/*
* Copyright (C) 2012 www.amsoft.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ab.util;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Comparator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.Environment;
import android.os.StatFs;
import com.ab.global.AbAppConfig;
// TODO: Auto-generated Javadoc
/**
* © 2012 amsoft.cn
* 名称：AbFileUtil.java
* 描述：文件操作类.
*
* @author 还如一梦中
* @version v1.0
* @date：2013-01-18 下午11:52:13
*/
public class AbFileUtil {
/** 默认APP根目录. */
private static String downloadRootDir = null;
/** 默认下载图片文件目录. */
private static String imageDownloadDir = null;
/** 默认下载文件目录. */
private static String fileDownloadDir = null;
/** 默认缓存目录. */
private static String cacheDownloadDir = null;
/** 默认下载数据库文件的目录. */
private static String dbDownloadDir = null;
/** 剩余空间大于200M才使用SD缓存. */
private static int freeSdSpaceNeededToCache = 200*1024*1024;
/**
* 描述：通过文件的本地地址从SD卡读取图片.
*
* @param file the file
* @param type 图片的处理类型（剪切或者缩放到指定大小，参考AbConstant类）
* 如果设置为原图，则后边参数无效，得到原图
* @param desiredWidth 新图片的宽
* @param desiredHeight 新图片的高
* @return Bitmap 新图片
*/
public static Bitmap getBitmapFromSD(File file,int type,int desiredWidth, int desiredHeight){
Bitmap bitmap = null;
try {
//SD卡是否存在
if(!isCanUseSD()){
return null;
}
//文件是否存在
if(!file.exists()){
return null;
}
//文件存在
if(type == AbImageUtil.CUTIMG){
bitmap = AbImageUtil.getCutBitmap(file,desiredWidth,desiredHeight);
}else if(type == AbImageUtil.SCALEIMG){
bitmap = AbImageUtil.getScaleBitmap(file,desiredWidth,desiredHeight);
}else{
bitmap = AbImageUtil.getBitmap(file);
}
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
/**
* 描述：通过文件的本地地址从SD卡读取图片.
*
* @param file the file
* @return Bitmap 图片
*/
public static Bitmap getBitmapFromSD(File file){
Bitmap bitmap = null;
try {
//SD卡是否存在
if(!isCanUseSD()){
return null;
}
//文件是否存在
if(!file.exists()){
return null;
}
//文件存在
bitmap = AbImageUtil.getBitmap(file);
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
/**
* 描述：将图片的byte[]写入本地文件.
* @param imgByte 图片的byte[]形势
* @param fileName 文件名称，需要包含后缀，如.jpg
* @param type 图片的处理类型（剪切或者缩放到指定大小，参考AbConstant类）
* @param desiredWidth 新图片的宽
* @param desiredHeight 新图片的高
* @return Bitmap 新图片
*/
public static Bitmap getBitmapFromByte(byte[] imgByte,String fileName,int type,int desiredWidth, int desiredHeight){
FileOutputStream fos = null;
DataInputStream dis = null;
ByteArrayInputStream bis = null;
Bitmap bitmap = null;
File file = null;
try {
if(imgByte!=null){
file = new File(imageDownloadDir+fileName);
if(!file.exists()){
file.createNewFile();
}
fos = new FileOutputStream(file);
int readLength = 0;
bis = new ByteArrayInputStream(imgByte);
dis = new DataInputStream(bis);
byte[] buffer = new byte[1024];
while ((readLength = dis.read(buffer))!=-1) {
fos.write(buffer, 0, readLength);
try {
Thread.sleep(500);
} catch (Exception e) {
}
}
fos.flush();
bitmap = getBitmapFromSD(file,type,desiredWidth,desiredHeight);
}
} catch (Exception e) {
e.printStackTrace();
}finally{
if(dis!=null){
try {
dis.close();
} catch (Exception e) {
}
}
if(bis!=null){
try {
bis.close();
} catch (Exception e) {
}
}
if(fos!=null){
try {
fos.close();
} catch (Exception e) {
}
}
}
return bitmap;
}
/**
* 描述：根据URL从互连网获取图片.
