Android 程式开发：（十四）显示图像 —— 14.1 Gallery和ImageView

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。
 
[html] 
<?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。
 
[html] 
<?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。
 
[java] 
public class GalleryActivity extends Activity {  
    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(); 
                 
                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; 
 &nb

补充：移动开发 , Android ,