package com.jwzhangjie.andbase.util;
import java.io.File;
import java.io.FileFilter;
import java.net.URISyntaxException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.MediaStore.Audio;
import android.provider.MediaStore.Video;
import android.util.Log;
/**
* title: FileUtils.java
* @author jwzhangjie
* Date: 2014-12-7 下午10:34:51
* version 1.0
* {@link http://blog.csdn.net/jwzhangjie}
* Description:
*/
public class FileUtils {
/** TAG for log messages. */
static final String TAG = "FileUtils";
private static final boolean DEBUG = false; // Set to true to enable logging
public static final String MIME_TYPE_AUDIO = "audio/*";
public static final String MIME_TYPE_TEXT = "text/*";
public static final String MIME_TYPE_IMAGE = "image/*";
public static final String MIME_TYPE_VIDEO = "video/*";
public static final String MIME_TYPE_APP = "application/*";
/**
* Whether the filename is a video file.
*
* @param filename
* @return
*/
/*
* public static boolean isVideo(String filename) { String mimeType =
* getMimeType(filename); if (mimeType != null &&
* mimeType.startsWith("video/")) { return true; } else { return false; } }
*/
/**
* Whether the URI is a local one.
*
* @param uri
* @return
*/
public static boolean isLocal(String uri) {
if (uri != null && !uri.startsWith("http://")) {
return true;
}
return false;
}
/**
* Gets the extension of a file name, like ".png" or ".jpg".
*
* @param uri
* @return Extension including the dot("."); "" if there is no extension;
* null if uri was null.
*/
public static String getExtension(String uri) {
if (uri == null) {
return null;
}
int dot = uri.lastIndexOf(".");
if (dot >= 0) {
return uri.substring(dot);
} else {
// No extension.
return "";
}
}
/**
* Returns true if uri is a media uri.
*
* @param uri
* @return
*/
public static boolean isMediaUri(Uri uri) {
String uriString = uri.toString();
if (uriString.startsWith(Audio.Media.INTERNAL_CONTENT_URI.toString())
|| uriString.startsWith(Audio.Media.EXTERNAL_CONTENT_URI
.toString())
|| uriString.startsWith(Video.Media.INTERNAL_CONTENT_URI
.toString())
|| uriString.startsWith(Video.Media.EXTERNAL_CONTENT_URI
.toString())) {
return true;
} else {
return false;
}
}
/**
* Convert File into Uri.
*
* @param file
* @return uri
*/
public static Uri getUri(File file) {
if (file != null) {
return Uri.fromFile(file);
}
return null;
}
/**
* Convert Uri into File.
*
* @param uri
* @return file
*/
public static File getFile(Uri uri) {
if (uri != null) {
String filepath = uri.getPath();
if (filepath != null) {
return new File(filepath);
}
}
return null;
}
/**
* Returns the path only (without file name).
*
* @param file
* @return
*/
public static File getPathWithoutFilename(File file) {
if (file != null) {
if (file.isDirectory()) {
// no file to be split off. Return everything
return file;
} else {
String filename = file.getName();
String filepath = file.getAbsolutePath();
// Construct path without file name.
String pathwithoutname = filepath.substring(0,
filepath.length() - filename.length());
if (pathwithoutname.endsWith("/")) {
pathwithoutname = pathwithoutname.substring(0,
pathwithoutname.length() - 1);
}
return new File(pathwithoutname);
}
}
return null;
}
/**
* Constructs a file from a path and file name.
*
* @param curdir
* @param file
* @return
*/
public static File getFile(String curdir, String file) {
String separator = "/";
if (curdir.endsWith("/")) {
separator = "";
}
File clickedFile = new File(curdir + separator + file);
return clickedFile;
}
public static File getFile(File curdir, String file) {
return getFile(curdir.getAbsolutePath(), file);
}
/**
* Get a file path from a Uri.
*
* @param context
* @param uri
* @return
* @throws java.net.URISyntaxException
*
* @author paulburke
*/
public static String getPath(Context context, Uri uri)
throws URISyntaxException {
if (DEBUG)
Log.d(TAG + " File -",
"Authority: " + uri.getAuthority() + ", Fragment: "
+ uri.getFragment() + ", Port: " + uri.getPort()
+ ", Query: " + uri.getQuery() + ", Scheme: "
+ uri.getScheme() + ", Host: " + uri.getHost()
+ ", Segments: " + uri.getPathSegments().toString());
if ("content".equalsIgnoreCase(uri.getScheme())) {
String[] projection = { "_data" };
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, projection,
null, null, null);
int column_index = cursor.getColumnIndexOrThrow("_data");
if (cursor.moveToFirst()) {
return cursor.getString(column_index);
}
} catch (Exception e) {
// Eat it
}
}
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
public static String getFilenameFromUri(Context context, Uri uri) {
String fileName = "";
String scheme = uri.getScheme();
if (scheme.equals("file")) {
fileName = uri.getLastPathSegment();
} else if (scheme.equals("content")) {
String[] proj = { MediaStore.Images.Media.DATA,
MediaStore.Images.Media.DISPLAY_NAME };
Cursor cursor = context.getContentResolver().query(uri, proj, null,
null, null);
if (cursor != null && cursor.getCount() != 0) {
// http://developer.android.com/reference/android/provider/MediaStore.Images.Media.html
int columnIndex = 0;
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
fileName = cursor.getString(columnIndex);
cursor.close();
}
}
return fileName;
}
/**
* Get the file size in a human-readable string.
