Android Gallery View Example

A Gallery is a View commonly used to display items in a horizontally scrolling list that locks the current selection at the center.

• Gallery can be used to show Views in a horizontal list, and user can select a View , User selected view will be shown in center of the Horizontal list 
• The items of Gallery are populated from an Adapter, similar to ListView, in which ListView items are populated from an Adapter.
• We need to create an Adapter class which extends BaseAdapter class and override  getView() method.                                                                                              
• getView() method called automatically for all items of Gallery (similar to list view in which getView() method called for each item of ListView)

GalleryView Example

In our GalleryView Example we have populated the Gallery with images.
The images will be shown in horizontal list, when user selects/click on an image , the selected Image will be shown in center of the screen. (See the Screenshot below)

Handle touch/click event on Gallery:
We need to add click Listener to gallery  in order to handle the touch event on gallery.

main.xml

We have a gallery and an ImageView, we will show the User selected image in ImageView.

<LinearLayout 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"
    android:orientation="vertical">

 
    <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
   
     <ImageView
        android:id="@+id/imageView1"
        android:layout_marginTop="100dp"
        android:layout_width="250dp"
        android:layout_gravity="center_horizontal"
        android:layout_height="250dp"
        android:src="@drawable/image1" />

 </LinearLayout>

MainActivity

public class MainActivity extends Activity
{

     ImageView selectedImage; 
     private Integer[] mImageIds = {
                R.drawable.image1,
                R.drawable.image2,
                R.drawable.image3,
                R.drawable.image4,
                R.drawable.image5,
                R.drawable.image6,
                R.drawable.image7,
                R.drawable.image8
        };
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
      
             Gallery gallery = (Gallery) findViewById(R.id.gallery1);
        selectedImage=(ImageView)findViewById(R.id.imageView1);
        gallery.setSpacing(1);
        gallery.setAdapter(new GalleryImageAdapter(this));

         // clicklistener for Gallery
        gallery.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                Toast.makeText(MainActivity.this, "Your selected position = " + position, Toast.LENGTH_SHORT).show();
                // show the selected Image
                selectedImage.setImageResource(mImageIds[position]);
            }
        });
    }
 
}

GalleryImageAdapter 

public class GalleryImageAdapter extends BaseAdapter
{
    private Context mContext;

    private Integer[] mImageIds = {
            R.drawable.image1,
            R.drawable.image2,
            R.drawable.image3,
            R.drawable.image4,
            R.drawable.image5,
            R.drawable.image6,
            R.drawable.image7,
            R.drawable.image8
    };

    public GalleryImageAdapter(Context context)
    {
        mContext = context;
    }

    public int getCount() {
        return mImageIds.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }


    // Override this method according to your need
    public View getView(int index, View view, ViewGroup viewGroup)
    {
        // TODO Auto-generated method stub
        ImageView i = new ImageView(mContext);

        i.setImageResource(mImageIds[index]);
        i.setLayoutParams(new Gallery.LayoutParams(200, 200));
   
        i.setScaleType(ImageView.ScaleType.FIT_XY);

        return i;
    }
}

 

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