android開(kāi)發(fā)和Java開(kāi)發(fā)差不了多少，也會(huì)有許多相同的功能。像本文提到的文件存儲(chǔ)，在Java項(xiàng)目和android項(xiàng)目里面用到都是相同的。只是android開(kāi)發(fā)的一些路徑做了相應(yīng)的處理。

下面就是在項(xiàng)目中用到的一個(gè)文件存儲(chǔ)和讀取類(lèi)。

import java.io.File; import java.io.FileOutputStream; import java.io.IOException;import android.content.Context; import android.os.Environment; import android.text.TextUtils;/*** 文件工具類(lèi)* * @version v 1.0.0 2015-8-22 下午10:21:03 xl Exp $*/ public class FileUtils {public File ImgCachePath;public File ImgSavePath;public File ImgSharePath;public File ApkSavePath;public File LogSavePath;public File ImgCapTempPath;public File ImgCapCutPath;public File ImgCacheDefaultPath;public static String APP_DATA_ROOT_PATH;public static String IMG_SAVE_PATH;public static String IMG_SHARE_PATH;public static String APK_INSTALL_PATH;public static String APK_LOG_PATH;public static String IMG_SAVE_PATH_CAP_TEMP;public static String IMG_SAVE_PATH_CAP_CUT;public static String IMG_CACHE_XUTILS_SDCARD_PATH;public static String IMG_CACHE_XUTILS_DEFAULT_PATH;public static String FINAL_IMAGE_PATH;public static String FINAL_TEMP_PATH;public static String SDPATH;public File XLPath;public Context mContext;private static FileUtils mInstance;public FileUtils(Context context) {mContext = context;}/*** 創(chuàng)建文件工具類(lèi)示例* * @param context* 上下文* @return*/public static synchronized FileUtils createInstance(Context context) {if (mInstance == null) {mInstance = new FileUtils(context);mInstance.initPath();}return mInstance;}/*** 獲取文件工具類(lèi)實(shí)例* * @return*/public static synchronized FileUtils getInstance() {if (mInstance == null)throw new IllegalStateException("FileUtil must be create by call createInstance(Context context)");return mInstance;}/*** 初始化本地緩存路徑*/public void initPath() {if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {SDPATH = Environment.getExternalStorageDirectory() + "/";IMG_SAVE_PATH = SDPATH + "**/images/save/";IMG_SHARE_PATH = SDPATH + "**/images/share/";APK_INSTALL_PATH = SDPATH + "**/app/";APK_LOG_PATH = SDPATH + "**/log/";IMG_SAVE_PATH_CAP_TEMP = SDPATH + "**/images/save/capture/**_temp/";IMG_SAVE_PATH_CAP_CUT = SDPATH + "**/images/save/capture/**_cut/";IMG_CACHE_XUTILS_SDCARD_PATH = SDPATH + "**/images/cache/";// 用于保存圖片緩存吧IMG_CACHE_XUTILS_DEFAULT_PATH = SDPATH + "Android/data/" + mContext.getPackageName() + "/cache/imgCache/";APP_DATA_ROOT_PATH = getAppPath() + "**/";FINAL_IMAGE_PATH = APP_DATA_ROOT_PATH + "images/";FINAL_TEMP_PATH = APP_DATA_ROOT_PATH + "temp/";XLPath= new File(APP_DATA_ROOT_PATH);if (!**.exists()) {XLPath.mkdirs();}XLPath = new File(FINAL_IMAGE_PATH);if (!XLPath.exists()) {XLPath.mkdirs();}XLPath = new File(FINAL_TEMP_PATH);if (!XLPath.exists()) {XLPath.mkdirs();}// 拍照?qǐng)D片保存地址ImgCapTempPath = new File(IMG_SAVE_PATH_CAP_TEMP);if (!ImgCapTempPath.exists()) {ImgCapTempPath.mkdirs();}// 裁剪后圖片保存地址ImgCapCutPath = new File(IMG_SAVE_PATH_CAP_CUT);if (!ImgCapCutPath.exists()) {ImgCapCutPath.mkdirs();}// 圖片保存、緩存地址ImgSavePath = new File(IMG_SAVE_PATH);if (!ImgSavePath.exists()) {ImgSavePath.mkdirs();}// 分享圖片的臨時(shí)保存路徑ImgSharePath = new File(IMG_SHARE_PATH);if (!ImgSharePath.exists()) {ImgSharePath.mkdirs();}// 檢測(cè)更新時(shí)保存路徑ApkSavePath = new File(APK_INSTALL_PATH);if (!ApkSavePath.exists()) {ApkSavePath.mkdirs();}// 異常保存路徑LogSavePath = new File(APK_LOG_PATH);if (!LogSavePath.exists()) {LogSavePath.mkdirs();}ImgCachePath = new File(IMG_CACHE_XUTILS_SDCARD_PATH);if (!ImgCachePath.exists()) {ImgCachePath.mkdirs();}ImgCacheDefaultPath = new File(IMG_CACHE_XUTILS_DEFAULT_PATH);if (!ImgCacheDefaultPath.exists()) {ImgCacheDefaultPath.mkdirs();}}}private String getAppPath() {LogCatLog.i(TAG, "MyApplication-getAppPath():" + mContext.getFilesDir().getParent());return mContext.getFilesDir().getParent() + "/";}/*** [將文件保存到SDcard方法]<BR>* [功能詳細(xì)描述]* * @param fileName* @param inStream* @throws IOException*/public boolean saveFile2SDCard(String fileName, byte[] dataBytes) throws IOException {boolean flag = false;FileOutputStream fs = null;try {if (!TextUtils.isEmpty(fileName)) {File file = newFileWithPath(fileName.toString());if (file.exists()) {file.delete();LogCatLog.w(TAG, "httpFrame threadName:" + Thread.currentThread().getName() + " 文件已存在 則先刪除: "+ fileName.toString());}fs = new FileOutputStream(file);fs.write(dataBytes, 0, dataBytes.length);fs.flush();flag = true;}} catch (Exception e) {e.printStackTrace();} finally {if (fs != null)fs.close();}return flag;}/*** 創(chuàng)建一個(gè)文件，如果其所在目錄不存在時(shí)，他的目錄也會(huì)被跟著創(chuàng)建* * @author songdiyuan* @date 2015-8-24* @return*/public File newFileWithPath(String filePath) {if (TextUtils.isEmpty(filePath)) {return null;}int index = filePath.lastIndexOf(File.separator);String path = "";if (index != -1) {path = filePath.substring(0, index);if (!TextUtils.isEmpty(path)) {File file = new File(path.toString());// 如果文件夾不存在if (!file.exists() && !file.isDirectory()) {boolean flag = file.mkdirs();if (flag) {LogCatLog.i(TAG, "httpFrame threadName:" + Thread.currentThread().getName() + " 創(chuàng)建文件夾成功："+ file.getPath());} else {LogCatLog.e(TAG, "httpFrame threadName:" + Thread.currentThread().getName() + " 創(chuàng)建文件夾失敗："+ file.getPath());}}}}return new File(filePath);}/*** 判斷文件是否存在* * @param strPath* @return*/public boolean isExists(String strPath) {if (strPath == null) {return false;}final File strFile = new File(strPath);if (strFile.exists()) {return true;}return false;} }

