遍历指定目录下的图片文件 显示在gridview

gridview布局

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;@Overridepublic 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 &lt; titles.length; i&#43;&#43;) {imagePaths[i]="/mnt/sdcard/k/"&#43;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&lt;?&gt; parent, View v,int position, long id) {Toast.makeText(TestGrid3Activity.this, "你点击了" &#43; (position &#43; 1),Toast.LENGTH_SHORT).show();}});gridView.setOnItemLongClickListener(new OnItemLongClickListener(){public boolean onItemLongClick(AdapterView&lt;?&gt; parent, View v,int position, long id) {Toast.makeText(TestGrid3Activity.this, "你长按了" &#43; (position &#43; 1),Toast.LENGTH_SHORT).show();return true;/* * 这里需要true * 因为:OnItemLongClick事件中：down事件返回&#20540;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。 */}});}}</pre>适配器<p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><pre style="font-size:12px; line-height:18px">// 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&lt;Picture&gt; pictures;public PictureAdapter(String[] titles, String[] images, Context context) {super();pictures = new ArrayList&lt;Picture&gt;();inflater = LayoutInflater.from(context);for (int i = 0; i &lt; images.length; i&#43;&#43;) {Picture picture = new Picture(titles[i], images[i]);pictures.add(picture);}}@Overridepublic int getCount() {if (null != pictures) {return pictures.size();} else {return 0;}}@Overridepublic Object getItem(int position) {return pictures.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic 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;}</pre><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px">picture的javabean</p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"> </p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><pre style="font-size:12px; line-height:18px">// 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;}}</pre><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px">获取图片文件的名字数组的操作类</p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><pre style="font-size:12px; line-height:18px">// 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 &lt; files01.length; i&#43;&#43;) {File file02 = new File(folderPath &#43; "/" &#43; files01[i]);if (!file02.isDirectory()) {if (isImageFile(file02.getName())) {imageFileNums&#43;&#43;;}}}String[] files02 = new String[imageFileNums];int j = 0;for (int i = 0; i &lt; files01.length; i&#43;&#43;) {File file02 = new File(folderPath &#43; "/" &#43; files01[i]);if (!file02.isDirectory()) {if (isImageFile(file02.getName())) {files02[j] = file02.getName();j&#43;&#43;;}}}return files02;}private static boolean isImageFile(String fileName) {String fileEnd = fileName.substring(fileName.lastIndexOf(".") &#43; 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;}}}</pre><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"></p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"> </p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"> </p><p style="margin-top:5px; margin-bottom:5px; font-family:'sans serif',tahoma,verdana,helvetica; font-size:12px; line-height:18px"> <img style="max-width: 100%;height: auto;width: auto\9;" src="//img.reader8.net/uploadfile/jiaocheng/2014017/1424/2014011402240918895.jpg" alt="遍历指定索引下的图片文件 显示在gridview"></p> </p></div><div style="margin:0 auto;width:300px;height:250px;position:relative;"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <!-- 移动端全站正文 --> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-6147101717324856" data-ad-slot="1958144088" data-ad-format="auto"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <div class="subn-nav"><a href="//m.reader8.net">读书人网</a> ><a href="//m.reader8.net/jiaocheng/yidongkfa/">移动开发</a></div><div class="sp-jctu"><h3><span> 热点推荐 </span></h3><ul><li><p><a href="//m.reader8.net/jiaocheng/20130906/1400173.html">20款移动开发框架平台介绍</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20130906/1391611.html">微信公众平台如何保证access_token长期</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140426/2314936.html">中国城市列表相仿手机通讯录显示方式</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140426/2314935.html">Socket连接与HTTP联接</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140425/2313936.html">平添wifi定位功能</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140425/2313935.html">偷空写了两个游戏</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140424/2313088.html">java集合类 - 实现 细节</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140424/2313087.html">hidden visible display 的差别</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140423/2311956.html">春节前最后一个：立地群飞</a></p></li> <li><p><a href="//m.reader8.net/jiaocheng/20140423/2311955.html">64位 与32 位 差异</a></p></li> </ul></div><div style="display:none;"> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "//hm.baidu.com/hm.js?d6151f323a57d16696165e47eee86d53"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script></div> <div class="footer"><p>触屏版 | <a href="//www.reader8.net/jiaocheng/20120624/1390597.html#fromapp">电脑版</a></p><p>读书人网 m.reader8.net</p></div> <script language="javascript"> function clickme(sad){ var divobjdiv = document.getElementById("divobjdiv" + sad); if(divobjdiv.style.display =="none"){ divobjdiv.style.display ="block"; }else{ divobjdiv.style.display ="none"; } var wenzi = document.getElementById('divobjimg' + sad); if(wenzi.innerText == "收起"){ wenzi.innerText = "查看更多"; }else{ wenzi.innerText = "收起"; } } </script> <div id="back-top"><a href="#top"><span></span></a></div> </body> </html>