* @param url 要下载文件的网络地址
* @param desiredWidth 新图片的宽
* @param desiredHeight 新图片的高
* @return Bitmap 新图片
*/
public static Bitmap getBitmapFromURL(String url,int desiredWidth, int desiredHeight){
Bitmap bitmap = null;
try {
bitmap = AbImageUtil.getBitmap(url,desiredWidth,desiredHeight);
} catch (Exception e) {
AbLogUtil.d(AbFileUtil.class, "下载图片异常："+e.getMessage());
}
return bitmap;
}
/**
* 描述：获取src中的图片资源.
*
* @param src 图片的src路径，如（“image/arrow.png”）
* @return Bitmap 图片
*/
public static Bitmap getBitmapFromSrc(String src){
Bitmap bit = null;
try {
bit = BitmapFactory.decodeStream(AbFileUtil.class.getResourceAsStream(src));
} catch (Exception e) {
AbLogUtil.d(AbFileUtil.class, "获取图片异常："+e.getMessage());
}
return bit;
}
/**
* 描述：获取Asset中的图片资源.
*
* @param context the context
* @param fileName the file name
* @return Bitmap 图片
*/
public static Bitmap getBitmapFromAsset(Context context,String fileName){
Bitmap bit = null;
try {
AssetManager assetManager = context.getAssets();
InputStream is = assetManager.open(fileName);
bit = BitmapFactory.decodeStream(is);
} catch (Exception e) {
AbLogUtil.d(AbFileUtil.class, "获取图片异常："+e.getMessage());
}
return bit;
}
/**
* 描述：获取Asset中的图片资源.
*
* @param context the context
* @param fileName the file name
* @return Drawable 图片
*/
public static Drawable getDrawableFromAsset(Context context,String fileName){
Drawable drawable = null;
try {
AssetManager assetManager = context.getAssets();
InputStream is = assetManager.open(fileName);
drawable = Drawable.createFromStream(is,null);
} catch (Exception e) {
AbLogUtil.d(AbFileUtil.class, "获取图片异常："+e.getMessage());
}
return drawable;
}
/**
* 下载网络文件到SD卡中.如果SD中存在同名文件将不再下载
*
* @param url 要下载文件的网络地址
* @param dirPath 文件路径
* @return 下载好的本地文件地址
*/
public static String downloadFile(String url,String dirPath){
InputStream in = null;
FileOutputStream fileOutputStream = null;
HttpURLConnection connection = null;
String downFilePath = null;
File file = null;
try {
if(!isCanUseSD()){
return null;
}
//先判断SD卡中有没有这个文件，不比较后缀部分比较
String fileNameNoMIME = getCacheFileNameFromUrl(url);
File parentFile = new File(dirPath);
if(!parentFile.exists()){
parentFile.mkdirs();
}
File[] files = parentFile.listFiles();
if(files!=null){
for(int i = 0; i < files.length; ++i){
String fileName = files[i].getName();
String name = fileName.substring(0,fileName.lastIndexOf("."));
if(name.equals(fileNameNoMIME)){
//文件已存在
return files[i].getPath();
}
}
}
URL mUrl = new URL(url);
connection = (HttpURLConnection)mUrl.openConnection();
connection.connect();
//获取文件名，下载文件
String fileName = getCacheFileNameFromUrl(url,connection);
file = new File(dirPath,fileName);
downFilePath = file.getPath();
if(!file.exists()){
file.createNewFile();
}else{
//文件已存在
return file.getPath();
}
in = connection.getInputStream();
fileOutputStream = new FileOutputStream(file);
byte[] b = new byte[1024];
int temp = 0;
while((temp=in.read(b))!=-1){
fileOutputStream.write(b, 0, temp);
}
}catch(Exception e){
e.printStackTrace();
AbLogUtil.e(AbFileUtil.class, "有文件下载出错了,已删除");
//检查文件大小,如果文件为0B说明网络不好没有下载成功，要将建立的空文件删除
if(file != null){
file.delete();
}
file = null;
downFilePath = null;
}finally{
try {
if(in!=null){
in.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if(fileOutputStream!=null){
fileOutputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if(connection!=null){
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return downFilePath;
}
/**
* 描述：获取网络文件的大小.