?使用方法：① 判斷文件是否存在

?

/*** 保存獲取的 軟件信息，設(shè)備信息和出錯(cuò)信息保存在SDcard中* * @param context* @param ex* @return*/private String savaInfoToSD(Context context, Throwable ex) {String fileName = null;StringBuffer sb = new StringBuffer();for (Map.Entry<String, String> entry : obtainSimpleInfo(context).entrySet()) {String key = entry.getKey();String value = entry.getValue();sb.append(key).append(" = ").append(value).append("\n");}sb.append(obtainExceptionInfo(ex));try {fileName = FileUtils.APK_LOG_PATH+ paserTime(System.currentTimeMillis()) + ".log";FileOutputStream fos = new FileOutputStream(fileName);fos.write(sb.toString().getBytes());fos.flush();fos.close();} catch (Exception e) {e.printStackTrace();}return fileName;}

② 使用方法：往指定路徑下存儲(chǔ)文件

String fileName = "***" + " " + time + "[在這里輸入要存儲(chǔ)的文件類(lèi)型eg:.jpg/.pdf/.doc/.txt....]"; String path = FileUtils.APK_INSTALL_PATH + fileName; FileUtils.getInstance().saveFile2SDCard(path, ArchData);//由于該方法是將文件已二進(jìn)制數(shù)組的方式將數(shù)據(jù)存儲(chǔ)進(jìn)去，所以第二個(gè)參數(shù)里面是一個(gè)二進(jìn)制數(shù)組

?

這個(gè)工具類(lèi)里面還有其他的許多方法在工具類(lèi)里面都已經(jīng)進(jìn)行了注釋。

轉(zhuǎn)載于:https://www.cnblogs.com/BobAdmin/p/4983962.html

總結(jié)

以上是生活随笔為你收集整理的Android FileUtil(android文件工具类)的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。