文件管理器源码分析（二）

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/**
 * 文件操作工具类，执行文件的创建、移动、粘贴、重命名、删除等
 * 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~
 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。
 */
public class FileOperationHelper {
    private static final String LOG_TAG = "FileOperation";
    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() {
            @Override
            public 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mCurFileNameList
                clear();
            }
        });
        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;
    }
    /**
     * 能否移走，假设path是“C:/a/b”,f.filePath是“C:、/a/b/c/d.png”,不能移走
     * 感覺不太靠譜，爲啥不能移動到文件的上層目錄呢？
     * @param path
     * @return
     */
    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() {
            @Override
            public 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/7343899
    private void asnycExecute(Runnable r) {
        final Runnable _r = r;
        new AsyncTask() {
            @Override
            protected 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() {
            @Override
            public 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Copy
    private 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 it
            String 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);
            }
        }
    }
}

文件管理器源码分析（二）

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原文地址：http://blog.csdn.net/jjz_bobo/article/details/51332648