*
* @param Url 图片的网络路径
* @return int 网络文件的大小
*/
public static int getContentLengthFromUrl(String Url){
int mContentLength = 0;
try {
URL url = new URL(Url);
HttpURLConnection mHttpURLConnection = (HttpURLConnection) url.openConnection();
mHttpURLConnection.setConnectTimeout(5 * 1000);
mHttpURLConnection.setRequestMethod("GET");
mHttpURLConnection.setRequestProperty("Accept","image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
mHttpURLConnection.setRequestProperty("Accept-Language", "zh-CN");
mHttpURLConnection.setRequestProperty("Referer", Url);
mHttpURLConnection.setRequestProperty("Charset", "UTF-8");
mHttpURLConnection.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
mHttpURLConnection.setRequestProperty("Connection", "Keep-Alive");
mHttpURLConnection.connect();
if (mHttpURLConnection.getResponseCode() == 200){
// 根据响应获取文件大小
mContentLength = mHttpURLConnection.getContentLength();
}
} catch (Exception e) {
e.printStackTrace();
AbLogUtil.d(AbFileUtil.class, "获取长度异常："+e.getMessage());
}
return mContentLength;
}
/**
* 获取文件名，通过网络获取.
* @param url 文件地址
* @return 文件名
*/
public static String getRealFileNameFromUrl(String url){
String name = null;
try {
if(AbStrUtil.isEmpty(url)){
return name;
}
URL mUrl = new URL(url);
HttpURLConnection mHttpURLConnection = (HttpURLConnection) mUrl.openConnection();
mHttpURLConnection.setConnectTimeout(5 * 1000);
mHttpURLConnection.setRequestMethod("GET");
mHttpURLConnection.setRequestProperty("Accept","image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
mHttpURLConnection.setRequestProperty("Accept-Language", "zh-CN");
mHttpURLConnection.setRequestProperty("Referer", url);
mHttpURLConnection.setRequestProperty("Charset", "UTF-8");
mHttpURLConnection.setRequestProperty("User-Agent","");
mHttpURLConnection.setRequestProperty("Connection", "Keep-Alive");
mHttpURLConnection.connect();
if (mHttpURLConnection.getResponseCode() == 200){
for (int i = 0;; i++) {
String mine = mHttpURLConnection.getHeaderField(i);
if (mine == null){
break;
}
if ("content-disposition".equals(mHttpURLConnection.getHeaderFieldKey(i).toLowerCase())) {
Matcher m = Pattern.compile(".*filename=(.*)").matcher(mine.toLowerCase());
if (m.find())
return m.group(1).replace("\"", "");
}
}
}
} catch (Exception e) {
e.printStackTrace();
AbLogUtil.e(AbFileUtil.class, "网络上获取文件名失败");
}
return name;
}
/**
* 获取真实文件名（xx.后缀），通过网络获取.
* @param connection 连接
* @return 文件名
*/
public static String getRealFileName(HttpURLConnection connection){
String name = null;
try {
if(connection == null){
return name;
}
if (connection.getResponseCode() == 200){
for (int i = 0;; i++) {
String mime = connection.getHeaderField(i);
if (mime == null){
break;
}
// "Content-Disposition","attachment; filename=1.txt"
// Content-Length
if ("content-disposition".equals(connection.getHeaderFieldKey(i).toLowerCase())) {
Matcher m = Pattern.compile(".*filename=(.*)").matcher(mime.toLowerCase());
if (m.find()){
return m.group(1).replace("\"", "");
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
AbLogUtil.e(AbFileUtil.class, "网络上获取文件名失败");
}
return name;
}
/**
* 获取真实文件名（xx.后缀），通过网络获取.
*
* @param response the response
* @return 文件名
*/
public static String getRealFileName(HttpResponse response){
String name = null;
try {
if(response == null){
return name;
}
//获取文件名
Header[] headers = response.getHeaders("content-disposition");
for(int i=0;i<headers.length;i++){
Matcher m = Pattern.compile(".*filename=(.*)").matcher(headers[i].getValue());
if (m.find()){
name = m.group(1).replace("\"", "");
}
}
} catch (Exception e) {
e.printStackTrace();
AbLogUtil.e(AbFileUtil.class, "网络上获取文件名失败");
}
return name;
}
/**
* 获取文件名（不含后缀）.
