创建一个工具类 ：FileUtil

package com.example.testUtil;import java.io.File;
//从本地读取图片
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;}}}
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然后在我们的主方法中去调用：

String[] titles = FileUtil.getImageNames("/mnt/sdcard/lzlpicture/87-32101010/"); //图片名称
String[] imagePaths = new String[titles.length];   // 存储图片的数组for (int i = 0; i < titles.length; i++) {imagePaths[i] = "/mnt/sdcard/lzlpicture/87-32101010/" + titles[i];
}
mImage.setImageBitmap(BitmapFactory.decodeFile(imagePaths[1]));  //图片就能显示到Imageview上了
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千万不能忘记添加我们的权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />复制代码