Android遍历某个文件夹的图片并实现滑动查看的的Gallery

package com.su.houses.utils;

import android.content.Context;
import android.content.res.TypedArray;
import android.net.Uri;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

import com.su.houses.R;

public class ImageAdapter extends BaseAdapter {
	private Context mContext;
	public String picpath;
	private String[] myImageNames;

	public ImageAdapter(Context c, String path) {

		mContext = c;
		picpath = path;

		myImageNames = FileUtil.getImageNames(picpath);

	}

	public int getCount() {

		return myImageNames.length;
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	public View getView(int position, View convertView, ViewGroup parent) {

		ImageView imageView = new ImageView(mContext);
		imageView.setImageURI(Uri.parse(picpath + "/" + myImageNames[position]));
		imageView.setLayoutParams(new Gallery.LayoutParams(800, 600));
		imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

		return imageView;
	}

}

public static String[] getImageNames(String folderPath) {
		File file01 = new File(folderPath);

		String[] files01 = file01.list();

		int imageFileNums = 0;
		for (int i = 0; i < files01.length; i++) {
			File file02 = new File(folderPath + "/" + files01[i]);

			if (!file02.isDirectory()) {

				if (isImageFile(file02.getName())) {

					imageFileNums++;
				}
			}
		}

		String[] files02 = new String[imageFileNums];

		int j = 0;
		for (int i = 0; i < files01.length; i++) {
			File file02 = new File(folderPath + "/" + files01[i]);

			if (!file02.isDirectory()) {

				if (isImageFile(file02.getName())) {
					files02[j] = file02.getName();
					j++;
				}
			}
		}
		return files02;
	}

	private static boolean isImageFile(String fileName) {
		String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
				fileName.length());
		if (fileEnd.equalsIgnoreCase("jpg")) {
			return true;
		} else if (fileEnd.equalsIgnoreCase("png")) {
			return true;
		} else if (fileEnd.equalsIgnoreCase("bmp")) {
			return true;
		} else {
			return false;
		}
	}

Gallery g = (Gallery) findViewById(R.id.house_gallery);
		g.setAdapter(new ImageAdapter(this,"/mnt/sdcard/k/a/"));

g.setOnItemSelectedListener(new OnItemSelectedListener()
		{
			// 选择图片的事件
			public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id)
			{
				// 获取当前图片文件名
				currentImageName = myImageNames[position];
				// 获取当前图片路径
				currentImagePath = currentFolderPath + "/" + currentImageName;
				// 设置imageSwitcher的显示图片
		   }

			public void onNothingSelected(AdapterView<?> arg0)
			{
				// TODO Auto-generated method stub
			}