小米开源文件管理器MiCodeFileExplorer-源码研究(4)-文件操作工具类FileOperationHelper

文件操作是非常通用的，注释都写在源代码中了，不多说~
需要特别说明的是，任务的异步执行和IOperationProgressListener。
拷贝和删除等操作，是比较费时的，采用了异步执行的方式~


Android异步执行，我也是初次了解，在CSDN上找了一篇文章，后续写个单独的例子，单独写1篇介绍。
http://blog.csdn.net/xufenghappy6/article/details/7343899
异步执行+事件通知 是一种比较流行的模式，比同步等待很多时候要好。


另外，特别需要说明的是，Java应用程序中、Android、Windows开发、Linux Shell都会有文件File的概念，他们本质是一样的。
文件的核心概念基本一致，都是用的操作系统的文件概念，不同操作系统之间的区别也不大。
创建、删除、重命名、复制、粘贴，输入-执行-输出，也都一样。

package net.micode.fileexplorer.util;import java.io.File;import java.io.FilenameFilter;import java.util.ArrayList;import net.micode.fileexplorer.model.FileInfo;import android.os.AsyncTask;import android.os.Environment;import android.text.TextUtils;import android.util.Log;/**文件操作工具类，执行文件的创建、移动、粘贴、重命名、删除等*/public class FileOperationHelper {private static final String LOG_TAG = "FileOperation";    //内部文件集合，用来临时保存复制、移动等操作，用户选择的文件集合private ArrayList<FileInfo> mCurFileNameList = new ArrayList<FileInfo>();private boolean mMoving;private IOperationProgressListener mOperationListener;private FilenameFilter mFilter;public interface IOperationProgressListener {void onFinish();void onFileChanged(String path);}public FileOperationHelper(IOperationProgressListener l) {mOperationListener = l;}public void setFilenameFilter(FilenameFilter f) {mFilter = f;}//根据路径和文件名，创建文件public boolean CreateFolder(String path, String name) {Log.v(LOG_TAG, "CreateFolder >>> " + path + "," + name);File f = new File(Util.makePath(path, name));if (f.exists())return false;return f.mkdir();}//拷贝若干个文件，把文件集合拷贝到“当前文件集合中mCurFileNameList”，可以供“粘贴操作”使用public void Copy(ArrayList<FileInfo> files) {copyFileList(files);}//粘贴，把当前文件集合中“mCurFileNameList”的文件，拷贝到目标路径下public boolean Paste(String path) {if (mCurFileNameList.size() == 0)return false;final String _path = path;//异步执行某个任务asnycExecute(new Runnable() {@Overridepublic void run() {for (FileInfo f : mCurFileNameList) {CopyFile(f, _path);}//通知操作变化mOperationListener.onFileChanged(Environment.getExternalStorageDirectory().getAbsolutePath());                //粘贴之后，需要清空mCurFileNameListclear();}});return true;}//是否可以“粘贴”，mCurFileNameList有元素public boolean canPaste() {return mCurFileNameList.size() != 0;}//开始移动，标记“正在移动”，拷贝文件集合public void StartMove(ArrayList<FileInfo> files) {if (mMoving)return;mMoving = true;copyFileList(files);}//移动状态public boolean isMoveState() {return mMoving;}//能否移动，假设path为“C:/a/b”,f.filePath为“C:、/a/b/c/d.png”,不能移动//TODO 感觉不太靠谱啊，为啥不能移动到文件的上级目录呢？public boolean canMove(String path) {for (FileInfo f : mCurFileNameList) {if (!f.IsDir)continue;if (Util.containsPath(f.filePath, path))return false;}return true;}//清空当前文件集合public void clear() {synchronized (mCurFileNameList) {mCurFileNameList.clear();}}//停止移动，移动文件是异步执行，结束后有事件通知public boolean EndMove(String path) {if (!mMoving)return false;mMoving = false;if (TextUtils.isEmpty(path))return false;final String _path = path;asnycExecute(new Runnable() {@Overridepublic void run() {for (FileInfo f : mCurFileNameList) {MoveFile(f, _path);}mOperationListener.onFileChanged(Environment.getExternalStorageDirectory().getAbsolutePath());clear();}});return true;}public ArrayList<FileInfo> getFileList() {return mCurFileNameList;}//异步执行某个任务//android的类AsyncTask对线程间通讯进行了包装，提供了简易的编程方式来使后台线程和UI线程进行通讯：后台线程执行异步任务，并把操作结果通知UI线程。