*
* @param size
* @return
*
* @author paulburke
*/
public static String getReadableFileSize(int size) {
final int BYTES_IN_KILOBYTES = 1024;
final DecimalFormat dec = new DecimalFormat("###.#");
final String KILOBYTES = " KB";
final String MEGABYTES = " MB";
final String GIGABYTES = " GB";
float fileSize = 0;
String suffix = KILOBYTES;
if (size > BYTES_IN_KILOBYTES) {
fileSize = size / BYTES_IN_KILOBYTES;
if (fileSize > BYTES_IN_KILOBYTES) {
fileSize = fileSize / BYTES_IN_KILOBYTES;
if (fileSize > BYTES_IN_KILOBYTES) {
fileSize = fileSize / BYTES_IN_KILOBYTES;
suffix = GIGABYTES;
} else {
suffix = MEGABYTES;
}
}
}
return String.valueOf(dec.format(fileSize) + suffix);
}
/**
* Attempt to retrieve the thumbnail of given Uri from the MediaStore.
*
* This should not be called on the UI thread.
*
* @param context
* @param uri
* @param mimeType
* @return
*
* @author paulburke
*/
public static Bitmap getThumbnail(Context context, Uri uri, String mimeType) {
if (DEBUG)
Log.d(TAG, "Attempting to get thumbnail");
if (isMediaUri(uri)) {
Log.e(TAG,
"You can only retrieve thumbnails for images and videos.");
return null;
}
Bitmap bm = null;
if (uri != null) {
final ContentResolver resolver = context.getContentResolver();
Cursor cursor = null;
try {
cursor = resolver.query(uri, null, null, null, null);
if (cursor.moveToFirst()) {
final int id = cursor.getInt(0);
if (DEBUG)
Log.d(TAG, "Got thumb ID: " + id);
if (mimeType.contains("video")) {
bm = Video.Thumbnails.getThumbnail(resolver, id,
Video.Thumbnails.MINI_KIND, null);
} else if (mimeType.contains(FileUtils.MIME_TYPE_IMAGE)) {
bm = MediaStore.Images.Thumbnails.getThumbnail(
resolver, id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
}
}
} catch (Exception e) {
if (DEBUG)
Log.e(TAG, "getThumbnail", e);
} finally {
if (cursor != null)
cursor.close();
}
}
return bm;
}
private static final String HIDDEN_PREFIX = ".";
/**
* File and folder comparator. Expose sorting option method
*
* @author paulburke
*/
private static Comparator<File> mComparator = new Comparator<File>() {
public int compare(File f1, File f2) {
// Sort alphabetically by lower case, which is much cleaner
return f1.getName().toLowerCase()
.compareTo(f2.getName().toLowerCase());
}
};
/**
* File (not directories) filter.
*
* @author paulburke
*/
private static FileFilter mFileFilter = new FileFilter() {
public boolean accept(File file) {
final String fileName = file.getName();
// Return files only (not directories) and skip hidden files
return file.isFile() && !fileName.startsWith(HIDDEN_PREFIX);
}
};
/**
* Folder (directories) filter.
*
* @author paulburke
*/
private static FileFilter mDirFilter = new FileFilter() {
public boolean accept(File file) {
final String fileName = file.getName();
// Return directories only and skip hidden directories
return file.isDirectory() && !fileName.startsWith(HIDDEN_PREFIX);
}
};
/**
* Get a list of Files in the give path
*
* @param path
* @return Collection of files in give directory
*
* @author paulburke
*/
public static List<File> getFileList(String path) {
ArrayList<File> list = new ArrayList<File>();
// Current directory File instance
final File pathDir = new File(path);
// List file in this directory with the directory filter
final File[] dirs = pathDir.listFiles(mDirFilter);
if (dirs != null) {
// Sort the folders alphabetically
Arrays.sort(dirs, mComparator);
// Add each folder to the File list for the list adapter
for (File dir : dirs)
list.add(dir);
}
// List file in this directory with the file filter
final File[] files = pathDir.listFiles(mFileFilter);
if (files != null) {
// Sort the files alphabetically
Arrays.sort(files, mComparator);
// Add each file to the File list for the list adapter
for (File file : files)
list.add(file);
}
return list;
}
/**
* Get the Intent for selecting content to be used in an Intent Chooser.
*
* @return The intent for opening a file with Intent.createChooser()
*
* @author paulburke
*/
public static Intent createGetContentIntent() {
// Implicitly allow the user to select a particular kind of data
final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// The MIME data type filter
intent.setType("*/*");
// Only return URIs that can be opened with ContentResolver
intent.addCategory(Intent.CATEGORY_OPENABLE);
return intent;
}
public static String getPath(Uri uri, Context context) {
String[] proj = { MediaStore.Images.Media.DATA };
ContentResolver cr = context.getContentResolver();
Cursor cursor = cr.query(uri, proj, null, null, null);
cursor.moveToFirst();
int actual_image_column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
return cursor.getString(actual_image_column_index);
}
}
