package net.micode.fileexplorer.util;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashSet;import net.micode.fileexplorer.FileViewActivity;
import net.micode.fileexplorer.GlobalConsts;
import net.micode.fileexplorer.R;
import net.micode.fileexplorer.model.FavoriteItem;
import net.micode.fileexplorer.model.FileInfo;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Environment;
import android.util.Log;
import android.view.ActionMode;
import android.view.View;
import android.widget.TextView;
/**工具类，包含了很多通用的工具方法，被项目中的很多类调用。*/
public class Util {//这个文件夹里面存储的内容是app2sd产生的文件夹，也就是是你手机上所有安装到SD卡的应用程序的缓存文件夹。//androidsecure文件夹可以删除吗？//如果删除之后，软件不能正常使用，和系统没有关系。//删的话除了会可能导致移动至sd卡的程序损坏，数据丢失，并不会造成什么严重后果。只要把移动到sd卡的损坏程序卸载，重装，手机就完全没有损伤，文件夹也会在再次app2sd时自动重建的。private static String ANDROID_SECURE = "/mnt/sdcard/.android_secure";//android.util.Log.log第1个参数，用到“tag”，和log4j中Logger.getLogger(getClass())用法不太一样private static final String LOG_TAG = "Util";//获得SD卡的存储状态，“mounted”表示已经就绪public static boolean isSDCardReady() {return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);}// if path1 contains path2public static boolean containsPath(String path1, String path2) {String path = path2;while (path != null) {if (path.equalsIgnoreCase(path1))return true;if (path.equals(GlobalConsts.ROOT_PATH))break;path = new File(path).getParent();}return false;}//2个路径相加的时候，是否需要加上文件分隔符public static String makePath(String path1, String path2) {if (path1.endsWith(File.separator))return path1 + path2;return path1 + File.separator + path2;}//获得SD卡的存储目录public static String getSdDirectory() {return Environment.getExternalStorageDirectory().getPath();}//判断1个文件是否为“普通文件”，ANDROID_SECURE下的文件都不是普通的public static boolean isNormalFile(String fullName) {return !fullName.equals(ANDROID_SECURE);}//根据文件路径，获得Java文件File，再包装成FileInfopublic static FileInfo GetFileInfo(String filePath) {File lFile = new File(filePath);if (!lFile.exists())return null;FileInfo lFileInfo = new FileInfo();lFileInfo.canRead = lFile.canRead();lFileInfo.canWrite = lFile.canWrite();lFileInfo.isHidden = lFile.isHidden();lFileInfo.fileName = Util.getNameFromFilepath(filePath);lFileInfo.ModifiedDate = lFile.lastModified();lFileInfo.IsDir = lFile.isDirectory();lFileInfo.filePath = filePath;lFileInfo.fileSize = lFile.length();return lFileInfo;}//根据File对象，和FilenameFilter等选项，获得包装的FileInfo//需要注意多少，如果File是个目录，Count就是当前目录下的文件的个数。如果是普通文件，就计算文件大小。//这个时候，我们知道Count字段的含义了public static FileInfo GetFileInfo(File f, FilenameFilter filter,boolean showHidden) {FileInfo lFileInfo = new FileInfo();String filePath = f.getPath();File lFile = new File(filePath);lFileInfo.canRead = lFile.canRead();lFileInfo.canWrite = lFile.canWrite();lFileInfo.isHidden = lFile.isHidden();lFileInfo.fileName = f.getName();lFileInfo.ModifiedDate = lFile.lastModified();lFileInfo.IsDir = lFile.isDirectory();lFileInfo.filePath = filePath;if (lFileInfo.IsDir) {int lCount = 0;File[] files = lFile.listFiles(filter);// null means we cannot access this dirif (files == null) {return null;}for (File child : files) {if ((!child.isHidden() || showHidden)&& Util.isNormalFile(child.getAbsolutePath())) {lCount++;}}lFileInfo.Count = lCount;} else {lFileInfo.fileSize = lFile.length();}return lFileInfo;}/** 采用了新的办法获取APK图标，之前的失败是因为android中存在的一个BUG,通过 appInfo.publicSourceDir =* apkPath;来修正这个问题，详情参见:* http://code.google.com/p/android/issues/detail?id=9151*/public static Drawable getApkIcon(Context context, String apkPath) {//Android系统为我们提供了很多服务管理类，包括ActivityManager、PowerManager(电源管理)、AudioManager(音频管理)。