(5, 5, 5, 5);

      imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);

      imageView.setImageResource(GalImages[position]);

      ((ViewPager) container).addView(imageView, 0);

      return imageView;

    }

    @Override

    public void destroyItem(ViewGroup container, int position, Object object) {

      ((ViewPager) container).removeView((ImageView) object);

    }

  }