*
* @param url 文件地址
* @return 文件名
*/
public static String getCacheFileNameFromUrl(String url){
if(AbStrUtil.isEmpty(url)){
return null;
}
String name = null;
try {
name = AbMd5.MD5(url);
} catch (Exception e) {
e.printStackTrace();
}
return name;
}
/**
* 获取文件名（.后缀），外链模式和通过网络获取.
*
* @param url 文件地址
* @param response the response
* @return 文件名
*/
public static String getCacheFileNameFromUrl(String url,HttpResponse response){
if(AbStrUtil.isEmpty(url)){
return null;
}
String name = null;
try {
//获取后缀
String suffix = getMIMEFromUrl(url,response);
if(AbStrUtil.isEmpty(suffix)){
suffix = ".ab";
}
name = AbMd5.MD5(url)+suffix;
} catch (Exception e) {
e.printStackTrace();
}
return name;
}
/**
* 获取文件名（.后缀），外链模式和通过网络获取.
*
* @param url 文件地址
* @param connection the connection
* @return 文件名
*/
public static String getCacheFileNameFromUrl(String url,HttpURLConnection connection){
if(AbStrUtil.isEmpty(url)){
return null;
}
String name = null;
try {
//获取后缀
String suffix = getMIMEFromUrl(url,connection);
if(AbStrUtil.isEmpty(suffix)){
suffix = ".ab";
}
name = AbMd5.MD5(url)+suffix;
} catch (Exception e) {
e.printStackTrace();
}
return name;
}
/**
* 获取文件后缀，本地.
*
* @param url 文件地址
* @param connection the connection
* @return 文件后缀
*/
public static String getMIMEFromUrl(String url,HttpURLConnection connection){
if(AbStrUtil.isEmpty(url)){
return null;
}
String suffix = null;
try {
//获取后缀
if(url.lastIndexOf(".")!=-1){
suffix = url.substring(url.lastIndexOf("."));
if(suffix.indexOf("/")!=-1 || suffix.indexOf("?")!=-1 || suffix.indexOf("&")!=-1){
suffix = null;
}
}
if(AbStrUtil.isEmpty(suffix)){
//获取文件名 这个效率不高
String fileName = getRealFileName(connection);
if(fileName!=null && fileName.lastIndexOf(".")!=-1){
suffix = fileName.substring(fileName.lastIndexOf("."));
}
}
} catch (Exception e) {
e.printStackTrace();
}
return suffix;
}
/**
* 获取文件后缀，本地和网络.
*
* @param url 文件地址
* @param response the response
* @return 文件后缀
*/
public static String getMIMEFromUrl(String url,HttpResponse response){
if(AbStrUtil.isEmpty(url)){
return null;
}
String mime = null;
try {
//获取后缀
if(url.lastIndexOf(".")!=-1){
mime = url.substring(url.lastIndexOf("."));
if(mime.indexOf("/")!=-1 || mime.indexOf("?")!=-1 || mime.indexOf("&")!=-1){
mime = null;
}
}
if(AbStrUtil.isEmpty(mime)){
//获取文件名 这个效率不高
String fileName = getRealFileName(response);
if(fileName!=null && fileName.lastIndexOf(".")!=-1){
mime = fileName.substring(fileName.lastIndexOf("."));
}
}
} catch (Exception e) {
e.printStackTrace();
}
return mime;
}
/**
* 描述：从sd卡中的文件读取到byte[].
*
* @param path sd卡中文件路径
* @return byte[]
*/
public static byte[] getByteArrayFromSD(String path) {
byte[] bytes = null;
ByteArrayOutputStream out = null;
try {
File file = new File(path);
//SD卡是否存在
if(!isCanUseSD()){
return null;
}
//文件是否存在
if(!file.exists()){
return null;
}
long fileSize = file.length();
if (fileSize > Integer.MAX_VALUE) {
return null;
}
FileInputStream in = new FileInputStream(path);
out = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int size=0;
while((size=in.read(buffer))!=-1) {
out.write(buffer,0,size);
}
in.close();
bytes = out.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally{
if(out!=null){
try {
out.close();
} catch (Exception e) {
}
}
}
return bytes;
}
/**
* 描述：将byte数组写入文件.
