Android 3.0 Photo Gallery

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FormatLanguage: WikiFormat

Problem:

Display a photo gallery

Solution:

1. Download the preview release of Android 3.0 using either the SDK download manager (preferred) or from within the Eclipse IDE using Android SDK and AVD # Create an AVD to run the emulator
2. Create an Android project (Important: set the Min. SDK Version to "Honeycomb") and Click Finish!
3. Create a main entry point java file eg. Main.java
4. Create an ImageAdapter.java file
5. Create an XML layout file: main.xml
6. Package and Run the Android app.

Discussion:

File: main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:gravity="center"
	>

	<Gallery
		android:id="@+id/gallery1"
		android:layout_height="wrap_content"
		android:layout_width="match_parent"
		android:spacing="10dip"
		>
	</Gallery>
</LinearLayout>

File: Main.java

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;
import android.widget.Toast;

public class Main extends Activity implements OnItemClickListener
	{
		private static final String tag = "Main";
		private Gallery _gallery;
		private ImageAdapter _imageAdapter;

		/** Called when the activity is first created. */
		@Override
		public void onCreate(Bundle savedInstanceState)
			{
				super.onCreate(savedInstanceState);
				setContentView(R.layout.main);
				setTitle("Android Honeycomb Photo Gallery Example");

				_gallery = (Gallery) this.findViewById(R.id.gallery1);
				_imageAdapter = new ImageAdapter(this);
				_gallery.setAdapter(_imageAdapter);
				_gallery.setOnItemClickListener(this);
			}

		@Override
		public void onItemClick(AdapterView<?> arg0, View view, int position, long duration)
			{
				int resourcId = (Integer) _imageAdapter.getItem(position);
				Drawable drawable = getResources().getDrawable(resourcId);
				Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resourcId);

				Toast.makeText(this, "Selected Image: " + getResources().getText(resourcId) + "\nHeight: " + bitmap.getHeight() + "\nWidth: " + bitmap.getWidth(), Toast.LENGTH_SHORT).show();
			}
	}

File: ImageAdapter.java

public class ImageAdapter extends BaseAdapter
	{
		private Context _context = null;
		private final int[] imageIds = { R.drawable.formula, R.drawable.hollywood, R.drawable.mode1, R.drawable.mode2, R.drawable.mother1, R.drawable.mother2,    R.drawable.nights, R.drawable.ontwerpje1,R.drawable.ontwerpje2, R.drawable.relation1,
 R.drawable.relation2, R.drawable.renaissance, R.drawable.renaissance_zoom };
		public ImageAdapter(Context context)
			{
				this._context = context;

			}

		@Override
		public int getCount()
			{
				return imageIds.length;
			}

		@Override
		public Object getItem(int index)
			{
				return imageIds[index];
			}

		@Override
		public long getItemId(int index)
			{
				return index;
			}

		@Override
		public View getView(int postion, View view, ViewGroup group)
			{
				ImageView imageView = new ImageView(_context);
				imageView.setImageResource(imageIds[postion]);
				imageView.setScaleType(ScaleType.FIT_XY);
				imageView.setLayoutParams(new Gallery.LayoutParams(400, 400));
				return imageView;
			}
	}

The result is shown here.

Download:

The source code for this project is in the Android Cookbook repository, http://github.com/IanDarwin/Android-Cookbook-Examples/,in the subdirectory HoneycombGallery.