GridView兑现一行显示并左右滚动

使用GridView达到Gallery效果

<?xml version="1.0" encoding="utf-8"?>
<!-- res/layout/gridview_to_gallery.xml -->
<HorizontalScrollView  xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="none">
        <LinearLayout 
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" 
            android:orientation="horizontal">
	        <GridView android:id="@+id/grid"
	        	android:layout_width="1300dp"
	        	android:layout_height="fill_parent"
	        	android:gravity="center"
	        	android:columnWidth="100dip"
	        	android:horizontalSpacing="10dip"
	        	android:verticalSpacing="10dip"/>
        </LinearLayout>
</HorizontalScrollView>

public class GridViewDemo extends Activity {
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gridview_to_gallery);
        
        GridView gridview = (GridView) findViewById(R.id.grid);
        ImageAdapter adapter = new ImageAdapter(this);//一个继承BaseAdapter的自定义适配器
        adapter.setImages(getImages());
        gridview.setAdapter(adapter);
        gridview.setNumColumns(adapter.getCount());

        gridview.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> av, View v, int position, long id) {
				Toast.makeText(GridViewDemo.this, "" + position, Toast.LENGTH_SHORT).show();
			}
        });
	}
	/**
	 * 取出SD卡中的图片（也可改为取网络或数据库图片）
	 * @return
	 */
	private List<Bitmap> getImages() {
		List<Bitmap> list = new ArrayList<Bitmap>();
		for (int i=1; i<=12; i++) {
			String imagePath = "/sdcard/image_0"+i+".jpg";
			if (i >= 10) imagePath = "/sdcard/image_"+i+".jpg";
			list.add(BitmapFactory.decodeFile(imagePath));
		}
		return list;
	}
}

自定义适配器

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private List<Bitmap> images = new ArrayList<Bitmap>();

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public List<Bitmap> getImages() {
		return images;
	}
	public void setImages(List<Bitmap> images) {
		this.images = images;
	}

	public int getCount() {
        return images.size();
    }

    public Object getItem(int position) {
        return images.get(position);
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageBitmap(images.get(position));
        return imageView;
    }
}