//可以参考http://blog.csdn.net/xufenghappy6/article/details/7343899private void asnycExecute(Runnable r) {final Runnable _r = r;new AsyncTask() {@Overrideprotected Object doInBackground(Object... params) {synchronized (mCurFileNameList) {_r.run();}if (mOperationListener != null) {mOperationListener.onFinish();}return null;}}.execute();}//某个路径是否被选中public boolean isFileSelected(String path) {synchronized (mCurFileNameList) {for (FileInfo f : mCurFileNameList) {if (f.filePath.equalsIgnoreCase(path))return true;}}return false;}//文件重命名public boolean Rename(FileInfo f, String newName) {if (f == null || newName == null) {Log.e(LOG_TAG, "Rename: null parameter");return false;}File file = new File(f.filePath);String newPath = Util.makePath(Util.getPathFromFilepath(f.filePath),newName);final boolean needScan = file.isFile();try {boolean ret = file.renameTo(new File(newPath));if (ret) {if (needScan) {mOperationListener.onFileChanged(f.filePath);}mOperationListener.onFileChanged(newPath);}return ret;} catch (SecurityException e) {Log.e(LOG_TAG, "Fail to rename file," + e.toString());}return false;}//删除若干文件，先copy文件集合，再异步执行删除操作，删除完成后，有通知public boolean Delete(ArrayList<FileInfo> files) {copyFileList(files);asnycExecute(new Runnable() {@Overridepublic void run() {for (FileInfo f : mCurFileNameList) {DeleteFile(f);}mOperationListener.onFileChanged(Environment.getExternalStorageDirectory().getAbsolutePath());clear();}});return true;}//删除1个文件protected void DeleteFile(FileInfo f) {if (f == null) {Log.e(LOG_TAG, "DeleteFile: null parameter");return;}File file = new File(f.filePath);boolean directory = file.isDirectory();if (directory) {for (File child : file.listFiles(mFilter)) {if (Util.isNormalFile(child.getAbsolutePath())) {DeleteFile(Util.GetFileInfo(child, mFilter, true));}}}file.delete();Log.v(LOG_TAG, "DeleteFile >>> " + f.filePath);}//执行1个文件的拷贝，如果文件是目录，拷贝整个目录，可能有递归Copyprivate void CopyFile(FileInfo f, String dest) {if (f == null || dest == null) {Log.e(LOG_TAG, "CopyFile: null parameter");return;}File file = new File(f.filePath);if (file.isDirectory()) {// directory exists in destination, rename itString destPath = Util.makePath(dest, f.fileName);File destFile = new File(destPath);int i = 1;while (destFile.exists()) {destPath = Util.makePath(dest, f.fileName + " " + i++);destFile = new File(destPath);}for (File child : file.listFiles(mFilter)) {if (!child.isHidden()&& Util.isNormalFile(child.getAbsolutePath())) {CopyFile(Util.GetFileInfo(child, mFilter, Settings.instance().getShowDotAndHiddenFiles()), destPath);}}} else {String destFile = Util.copyFile(f.filePath, dest);}Log.v(LOG_TAG, "CopyFile >>> " + f.filePath + "," + dest);}//移动文件，通过重命名的方式，移动的private boolean MoveFile(FileInfo f, String dest) {Log.v(LOG_TAG, "MoveFile >>> " + f.filePath + "," + dest);if (f == null || dest == null) {Log.e(LOG_TAG, "CopyFile: null parameter");return false;}File file = new File(f.filePath);String newPath = Util.makePath(dest, f.fileName);try {return file.renameTo(new File(newPath));} catch (SecurityException e) {Log.e(LOG_TAG, "Fail to move file," + e.toString());}return false;}//把文件集合copy到mCurFileNameList中，同步~private void copyFileList(ArrayList<FileInfo> files) {synchronized (mCurFileNameList) {mCurFileNameList.clear();for (FileInfo f : files) {mCurFileNameList.add(f);}}}}