gridview布局

item配件布局

主Activity

package com.su.testgrid3;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemLongClickListener;import android.widget.GridView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class TestGrid3Activity extends Activity {	private GridView gridView;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);				String[] titles = FileUtil.getImageNames("/mnt/sdcard/k/");		String[] imagePaths = new String[titles.length];		for (int i = 0; i < titles.length; i++) {			imagePaths[i]="/mnt/sdcard/k/"+titles[i];		}				gridView = (GridView) findViewById(R.id.gridview);		PictureAdapter adapter = new PictureAdapter(titles, imagePaths, this);		gridView.setAdapter(adapter);		gridView.setOnItemClickListener(new OnItemClickListener() {			public void onItemClick(AdapterView
     parent, View v,					int position, long id) {				Toast.makeText(TestGrid3Activity.this, "你点击了" + (position + 1),						Toast.LENGTH_SHORT).show();			}		});				gridView.setOnItemLongClickListener(new OnItemLongClickListener(){			public boolean onItemLongClick(AdapterView
     parent, View v,					int position, long id) {				Toast.makeText(TestGrid3Activity.this, "你长按了" + (position + 1),						Toast.LENGTH_SHORT).show();				return true;				/*				 * 这里需要true				 * 因为:OnItemLongClick事件中：down事件返回值标记此次事				 * 件是否为点击事件（返回false，是点击事件；返回true，不记为点击事件），				 * 而up事件标记此次事件结束时间，也就是判断是否为长按。				 */							}					});	}}

适配器

// 2012-4-18下午07:46:57package com.su.testgrid3;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.graphics.BitmapFactory;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;//自定义适配器class PictureAdapter extends BaseAdapter {	private LayoutInflater inflater;	private List
    
      pictures;	public PictureAdapter(String[] titles, String[] images, Context context) {		super();		pictures = new ArrayList
     
      ();		inflater = LayoutInflater.from(context);		for (int i = 0; i < images.length; i++) {			Picture picture = new Picture(titles[i], images[i]);			pictures.add(picture);		}	}	@Override	public int getCount() {		if (null != pictures) {			return pictures.size();		} else {			return 0;		}	}	@Override	public Object getItem(int position) {		return pictures.get(position);	}	@Override	public long getItemId(int position) {		return position;	}	@Override	public View getView(int position, View convertView, ViewGroup parent) {		ViewHolder viewHolder;		if (convertView == null) {			convertView = inflater.inflate(R.layout.picture_item, null);			viewHolder = new ViewHolder();			viewHolder.title = (TextView) convertView.findViewById(R.id.title);			viewHolder.image = (ImageView) convertView.findViewById(R.id.image);			convertView.setTag(viewHolder);		} else {			viewHolder = (ViewHolder) convertView.getTag();		}		viewHolder.title.setText(pictures.get(position).getTitle());		viewHolder.image.setImageBitmap(BitmapFactory.decodeFile(pictures.get(				position).getImageId()));		return convertView;	}}class ViewHolder {	public TextView title;	public ImageView image;}
     
    

picture的javabean

 

// 2012-4-18下午07:47:44package com.su.testgrid3;class Picture {	private String title;	private String imageId;	public Picture() {		super();	}	public Picture(String title, String imageId) {		super();		this.title = title;		this.imageId = imageId;	}	public String getTitle() {		return title;	}	public void setTitle(String title) {		this.title = title;	}	public String getImageId() {		return imageId;	}	public void setImageId(String imageId) {		this.imageId = imageId;	}}

获取图片文件的名字数组的操作类

// 2012-4-18下午07:49:44 package com.su.testgrid3;import java.io.File;public class FileUtil {	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;		}	}}