android 显示目录下图片

package com.test.gridview;

import android.os.Environment;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* Created by 1 on 2016/4/17.
*/
public class FileUtils {

public static String[] imageFormatSet = {"jpg", "png", "gif"};

public static String SDPATH = Environment.getExternalStorageDirectory() + "/00Meeting/";

public static String IMAGE_NAME = "imageName";

public static String IMAGE_PATH = "imagePath";

/**
* 判断是否是图片文件
*
* @param path
* @return
*/
public static boolean isImageFile(String path) {
for (String format : imageFormatSet) {

if (path.endsWith(format)) {
return true;
}
}
return false;
}

public static List<Map<String, String>> getFiles(String path) {

List<Map<String, String>> pathList = new ArrayList<>();

File file = new File(path);
File[] files = file.listFiles();
for (File f : files) {
if (f.isDirectory()) {
getFiles(f.getAbsolutePath());
} else {
if (isImageFile(f.getPath())) {
Map<String, String> map = new HashMap<>();
map.put(FileUtils.IMAGE_NAME, f.getName());
map.put(FileUtils.IMAGE_PATH, f.getPath());
pathList.add(map);

}
}
}
return pathList;
}
}