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http://androidimran.blogspot.kr/2012/06/android-gallery-example.html

Android Gallery Example

Gallery is an internal element which can scroll horizontally and layout component of the currently selected child elements are positioned in the center of it.

STEP 1: Creating a new project from File->New->Android Project with Gallerydemo Activity Name

STEP 2: Copy Image files to res/drawable Folder

STEP 3: In res/layout/main.xm layout add ImageView and Gallery View as:

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<?xml version="1.0" encoding="utf-8"?> <FrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >       <!-- ImageView for display image in background -->     <ImageView          android:id="@+id/imgview"          android:layout_width="fill_parent"          android:layout_height="fill_parent"          android:src="@drawable/a01"           />                     <!-- Gallery To show images Gallery  -->          <Gallery xmlns:android="http://schemas.android.com/apk/res/android"          android:id="@+id/galleryview"          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:spacing="5dp"          />   </FrameLayout >

STEP 4: In res/values add attrs.xml as:

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<?xml version="1.0" encoding="utf-8"?> <resources>    <declare-styleable name="HelloGallery">          <attr name="android:galleryItemBackground"/>     </declare-styleable> </resources>

STEP 5: In Gallerydemo Activity Create an ImageAdapter which extends BaseAdapter as:

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package com.imrankhanandroid.Galleryexp;   import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener;   public class Gallerydemo extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);       //Remove title bar         this.requestWindowFeature(Window.FEATURE_NO_TITLE);       //Remove notification bar         this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,         WindowManager.LayoutParams.FLAG_FULLSCREEN);         setContentView(R.layout.main);                   final ImageView imagevew = (ImageView)findViewById(R.id.imgview);          Gallery gallryview = (Gallery)findViewById(R.id.galleryview);         gallryview.setAdapter(new ImageAdapter(this));         gallryview.setOnItemClickListener(new OnItemClickListener() {       @Override     public void onItemClick(AdapterView<!--?--> parent,             View view, int position,long id) {         // TODO Auto-generated method stub             // The first few pictures show click         Toast.makeText(Gallerydemo.this, "" + position,                   Toast.LENGTH_LONG).show();          //Set the backgroundPart of theImageView         imagevew.setImageResource(((ImageView) view).getId());             }         });     }     public class ImageAdapter extends BaseAdapter {           int mGalleryItemBackground;          // Context object         private Context mContext;          // Picture array         private Integer[] mImageIds ={                 R.drawable.a01,R.drawable.a02,                 R.drawable.a03,R.drawable.a04,                 R.drawable.a05,R.drawable.a06,                 R.drawable.a07,R.drawable.a08,                 R.drawable.a09,R.drawable.a010,         };         // ImageAdapter Constructor         public ImageAdapter(Context c) {           this.mContext = c;           //styleable resources           TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery);           mGalleryItemBackground = a.getResourceId(             R.styleable.HelloGallery_android_galleryItemBackground,0);             a.recycle();         }         // Get  number of items         @Override         public int getCount() {             // TODO Auto-generated method stub             return mImageIds.length;          }           @Override         public Object getItem(int position) {             // TODO Auto-generated method stub             return position;         }           @Override         public long getItemId(int position) {             // TODO Auto-generated method stub             return position;         }         //Return  view         @Override         public View getView(int position, View convertView,                    ViewGroup parent) {             // TODO Auto-generated method stub             ImageView iv = new ImageView(mContext);             iv.setImageResource(mImageIds[position]);             iv.setId(mImageIds[position]);              iv.setLayoutParams(new Gallery.LayoutParams(120, 160));              iv.setScaleType(ImageView.ScaleType.FIT_XY);             iv.setBackgroundResource(mGalleryItemBackground);             return iv;         }     }       }

Download Source Code: GalleryExample