//PackageManager主要是管理应用程序包，通过它就可以获取应用程序信息PackageManager pm = context.getPackageManager();PackageInfo info = pm.getPackageArchiveInfo(apkPath,PackageManager.GET_ACTIVITIES);if (info != null) {ApplicationInfo appInfo = info.applicationInfo;appInfo.sourceDir = apkPath;appInfo.publicSourceDir = apkPath;try {return appInfo.loadIcon(pm);} catch (OutOfMemoryError e) {Log.e(LOG_TAG, e.toString());}}return null;}//获得文件的扩展名public static String getExtFromFilename(String filename) {int dotPosition = filename.lastIndexOf('.');if (dotPosition != -1) {return filename.substring(dotPosition + 1, filename.length());}return "";}//获得去掉“文件后缀”的文件名字，比如“C:/a/b/c.png”，输出“C:/a/b/c”public static String getNameFromFilename(String filename) {int dotPosition = filename.lastIndexOf('.');if (dotPosition != -1) {return filename.substring(0, dotPosition);}return "";}//从文件路径中，获得路径public static String getPathFromFilepath(String filepath) {int pos = filepath.lastIndexOf('/');if (pos != -1) {return filepath.substring(0, pos);}return "";}//从文件路径中，获得文件名（带后缀，如果有）public static String getNameFromFilepath(String filepath) {int pos = filepath.lastIndexOf('/');if (pos != -1) {return filepath.substring(pos + 1);}return "";}// return new file path if successful, or return nullpublic static String copyFile(String src, String dest) {File file = new File(src);if (!file.exists() || file.isDirectory()) {Log.v(LOG_TAG, "copyFile: file not exist or is directory, " + src);return null;}FileInputStream fi = null;FileOutputStream fo = null;try {fi = new FileInputStream(file);File destPlace = new File(dest);if (!destPlace.exists()) {if (!destPlace.mkdirs())return null;}String destPath = Util.makePath(dest, file.getName());File destFile = new File(destPath);int i = 1;while (destFile.exists()) {String destName = Util.getNameFromFilename(file.getName())+ " " + i++ + "."+ Util.getExtFromFilename(file.getName());destPath = Util.makePath(dest, destName);destFile = new File(destPath);}if (!destFile.createNewFile())return null;fo = new FileOutputStream(destFile);int count = 102400;byte[] buffer = new byte[count];int read = 0;while ((read = fi.read(buffer, 0, count)) != -1) {fo.write(buffer, 0, read);}// TODO: set access privilegereturn destPath;} catch (FileNotFoundException e) {Log.e(LOG_TAG, "copyFile: file not found, " + src);e.printStackTrace();} catch (IOException e) {Log.e(LOG_TAG, "copyFile: " + e.toString());} finally {try {if (fi != null)fi.close();if (fo != null)fo.close();} catch (IOException e) {e.printStackTrace();}}return null;}// does not include sd card folderprivate static String[] SysFileDirs = new String[] { "miren_browser/imagecaches" };//判断一个文件是否需要显示，根据Setting中的设置。特别说明：某个系统文件目录，不显示。public static boolean shouldShowFile(String path) {return shouldShowFile(new File(path));}//判断一个文件是否需要显示，根据Setting中的设置。特别说明：某个系统文件目录，不显示。public static boolean shouldShowFile(File file) {boolean show = Settings.instance().getShowDotAndHiddenFiles();if (show)return true;if (file.isHidden())return false;if (file.getName().startsWith("."))return false;String sdFolder = getSdDirectory();for (String s : SysFileDirs) {if (file.getPath().startsWith(makePath(sdFolder, s)))return false;}return true;}//根据上下文对象Context，获得默认的收藏集合public static ArrayList<FavoriteItem> getDefaultFavorites(Context context) {ArrayList<FavoriteItem> list = new ArrayList<FavoriteItem>();list.add(new FavoriteItem(context.getString(R.string.favorite_photo),makePath(getSdDirectory(), "DCIM/Camera")));list.add(new FavoriteItem(context.getString(R.string.favorite_sdcard),getSdDirectory()));// list.add(new FavoriteItem(context.getString(R.string.favorite_root),// getSdDirectory()));list.add(new FavoriteItem(context.getString(R.string.favorite_screen_cap), makePath(getSdDirectory(), "MIUI/screen_cap")));list.add(new FavoriteItem(context.getString(R.string.favorite_ringtone), makePath(getSdDirectory(), "MIUI/ringtone")));return list;}//向View中的某个TextView设置文本public static boolean setText(View view, int id, String text) {TextView textView = (TextView) view.findViewById(id);if (textView == null)return false;textView.setText(text);return true;}//向View中的某个TextView设置文本public static boolean setText(View view, int id, int text) {TextView textView = (TextView) view.findViewById(id);if (textView == null)return false;textView.setText(text);return true;}// comma separated numberpublic static String convertNumber(long