*
* @param path the path
* @param content the content
* @param create the create
*/
public static void writeByteArrayToSD(String path, byte[] content,boolean create){
FileOutputStream fos = null;
try {
File file = new File(path);
//SD卡是否存在
if(!isCanUseSD()){
return;
}
//文件是否存在
if(!file.exists()){
if(create){
File parent = file.getParentFile();
if(!parent.exists()){
parent.mkdirs();
file.createNewFile();
}
}else{
return;
}
}
fos = new FileOutputStream(path);
fos.write(content);
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fos!=null){
try {
fos.close();
} catch (Exception e) {
}
}
}
}
/**
* 将bitmap写入文件.
* @param path
* @param bitmap png
*/
public static void writeBitmapToSD(String path,Bitmap bitmap,boolean create){
FileOutputStream fos = null;
try {
File file = new File(path);
//SD卡是否存在
if(!isCanUseSD()){
return;
}
//文件是否存在
if(!file.exists()){
if(create){
File parent = file.getParentFile();
if(!parent.exists()){
parent.mkdirs();
file.createNewFile();
}
}
}
fos = new FileOutputStream(path);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fos!=null){
try {
fos.close();
} catch (Exception e) {
}
}
}
}
/**
* 拷贝Assets目录内容到sd卡目录
* @param context
* @param assetDir "dir"
* @param outDir 完整sd卡路径
*/
public static void copyAssets2SD(Context context, String assetDir, String outDir) {
String[] files;
try {
files = context.getAssets().list(assetDir);
File outDirFile = new File(outDir);
if (!outDirFile.exists()) {
outDirFile.mkdirs();
}
for (int i = 0; i < files.length; i++) {
String fileName = files[i];
String[] filesChild = context.getAssets().list(fileName);
if (filesChild!=null && filesChild.length>0) {
copyAssets2SD(context, fileName, outDir + "/"+fileName);
} else {
InputStream in = null;
if(!AbStrUtil.isEmpty(assetDir)){
in = context.getAssets().open(assetDir + "/" + fileName);
}else{
in = context.getAssets().open(fileName);
}
File outFile = new File(outDir+"/"+fileName);
if(outFile.exists()){
outFile.delete();
}
outFile.createNewFile();
OutputStream out = new FileOutputStream(outFile);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 描述：SD卡是否能用.
*
* @return true 可用,false不可用
*/
public static boolean isCanUseSD() {
try {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 描述：初始化存储目录.
*
* @param context the context
*/
public static void initFileDir(Context context){
PackageInfo info = AbAppUtil.getPackageInfo(context);
//默认下载文件根目录.
String downloadRootPath = File.separator + AbAppConfig.DOWNLOAD_ROOT_DIR + File.separator + info.packageName + File.separator;
//默认下载图片文件目录.
String imageDownloadPath = downloadRootPath + AbAppConfig.DOWNLOAD_IMAGE_DIR + File.separator;
//默认下载文件目录.
String fileDownloadPath = downloadRootPath + AbAppConfig.DOWNLOAD_FILE_DIR + File.separator;
//默认缓存目录.
String cacheDownloadPath = downloadRootPath + AbAppConfig.CACHE_DIR + File.separator;
//默认DB目录.
String dbDownloadPath = downloadRootPath + AbAppConfig.DB_DIR + File.separator;
try {
if(!isCanUseSD()){
return;
}else{
File root = Environment.getExternalStorageDirectory();
File downloadDir = new File(root.getAbsolutePath() + downloadRootPath);
if(!downloadDir.exists()){
downloadDir.mkdirs();
}
downloadRootDir = downloadDir.getPath();
File cacheDownloadDirFile = new File(root.getAbsolutePath() + cacheDownloadPath);
if(!cacheDownloadDirFile.exists()){
cacheDownloadDirFile.mkdirs();
}
cacheDownloadDir = cacheDownloadDirFile.getPath();
File imageDownloadDirFile = new File(root.getAbsolutePath() + imageDownloadPath);
if(!imageDownloadDirFile.exists()){
imageDownloadDirFile.mkdirs();
}
imageDownloadDir = imageDownloadDirFile.getPath();
File fileDownloadDirFile = new File(root.getAbsolutePath() + fileDownloadPath);
if(!fileDownloadDirFile.exists()){
fileDownloadDirFile.mkdirs();
}
fileDownloadDir = fileDownloadDirFile.getPath();
File dbDownloadDirFile = new File(root.getAbsolutePath() + dbDownloadPath);
if(!dbDownloadDirFile.exists()){
dbDownloadDirFile.mkdirs();
}
dbDownloadDir = dbDownloadDirFile.getPath();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 计算sdcard上的剩余空间.
