文件管理器源码分析(五)

时间:2021-09-11 14:55:34
/**
* 这个文件夹里储的内容是app2sd产生的文件夹,也就是是你手机上所安装到SD的应用程序的缓存文件夹。
* androidsecure文件可以删除吗?
*如果删除之后,软件不能正常使用,和系统没关系。
*话除能导致移sd损坏,数据丢失,并不会造成什么严重后果。
* 只要把移sd损坏程,重装,手机就完全没损伤,文件夹也会在再次app2sd时自重建
*/
public class Util {
private static String ANDROID_SECURE = "/mnt/sdcard/.android_secure";
private static final String LOG_TAG = "Util";
//SD态,mounted”表示
public static boolean isSDCardReady() {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
}
// if path1 contains path2
public 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个路径加的需要加文件分隔符
public static String makePath(String path1, String path2) {
if (path1.endsWith(File.separator))
return path1 + path2;
return path1 + File.separator + path2;
}
//SD
public static String getSdDirectory() {
return Environment.getExternalStorageDirectory().getPath();
}
//判断1个文件是普通文件ANDROID_SECURE下的文件不是普通
public static boolean isNormalFile(String fullName) {
return !fullName.equals(ANDROID_SECURE);
}
//根据文件路径,获Java文件File再包装成FileInfo
public 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FileFilenameFilter项,获得包装FileInfo
//需要注意多少如果File是个Count当前目录下的文件的个数。如果普通文件文件大小。
//这个知道Count字段义了
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 dir
if (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APK标,之前是因为android中存在BUG,
* appInfo.publicSourceDir = apkPath;修正这个问题,详情参:
* http://code.google.com/p/android/issues/detail?id=9151
*/
public static Drawable getApkIcon(Context context, String apkPath) {
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;
}
//文件的
public static String getExtFromFilename(String filename) {
int dotPosition = filename.lastIndexOf('.');
if (dotPosition != -1) {
return filename.substring(dotPosition + 1, filename.length());
}
return "";
}
//得去掉文件的文件名比如C:/a/b/c.png”,输C:/a/b/c”
public static String getNameFromFilename(String filename) {
int dotPosition = filename.lastIndexOf('.');
if (dotPosition != -1) {
return filename.substring(0, dotPosition);
}
return "";
}
//文件路径,获路径
public static String getPathFromFilepath(String filepath) {
int pos = filepath.lastIndexOf('/');
if (pos != -1) {
return filepath.substring(0, pos);
}
return "";
}
//文件路径,获文件名(带缀,如果
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 null
public 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 privilege
return 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 folder
private static String[] SysFileDirs = new String[] {
"miren_browser/imagecaches"
};
//判断一个文件是需要根据Setting的设置。特别说文件示。
public static boolean shouldShowFile(String path) {
return shouldShowFile(new File(path));
}
//判断一个文件是需要根据Setting的设置。特别说文件示。
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;
}
//根据下文对Context,获默认的收藏集合
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;
}
//ViewTextView设置文
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;
}
//ViewTextView设置文
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 number
public static String convertNumber(long number) {
return String.format("%,d", number);
}
// storage, G M K B
public 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);
} else
return String.format("%d B", size);
}
public static class SDCardInfo {
public long total;
public long free;
}
//SD的各种信息,总量大小和剩余量大小等
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());
// SDCardBLOCK
long nTotalBlocks = statfs.getBlockCount();
// SDCardblockSIZE
long nBlocSize = statfs.getBlockSize();
// 供程使用Block的数
long nAvailaBlock = statfs.getAvailableBlocks();
// 取剩下的Block的数(包括一般程使用)
long nFreeBlock = statfs.getFreeBlocks();
SDCardInfo info = new SDCardInfo();
// SDCard 量大小MB
info.total = nTotalBlocks * nBlocSize;
// SDCard 剩余大小MB
info.free = nAvailaBlock * nBlocSize;
return info;
} catch (IllegalArgumentException e) {
Log.e(LOG_TAG, e.toString());
}
}
return null;
}
//示一通知
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 disabled
intent = new Intent(context, FileViewActivity.class);
}
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_ONE_SHOT);
manager.notify(drawableId, notification);
}
//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();
}
}
}
//sDocMimeTypesSet查詢條件是
public 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");
}
};
//对于压缩文件Zip的查詢條件是
public static String sZipFileMimeType = "application/zip";
public static int CATEGORY_TAB_INDEX = 0;
public static int SDCARD_TAB_INDEX = 1;
}