number) {return String.format("%,d", number);}// storage, G M K Bpublic static String convertStorage(long size) {long kb = 1024;long mb = kb * 1024;long gb = mb * 1024;if (size >= gb) {return String.format("%.1f GB", (float) size / gb);} else if (size >= mb) {float f = (float) size / mb;return String.format(f > 100 ? "%.0f MB" : "%.1f MB", f);} else if (size >= kb) {float f = (float) size / kb;return String.format(f > 100 ? "%.0f KB" : "%.1f KB", f);} elsereturn String.format("%d B", size);}public static class SDCardInfo {public long total;public long free;}//获得SD卡的各种信息，总容量大小和剩余容量大小等public static SDCardInfo getSDCardInfo() {String sDcString = android.os.Environment.getExternalStorageState();if (sDcString.equals(android.os.Environment.MEDIA_MOUNTED)) {File pathFile = android.os.Environment.getExternalStorageDirectory();try {android.os.StatFs statfs = new android.os.StatFs(pathFile.getPath());// 获取SDCard上BLOCK总数long nTotalBlocks = statfs.getBlockCount();// 获取SDCard上每个block的SIZElong nBlocSize = statfs.getBlockSize();// 获取可供程序使用的Block的数量long nAvailaBlock = statfs.getAvailableBlocks();// 获取剩下的所有Block的数量(包括预留的一般程序无法使用的块)long nFreeBlock = statfs.getFreeBlocks();SDCardInfo info = new SDCardInfo();// 计算SDCard 总容量大小MBinfo.total = nTotalBlocks * nBlocSize;// 计算 SDCard 剩余大小MBinfo.free = nAvailaBlock * nBlocSize;return info;} catch (IllegalArgumentException e) {Log.e(LOG_TAG, e.toString());}}return null;}//显示一条系统通知public static void showNotification(Context context, Intent intent,String title, String body, int drawableId) {NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);Notification notification = new Notification(drawableId, body,System.currentTimeMillis());notification.flags = Notification.FLAG_AUTO_CANCEL;notification.defaults = Notification.DEFAULT_SOUND;if (intent == null) {// FIXEME: category tab is disabledintent = new Intent(context, FileViewActivity.class);}PendingIntent contentIntent = PendingIntent.getActivity(context, 0,intent, PendingIntent.FLAG_ONE_SHOT);notification.setLatestEventInfo(context, title, body, contentIntent);manager.notify(drawableId, notification);}//格式化毫秒格式的时间public static String formatDateString(Context context, long time) {DateFormat dateFormat = android.text.format.DateFormat.getDateFormat(context);DateFormat timeFormat = android.text.format.DateFormat.getTimeFormat(context);Date date = new Date(time);return dateFormat.format(date) + " " + timeFormat.format(date);}public static void updateActionModeTitle(ActionMode mode, Context context,int selectedNum) {if (mode != null) {mode.setTitle(context.getString(R.string.multi_select_title,selectedNum));if (selectedNum == 0) {mode.finish();}}}//MimeTypepublic static HashSet<String> sDocMimeTypesSet = new HashSet<String>() {{add("text/plain");add("text/plain");add("application/pdf");add("application/msword");add("application/vnd.ms-excel");add("application/vnd.ms-excel");}};public static String sZipFileMimeType = "application/zip";public static int CATEGORY_TAB_INDEX = 0;public static int SDCARD_TAB_INDEX = 1;
}

遇到一个奇怪的问题，为了验证某个函数，写了个main函数执行，结果发生了奇葩事项~

在Java环境下的工程中执行以下代码，正常输出。

public class Test {public static void main(String[] args) {System.out.println(getNameFromFilename("C:/a/b/c.png"));}public static String getNameFromFilename(String filename) {int dotPosition = filename.lastIndexOf('.');if (dotPosition != -1) {return filename.substring(0, dotPosition);}return "";}
}

打印“C:/a/b/c”

在Android环境下的工程中，竟然直接把JVM搞崩溃了，不明所以啊~
Invalid layout of java.lang.String at value
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (javaClasses.cpp:129), pid=8236, tid=3188
#  fatal error: Invalid layout of preloaded class
#
# JRE version: 7.0_17-b02
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.7-b01 mixed mode windows-amd64 compressed oops)
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# J:\AndroidCenter\MiCodeFileExplorer\hs_err_pid8236.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
#