*
* @return the int
*/
public static int freeSpaceOnSD() {
StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
double sdFreeMB = ((double)stat.getAvailableBlocks() * (double) stat.getBlockSize()) / 1024*1024;
return (int) sdFreeMB;
}
/**
* 根据文件的最后修改时间进行排序.
*/
public static class FileLastModifSort implements Comparator<File> {
/* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(File arg0, File arg1) {
if (arg0.lastModified() > arg1.lastModified()) {
return 1;
} else if (arg0.lastModified() == arg1.lastModified()) {
return 0;
} else {
return -1;
}
}
}
/**
* 删除所有缓存文件.
*
* @return true, if successful
*/
public static boolean clearDownloadFile() {
try {
File fileDirectory = new File(downloadRootDir);
deleteFile(fileDirectory);
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
/**
* 删除文件.
*
* @return true, if successful
*/
public static boolean deleteFile(File file) {
try {
if(!isCanUseSD()){
return false;
}
if (file == null) {
return true;
}
if(file.isDirectory()){
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
deleteFile(files[i]);
}
}else{
file.delete();
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
/**
* 描述：读取Assets目录的文件内容.
*
* @param context the context
* @param name the name
* @param encoding the encoding
* @return the string
*/
public static String readAssetsByName(Context context,String name,String encoding){
String text = null;
InputStreamReader inputReader = null;
BufferedReader bufReader = null;
try {
inputReader = new InputStreamReader(context.getAssets().open(name));
bufReader = new BufferedReader(inputReader);
String line = null;
StringBuffer buffer = new StringBuffer();
while((line = bufReader.readLine()) != null){
buffer.append(line);
}
text = new String(buffer.toString().getBytes(), encoding);
} catch (Exception e) {
e.printStackTrace();
} finally{
try {
if(bufReader!=null){
bufReader.close();
}
if(inputReader!=null){
inputReader.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return text;
}
/**
* 描述：读取Raw目录的文件内容.
*
* @param context the context
* @param id the id
* @param encoding the encoding
* @return the string
*/
public static String readRawByName(Context context,int id,String encoding){
String text = null;
InputStreamReader inputReader = null;
BufferedReader bufReader = null;
try {
inputReader = new InputStreamReader(context.getResources().openRawResource(id));
bufReader = new BufferedReader(inputReader);
String line = null;
StringBuffer buffer = new StringBuffer();
while((line = bufReader.readLine()) != null){
buffer.append(line);
}
text = new String(buffer.toString().getBytes(),encoding);
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
if(bufReader!=null){
bufReader.close();
}
if(inputReader!=null){
inputReader.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return text;
}
/**
* Gets the download root dir.
*
* @param context the context
* @return the download root dir
*/
public static String getDownloadRootDir(Context context) {
if(downloadRootDir == null){
initFileDir(context);
}
return downloadRootDir;
}
/**
* Gets the image download dir.
*
* @param context the context
* @return the image download dir
*/
public static String getImageDownloadDir(Context context) {
if(downloadRootDir == null){
initFileDir(context);
}
return imageDownloadDir;
}
/**
* Gets the file download dir.
*
* @param context the context
* @return the file download dir
*/
public static String getFileDownloadDir(Context context) {
if(downloadRootDir == null){
initFileDir(context);
}
return fileDownloadDir;
}
/**
* Gets the cache download dir.
*
* @param context the context
* @return the cache download dir
*/
public static String getCacheDownloadDir(Context context) {
if(downloadRootDir == null){
initFileDir(context);
}
return cacheDownloadDir;
}
/**
* Gets the db download dir.
*
* @param context the context
* @return the db download dir
*/
public static String getDbDownloadDir(Context context) {
if(downloadRootDir == null){
initFileDir(context);
}
return dbDownloadDir;
}
/**
* Gets the free sd space needed to cache.
*
* @return the free sd space needed to cache
*/
public static int getFreeSdSpaceNeededToCache() {
return freeSdSpaceNeededToCache;
}
}