操作内存卡的常用代码

1.操作权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.DELETE_CACHE_FILES" />

2.获取文件保存路径

// 获取保存路径public File getFilePath() {File filePath = null;//判断SD卡存在与否if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {filePath = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+ "/A_Test/test/");if (!filePath.isDirectory()) {//判断文件存在与否，不存在就创建filePath.mkdirs();}} else {Toast.makeText(Main.this, "存储卡不存在，请插入卡!", 3000).show();}return filePath;}

3.获取图片保存路径

// 获得SD的路径public String getSDPath() {File sdPath = null;if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) { // sd卡存在sdPath = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+ File.separator + "mobileoa" + File.separator + "photo");// 获得路径// sdPath = new File(Environment.getExternalStorageDirectory()// .getAbsolutePath());// 获得根路径}return sdPath != null ? sdPath.toString() : "内存卡不存在！";}// 获得SDCard下图片的路径private List<String> getSDCard() {imagePaths = new ArrayList<String>();try {File file = new File(getSDPath());File[] files = file.listFiles();for (File theFile : files) {if (isImageFile(theFile.getPath())) {imagePaths.add(theFile.getPath());}}} catch (Exception e) {return imagePaths;}return imagePaths;}// 判断是否是图片文件private boolean isImageFile(String fileName) {String extension = fileName.substring(fileName.lastIndexOf(".") + 1,fileName.length()).toLowerCase();if (extension.equals("jpg") || extension.equals("png")|| extension.equals("gif") || extension.equals("jpeg")|| extension.equals("bmp")) {return true;}return false;}

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