Gallery可以显示一系列的图片，并且可以横向滑动。下面展示如何使用Gallery去显示一系列的图片。
1. 创建一个工程，Gallery。
2. main.xml中的代码。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Images of San Francisco" /> <Gallery android:id="@+id/gallery1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <ImageView android:id="@+id/image1" android:layout_width="320dp" android:layout_height="250dp" android:scaleType="fitXY" /> </LinearLayout>3. 在res/values文件夹下面新建一个文件，attrs.xml。4. attrs.xml中的代码。
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="Gallery1"> <attr name="android:galleryItemBackground" /> </declare-styleable> </resources>5. 准备一些图片。将这些图片放在res/drawable-mdpi下面。
6. GalleryActivity.java中的代码。
public class GalleryActivity extends Activity { // 保存图片的id Integer[] imageIDs = { R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4, R.drawable.pic5, R.drawable.pic6, R.drawable.pic7 }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Gallery gallery = (Gallery) findViewById(R.id.gallery1); gallery.setAdapter(new ImageAdapter(this)); gallery.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(getBaseContext(), "pic" + (position + 1) + " selected", Toast.LENGTH_SHORT).show(); // 显示被选中的图片 ImageView imageView = (ImageView) findViewById(R.id.image1); imageView.setImageResource(imageIDs[position]); } }); } public class ImageAdapter extends BaseAdapter { Context context; int itemBackground; public ImageAdapter(Context c) { context = c; //---setting the style--- TypedArray a = obtainStyledAttributes(R.styleable.Gallery1); itemBackground = a.getResourceId( R.styleable.Gallery1_android_galleryItemBackground, 0); a.recycle(); } //---returns the number of images--- public int getCount() { return imageIDs.length; } //---returns the item--- public Object getItem(int position) { return position; } //---returns the ID of an item--- public long getItemId(int position) { return position; } //---returns an ImageView view--- public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(context); imageView.setImageResource(imageIDs[position]); imageView.setScaleType(ImageView.ScaleType.FIT_XY); imageView.setLayoutParams(new Gallery.LayoutParams(150, 120)); } else { imageView = (ImageView) convertView; } imageView.setBackgroundResource(itemBackground); return imageView; } } }7. 按F11在模拟器上面调试。会看见一系列的图片，这些图片可以左右滑动。当单击单个图片的时候，会弹出消息。
首先，我们在main.xml中添加Gallery和ImageView控件：
<Gallery android:id="@+id/gallery1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <ImageView android:id="@+id/image1" android:layout_width="320dp" android:layout_height="250dp" android:scaleType="fitXY" />前面已经提到过，Gallery用来显示一系列的图片，ImageView用来显示被选中的图片。这些图片的id被保存在imageIDs数组中：
Integer[] imageIDs = { R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4, R.drawable.pic5, R.drawable.pic6, R.drawable.pic7 };接下来创建BaseAdapter的子类：ImageAdapter，这样一来，我们就能把Gallery与图片资源绑定在一起了。这个适配器起到了桥梁的作用。使用BaseAdapter的视图的还有：
- ListView
- GridView
- Spinner
- Gallery
BaseAdapter也有一些子类：
- ListAdapter
- ArrayAdapter
- CursorAdapter
- SpinnerAdapter
在ImageAdapter中我们主要实现以下的方法：
public class ImageAdapter extends BaseAdapter { Context context; int itemBackground; public ImageAdapter(Context c) { context = c; //---setting the style--- TypedArray a = obtainStyledAttributes(R.styleable.Gallery1); itemBackground = a.getResourceId( R.styleable.Gallery1_android_galleryItemBackground, 0); a.recycle(); } //---returns the number of images--- public int getCount() { return imageIDs.length; } //---returns the item--- public Object getItem(int position) { return position; } //---returns the ID of an item--- public long getItemId(int position) { return position; } //---returns an ImageView view--- public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(context); imageView.setImageResource(imageIDs[position]); imageView.setScaleType(ImageView.ScaleType.FIT_XY); imageView.setLayoutParams(new Gallery.LayoutParams(150, 120)); } else { imageView = (ImageView) convertView; } imageView.setBackgroundResource(itemBackground); return imageView; } }