Android之根据读取SD卡指定后缀名的文件

package com.TestView.layer;import java.io.File;import java.io.FilenameFilter;import android.app.Activity;import android.os.Environment;import android.widget.Toast;public class LayerListClass {Activity activity;private Toast toast;private File file;public LayerListClass(Activity activity) {this.activity = activity;}public String getFilesName() {file = new File(getLayerListBySdCard());if (!file.exists()) {showToast(getLayerListBySdCard() + "路径不存在");return null;}File[] files = file.listFiles(new FilenameFilter() {public boolean accept(File dir, String filename) {return filename.endsWith(".tpk");}});String aa = "";for (int i = 0; i < files.length; i++) {aa += files[i].getName() + "---->>";}showToast(aa);return aa;}private String getLayerListBySdCard() {if (!isSdCardExist()) {showToast("SD卡不存在");return null;}String sdpath = getSdCardPath();return sdpath;}/** * 1、判断SD卡是否存在 *  * @return */private boolean isSdCardExist() {boolean isExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);return isExist;}/** * 2、获取SD卡目录 *  * @return */private String getSdCardPath() {String sdpath = "";sdpath = Environment.getExternalStorageDirectory().toString();sdpath = sdpath + "/ArcGIS";return sdpath;}/** * 显示Toast内容 *  * @param msg */private void showToast(String msg) {if (toast == null) {toast = Toast.makeText(activity, msg, Toast.LENGTH_SHORT);} else {toast.setText(msg);}toast.show();}}