Programming Tutorials

package com.javasamples;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class GalleryDemo extends Activity {


	TextView mySelection;
	Gallery myGallery;
	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.main);
		mySelection = (TextView) findViewById(R.id.mySelection);		
		
		// Bind the gallery defined in the main.xml
		// Apply a new (customized) ImageAdapter to it.

		myGallery = (Gallery) findViewById(R.id.myGallery);

		myGallery.setAdapter(new ImageAdapter(this));
		
		myGallery.setOnItemSelectedListener(new OnItemSelectedListener() {

			public void onItemSelected(AdapterView<?> parent, View v,
					int position, long id) {
				mySelection.setText(" selected option: " + position );
				
			}

			public void onNothingSelected(AdapterView<?> parent) {
				mySelection.setText("Nothing selected");
				
			}


		});
	}// onCreate

	public class ImageAdapter extends BaseAdapter {
		/** The parent context */
		private Context myContext;
		// Put some images to project-folder: /res/drawable/
		// format: jpg, gif, png, bmp, ...
		private int[] myImageIds = { R.drawable.image1, R.drawable.image2,
				       R.drawable.image3, R.drawable.mbl1 };

		/** Simple Constructor saving the 'parent' context. */
		public ImageAdapter(Context c) {
			this.myContext = c;
		}

		// inherited abstract methods - must be implemented
		// Returns count of images, and individual IDs
		public int getCount() {
			return this.myImageIds.length;
		}

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

		public long getItemId(int position) {
			return position;
		}
		// Returns a new ImageView to be displayed,
		public View getView(int position, View convertView, 
				ViewGroup parent) {

			// Get a View to display image data 					
			ImageView iv = new ImageView(this.myContext);
			iv.setImageResource(this.myImageIds[position]);

			// Image should be scaled somehow
			//iv.setScaleType(ImageView.ScaleType.CENTER);
			//iv.setScaleType(ImageView.ScaleType.CENTER_CROP);			
			//iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
			//iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
			//iv.setScaleType(ImageView.ScaleType.FIT_XY);
			iv.setScaleType(ImageView.ScaleType.FIT_END);
			
			// Set the Width & Height of the individual images
			iv.setLayoutParams(new Gallery.LayoutParams(95, 70));

			return iv;
		}
	}// ImageAdapter
}// AndDemoUI

<?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" 
    > 
<TextView   
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="SDK1.5  /samples/.../view/Gallery1.java" 
    />
    <TextView  
    android:id="@+id/mySelection" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:background="#ff0000ff"
    android:textSize="20px" android:textStyle="bold"/>  
<Gallery 
        android:id="@+id/myGallery" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:gravity="bottom" 
        
/> 
</LinearLayout>